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We demonstrate a passively Q-switched Yb3+/Er3+ co-doped fiber (YEDF) laser using a filmy sodium carboxymethylcellulose (NaCMC)-based Cu1.8S nanocrystals (NCs) saturable absorber (SA). Cu1.8S NCs SA exhibit a broad absorption band from 600 nm to more than 2500 nm. By placing Cu1.8S NCs SA into a YEDF laser cavity, stable passively Q-switched laser with a central wavelength of ∼1567.2 nm was achieved at a threshold pump power of ∼1.4 W. On gradually increasing the pump power from 1.4 W to 5.6 W, the repetition rate of Q-switched laser increases from 16.6 kHz to 51.14 kHz and the pulse duration decreases from 8.7 μs to 2 μs. Particularly, we measure the output power of Q-switched lasers based on two types of plasmonic materials, Cu1.8S NCs and gold nanorods (GNRs). The maximum output power of the Q-switched laser based on Cu1.8S NCs SA is 3–4 times higher than that based on GNRs SA owing to weak photothermal effect of Cu1.8S NCs. These results show that Cu1.8S NCs are promising SAs for constructing high power pulse lasers. [ABSTRACT FROM AUTHOR]

Near-infrared-downconversion-near-infrared (NIR-DC-NIR) bioimaging based on lanthanide doped upconversion nanoparticles (UCNPs) has received much attention due to its deeper penetration, and higher contrast imaging and signal-to-noise ratio in biological tissues. The size of UCNPs determines the mechanism and rate of cell uptake of the nanoparticles and their ability to permeate through biological tissues. Herein, we experimentally and theoretically demonstrate downconversion-near-infrared (DC-NIR) emission behavior in different sized UCNPs ranging from 5–150 nm. Interestingly, 15–40 nm UCNPs have more effective DC-NIR emissions than 150 nm UCNPs and an extremely high excitation threshold, which is entirely different from the size-dependent upconversion-visible (UC-VIS) emissions usually observed in UCNPs. We also observed that the intensity ratio of the DC-NIR emission to the UC-VIS emission decreases with the increase of the particle size and the excitation power, attributed to the more efficient upconversion (UC) process. Finally, we further confirmed that the competition process between the UC population and non-radiative relaxation to the DC-NIR level plays a key role in size-independent DC-NIR emissions. Our discovery would provide guidance for optimizing and designing NIR-DC-NIR NPs for bioimaging applications. [ABSTRACT FROM AUTHOR]

Reference 1 Chen J, Lei S, Huang Y. The relationship between Lipocalin-2 level and hepatic steatosis in obese patients with NAFLD after bariatric surgery. B Correction: Lipids Health Dis 21, 10 (2022) b B https://doi.org/10.1186/s12944-022-01622-0 b Following publication of the original article [[1]], the authors reported an error in affiliations. [Extracted from the article]

Background: With the current increased longevity in elderly population, surgeons can expect to operate more frequently on elderly patients with both malignancies and comorbid medical conditions. This study aimed to compare the surgical and early postoperative outcomes of laparoscopy-assisted distal gastrectomy (LADG) with those of open distal gastrectomy (ODG) for gastric cancer in patients 70 years of age or older.Methods: Retrospective analysis based on a prospectively collected database of elderly patients who underwent laparoscopy-assisted distal gastrectomy or ODG from February 2013 to January 2014. Preoperative patient baseline parameters, surgical and oncological outcomes, postoperative complications and pathologic results were analyzed in this report.Results: Distal gastrectomy was performed for 50 patients with the age of 70 years or older, using laparoscopic surgery for 23 patients (LADG group) and open surgery for 27 patients (ODG group). The mean age of LADG group was 76.6 years and ODG group 80.0 years. The comparison between the two groups revealed statistically similar results regarding age, gender, BMI, ASA class, history of previous surgeries, CCI and pathologic characteristics. The LADG group was characterized by less intraoperative blood loss (LADG group 100 mL vs. ODG group 250 mL, P < 0.001), less narcotic use (LADG group 1 day vs. ODG group 3 days, P < 0.001), faster bowel function recovery (time to first flatus: LADG group 51.6 h vs. ODG group 67.2 h, P < 0.001; days to oral intake: LADG group 6.1 days vs. ODG group 7.9 days, P = 0.002) and shorter postoperative hospital stay (LADG group 12 days vs. ODG group 16 days, P < 0.001). There was no significant difference in postoperative complication rate (overall complication rate: LADG group 21.7 % vs. ODG group 25.9 %, P = 0.730), survival rate (P = 0.719), postoperative recurrence and metastasis rate between the patients who underwent LADG and ODG.Conclusions: LADG for gastric cancer is feasible, efficacious and safe in elderly patients and may be superior to conventional open resection as regards some surgical outcomes. [ABSTRACT FROM AUTHOR]

Background: Bariatric surgeries have been widely used in obesity associated type II diabetes. However, the mechanisms of surgical treatments for type II diabetes in non-obese patients remain controversial. Our study aims to compare the effectiveness of various bariatric surgeries in a non-obese diabetic rat model. Methods: Goto-Kakisaki (GK) rats were used to compare the outcome of total gastrectomy (TG), Roux-en-Y reconstruction after total gastrectomy (RYTG), and Roux-En-Y gastric bypass (RYGB). Body weight, food and water intake, and glucose level were monitored prior to and after surgery. Oral glucose tolerance tests (OGTT) were performed, and key metabolic hormones were measured at selected time points. Results: Despite a significant reduction in body weight in TG and RYTG groups, their glucose metabolic rate was not improved. RYGB rats, with only moderate reduction in food intake and body weight, had significantly improved glucose metabolism. Insulin and ghrelin were significantly reduced in TG and RYTG groups, but remained unchanged in RYGB group. Conclusions: Our study demonstrated the effectiveness of RYGB surgery in treating type II diabetes in non-obese diabetic rats. These results suggest an important role of gastric system in regulating glucose homeostasis. [ABSTRACT FROM AUTHOR]

The surface plasmon (SP) modulation is a promised way to highly improve the strength of upconversion luminescence (UCL) and expand its applications. In this work, the 'islands' Au-Ag alloy film is prepared by an organic removal template method and explored to improve the UCL of NaYF4: Yb3+, Tm3+/Er3+. After the optimization of Au-Ag molar ratio (Au1.25-Ag0.625) and the size of NaYF4 nanoparticles (NPs, ≈7 nm), an optimum enhancement as high as 180 folds is obtained (by reflection measurement) for the overall UCL intensity of Tm3+. Systematic studies indicate that the UCL enhancement factor (EF) increases with the increased size of metal NPs and the increase of diffuse reflection, with the decreased size of NaYF4 NPs, with the decreased power density of excitation light and with improving order of multiphoton populating. The total decay rate varies only ranging of about 20% while EF changes significantly. All the facts above indicate that the UCL enhancement mainly originates from coupling of SP with the excitation electromagnetic field. Furthermore, the fingerprint identification based on SP-enhanced UCL is realized in the metal/UC system, which provides a novel insight for the application of the metal/UC device. [ABSTRACT FROM AUTHOR]

Here, we report the wavelength-dependent and angle-dependent upconversion luminescence (UCL) enhancement of NaYF4:Yb3+,Tm3+@NaYF4:Yb3+,Nd3+ core–shell nanocrystals (NCs) resulting from Ag grating structures, which provides a novel insight for improving UCL. [ABSTRACT FROM AUTHOR]

Background: Recent interest in laparoscopic right colectomy with D3 lymphadenectomy for right colon cancer, has raised renewed attention to the anatomic variations of the gastrocolic trunk of Henlé (GTH). Understanding the vascular structure of the GTH region for individual patients should improve surgical outcomes. The goal of this nationwide multicenter study (Anatomical Classification of Henlé's Trunk in Laparoscopic Right Hemi-colectomy (HeLaRC) trial) was to study the anatomic patterns of the GTH region, to clarify the implications of GTH in laparoscopic right colectomy with D3 lymphadenectomy (D3-RC) and analyze their clinical significance.Methods: We enrolled 583 patients from 26 centers across China who underwent D3-RC. The number of tributaries, length and types of GTH constitutions and their influence on intra-operative data were investigated. A nomogram score (based on the length of GTH, body mass index (BMI), tumor location, T stage and type of GTH (type I vs. non-type I) was established to assess the potential hazard of bleeding.Results: The GTH was found in 567 patients (97.3%). The distribution of GTH types was 0 (14.1%, n = 80), I (53.3%, n = 302), II (27.0%, n = 153), III (5.6%, n = 32). Of note, the type I GTH, T1 stage and tumor location at ileocecal or ascending colon were correlated with shorter exposure time of the GTH region (P < 0.0001). Short length of GTH (P = 0.002) and tumor location (transverse colon vs. non transverse colon) (P = 0.003) were correlated with the amount of GTH bleeding during the surgery. Nomogram discrimination was good (C-index: 0.72 (95% CI: 0.64, 0.80)). The dissection plane was better in patients with type I GTH than with other types (P = 0.023).Conclusion: GTH pattern variations may affect surgical outcomes in patients undergoing D3-RC. Better recognition of GTH anatomy might lead to a safer operation with better oncologic quality. [ABSTRACT FROM AUTHOR]

The interface defects and energy barrier between perovskite and electron transport layer (ETL) severely hinder the further improvement of the efficiency and stability of the perovskite solar cells (PSCs). Therefore, there is an urgent desire to develop multifunctional interface modulators to manage the interface between perovskite and ETL. Here, a multifunctional bottom-up double-layer interface modulation strategy is developed, that is, 2,2′-[[12,13-Bis(2-butyloctyl)− 12,13-dihydro-3,9-dinonylbisthieno[2'',3'':4′,5′]thieno[2′,3′:4,5]pyrrolo[3,2-e:2′,3′-g][2,1,3]benzothiadiazole-2,10-diyl]bis[methylidyne(5,6-chloro-3-oxo-1 H-indene-2,1(3 H)-diylidene)]]bis[propanedinitrile] (BTP-eC9) is combined in the SnO 2 /perovskite interface to achieve high efficiency and outstanding stability of PSCs. The BTP-eC9 can effectively prevent the detrimental contact between the FTO and perovskite and construct two electron transport paths by formatting the cascade energy level structure, which can eliminate the probability of carrier recombination and improve the interfacial carrier transfer. Chemically, BTP-eC9 can not only passivate the uncoordinated Sn ions, showing high conductivity and large photo-generated carrier transmission efficiency, but also can effectively passivate the underlying perovskite defects through a spontaneous bottom-up passivation process and improve the nucleation and crystallization kinetics of perovskite films. Based on the above efficient synergy, the power conversion efficiency (PCE) of up to 23.10% was obtained and it retains 90% of its original PCE after 8000 h in the ambient atmosphere without any encapsulation by the two-step method. In addition, the champion PCE of 23.75% with ultrahigh open-circuit voltage (V OC) of 1.25 V was achieved by the one-step method and this V OC is the highest value of a perovskite film with a band gap of approximately 1.60 eV, demonstrating the effectiveness and universality of this strategy. This research guides design methods of the ETL to raise the PCE of PSCs by interfacial engineering. [Display omitted] • The BTP-eC9 is designed as a multifunctional bottom-up interface modulation and combined in the SnO 2 /perovskite interface. • The BTP-eC9 can effectively prevent the detrimental contact between FTO and perovskite to improve the carrier transfer. • The BTP-eC9 can not only passivate the uncoordinated Sn ions, but also passivate the underlying perovskite defects. • PSCs retain 90% of its original PCE after 8000 h in the ambient atmosphere without encapsulation by the two-step method. • The double-layer interface optimization strategy provides an avenue for further improve the performance of PSCs. [ABSTRACT FROM AUTHOR]

[Display omitted] • Down-converter enhances device UV stability and UV light utilization. • CIGSe quantum dots broaden photoresponse range of perovskite solar cells to 920 nm. • CIGSe and down converters coordinated to enhance the light harvesting capacity. The light loss caused by the incomplete utilization of the solar energy spectrum is a key factor that impedes the photoelectric conversion efficiency of perovskite solar cells (PSCs). Hence, reducing the light escape through enhancing the utilization of ultraviolet (UV) light, and expanding the response of PSCs in the near-infrared (NIR) range is the key factor to further improve the photoelectric conversion efficiency (PCE) of PSCs. However, there is a lack of literature on engineering UV and NIR light harvesting at the same time. Herein, the NaYF 4 :Ce,Tb@NaYF 4 core–shell nanocrystals with efficient photon downconversion ability from UV to visible are designed to be embedded in the electron transporting layer (ETL), which serves as the photon downconverters and defect passivators, successfully improving the light response in both UV and visible region. The CIGSe quantum dots (QDs) with excellent infrared light harvesting ability, together with the plasmonic Au nanorods (NRs), are assembled in the hole transporting layer (HTL) to expand and improve the NIR light harvesting. The light response of the PSCs was successfully broadened to the NIR region from 800 to 920 nm. As a result, the champion PSC device insulating with NaYF 4 :Ce,Tb@NaYF 4 nanocrystals and CIGSe QDs demonstrates a remarkably increased PCE from 19.38% to 22.60%. The modified PSC devices also demonstrate highly improved UV and long-term stability. This work suggests a universal strategy to improve the UV and near-infrared light harvesting of PSCs, which is of great importance for fabricating PSCs with response to full spectrum. [ABSTRACT FROM AUTHOR]

Purpose: This study aims to investigate the role of siRNA silencing fibroblast growth factor receptor (FGFR) expression in promoting chemotherapy effect of gastric cancer and to explore its mechanism. Methods: Human gastric cancer cells MGC80-3 were divided into four groups: control group, cisplatin group (2 μg/L), cisplatin (2 μg/L) + siRNA group and siRNA group. The expressions of FGFR in four groups were detected by immunofluorescence. The cell proliferation and apoptosis were detected by MTT assay and flow cytometry. The protein expression levels of vascular endothelial growth factor receptor (VEGFR), caspase-3 and Bax were detected by Western blot. Further, animal model of gastric cancer was established and divided into four groups as in vitro experiment. The expression of FGFR mRNA in tumor tissue was detected by the real-time fluorescence quantitative polymerase chain reaction. The size of tumor was measured to analyze the effects of treatment. Histopathological detections were performed by hematoxylin and eosin staining and immunohistochemistry. Results: For in vitro experiment, significant decrease inFGFR expression, inhibition of proliferation and promotion of apoptosis were observed in siRNA-treated cells, so as cisplatin group. siRNA also resulted in the reduction of VEGFR and rise in apoptosis-related protein (caspase-3). As for the experiment in vivo, siRNA also suppressed the expression of FGFR and enhanced tumor shrink. Furthermore, the co-administration of siRNA and cisplatin revealed a more excellent antitumor effect than other therapies. Conclusions: siRNA can effectively suppress FGFR expression and cell proliferation, but promote apoptosis in vitro and also inhibit tumor growth and FGFR production in vivo. siRNA-participated chemotherapy may provide an efficient therapeutic approach to treat gastric cancer. [ABSTRACT FROM AUTHOR]

• Single-walled carbon nanotubes acts as a double hole transport layer. • Multifunctional bulk organic heterojunction provides additional light harvesting. • Heterojunction and buffer layer enhance the stability of perovskite solar cells. Currently, the high-efficiency lead organic–inorganic hybrid perovskite solar cells (PSCs) can only utilize a relatively small fraction of sunlight (300–800 nm) due to the limited tunability of optical bandgap, which is the key factor limiting the further improvement of the photoelectric conversion efficiency (PCE) of PSCs. Here, we report a method to blend the narrow band gap non-fullerene acceptor molecule Y18 and the wide band gap donor molecule PM6 to form a multifunctional bulk organic heterojunction active layer. To avoid the loss of voltage and fill factor caused by the compromised hole transport layer (HTL), we introduce the single-walled carbon nanotubes as a buffer layer to fabricate a double HTL. The champion device displays a PCE improvement from 20.05% to 22.82% with a relative increase of 13.81%. After a deep examination of the mechanism, organic heterojunction provides the multifunctional roles as follows: (1) providing additional harvesting to the near-infrared light ranging of 800–950 nm; (2) passivating the perovskite surface and grain boundary to reduce the defect density; (3) promoting hole extraction from perovskite to HTLs by forming cascade energy levels. Moreover, the stability of PSCs is considerably enhanced because the introduction of organic heterojunction and buffer layer design isolated the natural degradation, which enhances the tolerance towards water and oxygen. Finally, a module group is fabricated by connecting two series modules in parallel, which is served as a power source to light the diode screen. This work demonstrates a buffer layer design for fabricating organic heterojunction-perovskite integrated solar cells to expand the near-infrared response, which provides a novel approach for designing integrated solar cells in the future. [ABSTRACT FROM AUTHOR]

Two-dimensional (2D) all-inorganic halide perovskites exhibit impressive optical and electrical properties, which are attracting extensive current interests. Rare earth (RE) ions doping is a significant method to adjust their optical, electrical properties and realize various applications. However, 2D RE ions-doped perovskite crystals have been rarely reported. Herein, we reported the synthesis of novel 2D all-inorganic perovskite CsPbCl x Br 3−x nanosheets (NSs) doped with RE ions. The octylamine (OLAm) with short carbon chains is used to tune the growth orientation for the preparation of 2D perovskite NSs. The morphology of the NSs can be adjusted by varying the ratio of shorter ligands to longer ligands and changing the temperature. The Yb3+ ions doped CsPbClBr 2 NSs demonstrate an excitonic emission of perovskite host and a quantum cutting emission of Yb3+ ions at 985 nm with the optimal photoluminescence quantum yield (PLQY) of 128%. The results of femtosecond time-resolved transient absorption spectroscopy and DFT calculations indicate that the defect density of NSs is largely decreased and the photostability is enhanced induced by the passivation effect of Yb3+ ions. The photodetector (PD) based on lateral assembled Yb3+ ions doped CsPbClBr 2 NS film is fabricated, which demonstrates a high responsivity and dual-band detection capability. The as-fabricated PDs are sensitive to both UV and NIR light, showing the responsivity of 1.96 A W−1, 0.12 mA W−1, the detectivity of 5 × 1012, 2.15 × 109 Jones at 440 nm and 980 nm, respectively. Finally, based on an imaging system with a PD array and a data analysis system, visual photoelectric detection is realized, and high-contrast images of the measured UV and NIR light are displayed. This work paves the way to tune the properties of 2D perovskite materials and develop high-performance optoelectronic devices. In this work, a modified hot-injection method was demonstrated to synthesize the all-inorganic CsPbX 3 (X Cl, Cl/Br) perovskite NSs doped with Yb3+ ions, realizing more effective quantum cutting of Yb3+ ions with PLQY of 128%. Eventually, PDs based on the laterally assembled Yb3+ doped NS film were fabricated, which can realize multi-band detection and distinction of UV and NIR light. Moreover, the UV light imaging system was designed, which can collect the detection signal from the PD array and display the image. [Display omitted] ● Yb3+ doped CsPbX 3 nanosheets are synthesizedPhotodetectors can detect and distinguish UV, NIR lightVisual photoelectric detection is realized. ● The photodetectors based on Yb3+ doped nanosheet film showed the ability to detect and distinguish the UV and NIR light. ● The UV light imaging system was designed, which can collect the detection signal from the photodetector array and display the image. [ABSTRACT FROM AUTHOR]

Additive engineering is one of the most effective techniques for optimizing the performance of perovskite solar cells (PSCs). However, the previous research mainly focused on adopting this strategy to a single layer of the PSCs. In this work, a double-layer synergistic optimization approach is employed by simultaneously introducing functional black phosphorus quantum dots (BPQDs) into the electron transport layer (ETL) and perovskite layer. The BPQDs with superior conductivity is doped into SnO 2 ETL to effectively fill the electron traps and enhance electron mobility of SnO 2. Meanwhile, the 3-aminopropyltriethoxysilane-modified BPQDs (BPQDs@APTES) is introduced into the perovskite bulk to moderately tailor its intrinsic characteristics, and this synchronously facilitates the perovskite nucleation and growth, passivates defects and improves moisture-resistance of perovskite film. Taking advantage of the synergistic effects, efficient PSCs with power conversion efficiency of 22.85% with ultrahigh open-circuit voltage (V OC) of 1.22 V is demonstrated, this V OC value ranks in the highest values of perovskite film with a bandgap of ~ 1.60 eV. Additionally, the non-encapsulated BPQDs modified PSCs show better long time and humidity stability. In this work, a double-layer synergistic optimization strategy is demonstrated through incorporating functional black phosphorus quantum dots (BPQDs) into the SnO 2 and perovskite layer. Eventually, the perovskite solar cells (PSCs) with functional BPQDs modification achieve a champion efficiency of 22.85% with ultrahigh open-circuit voltage (V OC) (1.22 V). This work provides a route to design strategies within electron transport layer (ETL) and perovskite bulk to improve the performance of the PSCs. [Display omitted] • The BPQDs is designed as a bifunctional reagent and synchronously incorporated into the SnO2 and perovskite bulk. • The BPQDs can effectively fill the electron traps and passivate defect of SnO 2. • The BPQDs@APTES can facilitate perovskite growth, passivate defects and improve moisture-resistance of perovskite film. • High-efficiency (22.85%) PSCs with a VOC of 1.22 V are reported for a perovskite film having a bandgap of ~ 1.60 eV. • The double-layer synergistic optimization strategy provides an avenue for further improve the performance of PSCs. [ABSTRACT FROM AUTHOR]

All inorganic CsPbBr3 superstructures (SSs) have attracted much research interest due to their unique photophysical properties, such as their large emission red-shifts and super-radiant burst emissions. These properties are of particular interest in displays, lasers and photodetectors. Currently, the best-performing perovskite optoelectronic devices incorporate organic cations (methylammonium (MA), formamidinium (FA)), however, hybrid organic–inorganic perovskite SSs have not yet been investigated. This work is the first to report on the synthesis and photophysical characterization of APbBr3 (A = MA, FA, Cs) perovskite SSs using a facile ligand-assisted reprecipitation method. At higher concentrations, the hybrid organic–inorganic MA/FAPbBr3 nanocrystals self-assemble into SSs and produce red-shifted ultrapure green emissions, meeting the requirement of Rec. 2020 displays. We hope that this work will be seminal in advancing the exploration of perovskite SSs using mixed cation groups to further improve their optoelectronic applications. [ABSTRACT FROM AUTHOR]

Intermittent fasting (IF) plays a critical role in mitigating obesity, yet the precise biological mechanisms require further elucidation. Here Orosomucoid 2 (Orm2) is identified as an IF‐induced hepatokine that stimulates adipose browning. IF induced Orm2 expression and secretion from the liver through peroxisome proliferator‐activated receptor alpha (PPARα). In adipose tissue, Orm2 bound to glycoprotein 130/interleukin 23 receptor (GP130/IL23R) and promoted adipose browning through the activation of p38 mitogen‐activated protein kinases (p38‐MAPK). In obese mice, Orm2 led to a significant induction of adipose tissue browning and subsequent weight loss, an effect that is not replicated by a mutant variant of Orm2 deficient in GP130/IL23R binding capability. Crucially, genetic association studies in humans identified an obesity‐associated Orm2 variant (D178E), which shows decreased GP130/IL23R binding and impaired browning capacity in mice. Overall, the research identifies Orm2 as a promising therapeutic target for obesity, mediating adipose browning through the GP130/IL23R‐p38 signalling pathway. [ABSTRACT FROM AUTHOR]

One-dimensional (1D) CsPbI 3 nanorods (NRs) possess the suitable bandgap, extinction coefficient, long exciton diffusion radius and directed conductive channel, which make them advantageous for numerous optoelectronic devices. However, the direct synthesis of high-quality CsPbI 3 NRs remains a challenge. Here, we develop a direct and facile synthetic approach to prepare the CsPbI 3 NRs by YCl 3 promotion. The YCl 3 is not only the inducement of anisotropic growth of NCs, but also the source of passivator for improving the stability of NCs. Because of an effective YCl 3 passivation, the efficient red emitting CsPbI 3 NCs with photoluminescence quantum yield (PLQY) of 97% was achieved. More importantly, the YCl 3 promoted CsPbI 3 NRs with small aspect ratio of ~3.2 exhibit the PLQY of 84%, the highest value obtained from the red perovskite NRs. The fluorescence anisotropy of 0.184 mmol-YCl 3 promoted CsPbI 3 NRs is 0.38, and the rotational diffusion time τ rot = 1000 ns. The analysis on fluorescence anisotropy of the CsPbI 3 perovskite NRs proves that the size in length and width is consistent with the result measured by TEM images of as-prepared perovskite NRs. Meanwhile, conductivities of the films made of 0.184 mmol-YCl 3 promoted CsPbI 3 NRs is 2.94 × 10−1 S/cm, which is 17 times higher than 1.70 × 10−2 S/cm of bare CsPbI 3 nanocubes. Furthermore, various CsPbI 3 NCs are employed to prepare light-emitting diodes (LEDs). The YCl 3 promoted CsPbI 3 NRs based LEDs display an optimum external quantum yield (EQE) of 10.5%, and luminance of 1672 cd/m2. These results prove that the as-prepared YCl 3 promoted CsPbI 3 NRs have promising prospect in optoelectronic devices. ga1 • A direct and facile synthetic approach was developed to prepare YCl 3 promoted CsPbI 3 NRs. • The fluorescence anisotropy of the CsPbI 3 NRs was studied. • The YCl 3 promoted CsPbI 3 NRs based LEDs have been prepared. • Compared with CsPbI 3 nanocubes, CsPbI 3 NRs with better conductivity have promising prospect in optoelectronic devices. [ABSTRACT FROM AUTHOR]

Silicon (Si) photodetectors (PDs) have been extensively utilized as an attractive building block for optoelectronic devices, but are limited by the weak ultraviolet (UV) photo-response. Herein, we employ the extremely efficient UV to near-infrared quantum cutting emissions to boost the UV response of Si PDs for the first time. Experimental and theoretical results demonstrate the Cr3+, Yb3+, Ce3+ tri-doped CsPbCl 3 perovskite quantum dots (PeQDs) are successfully fabricated, with the photoluminescent quantum yields (PLQYs) of 188% and excellent stability, which can be attributed to the enhanced exciton binding energy, reduced defects and high tolerance factor through Cr3+ doping, and the improved energy transfer from PeQDs to Yb3+ via bridging the energy gap by Ce3+ doping. Meanwhile, the 5 d high energy states of Ce3+ ions significantly enhance UV absorption of PeQDs. Through integrating PeQDs with Si PDs, it realizes the full spectrum response spanning from 200 nm to 1100 nm with excellent stability. Especially, their external quantum efficiency (EQE) exceeds 70% in the range of 200–400 nm, which is the highest one compared to the previous literatures. The findings highlight a powerful tool to improve the quantum cutting emissions and expand their PDs applications. Schematic diagram on Si PDs integrating with quantum cutting CsPbCl 3 :Cr3+,Yb3+,Ce3+ PeQDs under full lights illumination. Image 1 • We employ the extremely efficient UV to near-infrared quantum cutting emissions to boost the UV response of Silicon photodetectors. • The Cr3+, Yb3+, Ce3+ tri-doped CsPbCl 3 PeQDs are successfully fabricated, with the PLQYs of 188%. • The 5 d high energy states of Ce3+ ions significantly enhance UV absorption of PeQDs and it realizes the full spectrum response spanning from 200 nm to 1100 nm. • Especially, the EQE exceeds 70% in the range of 200–400 nm, which is the highest one compared to the previous literatures. [ABSTRACT FROM AUTHOR]

Filterless narrowband near-infrared photodetectors (NIRPDs) offer significantly reducing cost and the system volume for various applications, but limited by the poor photosensitivity. Herein, we theoretically and experimentally demonstrate a novel class of sensitive filterless NIRPDs in CsPbF 3 : Zn2+-Yb3+- Tm3+ (or Er3+) perovskite nanocrystals (PeNCs)/Au nanorods (NRs) array hybrid via direct photon-electric upconverion (UC) from ground state of Yb3+- Tm3+ (or Er3+) to conduction band of PeNCs. It shows the selectively spectral photodetection at 980-nm NIR region with all full-width at half-maximum of 20 nm, high responsivity of 106 A/W, detectivity of 1.52 × 1012 Jones, and external quantum efficiency of 135%. The excellent performance can be mainly ascribed to (1) direct photon-electric UC mechanism; (2) the reduced trapping-center density, high carrier mobility, and increased extraction and separation efficient of election-hole pairs of PeNCs; (3) localized surface plasmon enhancement. Our findings open the exciting potential for developing the next-generation narrow NIRPDs. Schematic illustration of electron injection process of CsPbF 3 : Zn2+ - Yb3+ - Er3+PeNCs for NIRPDs. Image 1 • Herein, we theoretically and experimentally demonstrate a novel class of sensitive filterless NIRPDs in CsPbF 3 : Zn2+-Yb3+- Tm3+ (or Er3+) perovskite nanocrystals (PeNCs)/Au nanorods (NRs) array hybrid via direct photon-electric upconverion (UC) from ground state of Yb3+- Tm3+ (or Er3+) to conduction band of PeNCs. • It shows the selectively spectral photodetection at 980-nm NIR region with all full-width at half-maximum of 20 nm, high responsivity of 106 A/W, detectivity of 1.52 × 1012 Jones, and external quantum efficiency of 135%. • The excellent performance can be mainly ascribed to (1) direct photon-electric UC mechanism; (2) the reduced trapping-center density, high carrier mobility, and increased extraction and separation efficient of election-hole pairs of PeNCs; (3) localized surface plasmon enhancement. • This work is of general interests to researchers working in perovskite nanocrystals, upconversion luminescence materials, solar energy harvesting, photodetectors. [ABSTRACT FROM AUTHOR]

Cartoon overview of plamsonic copper chalcogenide (Cu 2−x E; E = S, Se, and Te) binary NCs: their synthesis, LSPR tuning, and applications. • The review devoted to self-doped plasmonic copper chalcogenide binary NCs. • The factors that impact their localized surface plasmon resonances (LSPRs) and the synthesis methods for tuning the LSPRs were summarized. • We emphasize the underlying mechanisms of LSPR generation and the unique roles and advantages of the copper chalcogenide NCs. Owing to their extraordinary surface plasmon and semiconductor properties, copper chalcogenide nanocrystals (NCs) have experienced a steeply increased interest for various types of applications since the first discovery of their plasmonic property in 2009. This article critically and comprehensively reviews the decade long research effort devoted to doped plasmonic copper chalcogenide binary NCs with respect to their synthesis methods, their theoretical description and various applications. In particular, we focus on factors that impact their localized surface plasmon resonances (LSPRs) and on methods used for tuning the LSPRs. We emphasize the underlying mechanisms of LSPR generation and the unique roles and advantages of the copper chalcogenide NCs with respect to the commonly attended plasmonic metal nanoparticles. Finally, we review current challenges in the field of copper chalcogenide NCs and give a perspective for further research. We believe that this review provides a timely and concise summary of the field of plasmonic copper chalcogenide NCs for the benefit and inspiration of its rapid and formulated development. [ABSTRACT FROM AUTHOR]

Interfacial engineering is one of the most effective means to improve the photoelectric conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). In this work, Ln3+‐based halide Cs3TbCl6 quantum dots (QDs) are synthesized through a modified hot‐injection method, which displays an excitonic emission centered at 431 nm and the characteristic emission peaks of Tb3+ ions. Then, the Ln3+‐based halide Cs3TbCl6 QDs are introduced to the interface of Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3 perovskite films in the PSCs, which can regulate the energy levels, fill the grain boundaries and remove the ionic defects. Surprisingly, the Cs3TbCl6 QDs modified devices achieve a champion PCE of 22.89% with a super high open‐voltage of 1.235 V. The high open‐voltage can be mainly attributed to the better bandgap alignment, enhanced interface, and reduced defects density. Afterward, the hole transport layer (HTL) is modified by the black phosphorus QDs (BPQDs), yielding a champion PCE of 23.49% and a filling factor of 80.32%. The Cs3TbCl6 QDs modified unencapsulated device possesses well environmental stability and humidity stability. This work demonstrates a new kind of Ln3+‐based metal QDs and explores a new approach to fabricate the PSCs with high open‐voltage, high efficiency, and good stability through the QD‐based passivation techniques. [ABSTRACT FROM AUTHOR]

In recent years, CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) have been considered as the most promising materials for light‐emitting diodes (LEDs). However, the advances of CsPbX3 quantum dot‐based light emitting diodes (QLEDs) still lagged behind inorganic III–V LEDs and other organic LEDs. Herein, a strategy to improve the performances of perovskite QLEDs is reported by utilizing the localized surface plasmon resonance (LSPR) effects of Au nanospheres (NSs). It is accomplished by introducing a Au NS layer into the electron transport layer of Ca2+‐CsPbBr3 QLEDs, where the diameter and spacing of Au NSs and the interaction distance between the Ca2+‐CsPbBr3 QD and Au NS layers are modulated, according to the theoretical simulation of Finite‐difference time‐domain. As a result, the photoluminescence quantum yield of Ca2+‐CsPbBr3 QD layer is improved from 31.5% to 73.3%. Finally, the luminance of Ca2+‐CsPbBr3 QLEDs is improved from 16824 to 63931 cd m–2 and external quantum efficiency (EQE) is improved from 4.2% to 10.5%. The radiative transition rate can be remarkably modulated from 0.7 × 107 to 6.6 × 107 s–1. The enhancement in luminance and EQE are the best values in the LSPR modified perovskite QLEDs and the strategy offered in this work fits with other LEDs and optoelectrical devices. [ABSTRACT FROM AUTHOR]

Introduction of fluorescent down‐conversion layer inside perovskite solar cells (PSCs) can highly improve the ultraviolet response of the devices and the light stability. However, such a device is usually confronted with the problem of inter‐diffusion with the perovskite absorber layer, which severely limits its further development. To address this problem, herein, this work employs an interfacial dual electron transport layers (ETLs) strategy, sandwiching Cd‐CsPbCl3:Mn2+ luminescent quantum dots within gap of the ETLs, which not only reduces the interface energy level offset, but also improves the nucleation and crystallization kinetics of perovskite films and prevents their diffusion to the perovskite absorber layer. As a result, the efficient synergy effect effectively elevates both the open‐circuit voltage and fill factor of the PSCs, reaching maximum values of 1.181 V and 81.14%, respectively, finally delivering progressively increased device power conversion efficiency (PCE) of 24.32% with significantly improved light stability. To further improve the ultraviolet response, this work further adopts the strategy of dual fluorescent conversion layers inside and outside the PSCs, and finally obtains PCE of 24.63%, which is the best for various luminescent conversion cells. This work opens a new door for the development of efficient and stable photoluminescence conversion PSCs. [ABSTRACT FROM AUTHOR]

• ZnS shells remarkably increase the stability and efficiency of Yb3+-doped PeQDs. • ZnS enables perovskite host to Yb3+ energy transfer efficiencies as high as 81.3 %. • ZnS-coated PeQDs still light up when immersed in water for 70 h. • PeQDs@ZnS led to a 13.5 % relative increase in the photovoltaic efficiency of SSCs. • The T 80 of capped PeQDs@ZnS-SSCs under 25 °C and 50 % RH was 11,224 h. Yb3+ doped lead halide perovskite quantum dots (PeQDs) with efficient quantum cutting emission are thought to be the most promising photon energy converter for improving the performance of silicon-based electronics. Nevertheless, the low external quantum efficiency (EQE) and instability make it unfeasible for industrial use. Here, we present a unique PeQDs@ ZnS core–shell device that achieves outstanding stability and up to 39 % EQE by effectively controlling energy transfer from the PeQDs to the Yb3+ through ZnS coating. These advances are attributed to the large UV absorption and the strong localized effect of the ZnS shells on the conduction band electrons of the PeQDs. Density functional theory (DFT) first-principles simulations indicate that ZnS coating can facilitate the energy transfer of PeQDs to Yb3+. Power conversion efficiency (PCE) of silicon solar cells was significantly enhanced by ZnS-coated Yb3+ doped PeQDs, yielding a noteworthy 13.5 % relative PCE improvement over 30 measurement sets. Significantly, the stability of SSCs with ZnS-coated PeQDs films is considerably improved, resulting in a capped device T 80 lifespan of up to 11,224 h. Moreover, ZnS-coated PeQDs films can significantly boost the EQE of silicon photodiodes (Si-PDs) and extend their response to deep ultraviolet light. This paper presents an efficient and consistently stable photon energy converter with great commercialization potential. [ABSTRACT FROM AUTHOR]