Search

Your search keyword '"Tu, Langping"' showing total 188 results
Start Over Author "Tu, Langping"
188 results on '"Tu, Langping"'

3. Thermally Activated Delayed Fluorescence Dye‐Sensitized Down‐Conversion Nanoparticles for Near‐Infrared Luminescence Enhancement.

Author

Liu, Tongtong, Liang, Ning, Liu, Xiaomeng, Li, Jiaqi, Tu, Langping, Liu, Jianxun, Feng, Yansong, and Yao, Chang‐Jiang

Subjects
ENERGY levels (Quantum mechanics), DELAYED fluorescence, LIGHT absorption, BAND gaps, EXCITON theory, ENERGY transfer, INFRARED absorption
Abstract

Dye‐sensitized down‐conversion nanoparticles (DCNPs) can significantly enhance photon absorption, bridging the gap of narrow and weak absorption cross‐section of lanthanide (Ln) ions, thus fundamentally prompting their near‐infrared (NIR) emission. However, the ideal strategy for utilization of both the singlet and triplet energy of the dyes is hindered by the nanostructures and the dependence on the heavy atom effect. Herein, thermally activated delayed fluorescence (TADF) dye is utilized with a small singlet‐triplet energy gap as the absorption antenna, achieving a 733 fold emission enhancement. This strategy facilitates efficient intersystem crossing (ISC) and reverse intersystem crossing (RISC) processes, enabling effective energy transfer from singlet (S1) and triplet (T1) excitons to emitted energy levels of Er3+. Combining highly Erbium‐doped nanoparticles, the water‐dispersed AD‐sensitized system shows excellent hydrodynamic stability and photostability. This innovative approach marks the first report of TADF dye‐sensitized Ln nanosystems, offering a new direction for photo conversion technology. [ABSTRACT FROM AUTHOR]

Published
2025
Full Text
View/download PDF

14. Significantly Boosted Upconversion Emission in Cryogenic Er@Yb@Y Core–Shell–Shell Nanostructures.

Author

Wang, Enhui, Wang, Wei, Niu, Lujun, Feng, Yansong, Zhao, Haifeng, Luo, Yongshi, Zhang, Ligong, Li, Qiqing, Chen, Haoran, Chang, Yulei, Tu, Langping, Zhang, Hong, and Zuo, Jing

Subjects
PHOTON upconversion, NANOSTRUCTURES, INFORMATION technology security, LOW temperatures, CRYOGENICS, NANOSTRUCTURED materials
Abstract

Recent advances reveal that due to the cross‐relaxation restriction, impressive upconversion (UC) enhancement (≈100‐folds) can be achieved in cryogenic Er3+‐rich core‐inert shell nanostructures (e.g., NaErF4@NaYF4), which opens up exciting opportunities in diverse frontier applications. However, further promotion of UC intensity is still highly desired, in which the rational design of nanostructures can play a key role. Herein, it is demonstrated that adopting an active shell design will constantly benefit the UC within a wide temperature range (40–300 K). Specifically, through constructing the luminescent core@active shell@inert shell sandwich nanostructure (e.g., NaErF4@NaYbF4@NaYF4), 8.3–73‐folds UC enhancement will be achieved (taking the corresponding core@inert shell structures as competitors). Moreover, from spectral‐domain and time‐domain spectroscopic experiments, the relevant UC enhancement is convincingly attributed to a temperature‐dependent energy injection process (from the active shell to the luminescent core). More interestingly, the unique property of the material makes a temperature‐induced high‐level encryption application possible, which is obtained by employing the nanomaterials on a quick response (QR) code. These results not only deepen the UC mechanism in multi‐layer nanostructures, but also introduce an expanded dimension (via low temperatures) in information security. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

17. A scintillating nanoplatform with upconversion function for the synergy of radiation and photodynamic therapies for deep tumors

Author

Shilin Mei, Chang-Jiang Yao, Filippo Tamburini, Ive Que, Tu Langping, Yansong Feng, Jing Zuo, Hong Zhang, Alan Chan, Luis J. Cruz, Kefan Wu, Xiaomeng Liu, Qiqing Li, Fabio Baldazzi, Jun Yuan, and Molecular Spectroscopy (HIMS, FNWI)

Subjects
Chemistry, Materials science, Materials Chemistry, Nanotechnology, General Chemistry, Radiation, Photon upconversion
Abstract

Collaborative therapy is regarded as an effective approach in increasing the therapeutic efficacy of cancer. In this work, we have proposed and validated the concept of upconversion lumienscence image guided synergy of photodynamic therapy (PDT) and radiotherapy (RT) for deep cancer, via a specially designed nanoplatform integrating near infrared (NIR) light activated luminescence upconversion and X-ray induced scintillation. Upon NIR light irradiation, the nanoplatform emits highly monochromatic red light solely for imaging the targeted cancer cells without triggering therapy; however, when the irradiation turns to a low dose of X-rays, scintillation will occur which induces effectively the PDT destroying the cancer cells together with X-ray induced RT. The novel theranostic nanoplatform is constructed in such a way that the interactions between the upconversion core and the outmost scintillating shell are blocked effectively by an inert layer between them. This structural design not only enables a nearly perfect excitation energy delivery (∼100% at a spectral overlapping wavelength of ∼540 nm) from the outermost scintellating layer to the surface-anchored photosensitizers and so a maximum yield of radical oxygen species, but also achieves a strong NIR induced upconversion luminescence for imaging. Since PDT and RT attack different parts of a cancer cell, this synergy is more effective in destroying cancer than a single therapy, resulting in the reduction of the X-ray irradiation dosage. As a proof of principle, the theranostic effect is validated by in vitro and in vivo experiments, exhibiting the great potential of this sort of nanoplatform in deep cancer treatment., Nanoplatforms consisting of an upconversion nanocore and an outermost X-ray active shell for PDT enable photoswitchable UCL imaging and RT&X-PDT.

Published
2022

18. A 2D/3D heterojunction engineering for carbon-based hole-transport-layer-free perovskite solar cells

Author

Yuanjing Wang, Tie Liu, Jiawei Zhang, He Liu, Hongfei Li, Ying Lv, Xiaoyang Guo, Xingyuan Liu, Tu Langping, Yulei Chang, and Bin Li

Subjects
Fuel Technology, Renewable Energy, Sustainability and the Environment, Energy Engineering and Power Technology
Abstract

Formation of a two-dimensional (2D) perovskite layer on the top of three-dimensional (3D) perovskite has been demonstrated to be effective in reducing interfacial charge recombination and improving the performance and...

Published
2023
Full Text
View/download PDF

22. Cross Relaxation Channel Tailored Temperature Response in Er3+‐rich Upconversion Nanophosphor.

Author

Wu, Kefan, Wang, Enhui, Yuan, Jun, Zuo, Jing, Zhou, Ding, Zhao, Haifeng, Luo, Yongshi, Zhang, Ligong, Li, Bin, Zhang, Jiahua, Tu, Langping, and Zhang, Hong

Subjects
PHOTON upconversion, RARE earth metals, TRP channels, ELECTRON energy loss spectroscopy, ENERGY dissipation, TEMPERATURE
Abstract

Recently high doping of lanthanide ions (till 100 %) is realized unprecedentedly in nanostructured upconversion (UC) phosphors. However, oddly enough, this significant breakthrough did not result in a corresponding UC enhancement at ambient temperature, which hinders the otherwise very interesting applications of these materials in various fields. In this work, taking the Er3+‐rich UC nanosystem as an example, we confirm unambiguously that the phonon‐assisted cross relaxation (CR) is the culprit. More importantly, combining the theoretical modeling and experiments, the precise roles of different CR channels on UC energy loss are quantitatively revealed. As a result, lowering the temperature can exponentially enhance the relevant UC luminescence by more than two orders of magnitude. Our comprehension will play an important role in promoting the UC performance and further application of high doping rare earth materials. As a proof of concept, an Er3+‐rich core/multi‐shell nanophosphor is exploited which demonstrates the great potential of our finding in the field of ultra‐sensitive temperature sensing. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

26. Significant Enhancement of the Upconversion Emission in Highly Er3+‐Doped Nanoparticles at Cryogenic Temperatures.

Author

Tu, Langping, Wu, Kefan, Luo, Yongshi, Wang, Enhui, Yuan, Jun, Zuo, Jing, Zhou, Ding, Li, Bin, Zhou, Jiajia, Jin, Dayong, and Zhang, Hong

Subjects
*PHOTON upconversion, *NANOPARTICLES, *MONTE Carlo method
Abstract

Relatively low efficiency is the bottleneck for the application of lanthanide‐doped upconversion nanoparticles (UCNPs). The high‐level doping strategy realized in recent years has not improved the efficiency as much as expected. It is argued that cross relaxation (CR) is not detrimental to upconversion. Here we combine theoretical simulation and spectroscopy to elucidate the role of CR in upconversion process of Er3+ highly doped (HD) UCNPs. It is found that if CR is purposively suppressed, upconversion efficiency can be significantly improved. Specifically, we demonstrate experimentally that inhibition of CR by introducing cryogenic environment (40 K) enhances upconversion emission by more than two orders of magnitude. This work not only elucidates the nature of CR and its non‐negligible adverse effects, but also provides a new perspective for improving upconversion efficiency. The result can be directly applied to cryogenic imaging and wide range temperature sensing. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

28. A scintillating nanoplatform with upconversion function for the synergy of radiation and photodynamic therapies for deep tumors

Author

Feng, Yansong, primary, Liu, Xiaomeng, additional, Li, Qiqing, additional, Mei, Shilin, additional, Wu, Kefan, additional, Yuan, Jun, additional, Tu, Langping, additional, Que, Ivo, additional, Tamburini, Filippo, additional, Baldazzi, Fabio, additional, Chan, Alan, additional, Cruz, Luis J., additional, Zuo, Jing, additional, Yao, Changjiang, additional, and Zhang, Hong, additional

Published
2022
Full Text
View/download PDF

34. Ultrastrong Absorption Meets Ultraweak Absorption: Unraveling the Energy-Dissipative Routes for Dye-Sensitized Upconversion Luminescence

Author

Xue, Bin, primary, Wang, Dan, additional, Tu, Langping, additional, Sun, Dapeng, additional, Jing, Pengtao, additional, Chang, Yulei, additional, Zhang, Youlin, additional, Liu, Xiaomin, additional, Zuo, Jing, additional, Song, Jun, additional, Qu, Junle, additional, Meijer, Evert Jan, additional, Zhang, Hong, additional, and Kong, Xianggui, additional

Published
2018
Full Text
View/download PDF

35. Titelbild: Precisely Tailoring Upconversion Dynamics via Energy Migration in Core–Shell Nanostructures (Angew. Chem. 12/2018)

Author

Zuo, Jing, primary, Sun, Dapeng, additional, Tu, Langping, additional, Wu, Yanni, additional, Cao, Yinghui, additional, Xue, Bin, additional, Zhang, Youlin, additional, Chang, Yulei, additional, Liu, Xiaomin, additional, Kong, Xianggui, additional, Buma, Wybren Jan, additional, Meijer, Evert Jan, additional, and Zhang, Hong, additional

Published
2018
Full Text
View/download PDF

37. Cover Picture: Precisely Tailoring Upconversion Dynamics via Energy Migration in Core-Shell Nanostructures (Angew. Chem. Int. Ed. 12/2018)

Author

Zuo, Jing, primary, Sun, Dapeng, additional, Tu, Langping, additional, Wu, Yanni, additional, Cao, Yinghui, additional, Xue, Bin, additional, Zhang, Youlin, additional, Chang, Yulei, additional, Liu, Xiaomin, additional, Kong, Xianggui, additional, Buma, Wybren Jan, additional, Meijer, Evert Jan, additional, and Zhang, Hong, additional

Published
2018
Full Text
View/download PDF

47. Targeted labeling of an early-stage tumor spheroid in a chorioallantoic membrane model with upconversion nanoparticles

Author

Liu, Kai, primary, Holz, Jasmin A., additional, Ding, Yadan, additional, Liu, Xiaomin, additional, Zhang, Youlin, additional, Tu, Langping, additional, Kong, Xianggui, additional, Priem, Bram, additional, Nadort, Annemarie, additional, Lambrechts, Saskia A. G., additional, Aalders, Maurice C. G., additional, Buma, Wybren Jan, additional, Liu, Yichun, additional, and Zhang, Hong, additional

Published
2015
Full Text
View/download PDF

49. Towards high quality triangular silver nanoprisms: improved synthesis, six-tip based hot spots and ultra-high local surface plasmon resonance sensitivity

Author

Xue, Bin, primary, Wang, Dan, additional, Zuo, Jing, additional, Kong, Xianggui, additional, Zhang, Youlin, additional, Liu, Xiaomin, additional, Tu, Langping, additional, Chang, Yulei, additional, Li, Cuixia, additional, Wu, Fei, additional, Zeng, Qinghui, additional, Zhao, Haifeng, additional, Zhao, Huiying, additional, and Zhang, Hong, additional

Published
2015
Full Text
View/download PDF

50. A highly effective in vivo photothermal nanoplatform with dual imaging-guided therapy of cancer based on the charge reversal complex of dye and iron oxide

Author

Chang, Yulei, primary, Li, Xiaodan, additional, Kong, Xianggui, additional, Li, Ye, additional, Liu, Xiaomin, additional, Zhang, Youlin, additional, Tu, Langping, additional, Xue, Bin, additional, Wu, Fei, additional, Cao, Dianbo, additional, Zhao, Huiying, additional, and Zhang, Hong, additional

Published
2015
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results