Search

Your search keyword '"Wu, Zhaoxin"' showing total 699 results
Start Over Author "Wu, Zhaoxin"
699 results on '"Wu, Zhaoxin"'

153. Conjugated Molecules 'Bridge'

Author

Dong, Hua, Xi, Jun, Zuo, Lijian, Li, Jingrui, Yang, Yingguo, Wang, Dongdong, Yu, Yue, Ma, Lin, Ran, Chenxin, Gao, Weiyin, Jiao, Bo, Xu, Jie, Lei, Ting, Wei, Feijie, Yuan, Fang, Zhang, Lin, Shi, Yifei, Hou, Xun, Wu, Zhaoxin, Xi'an Jiaotong University, Seoul National University, University of Washington, Computational Electronic Structure Theory, Chinese Academy of Sciences, Xidian University, Department of Applied Physics, Aalto-yliopisto, and Aalto University

Subjects
delocalization, solar cells, interfacial dipole, perovskite, conjugation
Abstract

Interfacial ligand passivation engineering has recently been recognized as a promising avenue, contributing simultaneously to the optoelectronic characteristics and moisture/operation tolerance of perovskite solar cells. To further achieve a win-win situation of both performance and stability, an innovative conjugated aniline modifier (3-phenyl-2-propen-1-amine; PPEA) is explored to moderately tailor organolead halide perovskites films. Here, the conjugated PPEA presents both “quasi-coplanar” rigid geometrical configuration and distinct electron delocalization characteristics. After a moderate treatment, a stronger dipole capping layer can be formed at the perovskite/transporting interface to achieve favorable banding alignment, thus enlarging the built-in potential and promoting charge extraction. Meanwhile, a conjugated cation coordinated to the surface of the perovskite grains/units can form preferably ordered overlapping, not only passivating the surface defects but also providing a fast path for charge exchange. Benefiting from this, a ≈21% efficiency of the PPEA-modified solar cell can be obtained, accompanied by long-term stability (maintaining 90.2% of initial power conversion efficiency after 1000 h testing, 25 °C, and 40 ± 10 humidity). This innovative conjugated molecule “bridge” can also perform on a larger scale, with a performance of 18.43% at an area of 1.96 cm2.

Published
2019

162. Perovskite Solar Cells: Conjugated Molecules “Bridge”: Functional Ligand toward Highly Efficient and Long‐Term Stable Perovskite Solar Cell (Adv. Funct. Mater. 17/2019)

Author

Dong, Hua, primary, Xi, Jun, additional, Zuo, Lijian, additional, Li, Jingrui, additional, Yang, Yingguo, additional, Wang, Dongdong, additional, Yu, Yue, additional, Ma, Lin, additional, Ran, Chenxin, additional, Gao, Weiyin, additional, Jiao, Bo, additional, Xu, Jie, additional, Lei, Ting, additional, Wei, Feijie, additional, Yuan, Fang, additional, Zhang, Lin, additional, Shi, Yifei, additional, Hou, Xun, additional, and Wu, Zhaoxin, additional

Published
2019
Full Text
View/download PDF

165. Conjugated Molecules “Bridge”: Functional Ligand toward Highly Efficient and Long‐Term Stable Perovskite Solar Cell

Author

Dong, Hua, primary, Xi, Jun, additional, Zuo, Lijian, additional, Li, Jingrui, additional, Yang, Yingguo, additional, Wang, Dongdong, additional, Yu, Yue, additional, Ma, Lin, additional, Ran, Chenxin, additional, Gao, Weiyin, additional, Jiao, Bo, additional, Xu, Jie, additional, Lei, Ting, additional, Wei, Feijie, additional, Yuan, Fang, additional, Zhang, Lin, additional, Shi, Yifei, additional, Hou, Xun, additional, and Wu, Zhaoxin, additional

Published
2019
Full Text
View/download PDF

166. Towards high performance solution-processed orange organic light-emitting devices: precisely-adjusting properties of Ir(iii) complexes by reasonably engineering the asymmetric configuration with second functionalized cyclometalating ligands

Author

Sun, Yuanhui, primary, Yang, Xiaolong, additional, Liu, Boao, additional, Dang, Jingshuang, additional, Li, Yan, additional, Zhou, Guijiang, additional, Wu, Zhaoxin, additional, and Wong, Wai-Yeung, additional

Published
2019
Full Text
View/download PDF

167. A new type of solid-state luminescent 2-phenylbenzo[g]furo[2,3-b]quinoxaline derivative: synthesis, photophysical characterization and transporting properties

Author

Wang, Gang, primary, Li, Jie, additional, Li, Yixiang, additional, Wang, Dongdong, additional, Zhang, Jingjing, additional, Wu, Yong, additional, Zhen, Yong-gang, additional, Tang, Qingxin, additional, Ma, Hong, additional, Hu, Wenping, additional, Wu, Zhaoxin, additional, and Jen, Alex K.-Y., additional

Published
2019
Full Text
View/download PDF

172. Strategy for achieving efficient electroluminescence with reduced efficiency roll-off: enhancement of hot excitons spin mixing and restriction of internal conversion by twisted structure regulation using an anthracene derivative

Author

Yu, Yue, primary, Ma, Lin, additional, Feng, Zhao, additional, Liu, Boao, additional, Zhou, Huixin, additional, Qin, Hanlin, additional, Li, Huan, additional, Song, Jiangluqi, additional, Zhou, Guijiang, additional, and Wu, Zhaoxin, additional

Published
2019
Full Text
View/download PDF

173. Ultra-stable CsPbBr3 nanocrystals with near-unity photoluminescence quantum yield via postsynthetic surface engineering

Author

Zu, Yanqing, primary, Dai, Jinfei, additional, Li, Lu, additional, Yuan, Fang, additional, Chen, Xiang, additional, Feng, Zhicun, additional, Li, Kun, additional, Song, Xiaojuan, additional, Yun, Feng, additional, Yu, Yue, additional, Jiao, Bo, additional, Dong, Hua, additional, Hou, Xun, additional, Ju, Minggang, additional, and Wu, Zhaoxin, additional

Published
2019
Full Text
View/download PDF

178. Surface passivation of 1550nm AlxInyAsSb avalanche photodiode

Author

Zheng, Da’nong, primary, Sun, Yaoyao, primary, Jiang, Zhi, primary, Guo, Chunyan, primary, Lv, Yuexi, primary, Jiang, Dongwei, primary, Wang, Guowei, primary, Xu, Yingqiang, primary, Wang, Tao, primary, Tian, Jinshou, primary, Wu, Zhaoxin, primary, and Niu, Zhichuan, primary

Published
2018
Full Text
View/download PDF

180. Aggregation-induced phosphorescence emission (AIPE) behaviors in PtII(C^N)(N-donor ligand)Cl-type complexes through restrained D2d deformation of the coordinating skeleton and their optoelectronic properties.

Author

Yang, Hua, Li, Huiying, Yue, Ling, Chen, Xi, Song, Dongdong, Yang, Xiaolong, Sun, Yuanhui, Zhou, Guijiang, and Wu, Zhaoxin

Abstract

A series of four-coordinated PtII(C^N)(N-donor ligand)Cl-type complexes have been synthesized through combination between C^N-type and N-donor ligands with different sizes. Photophysical features, electrochemical behaviors and electroluminescent (EL) performances have been investigated in detail. Critically, the relationship between the size of organic ligands and aggregation-induced phosphorescence emission (AIPE) behaviors for these PtII(C^N)(N-donor ligand)Cl-type complexes has been characterized. With extending the dimensions of the C^N-type and/or N-donor ligands, the AIPE of these PtII(C^N)(N-donor ligand)Cl-type complexes is more likely to show up with lower H2O volumetric fractions (fw) in the THF solution of these complexes. These unique AIPE experimental results have clearly revealed a new AIE mechanism called restrained D2d deformation of the coordinating skeleton of these PtII(C^N)(N-donor ligand)Cl-type complexes from square-planar (D4h) in the ground states to the tetrahedron (Td) skeleton in the excited states. In addition, solution-processed organic light-emitting diodes (OLEDs) based on these AIPE emitters have been fabricated to characterize their EL potential. Impressive EL efficiencies with the maximum external quantum efficiency (ηext) of 25.2%, current efficiency (ηL) of 53.9 cd A−1 and power efficiency (ηP) of 43.5 lm W−1 can be achieved, indicating great potential of these PtII(C^N)(N-donor ligand)Cl-type AIPE emitters in the field of OLEDs. Importantly, this research has proposed a new AIE mechanism to promote the development of new phosphorescent AIPE complexes with great potential in the field of OLEDs. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

181. The synthesis of cyclometalated platinum(II) complexes with benzoaryl-pyridines as C^N ligands for investigating their photophysical, electrochemical and electroluminescent properties.

Author

Wang, Dezhi, Chen, Xi, Yang, Hua, Zhong, Daokun, Liu, Boao, Yang, Xiaolong, Yue, Ling, Zhou, Guijiang, Ma, Miaofeng, and Wu, Zhaoxin

Subjects
PHOSPHORESCENCE, LIGHT emitting diodes, ELECTROLUMINESCENCE, X-ray crystallography, CHEMICAL structure, QUANTUM efficiency, PLATINUM, ANTHRACENE derivatives
Abstract

A series of (C^N)Pt(acac)-type complexes has been successfully synthesized with a benzo[b]furan, benzo[b]thiophene, benzo[b]selenophene, or benzo[b]tellurophene group in the benzoaryl-pyridine ligand. Using X-ray crystallography, the chemical structures of the complexes with benzo[b]selenophene and benzo[b]tellurophene groups have been clearly revealed. The photophysical, electrochemical, and electroluminescent (EL) behaviors of these (C^N)Pt(acac)-type complexes have been fully characterized. Furthermore, both time-dependent functional theory (TD-DFT) and natural transition orbital (NTO) theoretical results have been obtained to gain insight into the absorption and emission features. It has been shown that both the absorption bands with the lowest energy and the phosphorescence emission behaviors are dominated by the benzoaryl-pyridine cyclometalating ligand. Importantly, the effects of the group VIA atoms on the properties of these (C^N)Pt(acac)-type complexes have been revealed. Owing to the rareness of (C^N)Pt(acac)-type complexes with benzo[b]selenophene and benzo[b]tellurophene groups, their EL abilities have been characterized using solution-processed organic light-emitting diodes (OLEDs). The optimized red OLEDs with the complex bearing a benzo[b]selenophene unit show a maximum external quantum efficiency (ηext) of 6.3%, current efficiency (ηL) of 10.5 cd A−1, and power efficiency (ηP) of 9.1 lm W−1, while the EL device with the complex bearing a benzo[b]tellurophene unit can give deep-red emission at ca. 636 nm with ηext of 6.3%, ηL of 6.5 cd A−1, and ηP of 5.8 lm W−1. This research not only provides novel (C^N)Pt(acac)-type complexes, but also furnishes critical information regarding the photophysical and EL behavior of these new complexes. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

182. Partial Ligand Stripping from CsPbBr3Nanocrystals Improves Their Performance in Light-Emitting Diodes

Author

Dai, Jinfei, Roshan, Hossein, De Franco, Manuela, Goldoni, Luca, De Boni, Francesco, Xi, Jun, Yuan, Fang, Dong, Hua, Wu, Zhaoxin, Di Stasio, Francesco, and Manna, Liberato

Abstract

Halide perovskite nanocrystals (NCs), specifically CsPbBr3, have attracted considerable interest due to their remarkable optical properties for optoelectronic devices. To achieve high-efficiency light-emitting diodes (LEDs) based on CsPbBr3nanocrystals (NCs), it is crucial to optimize both their photoluminescence quantum yield (PLQY) and carrier transport properties when they are deposited to form films on substrates. While the exchange of native ligands with didodecyl dimethylammonium bromide (DDAB) ligand pairs has been successful in boosting their PLQY, dense DDAB coverage on the surface of NCs should impede carrier transport and limit device efficiency. Following our previous work, here, we use oleyl phosphonic acid (OLPA) as a selective stripping agent to remove a fraction of DDAB from the NC surface and demonstrate that such stripping enhances carrier transport while maintaining a high PLQY. Through systematic optimization of OLPA dosage, we significantly improve the performance of CsPbBr3LEDs, achieving a maximum external quantum efficiency (EQE) of 15.1% at 516 nm and a maximum brightness of 5931 cd m–2. These findings underscore the potential of controlled ligand stripping to enhance the performance of CsPbBr3NC-based optoelectronic devices.

Published
2024
Full Text
View/download PDF

183. Graphitic carbon nitride doped SnO2 enabling efficient perovskite solar cells with PCEs exceeding 22%.

Author

Chen, Jinbo, Dong, Hua, Zhang, Lin, Li, Jingrui, Jia, Fuhao, Jiao, Bo, Xu, Jie, Hou, Xun, Liu, Jian, and Wu, Zhaoxin

Abstract

The energy level alignment and carrier mobility of the charge transport layer are of crucial importance for electron extraction and transport in planar heterojunction perovskite solar cells (PSCs). In this work, a carbon nitride modified SnO2 nanocomposite, SnO2/graphitic carbon nitride (g-C3N4) quantum dots, was designed as the functional electron transport layer (ETL) to precisely regulate the interfacial charge dynamics for high-performance PSCs. It is demonstrated that the g-C3N4 could recast the electronic density distribution around the neighboring SnO2 crystal unit, thus effectively eliminating the oxygen-vacancy-reduced trap centers and promoting the interface and bulk electron transport. Consequently, this carbon nitride modified SnO2 nanocomposite exhibits appropriate electrical properties including suitable energy level alignment and high conductivity. Employing the typical hybrid SnO2-based ETL, a maximum power conversion efficiency (PCE) of 22.13% (Voc = 1.176 V, Jsc = 24.03 mA cm−2, FF = 0.783) can be achieved for planar heterojunction PSCs, with negligible hysteresis and long-term stability (only 10% PCE decay after 1500 h at a relative humidity of 60%). Our work offers a hybrid ETL design strategy to improve the efficiency and stability of PSCs. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

193. High Efficiency Fluorescent Electroluminescence with Extremely Low Efficiency Roll-Off Generated by a Donor-Bianthracene-Acceptor Structure: Utilizing Perpendicular Twisted Intramolecular Charge Transfer Excited State

Author

Yu, Yue, primary, Ma, Lin, additional, Yang, Xiaolong, additional, Zhou, Huixin, additional, Qin, Hanlin, additional, Song, Jiangluqi, additional, Zhou, Guijiang, additional, Wang, Dongdong, additional, and Wu, Zhaoxin, additional

Published
2018
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results