Journal ArticleDOI
Perovskite light-emitting diodes based on spontaneously formed submicrometre-scale structures
Yu Cao,Nana Wang,He Tian,Jingshu Guo,Yingqiang Wei,Hong Chen,Yanfeng Miao,Wei Zou,Kang Pan,Yarong He,Hui Cao,You Ke,Mengmeng Xu,Ying Wang,Ming Yang,Kai Du,Zewu Fu,Decheng Kong,Daoxin Dai,Yizheng Jin,Gongqiang Li,Hai Li,Qiming Peng,Jianpu Wang,Wei Huang,Wei Huang,Wei Huang +26 more
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TLDR
The formation of submicrometre-scale structure in perovskite light-emitting diodes can raise their external quantum efficiency beyond 20%, suggesting the possibility of both high efficiency and high brightness.Abstract:
Light-emitting diodes (LEDs), which convert electricity to light, are widely used in modern society—for example, in lighting, flat-panel displays, medical devices and many other situations. Generally, the efficiency of LEDs is limited by nonradiative recombination (whereby charge carriers recombine without releasing photons) and light trapping1–3. In planar LEDs, such as organic LEDs, around 70 to 80 per cent of the light generated from the emitters is trapped in the device4,5, leaving considerable opportunity for improvements in efficiency. Many methods, including the use of diffraction gratings, low-index grids and buckling patterns, have been used to extract the light trapped in LEDs6–9. However, these methods usually involve complicated fabrication processes and can distort the light-output spectrum and directionality6,7. Here we demonstrate efficient and high-brightness electroluminescence from solution-processed perovskites that spontaneously form submicrometre-scale structures, which can efficiently extract light from the device and retain wavelength- and viewing-angle-independent electroluminescence. These perovskites are formed simply by introducing amino-acid additives into the perovskite precursor solutions. Moreover, the additives can effectively passivate perovskite surface defects and reduce nonradiative recombination. Perovskite LEDs with a peak external quantum efficiency of 20.7 per cent (at a current density of 18 milliamperes per square centimetre) and an energy-conversion efficiency of 12 per cent (at a high current density of 100 milliamperes per square centimetre) can be achieved—values that approach those of the best-performing organic LEDs. The formation of submicrometre-scale structure in perovskite light-emitting diodes can raise their external quantum efficiency beyond 20%, suggesting the possibility of both high efficiency and high brightness.read more
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Journal ArticleDOI
Engineering of Annealing and Surface Passivation toward Efficient and Stable Quasi-2D Perovskite Light-Emitting Diodes.
Yunxing Fu,Yunxing Fu,Dezhong Zhang,Hongmei Zhan,Chenyang Zhao,Yanxiang Cheng,Chuanjiang Qin,Chuanjiang Qin,Lixiang Wang +8 more
TL;DR: In this article, the authors explored the correlation among the annealing time, the external quantum efficiency (EQE), and the operational stability of the solution-processed quasi-two-dimensional (quasi-2D) perovskites with self-assembled multiple quantum well structures.
Journal ArticleDOI
High-Luminance Microsized CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Single-Crystal-Based Light-Emitting Diodes via a Facile Liquid-Insulator Bridging Route
Jiansheng Jie,John M. Blain +1 more
TL;DR: In this article , a liquid-insulator bridging (LIB) strategy was proposed to fabricate high-luminance perovskite LEDs based on single-crystalline CH3NH3PbBr3 microflakes.
Journal ArticleDOI
Multiple-engineering controlled growth of tunable-bandgap perovskite nanowires for high performance photodetectors
Kuankuan Ren,Jian Wang,Kong Liu,Yanbin Huang,Yang Sun,Muhammad Azam,Peng Jin,Zhijie Wang,Shengchun Qu,Zhanguo Wang +9 more
TL;DR: In this paper, an electrochemical method for growing perovskite nanowires and studying the growth processes systematically was developed, where the initial nucleation and crystal growth could be controlled by simply varying the additive solvents.
Journal ArticleDOI
Enantiomeric pair of 2D organic-inorganic hybrid perovskites with circularly polarized luminescence and photoelectric effects
Xuan Zhao,Xiaozong Hu,Meng-En Sun,Xi-Ming Luo,Chong Zhang,Gao-Song Chen,Xi-Yan Dong,Shuang-Quan Zang +7 more
TL;DR: Chiral 2D organic-inorganic hybrid perovskites (OIHPs) attract increasing interest due to the potential applications in spintronic, and optoelectronic devices as mentioned in this paper .
Journal ArticleDOI
A donor-acceptor ligand boosting the performance of FA0.8Cs0.2PbBr3 nanocrystal light-emitting diodes.
Wei Shen,Yao Lu,Pengfei Xia,Wenzhu Zhang,Yanfeng Chen,Wei Wang,Yanan Wu,Lihui Liu,Shufen Chen +8 more
TL;DR: A donor-acceptor ligand, 3-amino-2-bromo-6-methoxypyridine (ABMeoPy), was introduced to passivate FA0.8Cs0.2PbBr3 nanocrystals (NCs) by a post-processing method as discussed by the authors.
References
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Journal ArticleDOI
Bright light-emitting diodes based on organometal halide perovskite
Zhi-Kuang Tan,Reza Saberi Moghaddam,May Ling Lai,Pablo Docampo,Ruben Higler,Felix Deschler,Michael Price,Aditya Sadhanala,Luis M. Pazos,Dan Credgington,Fabian C. Hanusch,Thomas Bein,Henry J. Snaith,Richard H. Friend +13 more
TL;DR: It is shown, using photoluminescence studies, that radiative bimolecular recombination is dominant at higher excitation densities, Hence, the quantum efficiencies of the perovskite light-emitting diodes increase at higher current densities.
Journal ArticleDOI
A hole-conductor-free, fully printable mesoscopic perovskite solar cell with high stability
Anyi Mei,Xiong Li,Linfeng Liu,Zhiliang Ku,Tongfa Liu,Yaoguang Rong,Mi Xu,Min Hu,Jiangzhao Chen,Ying Yang,Michael Grätzel,Hongwei Han +11 more
TL;DR: A perovskite solar cell that uses a double layer of mesoporous TiO2 and ZrO2 as a scaffold infiltrated with perovSkite and does not require a hole-conducting layer is fabricated and achieves a certified power conversion efficiency of 12.8%.
Journal ArticleDOI
Solution-processed, high-performance light-emitting diodes based on quantum dots
Xingliang Dai,Zhenxing Zhang,Yizheng Jin,Yuan Niu,Hujia Cao,Xiaoyong Liang,Liwei Chen,Jianpu Wang,Xiaogang Peng +8 more
TL;DR: This optoelectronic performance is achieved by inserting an insulating layer between the quantum dot layer and the oxide electron-transport layer to optimize charge balance in the device and preserve the superior emissive properties of the quantum dots.
Journal ArticleDOI
A Universal Method to Produce Low―Work Function Electrodes for Organic Electronics
Yinhua Zhou,Canek Fuentes-Hernandez,Jae Won Shim,Jens Meyer,Anthony J. Giordano,Hong Li,Paul Winget,Theodoros A. Papadopoulos,Hyeunseok Cheun,Jungbae Kim,Mathieu Fenoll,Mathieu Fenoll,Amir Dindar,Wojciech Haske,Ehsan Najafabadi,Talha M. Khan,Hossein Sojoudi,Stephen Barlow,Samuel Graham,Jean-Luc Brédas,Seth R. Marder,Antoine Kahn,Bernard Kippelen +22 more
TL;DR: It is shown that surface modifiers based on polymers containing simple aliphatic amine groups substantially reduce the work function of conductors including metals, transparent conductive metal oxides, conducting polymers, and graphene.