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
Citations
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Journal ArticleDOI
Efficient Pure Blue Light-Emitting Diodes Based on CsPbBr3 Quantum-Confined Nanoplates.
Wei Shen,Ye Yu,Wenzhu Zhang,Yan-Feng Chen,Jianbin Zhang,Liu Yang,Jing Feng,Kang Cheng,Lihui Liu,Shufen Chen +9 more
TL;DR: In this paper , the authors proposed an alternate droplet/spin coating method to improve the coverage and thickness of NPL layer to prevent hole transport layer emission and increase the reproducibility of LED performance and spectra.
Journal ArticleDOI
CsPbBr3-MoS2-GO nanocomposites for boosting photocatalytic degradation performance
TL;DR: In this paper, MoS2-graphene oxide (GO) composite structure and synthesized CsPbBr3-MoS 2-GO nanocomposites by a two-step method.
Journal ArticleDOI
Luminance efficiency roll-off mechanism in CsPbBr3−xClx mixed-halide perovskite quantum dot blue light-emitting diodes
Young Ran Park,Hong Hee Kim,Sangwon Eom,Won Kook Choi,Hyosung Choi,Bo Ram Lee,Youngjong Kang +6 more
TL;DR: In this article, the authors reported CsPbBr3−xClx/PbBry (or PbCly) core/shell quantum dot LEDs exhibiting the emission peak spanning from λpeak = 492 to λ peak = 435 nm by varying the Cl composition (0 ≤ x ≤ 2.21).
Journal ArticleDOI
Engineering of perovskite light-emitting diodes based on quasi-2D perovskites formed by diamine cations
Chiung-Han Chen,Zhenchao Li,Qifan Xue,Yu-An Su,Chia-Chen Lee,Hin-Lap Yip,Wen-Chang Chen,Chu-Chen Chueh +7 more
TL;DR: In this paper, a series of DJ phase quasi-2D EDBE(MAPbBr3)n-1PbBr4 perovskites [EDBE: 2,2-(ethylenedioxy)bis(ethylammonium)] is developed and their application in PeLEDs is investigated.
Journal ArticleDOI
Single-particle electroluminescence of CsPbBr 3 perovskite nanocrystals reveals particle-selective recombination and blinking as key efficiency factors
TL;DR: Both individual and statistical PL and EL behaviors of these nanocrystals are studied and the origin of the lower EL efficiency is revealed and it is revealed that electroluminescence devices prepared from such NCs suffered from low external quantum efficiency.
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.