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
Organic cation directed one-dimensional cuprous halide compounds: syntheses, crystal structures and photoluminescence properties.
Cheng-Yang Yue,Cheng-Yang Yue,Na Lin,Lu Gao,Ying-Xue Jin,Zhao-Yang Liu,Yao-Yao Cao,Sha-Sha Han,Xi-Kai Lian,Bing Hu,Xiao-Wu Lei,Xiao-Wu Lei +11 more
TL;DR: These hybrid cuprous halides feature one-dimensional (1D) [CuI2]-, [Cu2I3]- and [Cu3X5]2- (X = Br, I) chains surrounded and charge-balanced by organic cations.
Journal ArticleDOI
Accurate Efficiency Measurements of Organic Light‐Emitting Diodes via Angle‐Resolved Spectroscopy
Emily Archer,Sabina Hillebrandt,Chang-Min Keum,Caroline Murawski,Jan Murawski,Francisco Tenopala-Carmona,Malte C. Gather,Malte C. Gather +7 more
Journal ArticleDOI
Nanocrystalline Polymorphic Energy Funnels for Efficient and Stable Perovskite Light-Emitting Diodes
Do-Kyoung Lee,Yunseop Shin,Ho Jin Jang,Joo Hong Lee,Keon-Woo Park,Woochan Lee,Seunghyup Yoo,Jun Yeob Lee,Dongho Kim,Jin-Wook Lee,Nam-Gyu Park +10 more
TL;DR: In this article, charge carrier confinement in nanocrystals is an effective route to enhance luminescence efficiency of metal halide perovskites, however, difficulty in handling surface ligands of colloidal perovkites is encountered.
Journal ArticleDOI
Exciton recombination mechanisms in solution grown single crystalline CsPbBr3 perovskite
TL;DR: In this article, the excitonic photoluminescence properties of all-inorganic perovskite CsPbBr3 were investigated in detail via temperature-dependent PL and Raman spectroscopy in the range of 87-K-297-K.
Journal ArticleDOI
CsPbBr3@Cs4PbBr6 Emitter-in-Host Composite: Fluorescence Origin and Interphase Energy Transfer
TL;DR: Although the superior halide perovskite (HP) nanocrystals have garnered considerable research passion in recent years, their practical use is still dauntingly plagued by the instability issue as mentioned in this paper.
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.