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
Large‐Area and Efficient Sky‐Blue Perovskite Light‐Emitting Diodes via Blade‐Coating
Sheng-Yuan Chu,Yihan Zhang,Peng Xiao,Wenjing Chen,Rongfeng Tang,Y. Shao,Tao Chen,Xiaoqiang Zhang,Fengguang Liu,Zhengguo Xiao +9 more
TL;DR: In this article , the volume ratio of dimethyl sulfoxide to dimethylformamide is tuned to obtain a supersaturated CsPb(Br0.84Cl0.16)3 solution.
Journal ArticleDOI
Improving the efficiency of perovskite light emitting diode using polyvinylpyrrolidone as an interlayer
Yunho Ahn,Seungjun Lee,Do-Hyung Kwak,Myeongseop Kim,Dae Yeong Kim,Jungwon Kim,Yongsup Park,Min Chul Suh +7 more
TL;DR: In this article, a polyvinylpyrrolidone (PVP) interlayer between PEDOT:PSS anode and active layer was introduced in a perovskite light-emitting diode (PeLED) in conjunction with nanocrystal pinning (NCP) process.
Journal ArticleDOI
Suppressing Auger Recombination of Perovskite Quantum Dots for Efficient Pure-Blue-Light-Emitting Diodes
Chenghao Bi,Zhiwei Yao,Jingcong Hu,Xingyu Wang,Mengqi Zhang,Shuyu Tian,Aqiang Liu,Yue Lu,Nora H. de Leeuw,Manling Sui,Jianjun Tian +10 more
TL;DR: In this article , a pure-blue perovskite light-emitting diodes (PeLEDs) with high efficiency and stability was reported, with a full width at half-maximum of 21 nm, high external quantum efficiency of 10.3%, luminance of 12 060 cd m-2, and continuous operation half-life of 25 h.
Journal ArticleDOI
Improved performance of flexible perovskite light-emitting diodes with modified PEDOT:PSS hole transport layer
TL;DR: In this article, a flexible perovskite light-emitting diodes (PeLEDs) on indium-tin oxide coated poly(ethylene terephthalate) (ITO/PET) substrates by using modified poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)(PEDOT:PSS) as a hole transport layer (HTL).
Journal ArticleDOI
Embedding of Ti 3 C 2 T x Nanocrystals in MAPbI 3 Microwires for Improved Responsivity and Detectivity of Photodetector
Hang Guo,Hang Guo,Hongyue Wang,Haibo Fan,Qian Ye,Jin Zhang,Fengren Cao,Liang Li,Yu Tong,Hongqiang Wang +9 more
TL;DR: In this article, the defect-assisted nonradiative recombination is harmful for carrier transport, which limits the performances improvement of photodetectors (PDs) and also reduces the mobility of overall film based on perovskite microwires.
References
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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
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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.