DataVXAdvanced MaterialsPaper
journal article·2021-04

Perovskite Light‐Emitting Diodes with Near Unit Internal Quantum Efficiency at Low Temperatures

Yarong He, Jiaxu Yan, Lei Xu, Bangmin Zhang, Qian Cheng, Yu Cao, Ju Zhang, Cong Tao, Yingqiang Wei, Kaichuan Wen, Zhiyuan Kuang, Gan Moog Chow, Zexiang Shen, Qiming Peng, Wei Huang, Jianpu Wang

Advanced Materials· Volume 33· Issue 14
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Source abstract

Abstract

Abstract Room‐temperature‐high‐efficiency light‐emitting diodes based on metal halide perovskite FAPbI3 are shown to be able to work perfectly at low temperatures. A peak external quantum efficiency (EQE) of 32.8%, corresponding to an internal quantum efficiency of 100%, is achieved at 45 K. Importantly, the devices show almost no degradation after working at a constant current density of 200 mA m−2 for 330 h. The enhanced EQEs at low temperatures result from the increased photoluminescence quantum efficiencies of the perovskite, which is caused by the increased radiative recombination rate. Spectroscopic and calculation results suggest that the phase transitions of the FAPbI3 play an important role for the enhancement of exciton binding energy, which increases the recombination rate.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China

Department of Materials Science and Engineering National University of Singapore Singapore 117575 Singapore

Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore

Frontiers Science Center for Flexible Electronics (FSCFE) Shaanxi Institute of Flexible Electronics (SIFE) and Shaanxi Institute of Biomedical Materials and Engineering (SIBME) Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an 710072 China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Jiangsu Province

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