DataVXAdvanced Functional MaterialsPaper
journal article·2020-05

Low Roll‐Off Perovskite Quantum Dot Light‐Emitting Diodes Achieved by Augmenting Hole Mobility

Yu Wang, Yu Teng, Po Lu, Xinyu Shen, Pei Jia, Min Lu, Zhifeng Shi, Bin Dong, William W. Yu, Yu Zhang

Advanced Functional Materials· Volume 30· Issue 19
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Source abstract

Abstract

Abstract The external quantum efficiencies (EQEs) of perovskite quantum dot light‐emitting diodes (QD‐LEDs) are close to the out‐coupling efficiency limitation. However, these high‐performance QD‐LEDs still suffer from a serious issue of efficiency roll‐off at high current density. More injected carriers produce photons less efficiently, strongly suggesting the variation of ratio between radiative and non‐radiative recombination. An approach is proposed to balance the carrier distribution and achieve high EQE at high current density. The average interdot distance between QDs is reduced and this facilitates carrier transport in QD films and thus electrons and holes have a balanced distribution in QD layers. Such encouraging results augment the proportion of radiative recombination, make devices with peak EQE of 12.7%, and present a great device performance at high current density with an EQE roll‐off of 11% at 500 mA cm−2 (the lowest roll‐off known so far) where the EQE is still over 11%.
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Research context

Electronic materials

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

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

Affiliations

State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun 130012 China

College of Physics Jilin University Changchun 130012 China

Key Laboratory of Materials Physics of Ministry of Education Department of Physics and Engineering Zhengzhou University Zhengzhou 450052 China

Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission Key Laboratory of Photosensitive Materials & Devices of Liaoning Province School of Physics and Materials Engineering Dalian Nationalities University Dalian 116600 China

Department of Chemistry and Physics Louisiana State University Shreveport LA 71115 USA

Funding

National Natural Science Foundation of China · National Basic Research Program of China

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