DataVXAdvanced Optical MaterialsPaper
journal article·2022-05

A Synergetic Codoping Strategy Enabling Performance Improvement of Pure‐Blue Perovskite Quantum Dots Light‐Emitting Diodes

Jiangyong Pan, Zihan Zhao, Fan Fang, Lixi Wang, Guangzhao Wang, Chengjun Liu, Qianqian Huang, Jinyi Sun, Yuling Huang, Lei Mao, Jing Xie, Ying Xue, Jing Chen, Wei Lei

Advanced Optical Materials· Volume 10· Issue 9
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Source abstract

Abstract

Abstract Highly efficient green and red perovskite quantum dots (PeQDs) light‐emitting diodes (PeQDLEDs) have been achieved. However, blue PeQDLEDs, especially those with the relatively short wavelengths (<470 nm) meeting National Television System Committee blue standard, have struggled to match the high efficiency and stability of their red and green counterparts. The main critical problems are the low photoluminescence quantum yield (PLQY) and poor stability of PeQDs, as well as the unfavorable device structure. Herein, a strategy of codoping Mn2+ and Ni2+ in CsPb(Br1.8Cl1.2) is developed to improve the PLQY and thermal stability of PeQDs due to the defect passivation and enhanced formation energy. Meanwhile, the valence band position of PeQDs is elevated to reduce the hole injection barrier benefitting from the synergetic codoping strategy. As a result, the PeQDLEDs based on codoped PeQDs exhibit the maximum external quantum efficiency (EQE) of 3.31% with the emission peak located at 469 nm, and lifetime exceeding 8 min. The work provides a new avenue to achieve efficient and stable pure blue PeQDLEDs.
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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

School of Electronics and Information Engineering Nanjing University of Information Science & Technology Nanjing 210044 China

Joint International Research Laboratory of Information Display and Visualization School of Electronic Science and Engineering Southeast University Nanjing 210096 China

Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology of Chongqing School of Electronic Information Engineering Yangtze Normal University Chongqing 408100 China

School of Electrical Computer and Energy Engineering Arizona State University Tempe AZ 85287 USA

Department of Chemical and Biomolecular Engineering The Ohio State University Columbus OH 43210 USA

Funding

Natural Science Foundation of Jiangsu Province · National Key Research and Development Program of China · Fundamental Research Funds for the Central Universities · Priority Academic Program Development of Jiangsu Higher Education Institutions

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