journal article·2020-12

Multiple Cations Enhanced Defect Passivation of Blue Perovskite Quantum Dots Enabling Efficient Light‐Emitting Diodes

Jiangyong Pan, Zihan Zhao, Fan Fang, Lixi Wang, Guangzhao Wang, Chengjun Liu, Jing Chen, Jing Xie, Jiayun Sun, Kai Wang, Xiang Liu, Zhi Tao, Jianguo Zhao, Qinqin Wu, Jianhua Chang, Ye Wang, Wei Lei, Wei Zhang, Xiao Wei Sun, Dewei Zhao

Advanced Optical Materials· Volume 8· Issue 24
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Abstract

Abstract All inorganic perovskite quantum dots (ABX3, A = Cs, B = Pb, X = Cl, Br, or I) are potential candidates for wide‐color‐gamut display applications. High‐efficiency green and red perovskite quantum dot (PeQD) light‐emitting diodes (LEDs) have been achieved, however, development of blue‐emitting devices, especially those with the relatively short wavelengths (<470 nm) meeting National Television System Committee blue standard, lag largely behind, mainly due to poor film quality, low photoluminescence quantum yield (PLQY) of PeQDs, and unfavorable device structure. Here, a strategy of co‐doping Rb+ and Ni2+ in (Cs0.8Rb0.2)(Pb0.95Ni0.05)(Br1.8Cl1.2) PeQDs is reported to improve the film quality and PLQY of PeQDs by realizing multiple passivations and modifying the energy band of PeQDs to reduce the hole injection barrier. With further engineering the device structure to facilitate the hole transport, PeQDLEDs based on multiple‐cation PeQDs show the maximum EQE of 2.14% and the emission peak at 467 nm with a full width at half maximum of 16 nm. This work would open up a new avenue to design and develop efficient blue‐emitting materials for high‐performance blue PeQDLEDs.
Source: crossref · Quality: baseline

Research context

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 Electronic 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

Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting Department of Electrical and Electronic Engineering Southern University of Science and Technology (SUSTech) Shenzhen 518055 China

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

Key Laboratory of Material Physics of Ministry of Education School of Physics and Microelectronics Zhengzhou University Zhengzhou 450052 China

Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. Shenzhen 518132 China

Institute of Solar Energy Materials and Devices College of Materials Science and Engineering Sichuan University Chengdu 610065 China

Funding

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

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