journal article·2024-08-09

Efficient and Stable Pure-Red Perovskite LED Based on Uniform Arrangement Strongly Confined Quantum-Dot Film

Mingyuan Xie, Jie Guo, Chenghao Bi, Yong Zhang, Hangren Li, Lin Zhang, Linxing Zhang, Xiaoyu Zhang, Weitao Zheng, Jianjun Tian

ACS Energy Letters· Volume 9· Issue 8
Publisher page

Abstract

We reveal the nucleation and restriction growth of pure-red CsPbI 3 strongly confined quantum dots (SQDs). The iodine-rich precursor induced an iodine-rich surface on the CsPbI 3 crystals, preventing the absorption of [PbI 6 ] 4–, thus inhibiting the growth of crystals and improving the dimensional homogeneity of the SQDs. The Gaussian variance of the SQDs is only 0.01 nm, which is lower than 1 order of magnitude of the conventional QDs, demonstrating uniform crystal size distribution. Gaussian fitting and Chebyshev orientation parameter demonstrate a much higher degree of order in the SQD film than that in the conventional QD film. Thus, the uniform size and orderly arrangement of the SQDs endow their film with better electrical performance and stability. Light-emitting diode based on the SQDs manifested a pure-red electroluminescence peak at 635 nm, a brightness of 4609 cd/m 2, an external quantum efficiency of 25.4%, and a T 80 value of 268 min at 175 cd/m 2 .
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Research context

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Conducting polymers and applications

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

Affiliations

School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, No. 2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu 610054, China

Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

Key Laboratory of Automobile Materials Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun 130012, China

Qingdao Innovation and Development Base, Harbin Engineering University, Qingdao 266000, China

Center for Carbon-Based Electronics, Peking University, Beijing 100871, China

Funding

National Key Research and Development Program of China · Basic and Applied Basic Research Foundation of Guangdong Province · Beijing Municipal Natural Science Foundation · National Natural Science Foundation of China · Sichuan Provincial Regional Innovation Cooperation Project

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