DataVXACS NanoPaper
journal article·2025-08-12

Hard–Soft-Acid–Base Management Enabled Bright and Stable Pure-Blue Perovskite Quantum Dot LEDs

Mingyuan Xie, Hangren Li, Chenghao Bi, Shibo Wei, Sitian Chen, Yong Zhang, Ye Wang, Meng-Jiao Li, Ya-Kun Wang, Liang-Sheng Liao, Silu Tao

ACS Nano· Volume 19· Issue 31
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Source abstract

Abstract

Light-emitting diodes (LEDs) based on perovskite quantum dots (QDs) have achieved external quantum efficiencies (EQEs) exceeding 20% at a practical luminance (>1000 cd m –2 ) for real-world applications in the green and red regions. However, the pure-blue perovskite QD LEDs still suffer from low efficiency at high luminance: the EQE of the reported best device at 600 cd m –2 is below 7.0%. One of the limiting factors is weak ligand-surface binding because of the dynamic ligand-binding nature. In this work, we employ first-principles calculations to evaluate the hard–soft-acid–base interaction strength and search for the appropriate alkali metal ions to resolve this limiting factor. We found that rubidium ions have the most compatible softness with bromine dangling bonds in the strongly confined QDs, leading to stronger bonding. This strategy enabled the photoluminescence quantum yield of the QD film to be 81%. The low-defect QD films ensured efficient carrier recombination, enabling pure-blue perovskite QD LEDs to generate an EQE peak of 15.7% with a luminance of 3916 cd m –2, and the EQE remains at 14.9% under a higher luminance of 5371 cd m –2 . This represents an achieved record EQE × luminance: a 35-fold improvement compared to the best previous pure-blue perovskite LED.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

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 Avenue, West Hi-Tech Zone, Chengdu 610054, China

Institute for Advanced Materials and Technology

University of Science and Technology Beijing

College of Physics and Optoelectronic Engineering

Harbin Engineering University

Center for Carbon-Based Electronics

Peking University

Institute of Functional Nano and Soft Materials (FUNSOM), State Key Laboratory of Bioinspired Interfacial Materials Science, Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices

Soochow University

Funding

Suzhou Key Laboratory of Functional Nano and Soft Materials · Collaborative Innovation Center of Suzhou Nano Science and Technology · Natural Science Foundation of Heilongjiang Province · Natural Science Foundation of Sichuan Province · Natural Science Foundation of Hainan Province · Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China · Natural Science Foundation of Shandong Province · Higher Education Discipline Innovation Project · New Era Longjiang Excellent Doctoral Dissertation Project · Joint International Research Laboratory of Carbon-Based Functional Materials and Devices · Gusu Innovation and Entrepreneurship Leading Talent Program · Sichuan Provincial Regional Innovation Cooperation Project

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