Improved Luminous Efficiency of AgInS 2 Quantum Dots and Zeolitic Imidazolate Framework‐70 Composite for White Light Emitting Diode Applications

作者：Zhe Qin, Yuanhong Chen, Ting Chen, Mengbiao Liang, Wen Peng, Chunxian Guo, Changqing Ye, Zhixiang Xie · 发表于：Chemistry - A European Journal · 年份：2023 · DOI：10.1002/chem.202301123 · 被引用次数：2 · 研究领域：ZnO doping and properties、Carbon and Quantum Dots Applications、Advanced Photocatalysis Techniques

Abstract The application of multiple quantum dots (QDs) in the field of white light emitting diodes (WLEDs) is still an important challenge due to their low luminous efficiency and quenching phenomenon. In this paper, we prepared AgInS 2 QDs/zeolitic imidazolate framework‐70 (AIS/ZIF‐70) composite by a microwave hydrothermal method. Owing to the high porosity and stability of ZIF‐70, it could effectively prevent quenching issues due to the aggregation of QDs. Since the ZIF‐70 and QDs were chemically bonded, the formation of the ZnS layer could effectively passivate the surface defect and thus the quantum yield reached 21.49 % in aqueous solution. The luminous efficiency (LE) of the assembled AIS/ZIF‐based WLED was reinforced by 6.8 times with a molar ratio of AgIn/Zn=18, i. e. at 5.26 % molar fraction of ZIF‐70. Moreover, the color rendering index (CRI) and correlated color temperature (CCT) of AIS/ZIF‐based WLED were 84.3 and 3631 K, respectively, indicating its potential application in solid‐state lighting.