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Highly efficient single-layer color-tunable QLEDs enables by the real-time interface exciplex modulation with AgInZnS QDs

Tianjun Hu,Xiuting Wu,Qingsong Shan,Xingxing Duan,Xiaoyue Cai,Mengjin Huang,Junhui Dai,Hong Zhong,Beichen Yuan,Hengyang Xiang,Linxiang Yang,Qiangyu Dai,Yuhao Zhang,Jiangshan Chen,Haibo Zeng

Developing single-pixel color-tunable electroluminescence technology represents a practical approach to circumvent current limitations in pixel processing and longevity. However, existing single-pixel color-tunable quantum dot light-emitting diodes (QLEDs) devices predominantly employ complex tandem structures. Herein, we demonstrate single-layer color-tunable QLEDs by the real-time interface exciplex modulation with AgInZnS (AIZS) quantum dots (QDs). The dynamically color-tunable QLEDs based on green- and red-emitting AIZS QDs exhibit broad spectral coverage, spanning from green to blue, red to yellow, with standard white emission, respectively. The fabricated devices achieve a leading maximum external quantum efficiency of 5% for quaternary alloy AIZS-based QLEDs. Furthermore, we successfully demonstrate patterned and large-area QLEDs, systematically confirming their significant potential for application in full-color display and lighting technologies.