Highly enhanced Quantum dot light-emitting diode performance by controlling energy resonance in inorganic insertion layers

量子点 光电子学 发光二极管 二极管 共振(粒子物理) 材料科学 能量(信号处理) 物理 原子物理学 量子力学
作者
Zongyi Meng,Zunxian Yang,Yuliang Ye,Zhen Zeng,Hongyi Hong,Songwei Ye,Zhiming Cheng,Qianting Lan,Li Wang,Ye Chen,Hui Zhang,Y. Bai,Xudong Jiang,Benfang Liu,Jae Won Hong,Tailiang Guo,Fushan Li,Yongyi Chen,Zhenzhen Weng
出处
期刊:Optical Materials [Elsevier BV]
卷期号:152: 115510-115510
标识
DOI:10.1016/j.optmat.2024.115510
摘要

Quantum-dot light-emitting diodes (QLED) have become a research trend in the field of new displays due to their low cost, wide color gamut, narrow bandwidth, and characteristics that enable production through the solution-gel method. However, the electrical performance of QLED is consistently constrained by energy losses and imbalanced charge carrier injection. This motivates our focus on exciton recombination and energy losses within the quantum-dot layer to enhance the electrical efficiency of QLED. In this work, we introduce a method using a CdZnS quantum dot (B-QD) interlayer to modulate energy transfer and charge carrier transport in QLED devices employing CdSe quantum dot (G-QD) as the emissive layer. By strategically incorporating a B-QD layer between the G-QD and HTL/ETL, we facilitate energy transfer due to the overlap between the excitation wavelength of B-QD and the absorption wavelength of G-QDs. This leads to enhanced energy injection in QLED devices, resulting in a high current efficiency of 39.54 Cd/A and a peak brightness of 522,272 cd/m2 for efficient QLED. The corresponding external quantum efficiency (EQE) is greatly improved from 5.62 % to 9.4 %. Our work provides a straightforward and effective approach to modulate exciton recombination and energy injection and further can be applicable to other photo-electronics devices.
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