Interfacial Charge Modulation: An Efficient Strategy for Stable Blue Quantum‐Dot Light‐Emitting Diodes. Issue 2 (20th November 2022)

• Record Type: Journal Article
• Authors: Liang, Shanshan; Wang, Shujie; Wu, Ziho; Wen, Bo; Cai, Guofa; Jiang, Xiaohong; Huang, Guangguang; Li, Chenguang; Zhao, Yaolong; Du, Zuliang
• Is Part Of: Advanced optical materials. Volume 11:Issue 2(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-11-20
• Subjects: blue quantum‐dot light‐emitting diodes -- electron transport layer -- interface modification -- monolayer Ti 3C 2T x; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202201802
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Quantum‐dot light‐emitting diodes (QLEDs) are proposed as one of the most promising candidates for next‐generation displays, but their commercial application is seriously limited due to the poor performance of blue QLEDs (B‐QLEDs). Herein, this work uses Ti3 C2 Tx nanosheets to tune the work function (WF) of ZnMgO and to engineer the quantum dot (QD)/electron transport layer (ETL) interface. The B‐QLEDs with ZnMgO‐Ti3 C2 Tx hybrid ETL exhibit a maximum EQE of 15.81% and a remarkable T50 operation lifetime of 3284 h at 100 cd m −2 . In addition to that, ultraviolet photoemission spectroscopy and density functional theory calculations both confirm that the addition of Ti3 C2 Tx to ZnMgO can effectively tune the ZnMgO's work function, further give rise to the reduction of QD/ETL energy barrier, which finally results in the alleviation of charge accumulation at the QD/ETL interface. The findings of interface engineering by Ti3 C2 Tx not only provide a promising strategy for the application of 2D materials in optoelectronic devices, but also pave the way to construct high‐performance light‐emitting diodes. Abstract : A stable and efficient blue quantum‐dot light‐emitting diode is achieved by using ZnMgO‐Ti3 C2 Tx as electron transport layer (ETL). The addition of Ti3 C2 Tx to ZnMgO can effectively tune the ZnMgO's work functions, further give rise to the reduction of quantum dot (QD)/ETL energy barrier, which finally results in the alleviation of charge accumulation at the QD/ETL interface.