Does interfacial exciton quenching exist in high-performance quantum dot light-emitting diodes?

被引：10

作者：

Qu, Xiangwei ^{[1
,2
,3
]}

Liu, Wenbo ^{[1
,2
,3
]}

Li, Depeng ^{[1
,2
,3
]}

Ma, Jingrui ^{[1
,2
,3
]}

Gu, Mi ^{[1
,2
,3
]}

Jia, Siqi ^{[1
,2
,3
]}

Xiang, Guohong ^{[1
,2
,3
]}

Sun, Xiao Wei ^{[1
,2
,3
]}

机构：

[1] Southern Univ Sci & Technol, Inst Nanosci & Applicat, Shenzhen 518055, Peoples R China

[2] Southern Univ Sci & Technol, Guangdong Univ Key Lab Adv Quantum Dot Displays &, Minist Educ, Key Lab Energy Convers & Storage Technol,Guangdong, Shenzhen 518055, Peoples R China

[3] Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

来源：

NANOSCALE | 2023年 / 15卷 / 07期

关键词：

EFFICIENCY; INJECTION;

D O I：

10.1039/d2nr07119c

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In quantum dot light-emitting diodes (QLEDs), even seemingly with interfacial exciton quenching between quantum dots (QDs) and the electron transport layer (ETL) limiting the device efficiency, the internal quantum efficiency of such QLEDs approaches 100%. Therefore, it is a puzzle that QLEDs exhibit high performance although they suffer from interfacial exciton quenching. In this work, we solve this puzzle by identifying the cause of the interfacial exciton quenching. By analyzing the optical characteristics of pristine and encapsulated QD-ETL films, the interfacial exciton quenching in the pristine QD-ETL film is attributed to O-2-induced charge transfer. We further investigate the charge transfer mechanism and its effect on the performance of QLEDs. Finally, we show the photodegradation of the pristine QD-ETL film under UV irradiation. Our work bridges interfacial exciton quenching and high performance in hybrid QLEDs and highlights the significance of encapsulation in QLEDs.

引用

页码：3430 / 3437

页数：8

共 25 条

[1] Highly stable QLEDs with improved hole injection via quantum dot structure tailoring [J].