Ultrastable and High-Efficiency Deep Red QLEDs through Giant Continuously Graded Colloidal Quantum Dots with Shell Engineering

被引：28

作者：

Liu, Xiaonan ^{[1
]}

Wang, Lei ^{[2
]}

Gao, Yan ^{[2
]}

Zeng, Yicheng ^{[1
]}

Liu, Fangze ^{[3
]}

Shen, Huaibin ^{[2
]}

Manna, Liberato ^{[3
,4
]}

Li, Hongbo ^{[1
]}

机构：

[1] Beijing Inst Technol, Sch Mat Sci & Engn, Expt Ctr Adv Mat, Beijing Key Lab Construct Tailorable Adv Funct Mat, Beijing 100081, Peoples R China

[2] Henan Univ, Minist Educ, Key Lab Special Funct Mat, Natl & Local Joint Engn Res Ctr High Efficiency Di, Kaifeng 475004, Peoples R China

[3] Beijing Inst Technol, Adv Res Inst Multidisciplinary Sci, Beijing 100081, Peoples R China

[4] Ist Italiano Tecnol, Nanochem Dept, I-16163 Genoa, Italy

来源：

NANO LETTERS | 2023年 / 23卷 / 14期

基金：

中国国家自然科学基金;

关键词：

continuously graded quantum dots; light-emitting diodes; stability; deep red; efficiency; LIGHT-EMITTING-DIODES; AUGER RECOMBINATION; ELECTROLUMINESCENT DEVICES; CORE/SHELL NANOCRYSTALS; HIGH-BRIGHTNESS; CDSE; PERFORMANCE; INJECTION; STRATEGY; GROWTH;

D O I：

10.1021/acs.nanolett.3c01919

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Quantum dot (QD) based light-emitting diodes (QLEDs)hold greatpromise for next-generation lighting and displays. In order to reacha wide color gamut, deep red QLEDs emitting at wavelengths beyond630 nm are highly desirable but have rarely been reported. Here, wesynthesized deep red emitting ZnCdSe/ZnSeS QDs (diameter & SIM;16nm) with a continuous gradient bialloyed core-shell structure.These QDs exhibit high quantum yield, excellent stability, and a reducedhole injection barrier. The QLEDs based on ZnCdSe/ZnSeS QDs have anexternal quantum efficiency above 20% in the luminance range of 200-90000cd m(-2) and a record T (95) operation lifetime (time for the luminance to decrease to 95% ofits initial value) of more than 20000 h at a luminance of 1000 cdm(-2). Furthermore, the ZnCdSe/ZnSeS QLEDs have outstandingshelf stability (>100 days) and cycle stability (>10 cycles).Thereported QLEDs with excellent stability and durability can acceleratethe pace of QLED applications.

引用

页码：6689 / 6697

页数：9

共 67 条

[1] Direct Observation of Rapid Discrete Spectral Dynamics in Single Colloidal CdSe-CdS Core-Shell Quantum Dots [J].