Carrier recombination spatial transfer by reduced potential barrier causes blue/red switchable luminescence in C8 carbon quantum dots/organic hybrid light-emitting devices

被引：7

作者：

Chen, Xifang

Yan, Ruolin

Zhang, Wenxia

Fan, Jiyang ^{[1
]}

机构：

[1] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China

来源：

APL MATERIALS | 2016年 / 4卷 / 04期

基金：

中国国家自然科学基金;

关键词：

HIGH-EFFICIENCY; WHITE-LIGHT; DIODES; DOTS; PERFORMANCE; ELECTROLUMINESCENCE; TRANSPORT; EXCIMER; SI;

D O I：

10.1063/1.4945722

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The underlying mechanism behind the blue/red color-switchable luminescence in the C-8 carbon quantum dots (CQDs)/organic hybrid light-emitting devices (LEDs) is investigated. The study shows that the increasing bias alters the energy-level spatial distribution and reduces the carrier potential barrier at the CQDs/organic layer interface, resulting in transition of the carrier transport mechanism from quantum tunneling to direct injection. This causes spatial shift of carrier recombination from the organic layer to the CQDs layer with resultant transition of electroluminescence from blue to red. By contrast, the pure CQDs-based LED exhibits green-red electroluminescence stemming from recombination of injected carriers in the CQDs. (C) 2016 Author(s).

引用

页数：9