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
收藏
页数:9
相关论文
共 42 条
[21]   Colloidal Graphene Quantum Dots [J].
Li, Liang-shi ;
Yan, Xin .
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 2010, 1 (17) :2572-2576
[22]   White organic light-emitting devices with CdSe/ZnS quantum dots as a red emitter [J].
Li, YQ ;
Rizzo, A ;
Mazzeo, M ;
Carbone, L ;
Manna, L ;
Cingolani, R ;
Gigli, G .
JOURNAL OF APPLIED PHYSICS, 2005, 97 (11)
[23]   Micro- and nanocubes of carbon with C8-like and blue luminescence [J].
Liu, P. ;
Cao, Y. L. ;
Wang, C. X. ;
Chen, X. Y. ;
Yang, G. W. .
NANO LETTERS, 2008, 8 (08) :2570-2575
[24]  
Mashford BS, 2013, NAT PHOTONICS, V7, P407, DOI [10.1038/NPHOTON.2013.70, 10.1038/nphoton.2013.70]
[25]   'Giant' CdSe/CdS Core/Shell Nanocrystal Quantum Dots As Efficient Electroluminescent Materials: Strong Influence of Shell Thickness on Light-Emitting Diode Performance [J].
Pal, Bhola N. ;
Ghosh, Yagnaseni ;
Brovelli, Sergio ;
Laocharoensuk, Rawiwan ;
Klimov, Victor I. ;
Hollingsworth, Jennifer A. ;
Htoon, Han .
NANO LETTERS, 2012, 12 (01) :331-336
[26]  
Parker D., 1994, J APPL PHYS, V75, P1656
[27]   High-Efficiency, Low Turn-on Voltage Blue-Violet Quantum-Dot-Based Light-Emitting Diodes [J].
Shen, Huaibin ;
Cao, Weiran ;
Shewmon, Nathan T. ;
Yang, Chenchen ;
Li, Lin Song ;
Xue, Jiangeng .
NANO LETTERS, 2015, 15 (02) :1211-1216
[28]   Emergence of colloidal quantum-dot light-emitting technologies [J].
Shirasaki, Yasuhiro ;
Supran, Geoffrey J. ;
Bawendi, Moungi G. ;
Bulovic, Vladimir .
NATURE PHOTONICS, 2013, 7 (01) :13-23
[29]   Quantum Dot Light-Emitting Diodes Based on Inorganic Perovskite Cesium Lead Halides (CsPbX3) [J].
Song, Jizhong ;
Li, Jianhai ;
Li, Xiaoming ;
Xu, Leimeng ;
Dong, Yuhui ;
Zeng, Haibo .
ADVANCED MATERIALS, 2015, 27 (44) :7162-+
[30]   High color rendering index white light emitting diodes fabricated from a combination of carbon dots and zinc copper indium sulfide quantum dots [J].
Sun, Chun ;
Zhang, Yu ;
Wang, Yu ;
Liu, Wenyan ;
Kalytchuk, Sergii ;
Kershaw, Stephen V. ;
Zhang, Tieqiang ;
Zhang, Xiaoyu ;
Zhao, Jun ;
Yu, William W. ;
Rogach, Andrey L. .
APPLIED PHYSICS LETTERS, 2014, 104 (26)