Efficient inverted quantum-dot light-emitting devices with TiO2/ZnO bilayer as the electron contact layer

被引：30
作者：
Xu, Wei [1 ,2 ]
Ji, Wenyu [1 ]
Jing, Pengtao [1 ]
Yuan, Xi [1 ,2 ]
Wang, Y. A. [3 ]
Xiang, Weidong [4 ]
Zhao, Jialong [1 ,5 ]
机构：
[1] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, State Key Lab Luminescence & Applicat, Changchun 130033, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China
[3] Ocean NanoTech LLC, Springdale, AR 72764 USA
[4] Wenzhou Univ, Coll Chem & Mat Engn, Wenzhou 325035, Peoples R China
[5] Wenzhou Univ, Coll Mech & Elect Engn, Wenzhou 325035, Peoples R China
来源：
OPTICS LETTERS | 2014年 / 39卷 / 03期
基金：
中国国家自然科学基金;
关键词：
DIODES; NANOCRYSTALS; SUPPRESSION; INJECTION;
D O I：
10.1364/OL.39.000426
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We have demonstrated an efficient inverted CdSe/CdS/ZnS core/shell quantum-dot light-emitting device (QD-LED) using a solution-processed sol-gel TiO2 and ZnO nanoparticle composite layer as an electron-injection layer with controllable morphology and investigated the electroluminescence mechanism. The introduction of the ZnO layer can lead to the formation of spin-coated uniform QD films and fabrication of high-luminance QD-LEDs. The TiO2 layer improves the balance of charge injection due to its lower electron mobility relative to the ZnO layer. These results offer a practicable platform for the realization of a trade-off between the luminance and efficiency in the inverted QD-LEDs with TiO2/ZnO composites as the electron contact layer. (C) 2014 Optical Society of America
引用
收藏
页码：426 / 429
页数：4
相关论文
共 22 条
  • [1] Space-charge limited conduction with traps in poly(phenylene vinylene) light emitting diodes
    Campbell, AJ
    Bradley, DDC
    Lidzey, DG
    [J]. JOURNAL OF APPLIED PHYSICS, 1997, 82 (12) : 6326 - 6342
  • [2] NiO as an inorganic hole-transporting layer in quantum-dot light-emitting devices
    Caruge, Jean-Michel
    Halpert, Jonathan E.
    Bulovic, Vladimir
    Bawendi, Moungi G.
    [J]. NANO LETTERS, 2006, 6 (12) : 2991 - 2994
  • [3] Trilayer hybrid polymer-quantum dot light-emitting diodes
    Chaudhary, S
    Ozkan, M
    Chan, WCW
    [J]. APPLIED PHYSICS LETTERS, 2004, 84 (15) : 2925 - 2927
  • [4] Auger Recombination Suppression in Nanocrystals with Asymmetric Electron-Hole Confinement
    Climente, Juan I.
    Movilla, Jose L.
    Planelles, Josep
    [J]. SMALL, 2012, 8 (05) : 754 - 759
  • [5] Electroluminescence from single monolayers of nanocrystals in molecular organic devices
    Coe, S
    Woo, WK
    Bawendi, M
    Bulovic, V
    [J]. NATURE, 2002, 420 (6917) : 800 - 803
  • [6] Suppression of Auger Processes in Confined Structures
    Cragg, George E.
    Efros, Alexander L.
    [J]. NANO LETTERS, 2010, 10 (01) : 313 - 317
  • [7] New Insights into the Complexities of Shell Growth and the Strong Influence of Particle Volume in Nonblinking "Giant" Core/Shell Nanocrystal Quantum Dots
    Ghosh, Yagnaseni
    Mangum, Benjamin D.
    Casson, Joanna L.
    Williams, Darrick J.
    Htoon, Han
    Hollingsworth, Jennifer A.
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2012, 134 (23) : 9634 - 9643
  • [8] High color purity ZnSe/ZnS core/shell quantum dot based blue light emitting diodes with an inverted device structure
    Ji, Wenyu
    Jing, Pengtao
    Xu, Wei
    Yuan, Xi
    Wang, Yunjun
    Zhao, Jialong
    Jen, Alex K. -Y.
    [J]. APPLIED PHYSICS LETTERS, 2013, 103 (05)
  • [9] Inverted CdSe/CdS/ZnS quantum dot light emitting devices with titanium dioxide as an electron-injection contact
    Ji, Wenyu
    Jing, Pengtao
    Zhao, Jialong
    Liu, Xingyuan
    Wang, Andrew
    Li, Haibo
    [J]. NANOSCALE, 2013, 5 (08) : 3474 - 3480
  • [10] Improving the efficiency and reducing efficiency roll-off in quantum dot light emitting devices by utilizing plasmonic Au nanoparticles
    Ji, Wenyu
    Jing, Pengtao
    Zhao, Jialong
    [J]. JOURNAL OF MATERIALS CHEMISTRY C, 2013, 1 (03) : 470 - 476
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