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Chin. Phys. B, 2016, Vol. 25(12): 128502    DOI: 10.1088/1674-1056/25/12/128502

Bright hybrid white light-emitting quantum dot device with direct charge injection into quantum dot

Jin Cao(曹进)2, Jing-Wei Xie(谢婧薇)1, Xiang Wei(魏翔)2, Jie Zhou(周洁)2, Chao-Ping Chen(陈超平)3, Zi-Xing Wang(王子兴)2, Chulgyu Jhun(田哲圭)4
1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
2. Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China;
3. National Engineering Laboratory of TFT-LCD Materials and Technologies, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
4. School of Green Energy & Semiconductor Engineering, Hoseo University, Asan City, Chungnam, 336-795, South Korea

A bright white quantum dot light-emitting device (white-QLED) with 4-[4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl]-2-[3-(tri-phenylen-2-yl)phen-3-yl]quinazoline deposited on a thin film of mixed green/red-QDs as a bilayer emitter is fabricated. The optimized white-QLED exhibits a turn-on voltage of 3.2 V and a maximum brightness of 3660 cd/m2@8 V with the Commission Internationale de l'Eclairage (CIE) chromaticity in the region of white light. The ultra-thin layer of QDs is proved to be critical for the white light generation in the devices. Excitation mechanism in the white-QLEDs is investigated by the detailed analyses of electroluminescence (EL) spectral and the fluorescence lifetime of QDs. The results show that charge injection is a dominant mechanism of excitation in the white-QLED.

Keywords:  quantum dot light-emitting devices      white      ultra-thin film      charge injection  
Received:  08 June 2016      Revised:  08 August 2016      Published:  05 December 2016
PACS:  85.60.Jb (Light-emitting devices)  
  78.67.Hc (Quantum dots)  
  78.20.-e (Optical properties of bulk materials and thin films)  
  61.46.Df (Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))  

Project supported by the National Natural Science Foundation of China (Grant No. 21302122) and the Science and Technology Commission of Shanghai Municipality, China (Grant No. 13ZR1416600).

Corresponding Authors:  Jin Cao     E-mail:

Cite this article: 

Jin Cao(曹进), Jing-Wei Xie(谢婧薇), Xiang Wei(魏翔), Jie Zhou(周洁), Chao-Ping Chen(陈超平), Zi-Xing Wang(王子兴), Chulgyu Jhun(田哲圭) Bright hybrid white light-emitting quantum dot device with direct charge injection into quantum dot 2016 Chin. Phys. B 25 128502

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