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Lowering the driving voltage and improving the luminance of blue fluorescent organic light-emitting devices by thermal annealing a hole injection layer of pentacene |
| Jian Gao(高建)1,2,3, Qian-Qian Yu(于倩倩)1,2,3, Juan Zhang(张娟)1,2,3, Yang Liu(刘洋)1,2,3, Ruo-Fei Jia(贾若飞)1,2,3, Jun Han(韩俊)1,2,3, Xiao-Ming Wu(吴晓明)1,2,3, Yu-Lin Hua(华玉林)1,2,3, Shou-Gen Yin(印寿根)1,2,3 |
1 School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300222, China;
2 Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, Tianjin 300222, China;
3 Tianjin Key Laboratory of Photoelectric Materials and Devices, Tianjin 300222, China |
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Abstract We chose pentacene as a hole injection layer (HIL) to fabricate the high performance blue fluorescent organic light-emitting devices (OLEDs). We found that the carrier mobility of the pentacene thin films could be efficiently improved after a critical annealing at temperature 120 °C. Then we performed the tests of scanning electron microscopy, atomic force microscopy, and Kelvin probe to explore the effect of annealing on the pentacene films. The pentacene film exhibited a more crystalline form with better continuities and smoothness after annealing. The optimal device with 120 ℃ annealed pentacene film and n-doped electron transport layer (ETL) presents a low turn-on voltage of 2.6 V and a highest luminance of 134800 cd/m2 at 12 V, which are reduced by 26% and improved by 50% compared with those of the control device.
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Received: 07 March 2017
Revised: 22 May 2017
Accepted manuscript online:
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PACS:
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85.60.Jb
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(Light-emitting devices)
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78.60.Fi
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(Electroluminescence)
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81.05.Fb
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(Organic semiconductors)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60906022), the Natural Science Foundation of Tianjin, China (Grant No.10JCYBJC01100), the Key Science and Technology Support Program of Tianjin, China (Grant No. 14ZCZDGX00006), and the National High Technology Research and Development Program of China (Grant No. 2013AA014201). |
Corresponding Authors:
Xiao-Ming Wu, Yu-Lin Hua, Shou-Gen Yin
E-mail: wxm@tjut.edu.cn;yulinhua@tjut.edu.cn;sgyin@tjut.edu.cn
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Cite this article:
Jian Gao(高建), Qian-Qian Yu(于倩倩), Juan Zhang(张娟), Yang Liu(刘洋), Ruo-Fei Jia(贾若飞), Jun Han(韩俊), Xiao-Ming Wu(吴晓明), Yu-Lin Hua(华玉林), Shou-Gen Yin(印寿根) Lowering the driving voltage and improving the luminance of blue fluorescent organic light-emitting devices by thermal annealing a hole injection layer of pentacene 2017 Chin. Phys. B 26 098507
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