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Improved light extraction of organic light emitting diodes with a nanopillar pattering structure |
| Gao Zhi-Xiang (高志翔)a b, Wang Hua (王华)a c, Hao Yu-Ying (郝玉英)a d, Miao Yan-Qin (苗艳勤)a c, Xu Bing-She (许并社)a c |
a Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;
b School of Physical Science and Electronics, Shanxi Datong University, Datong 037009, China;
c Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China;
d Department of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China |
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Abstract We have investigated the properties of organic light emitting diodes (OLEDs) with a nanopillar patterning structure at organic–metal or organic–organic interfaces. The results demonstrate that the introduction of a nanopillar structure can improve the light extraction efficiency greatly. We also find that the number, height, and position of nanopillars all affect the light extraction of OLEDs. The maximum power efficiency of a device with an optimized nanopillar patterning mode can be improved to 2.47 times that of the reference device. This enhancement in light extraction originates from the improved injected carriers, the broadened charge recombination zone, and the intensified wave guiding effects.
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Received: 27 March 2013
Revised: 14 May 2013
Accepted manuscript online:
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PACS:
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68.35.-p
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(Solid surfaces and solid-solid interfaces: structure and energetics)
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85.35.-p
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(Nanoelectronic devices)
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78.55.Kz
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(Solid organic materials)
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| Fund: Project supported by the Program for Changjiang Scholar and Innovation Research Team in Universities of China (Grant No. IRT0972), the International Science & Technology Cooperation Program of China (Grant No. 2012DFR50460), the National Natural Scientific Foundation of China (Grant Nos. 21071108, 60976018, 21101111, 61274056, and 61205179), and the Key Innovative Research Team in Science and Technology of Shangxi Province, China (Grant No. 2012041011). |
Corresponding Authors:
Xu Bing-She
E-mail: xubs@tyut.edu.cn
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Cite this article:
Gao Zhi-Xiang (高志翔), Wang Hua (王华), Hao Yu-Ying (郝玉英), Miao Yan-Qin (苗艳勤), Xu Bing-She (许并社) Improved light extraction of organic light emitting diodes with a nanopillar pattering structure 2013 Chin. Phys. B 22 116801
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