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Proceedings Paper

Effect of a delta-doping green emitting layer in white organic light-emitting device
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Paper Abstract

White organic light-emitting devices (WOLEDs) based on a double-emitting layer (EML) structure were fabricated, while phosphorescent blue and yellow emitters were employed. An ultra-thin layer of non-doped green tris(2-phenylpyridine) iridium [Ir(ppy)3], which was considered as delta-doping layer, was inserted between the two EMLs for optimization. Furthermore, effect of adjusting thickness of this thin layer on device performance was studied. The results showed that the optimized WOLED consisting of 1-nm Ir(ppy)3 EML achieved a maximum luminance of 29,100 cd/m2, maximum external quantum efficiency of 7%, maximum current efficiency of 25.3 cd/A and maximum power efficiency of 7.8 lm/W, together with low efficiency roll-off over a wide luminance range. Meanwhile, the white emission with Commission Internationale del’Eclariage (CIE) coordinates of (0.382,0.446) at a driving voltage of 10 V were observed. The performance enhancement is ascribed to improved charge carrier balance through introduction the highly efficient Ir(ppy)3 as the thin delta-doping layer.

Paper Details

Date Published: 15 October 2012
PDF: 7 pages
Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 84190B (15 October 2012); doi: 10.1117/12.977838
Show Author Affiliations
Juan Zhao, Univ. of Electronic Science and Technology of China (China)
Junsheng Yu, Univ. of Electronic Science and Technology of China (China)
Yadong Jiang, Univ. of Electronic Science and Technology of China (China)


Published in SPIE Proceedings Vol. 8419:
6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy
Yadong Jiang; Junsheng Yu; Zhifeng Wang, Editor(s)

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