Doping effect of Ir(ppy)3 on white-light electrophosphorescent devices based on platinum(II) [1,3-difluoro-4,6-di(2-pyridinyl)benzene] chloride |
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| Affiliation: | 1. School of Physical Science and Electronics, Shanxi Datong University, Datong 037009, China;2. Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;3. Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China;4. Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China;1. The School of Mechanical and Electrical Engineering, Henan University of Technology, Zhengzhou 450052, China;2. The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States;3. School of Materials Science and Engineering, HuaZhong University of Science and Technology, Wuhan 430074, China;1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, Shandong 266100, China;2. Chia Nan University of Pharmacy and Science, Tainan, Taiwan;3. Wuhan University of Science and Technology, Wuhan, China |
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| Abstract: | Phosphorescent white organic light-emitting diodes (WOLEDs) based on single doped platinum(II) [1,3-difluoro-4,6-di(2-pyridinyl)benzene] chloride (Pt-4) emission layers were investigated in this paper. The devices exhibited electroluminescence spectra composed of bluish (λmax = 480 nm) and reddish (λmax = 660 nm) emission bands, which corresponding to monomer and excimer emission originated from Pt-4 dopants. With optimized device structures, a maximum current efficiency of 11.5 cd/A was obtained and remained above 10 cd/A even the brightness was over 6000 cd/m2. Furthermore, by integrating the fac-tris(2-phenylpyridine) iridium(III) as a complementary emitter and an additional 2,2′,2″-(1,3,5-phenylene)-tris(1-phenyl-1H-benzimidazole) space layer, the device efficiency was further improved, which exhibited a maximum current efficiency of 20.4 cd/A at the luminance of 100 cd/m2, and maintained the mild efficiency roll-off that similar to its single Pt-4 doped counterpart. |
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| Keywords: | White-light Organic light-emitting diodes Excimer Electrophosphorescent Efficiency roll-off |
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