4, 6-Bis[3-(dibenzothiophen-2-yl)phenyl] pyrimidine bipolar host for bright,efficient and low efficiency roll-off phosphorescent organic light-emitting devices |
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| Affiliation: | 1. State Key Laboratory on Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, Changchun, 130012, People''s Republic of China;2. Beijing Tuocai Optoelectronics Technology Co. Ltd, Beijing, 100086, People''s Republic of China;1. Department of Chemistry, Chemistry Institute for Functional Materials, Pusan National University, Busan 690-735, Republic of Korea;2. Department of Physics, Pukyong National University, Busan 608-737, Republic of Korea;3. Department of Physics, Ulsan University, Ulsan 680-749, Republic of Korea;4. Department of Industrial Chemistry, Pukyong National University, Busan 608-739, Republic of Korea;1. Department of Electrophysics, National Chiayi University, Chiayi, 600, Taiwan;2. Department of Materials Science and Engineering, National Chung Hsing University, Taichung, 402, Taiwan |
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| Abstract: | A bipolar host 4, 6-Bis3-(dibenzothiophen-2-yl)phenyl] pyrimidine (DBTPhPm) with small singlet-triplet splitting has been synthesized and confirmed through a series of photophysical and electrochemical properties. Monochromatic phosphorescent organic light-emitting devices (PHOLEDs) based on different hosts (4,4′-N,N'-dicarbazole) biphenyl, 2,7-bis (diphenylphosphoryl)-9-4-(N,Ndiphenylamino) phenyl]-9-phenylfluorene, (3,3'-bicarbazole) phenyl and DBTPhPm] and dopants are fabricated. Compared to other hosts, the DBTPhPm-based PHOLEDs exhibited high brightness, high efficiency and low efficiency roll-off. The maximum power efficiency of the DBTPhPm-based red (R), green (G), blue (B), yellow (Y), and orange (O) PHOLEDs are 12.2, 47.2, 17.6, 42.6 and 15.1 lm/W, respectively. The current efficiency roll-off of the R, G, B, Y, and O PHOLEDs are 29.8%, 8.6%, 18.2%, 5.9%, and 22.4% from the maximum current efficiency to the high brightness of 5000 cd/m2. The detailed working mechanism of the DBTPhPm-based device is discussed. |
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| Keywords: | OLED Bipolar host Phosphorescent Roll off |
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