High-efficiency blue and white phosphorescent organic light-emitting devices |
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| Affiliation: | 1. NHK Science and Technical Research Laboratories, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157-8510, Japan;2. Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8610, Japan;1. Department of Physics, Karnatak University, Dharwad 580003, Karnataka, India;2. Department of Chemistry, Karnatak University, Dharwad 580003, Karnataka, India;2. Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;1. College of Chemistry and Environmental Science, Key Laboratory of Chemical Biology of Hebei Province, Hebei University, Baoding 071002, China;2. Printalbe Electronics Research Centre, Suzhou Institute of Nanotech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, China;3. MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;1. Department of Polymer Engineering, Pukyong National University, Busan 48547, South Korea;2. Department of Materials Chemistry and Engineering, Konkuk Univerisity, Seoul 05029, South Korea |
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| Abstract: | We have significantly improved the efficiency of blue and white phosphorescence from organic light-emitting devices (OLEDs) based on phosphorescent iridium complexes. To improve the emission efficiency, 4,4′-Bis(9-carbazolyl)-2,2′-Dimethyl-biphenyl (CDBP), which has a high triplet energy, was used as the carrier-transporting host for the emissive layer. The blue phosphorescent OLED exhibited a maximum external quantum efficiency of 10.4%, which corresponds to a current efficiency of 20.4 cd/A. This result can be explained as due to the efficient confinement of triplet energy on blue phosphorescent molecules, which is consistent with the results of transient photoluminescence experiments. The white phosphorescent OLED with greenish-blue and red emissive layers exhibited a maximum external quantum efficiency of 12% and a luminous efficiency of 18 cd/A. This is primarily attributed to the improvement of greenish-blue emission efficiency as well as the emission efficiency of the blue phosphorescent OLED. |
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