High-brightness blue organic light emitting diodes with different types of guest-host systems |
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| Authors: | WANG Xiao ZHANG Jing-shuang PENG Cui-yun GUO Kun-ping WEI Bin ZHANG Hao |
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| Affiliation: | School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;Langfang Polytechnic Institute, Langfang 065001, China;Key Laboratory of Advanced Display and System Application, Ministry of Education of China, Shanghai University, Shanghai 200072, China;Key Laboratory of Advanced Display and System Application, Ministry of Education of China, Shanghai University, Shanghai 200072, China;Key Laboratory of Advanced Display and System Application, Ministry of Education of China, Shanghai University, Shanghai 200072, China;Key Laboratory of Advanced Display and System Application, Ministry of Education of China, Shanghai University, Shanghai 200072, China |
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| Abstract: | We demonstrate high-brightness blue organic light emitting diodes (OLEDs) using two types of guest-host systems. A series of blue OLEDs were fabricated using three organic emitters of dibenz anthracene (perylene), di(4-fluorophenyl) amino-di (styryl) biphenyl (DSB) and 4,4''-bis[2-(9-ethyl-3-carbazolyl)vinyl]biphenyl (BCzVBi) doped into two hosting materials of 4,4''-bis(9-carbazolyl) biphenyl (CBP) and 2-(4-biphenylyl)-5(4-tert-butyl-phenyl)-1,3,4-oxadiazole (PBD) as blue emitting layers, respectively. We achieve three kinds of devices with colors of deep-blue, pure-blue and sky-blue with the Commission Internationale de L''Eclairage (CIE) coordinates of (0.16, 0.10), (0.15, 0.15) and (0.17, 0.24), respectively, by employing PBD as host material. In addition, we present a microcavity device using the PBD guest-host system and achieve high-purity blue devices with narrowed spectrum. |
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