Efficient non-doped blue light emitting diodes based on novel carbazole-substituted anthracene derivatives |
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Authors: | Ying-Hsiao ChenShin-Lei Lin Yu-Chen ChangYung-Chung Chen Jiann-Tsuen LinRong-Ho Lee Wen-Jang KuoRu-Jong Jeng |
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Affiliation: | a Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan b Material and Chemical Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan c Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan d Department of Applied Chemistry, National University of Kaohsiung, Kaohsiung 811, Taiwan e Institute of Polymer Science and Engineering, National Taiwan University, Taipei 106, Taiwan |
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Abstract: | In this study, we synthesized three anthracene derivatives featuring carbazole moieties as side groups - 2-tert-butyl-9,10-bis[4-(9-carbazolyl)phenyl]anthracene (Cz9PhAnt), 2-tert-butyl-9,10-bis{4-[3,6-di-tert-butyl-(9-carbazolyl)]phenyl}anthracene (tCz9PhAnt), and 2-tert-butyl-9,10-bis{4′-[3,6-di-tert-butyl-(9-carbazolyl)]biphenyl-4-yl}anthracene (tCz9Ph2Ant) - for use in blue organic light emitting devices (OLEDs). The anthracene derivatives presenting rigid and bulky tert-butyl-substituted carbazole units possessed high glass-transition temperatures (220 °C). Moreover, the three anthracene derivatives exhibited strong blue emissions in solution, with high quantum efficiencies (91%). We studied the electroluminescence (EL) properties of non-doped OLEDs incorporating these anthracene derivatives, with and without a hole-transporting layer (HTL). OLEDs incorporating an HTL provided superior EL performance than did those lacking the HTL. The highest brightness (6821 cd/m2) was that for the tCz9PhAnt-based device; the greatest current efficiency (2.1 cd/A) was that for the tCz9Ph2Ant-based device. The devices based on these carbazole-substituted anthracene derivatives also exhibited high color purity. |
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Keywords: | Organic light-emitting diodes Carbazole group Anthracene derivative Electroluminescence properties |
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