Synthesis and characterization of ortho-twisted asymmetric anthracene derivatives for blue organic light emitting diodes (OLEDs) |
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Authors: | Min-Gi ShinSeul Ong Kim Hyun Tae ParkSung Jin Park Han Sung YuYun-Hi Kim Soon-Ki Kwon |
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Affiliation: | a School of Materials Science & Engineering and ERI, Gyeongsang National University, Gajwa-dong 900, Jinju 660-701, Republic of Korea b Department of Chemistry and RINS, Gyeongsang National University, Jinju 660-701, Republic of Korea c EL Materials Development Division, Duksan Hi-Metal Co. Ltd., Seongnam 463-402, Republic of Korea |
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Abstract: | New ortho-twisted asymmetric anthracene derivatives have been synthesized and characterized. The anthracene derivatives show good thermal stability with high glass transition temperatures and a pure blue emission with a narrow full width at half maximum in a film state (λmax = 454 nm with 71 nm for 2-(2-methylnaphtathalene-1-yl)-9,10-di(naphthalene-2-yl)anthracene and λmax = 445 nm with 60 nm for 2-(biphenyl-2-yl)-9,10-di(naphthalene-2-yl)anthracene). A multi-layered device using 2-(2-methylnaphtathalene-1-yl)-9,10-di(naphthalene-2-yl)anthracene as an emitting material exhibits a maximum quantum efficiency of 3.61% (power efficiency of 2.15 lm/W, current efficiency of 3.55 cd/A) and blue Commission Internationale de l’Eclairage chromaticity coordinates (x = 0.15, y = 0.13). A fabricated device using 2-(biphenyl-2-yl)-9,10-di(naphthalene-2-yl)anthracene as an emitting material exhibits a maximum quantum efficiency of 3.7% (power efficiency of 2.11 lm/W, current efficiency of 3.55 cd/A) and a blue Commission Internationale de l’Eclairage chromaticity coordinates (x = 0.15, y = 0.12). |
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Keywords: | Blue OLED Ortho-twisted structure Asymmetric anthracene Color purity Quantum efficiency Inhibited intermolecular interaction |
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