Molecular Engineering of Blue Fluorescent Molecules Based on Silicon End‐Capped Diphenylaminofluorene Derivatives for Efficient Organic Light‐Emitting Materials |
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Authors: | Kum Hee Lee Lee Kyung Kang Jin Yong Lee Sunwoo Kang Soon Ok Jeon Kyoung Soo Yook Jun Yeob Lee Seung Soo Yoon |
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Affiliation: | 1. Department of Chemistry Sungkyunkwan University 300 Cheoncheon‐dong, Jangan‐gu, Suwon, Gyeonggi, 440‐746 (Korea);2. Department of Polymer Science and Engineering Dankook University 126, Jukjeon‐dong, Suji‐gu, Yongin, Gyeonggi, 448‐701 (Korea) |
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Abstract: | Blue fluorescent materials based on silicone end‐capped 2‐diphenylaminofluorene derivatives are synthesized and characterized. These materials are doped into a 2‐methyl‐9,10‐di‐2‐naphthyl]anthracene host as blue dopant materials in the emitting layer of organic light‐emitting diode devices bearing a structure of ITO/DNTPD (60 nm)/NPB (30 nm)/emitting layer (30 nm)/Alq3 (20 nm)/LiF (1.0 nm)/Al (200 nm). All devices exhibit highly efficient blue electroluminescence with high external quantum efficiencies (3.47%–7.34% at 20 mA cm?2). The best luminous efficiency of 11.2 cd A?1 and highest quantum efficiency of 7.34% at 20 mA cm?2 are obtained in a device with CIE coordinates (0.15, 0.25). A deep‐blue OLED with CIE coordinates (0.15, 0.14) exhibits a luminous efficiency of 3.70 cd A?1 and quantum efficiency of 3.47% at 20 mA cm?2. |
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Keywords: | fluorescent materials molecular engineering organic light‐emitting diodes silicone |
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