A highly efficient deep blue fluorescent OLED based on diphenylaminofluorenylstyrene-containing emitting materials |
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Authors: | Seul Ong Kim Kum Hee Lee Gu Young Kim Ji Hoon Seo Young Kwan Kim Seung Soo Yoon |
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Affiliation: | 1. Department of Chemistry, Sungkyunkwan University, 300 Cheoncheon-Dong, Jangan-gu, Suwon 440-746, Gyunggi-do, Republic of Korea;2. Department of Information Display, Hongik University, Seoul 121-791, Republic of Korea |
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Abstract: | We have designed and synthesized five blue emitters based on diphenylaminofluorenylstyrene emitting core groups. Multilayered OLEDs were fabricated using these materials as dopants in a 2-methyl-9,10-di(naphthen-2-yl)anthracene (MADN) host. One of them in particular a deep blue OLED using dopant 9-4-(2-diphenylamino-9,9-diethylfluoren-7-yl)phenyl]-9-phenylfluorene (3) at 15% doping concentration exhibited a maximum luminance of 4720 cd m?2 at 9.0 V, a luminous efficiency of 5.3 cd A?1 at 20 mA cm?2, a power efficiency of 2.9 lm W?1 at 20 mA cm?2, an external quantum efficiency of 4.8% at 20 mA cm?2, and CIE coordinates (x = 0.15, y = 0.13) at 8.0 V. Furthermore, this deep blue device had very stable CIE coordinates of (x = 0.15, y = 0.13) that did not vary with doping concentration from 5% to 15%. |
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