Undoped blue organic light-emitting diodes using 2-diphenylaminofluoren-7-ylstyryl derivatives

Heung Soo Jang, Ji Young Song, Kum Hee Lee, Dong Hwan Lim, Seok Jae Lee, Young Kwan Kim, Seung Soo Yoon
Journal of Nanoscience and Nanotechnology 2014, 14 (8): 6217-20
Blue fluorescent materials based on diphenylaminofluorenylstyryl derivatives connected with the various end-capping aromatic groups were synthesized and characterized. An OLED, using (E)-9,9-diethyl-7-(4-(4-fluoronaphthalen-1-yl)styryl)-N,N-diphenyl-9 H-fluoren-2-amine(5) in emitting layer, was fabricated. This device showed the highly efficient blue emission with the maximum luminance of 5138 cd/m2, the luminous efficiency of 3.92 cd/A, the power efficiency of 3.17 lm/W, the external quantum efficiency of 2.90% at 20 mA/cm2 and CIE x, y coordinates of (0.14, 0.17).

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