Semiconductor Physics, Quantum Electronics & Optoelectronics. 2007. V. 10, N 1. P. 077-082.

1,4-bis(2,2-diphenylethenyl)benzene as an efficient emitting material for organic light emitting diodes
Larysa Fenenko1,2, Guoliang Mao3, Akihiro Orita3, Junzo Otera3, Petro Smertenko2, Georgi Svechnikov2, Jun-ichi Nishide4 , Hiroyuki Sasabe4, Chihaya Adachi1

1Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan
2V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, Department of Optoelectronics, 41, prospect Nauky, 03128 Kyiv, Ukraine
3Department of Applied Chemistry, Okayama University of Science, 1-1 Ridai, Okayama 700-0005, Japan
4Chitose Institute of Science and Technology (CIST), 758-65 Bibi, Chitose, Hokkaido 066-8655, Japan *Corresponding author: e-mail: fenenko@

Abstract. We report on the photophysical properties of 1,4-bis(2,2-diphenyl- ethenyl)benzene (PEB) in a solution and a solid state. A poor blue photoluminescence efficiency of PEB in a solution dramatically increases in the deposited film. We explain such properties in terms of molecular dynamics and degrees of intramolecular freedom in various molecular environments. PEB as an electron-transport and emitting layer in organic light-emitting diodes (OLEDs) shows bright blue-green electroluminescence (EL) with the peak wavelength at λ max ~ 495 nm. The maximum external EL quantum efficiency of η EL = 2.5 % and maximum luminance of 41600 cd/m 2 in the optimized device were obtained, indicating that PEB possesses superior electron-transport ability.

Keywords: electroluminescence, electrical transport characteristics, OLED, 1,4-bis(2,2- diphenylethenyl)benzene (PEB).

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