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Paper | Regular issue | Vol 68, No. 4, 2006, pp.733-748
Published online, 10th March, 2006
DOI: 10.3987/COM-06-10699
New Efficient Blue-greenish Electroluminescent Materials of 1,3,4-Oxadiazole-based Pyrazole Derivatives

En-Ming Chang, Chi-Jen Lin, Fung Fuh Wong,* and Mou-Yung Yeh*

*Sustainable Environment Research Center, National Cheng Kung University, No. 500, Sec. 3, An-ming Rod., Tainan City, 709, Taiwan, R.O.C.

Abstract

Novel blue-greenish electroluminescent materials of 1,3,4-oxadiazole-based pyrazole derivatives as electronic-transporting molecules have been synthesized and characterized. Those compounds are convenient successful inducted a pyrazole chromophore and multiple 1,3,4-oxadiazole moieties by 1,3-dipolar-cyclization and dehydration-cyclization to promote the conjugation range and exhibit high thermal stability and good physical properties. The chromophore of pyrazole plays assistant role in controlling fundamental electroluminescent process. Spectroscopic studies, the measurements of cyclic voltammogram, thermal characterization and electroluminescent properties have revealed that 1,3,4-oxadiazole-based pyrazole derivatives are efficient blue-greenish electroluminescent materials.