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A novel compound of pyrazoline derivative, 3-(4-methoxyphenyl)-5-[4-(1,1-dimethylethylphenyl)]-4,5-dihydro-1- phenyl 1H-Pyrazole (PYZ) has been synthesized. It has a good photoluminescence property and could give blue fluorescence. Four devices have been fabricated to study the carrier-transporting and electroluminescence properties of PYZ. The results indicate that PYZ is a good blue electroluminescent material. The emission peak is observed at 449nm and the half bandwidth is about 80nm, showing that it could emit pure blue light. As to carrier-transporting property, PYZ is found to have electron-transporting ability besides its excellent hole transporting ability.