Synthesis, characterisation and electroluminescence behaviour of 蟺-conjugated imidazole-isoquinoline derivatives

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• 作者：N. Nagarajan ; Asit Prakash ; G. Velmurugan ; N ; a Shakti ; Monica Katiyar ; P. Venuvanalingam ; R. Renganathan
• 关键词：Imidazole ; Isoquinoline ; Blue light ; Pure white light ; Electromer ; TD-DFT
• 刊名：Dyes and Pigments
• 出版年：March, 2014
• 年：2014
• 卷：102
• 期：Complete
• 页码：180-188
• 全文大小：1179 K

文摘

A series of highly fluorescent, isoquinoline 蟺-conjugated imidazole derivatives have been synthesized and fully characterized. Their photophysical, electrochemical and thermal properties have also been discussed. The interplay of amorphous and crystalline nature of the compounds in thin film and fine powder have been analysed by using X-ray diffraction and atomic force microscopic (AFM) techniques. An organic light emitting diode consisting of 4-(4-(1-(4-methoxyphenyl)-4,5-diphenyl-1H-imidazol-2-yl)phenyl)isoquinoline as the emitting layer doped with 4,4鈥?Bis(N-carbazolyl)-1,1鈥?biphenyl (CPB) showed ideal blue emission (CIE: 0.16, 0.08). 鈥淧ure鈥?white light (CIE: 0.34, 0.32) comprising of a blue light from excimers and an orange light from electromers at a high voltage has been achieved by using the compounds 2-(4-(isoquinolin-4-yl)phenyl)-1H-phenanthro[9,10-d]imidazole & 2-(4-(isoquinolin-4-yl)phenyl)-1-(4-methoxyphenyl)-1H-phenanthro[9,10-d]imidazole as single-emitting components. To elucidate the structural and optical properties, computational calculations have been performed. Computed results reveal聽all the electronic transitions are of 蟺聽鈫捖犗€* type and energy of the S₀聽鈫捖燬₁ follows same variation trend with the band gap.