Microwave-assisted synthesis of benazoxoazol derivatives and their applications for phosphors of white light-emitting diodes.

Abstract: In this paper, several benazoxoazol derivatives have been rapidly and effectively synthesized by microwave irradiation and their physical properties (i.e. specific gravities, thermal resistance, and florescent performances) have also been investigated. Since lab-made organic phosphors (OP-1 and OP-2) exhibit high fluorescent efficiencies, low specific gravities, and excellent thermal resistance, we have applied them for the encapsulation of white light-emitting diodes (LEDs) as phosphors. Experimental results reveal that OP-1 and OP-2 possess appropriate emitting wavelengths and their electroluminescent properties highly depend upon their chemical structures, thus causing the diverse hues of white LEDs with them. The hues of white LEDs with OP-1 and OP-2 are CIE x,y =(0.35, 0.34) and CIE x,y =(0.25, 0.24), respectively. [Copyright &y& Elsevier]