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

• Published in: Journal of luminescence 2013-10, Vol.142, p.173-179
• Main Authors: Lee, Wen-Lung, Liu, Lung-Chang, Chung, Ming-Hua, Chen, Chien-Ming, Lin, Jian-Shian
• Format: Article
• Language: English
• Subjects: Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Density; Derivatives; Electroluminescence; Electronics; Encapsulation; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Heat transfer; Light-emitting diodes; Light-emitting diodes (LED); Luminescence; Microwave; Optical materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optics; Optoelectronic devices; Other luminescence and radiative recombination; Phosphors; Physics; Polymers and organics; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Specific gravity; Thermal resistance
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2013.04.012

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 CIEx,y=(0.35, 0.34) and CIEx,y=(0.25, 0.24), respectively. •Benazoxoazol derivatives have been fast synthesized under microwave illumination.•Lab-made benazoxoazol derivatives exhibit excellent thermal stabilities and high fluorescent quantum yields.•With them, white light-emitting diodes have been manufactured.