Light-Emitting Nitride and Oxynitride Phosphors

During the past decade, the luminescent properties of other Si-based ternary 

Silicon-based oxynitride and nitride phosphors have encouraging luminescent properties (excitability by blue light, high conversion efficiency, and the possibility of full color emission), as well as a low thermal quenching, high chemical stability, and high potential for use in white LEDs [288, 289]. 

Compared with oxide-, boride-, sulfide-, or phosphate-based phosphors, the study of oxynitride and nitride phosphors is at a very early stage. However, a variety of oxynitride and nitride materials with promising luminescent properties have been discovered recently [290-292]. 

Hirosaki et al. [289] reported the blue-emitting Ce -doped LaAl(Si6 2AyN lo-zOz oxynitride phosphor. Blue emission also showed the Ce -activated a-sialon. 

Hirosaki et al. [292, 295] and Zhou et al. [296] reported a green oxynitride phosphor based on Eu -doped P-sialon. Other suitable host lattices for phosphors include MSi202N2 compounds (M = Ca, Sr, and Ba) for example, SrSi202N2 Eu emits a green color, BaSi202N2 Eu + yields blue-green emission, while CaSi202N2  

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