RECENT PROGRESS IN NITRIDE-BASED RED EMITTING PHOSPHORS

Recently, the synthesis, structural and luminescence characteristics of rare earth (especially Eu2+) doped nitrides has been extensively studied, and a novel family of red emitting luminescent materials with tremendous merits has been developed. This paper reviews the synthesis and luminescence characteristics of some nitrides [such as M2Si5N8:Eu2+ (M=Ca, Sr, Ba); MAlSiN3:Eu2+ (M=Ca, Sr, Ba); M[Mg2Al2N4]:Eu2+ (M=Ca, Sr, Ba, Eu); M[Li2Al3N4]:Eu2+ (M=Ca, Sr); Ba[Mg2Ga2N4]:Eu2+; M[Mg3SiN4]:Eu2+ (M=Sr, Ba); CaMg2AlN3 etc.] based red emitting phosphors and their applications in solid-state lighting like white LEDs. These phosphors exhibit interesting physical, chemical and luminescent properties, enabling them to use as next generation luminescent materials in white LEDs with tuneable efficiency, colour temperature and better colour rendering index (CRI).