A red-emitting phosphor K5In3F14:Mn4+ and its potential application in the backlighting

Abstract

A red-emitting phosphor with a short fluorescence lifetime plays an important role in LED backlighting. Herein, new red phosphor K5In3F14:Mn4+ (0.59%) with a tetragonal structure was prepared with the non-equivalent doping of Mn4+. The typical luminescent behaviors of Mn4+ can be observed from the phosphors. Different from the fluoride phosphors with the equivalent doping of Mn4+, K5In3F14:Mn4+ (0.59%) has a short decay time (2.74 ms). The white LED fabricated with K5In3F14:Mn4+ (0.59%) and commercial β-SiALON:Eu2+ emits bright white light under a 20 mA current, and its color gamut is up to 103% of the National Television System Committee (NTSC) standard value. So, K5In3F14:Mn4+ (0.59%) is a potential red component for LED backlighting.