High-efficiency yellow-emitting La 3 Si 6 N 11 :Ce phosphor-in-glass for laser-driven white lighting

To cope with the market competition of solid-state lighting, there is an urgent need for an efficient and stable fluorescent conversion material that can be used in high-performance lighting. A novel and unique nitride phosphor, La 3 Si 6 N 11 :Ce 3+ (LSN), exhibits a wider luminescence spectrum and better thermal quenching performance than Y 3 Al 5 O 12 :Ce 3+ (YAG). In this study, LSN phosphors are dispersed in a SiO 2 –B 2 O 3 –CaO–Na 2 O glass system, and a series of LSN phosphor-in-glass (LSN PiG) samples are prepared by a low-temperature co-sintering technique. The luminescence, thermal stability, microstructure and photoluminescence properties are investigated. The internal quantum efficiency of LSN:Ce PiG (85%) is close to that of the original phosphor (90%). Under excitation of a 450 nm blue laser diode, the LSN PiG produces white light with a luminescence efficiency of 145.91 lm/W, and a luminous flux of 209lm is achieved. Moreover, the color rendering index of LSN is much higher than that of YAG, reaching 73, indicating that LSN PiGs have good application prospects as yellow converters in high-power laser lighting.