Improving of the luminous efficacy of the YAG:Ce phosphor in glass by doping with the transition metals into the glass frits

Abstract

Phosphor in glass (PiG) has been extensively investigated as color convertor for a white high-power solid lighting system due to their excellent thermal and chemical stabilities and ease of formability. Recently, as the demand on high power LED is increased, color converters are required to improve luminous efficacy. In our previous studies, we have been studied to obtain the PiG materials with high optical efficacy by modifying the chemical composition of glass frits as well as the particle size of the phosphor or glass frits and content of the phosphor in glass. In this study, we modified the chemical composition of glass frits by doping with transition metals such as Ni, Nb, Cu, Ti and Mn to improve the luminous efficacy of the YAG:Ce PiG. The KFP-Nb sample exhibits a higher, the luminous efficacy of the YAG:Ce PiG was successfully enhanced by Nb doping into the glass frits and the luminous efficacy of the PiG sample is estimated to be 86 lm/Wrad. © 2023, The Korean Ceramic Society.