Facile synthesis of a thermally stable Ce3+:Y3Al5O12 phosphor-in-glass for white LEDs

Abstract

This study outlines a general but convenient approach towards the synthesis of a Ce³⁺:Y₃Al₅O₁₂ phosphor-in-glass (PiG) with a relatively low sintering temperature. A comparative study of the as-synthesized PiG and glass ceramic prepared using a conventional route was carried out to explore the structural, morphological and optical properties. In addition, the effect of phosphor concentration and the sintering temperature/time on the luminescence properties was systematically investigated. Notably, we fabricated a high-performance white LED based on PiG with a high luminous efficacy (125 lm W⁻¹), low correlated colour temperature (4329 K) and colour rendering index of 68. Furthermore, the PiG material demonstrates an excellent thermal stability up to 150 °C, superior to the low thermal stability of conventional Ce³⁺:Y₃Al₅O₁₂ doped silicone. Therefore, we present a transparent phosphor glass with desirable potential for application in high powered W-LEDs.