New Y2LuCaAl2SiO12:Ln (Ln = Ce3+, Eu3+, and Tb3+) phosphors for white LED applications

Abstract

The purpose of this study was to develop new garnet phosphors for white LED applications. Numerous compositions were designed to explore new garnet structure phosphors. Among the candidates, Y₂LuCaGaAl₂SiO₁₂ was selected as a host material, and Y_2−xLuCaGaAl₂SiO₁₂:xLn (0 ≤ x ≤ 0.12; Ln = Ce³⁺, Eu³⁺, and Tb³⁺) phosphors were prepared by using the solid-state reaction method. The Rietveld refinement results showed that Y_2−xLuCaGaAl₂SiO₁₂:xLn phosphors had a garnet type cubic structure with the Iad space group. The prepared phosphors emitted efficient green, red, and green light by doping Ce³⁺, Eu³⁺, and Tb³⁺, respectively, in Y₂LuCaGaAl₂SiO₁₂, and showed good luminescence efficiency and high emission color purity. These results demonstrate that the Y_2−xLuCaGaAl₂SiO₁₂:xLn phosphors can be useful for white light-emitting diode (LED) and solid-state lighting system applications.