Photoluminescence properties of Dy3+/Sm3+ co-doped gallium silicate glass–ceramics for solid-state warm white lighting.

• A novel Dy3+/Sm3+ co-doped gallium silicate glass-ceramic for indoor warm white light illumination was prepared. The matrix components are 43SrCO 3 +7Nb 2 O 5 +21Ga 2 O 3 +29SiO 2. • The glass-ceramic has good thermal stability. • This glass-ceramic maintains good transparency in the visible light range (The transmittance is about 60 %, after the heat treatment at 830℃/ 2 h). • Multiple energy transfer channels exist between Dy3+ and Sm3+ ions. • These glass-ceramics have potential applications in indoor warm white lighting. In this paper, a series of Dy3+ and Dy3+ /Sm3+ ions co-doped gallium silicate glass–ceramics prepared by conventional melt crystallization method. The best heat treatment conditions and the luminescence properties of the glass–ceramics were systematically investigated by XRD, DSC, SEM and spectrophotometer, respectively. To obtain glass-ceramic samples with high transmittance and good luminescence performance, the best heat treatment procedure should be 830℃/4 h. The energy transfer relationship between Dy3+ ions and Sm3+ ions is discussed through emission decay curves and energy level diagrams. The Dy3+/Sm3+ ions co-doped samples have good thermal stability, maintaining 67.9 % of the emission intensity at 150 °C. The CCT of the SNGSDy 4.0 Sm 0.6 sample was 3330 K under 402 nm excitation. The results indicate that the sample is suitable for solid state lighting technology, and the warm white light source can be used for indoor lighting in halls and corridors. [ABSTRACT FROM AUTHOR]