Double substitution induced tunable luminescent properties of Ca3−xYxSc2−xMgxSi3O12:Ce3+ phosphors for white LEDs

Abstract

Y³⁺–Mg²⁺ pairs were incorporated into the Ca₃Sc₂Si₃O₁₂ for Ca²⁺–Sc³⁺ sites to investigate their structural and optical properties systematically, their potential applications in white light-emitting diodes, as well as the coexistent shrinkage effects of the first sphere and the second sphere based on the Rietveld refinement analysis of X-ray diffraction data. Due to the substitution of Y³⁺–Mg²⁺, an obvious red shift of the emission occurs. CIE chromaticity coordinates, quantum efficiency as well as thermal stability suggest that this double substitution is an efficient way to tune the luminescence properties of phosphors. The white LED devices were also successfully fabricated which demonstrates that such a kind of double substitution will be a promising way to broaden the applications of phosphors in advanced lighting in the future.