A New System of High Cri Color Conversion Material Based on the Fluorophosphate Glass with Ultra-Low Temperature Synthesis

Abstract

In the field of solid-state lighting, phosphor-in-glass composites (PIGs) containing colorful phosphors can be used to improve the spectral fixation and color rendering indices (CRIs) of phosphor conversion materials. However, PIGs using red nitride phosphors are difficult to produce because the phosphors decompose at high temperatures. Therefore, this study presents a method of producing orange–red PIGs at ultra-low temperatures (320 °C) using Y3Al5O12:Ce3+ and CaAlSiN3:Eu2+ phosphors based on the fluorophosphate glass matrix. Scanning electron microscopy and X-ray diffraction show that the crystalline phases of the phosphors in the PIGs remain intact and independent. The prepared samples can achieve luminescence efficiency up to 92.5 lm/W and ideal CRIs. Therefore, the proposed materials have a wide range of potential applications in high-quality lighting and displays.

Keywords: phosphor-in-glass, color rendering index, luminous efficiency