A highly efficient warm white light-emitting Eu2+-activated silicate host: another striking application of mesoporous silica

Abstract

This study outlines a novel approach to the synthesis of an efficient yellow-emitting Sr_0.975Ca_0.975Eu_0.05SiO₄ phosphor with the adequate red spectral components. This was achieved by the use of a well-known silicate source, mesoporous silica. The findings showed that the synthesized phosphor gave a broad emission from blue to red, along with a stable emission color till 450 K and an emission decay time of 1 μs. When the phosphor was fabricated using UV (400 nm) and blue LED (450 nm) chips, it promisingly generated warm white light at a color temperature < 4000 K and a color rendering index > 80.