A novel efficient mesoporous silica assisted green emitting phosphors-an exotic remote phosphor with high quantum yield

Abstract

A novel attempt towards the development of Eu²⁺ doped barium silicate and strontium barium silicate has been put forth using a versatile material, namely mesoporous silica through a convenient wet-solid phase reaction. The developed phosphor can be efficiently excited in a broad spectral range of 200–500 nm, and gets emitted strongly in the green region. On introduction of strontium to Eu²⁺ doped barium silicate phosphor, a clear red shift has been recorded in the photoluminescence spectra. These mesoporous silica assisted synthesis of Ba_1.95Eu_0.05SiO₄ and Ba_0.975Sr_0.975Eu_0.05SiO₄ phosphors showed a good thermal luminescence stability and high quantum efficiency of about 85%. It has been successfully used for the fabrication of a flexible and translucent remote phosphor. The fabricated remote phosphor attached proto-type LED exhibits a very strong green emission and this can be utilized as an efficient green component for various applications apart from the white LED productions.