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

摘要

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 Ba1.95Eu0.05SiO4 and Ba0.975Sr0.975Eu0.05SiO4 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.