Liquid Phase Precursor driven approach for the synthesis of Ca–Sr–Ba orthosilicate phosphors for white LED applications

Abstract

Compositions of (CaSrBa) orthosilicate phosphors were prepared by Liquid Phase Precursor method. The structural phase determinations were done systematically by powder X ray diffraction and Transmission electron microscopy. The PL emission was observed under 450 and 375 nm excitation and green–red and pure green emission was observed for the 4f⁶5d → 4f⁷ transition of Eu²⁺ ion. The luminescence nature of the samples is determined to vary with crystal field effect on the Eu²⁺ ion and has been studied with the change in the binary Ca–Sr, Ba–Sr and ternary Ca–Sr–Ba compositions.