Photoluminescence studies of red-emitting Y5Mo2O12: Eu3+, Sm3+ as a near-UV convertible phosphor

Abstract

Rare earth doped Y5Mo2O12 has been prepared by a solid-state reaction at 650°C. For Eu3+ single-doped Y5Mo2O12, the luminescence intensity changes with the concentration of Eu3+ ions, and Y5Mo2O12: 0.5Eu3+ exhibits the most intense red-emission under near UV excitation. For the Eu3+, Sm3+ co-doped system under 405nm excitation responsible for the 6H5/2→4K11/2 transition of Sm3+, the f–f transitions of both Eu3+ and Sm3+ are observed in photoluminescence spectra and the intensities of the main emission line (5D0→7F2 transition of Eu3+ at 612nm) are strengthened owing to the energy transition from Sm3+ to Eu3+. The energy transfer from Sm3+ ions to Eu3+ ions is to be proved by comparing the luminescence intensity of Eu3+ ions single doped sample with that of Eu3+ and Sm3+ co-doped sample. The luminescence is improved owing to Sm3+ ions' introduced into Y5Mo2O12: Eu3+ and luminescence intensities are about 7 times under 272nm excitation and about 1.5 times under 403nm excitation.