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

Rare earth doped Y5Mo2O12 has been prepared by a solid-state reaction at 650 degrees C. For Eu3+ single-doped Y5Mo2O12, the luminescence intensity changes with the concentration of Eu3+ ions, and Y5Mo2O12: 0.5Eu(3+) exhibits the most intense red-emission under near UV excitation. For the Eu3+, Sm3+ co-doped system under 405 nm excitation responsible for the H-6(5/2)-> K-4(11/2) 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 (D-5(0)-> F-7(2) transition of Eu3+ at 612 nm) 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 272 nm excitation and about 1.5 times under 403 nm excitation. (C) 2013 Elsevier B.V. All rights reserved.