Photoluminescence properties of a new orange–red emitting Sm3+-doped Y2Mo4O15 phosphor

Abstract

A series of novel Y2Mo4O15:xSm3+ ( (0.01 ≤ x ≤ 0.20) phosphors for white light-emitting (W-LEDs) were successfully prepared by the solid state reaction technology at 973K for 12h. X-ray diffraction and photoluminescence spectra were utilized to characterize the structure and luminescence properties of the as-synthesized phosphors. The emission spectra of the Y2Mo4O15:Sm3+ phosphors consisted of some sharp emission peaks of Sm3+ ions centered at 565nm, 605nm, 650nm, and 712nm. The strongest one is located at 605nm due to 4G5/2–6H7/2 transition of Sm3+, generating bright orange–red light. The optimum dopant concentration of Sm3+ ions in Y2Mo4O15:xSm3+ is around 5mol% and the critical transfer distance of Sm3+ is calculated as 23.32Å. The CIE chromaticity coordinates of the Y2Mo4O15:0.05Sm3+ phosphors were located in the orange reddish region. The Y2Mo4O15:Sm3+ phosphors may be potentially used as red phosphors for white light-emitting diodes.