Characterizations and optical properties of orange–red emitting Sm3+-doped Y6WO12 phosphors

Abstract

A series of orange–red emitting Y6WO12:xSm3+ (0.005≤x≤0.15) phosphors were synthesized by the convenient solid-state reaction. X-ray diffraction and photoluminescence spectra were utilized to characterize the structure and luminescence properties of the as-synthesized phosphors. The results show an efficient energy transfer from WO66− group to Sm3+ occurs. The emission spectra of the Y6WO12:Sm3+ phosphors consisted of some sharp emission peaks of Sm3+ ions centred at 571nm, 610nm, 675nm, 720nm. The strongest one is located at 610nm due to 4G5/2–6H7/2 transition of Sm3+, generating bright orange–red light. The optimum dopant concentration of Sm3+ ions in Y6WO12:Sm3+ is around 5mol% and the energy transfer between Sm3+ is found to be through exchange interaction. The CIE chromaticity coordinates of the Y6WO12:0.05Sm3+ phosphor were located in the orange reddish region. The Y6WO12:Sm3+ phosphors may be potentially used as orange–red phosphors for white light-emitting diodes.