Fabrication and Luminescent Properties of Dy3+ Doped Sr1-xCaxMoO4
GUAN Li1, LI Xu1,2*, TIAN Xiao-dong1,2, JIN Li-tao1, YANG Yan-min1, LI Pan-lai1, YANG Zhi-ping1,2
1. College of Physics Science and Technology, Hebei University, Baoding 071002, China 2. Key Laboratory of Photo-Electricity Information Materials of Hebei Province, Hebei University, Baoding 071002, China
Abstract:Dy3+ doped Sr1-xCaxMoO4 phosphors were prepared by solid state method in the present paper. The crystal structure, luminescent properties and the effect of x on the luminescent properties were studied by XRD, SEM, excitation, emission and color parameters. The XRD patterns indicated that the samples were single phase of CaMoO4 and SrMoO4 when x=1 and x=0. It can be seen that the crystal size of samples prepared at 750 ℃ for 3 h were 0.2~1.0 μm, which was matched with solid state luminescent device. The excitation spectra monitored at 576 nm were composed of a broad band at 250~340 nm and a series of narrow band at 340~460 nm. The excitation peaks situation of CT transition and the excitation peaks intensity of narrow bands varied with Sr/Ca. The emission spectra excited by 350 nm were composed of two broad bands at 470 and 576 nm, which were attributed to the transition of 4F9/2→6H15/2 and 4F9/2→6H13/2. The emission intensity of yellow and blue emission varied with the value of Sr/Ca.
Key words:LED;Sr1-xCaxMoO4∶Dy3+ phosphor;Solid state method;Emission spectrum;Excitation spectrum
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