Preparation and luminescent properties of SrMoO4:Eu3+phosphor for light emitting diode

The SrMoO4:Eu3+red phosphors that can be excited effectively by the ultraviolet, near ultraviolet and blue light emitting diode (LED) were prepared by chemical coprecipitation. The crystal structure and luminescent properties of the SrMoO4:Eu3+ phosphors were investigated. The X-ray diffraction patterns showed that the SrMoO4:Eu3+synthesized by the process was a pure phase with tetragonal structure. The excitation spectrum of the SrMoO4:Eu3+red phosphors consisted of a broad band peak and a series of sharp peaks, and since the strong peaks were located at 280 nm (the broad band center), 395 nm and 465 nm, respectively, the phosphor can be excited effectively by the UV LED and Blue LED. The emission spectrum excited by 395 nm showed a strong emission peak at 613 nm, originating from the 5D0→7F2transition of Eu3+ions. The Eu3+ion concentration has great influence on the crystal parameters, the crystal symmetries and the luminescent properties. The influence of different concentrations of doped Eu3+ions on the luminescent intensity of SrMoO4:Eu3+was studied and the optimal doping concentration was found to be 15%.