Research On Low-temperature Combustion Synthesis Of Rare-earth Ion Doped Strontium Molybdate Phosphor

A novel SrMoO4:Pr3+red phosphor and SrMoO4:Dy3+yellow(reddish) phosphor for white light emitting diode (WLED) was successfully prepared by the low temperature combustion method. The preparation of the low-temperature combustion and the luminescence properties of SrMoO4:Pr3+phosphor and SrMo04:Dy3+phosphor wereresearched detail in this paper. the specific studies as follows:1) The red phosphor SrMoO4:Pr3+was prepared by the low temperature combustion, we studied on the influence of the structure and properties of the samples from the the calcination temperature, the amount of urea, the amount of boric acid, and obtaining the best process parameters. Research shows that when the calcination temperature is600℃, urea in an amount of three times of the theoretical amount and the amount of boric acid is added10%mole fraction, we can obtain the red phosphor SrMo04:Pr3+with better morphology properties by low-temperature combustion method, it is also studied on the morphology difference of the samples between preparing by the conventional solid-state reaction method and preparing by the low temperature combustion method.2) The red phosphor Sr1-xMoO4:xPr3+,xM+(M=Li、Na、K, x between0.005to0.04) was prepared by the low temperature combustion method, we studied on the influence of luminescent properties of the samples from the the calcination temperature, the doping amount of Pr3+ion, the ion supplements. Research shows that the phosphor can be efficiently excited by the blue LED chip due to the excitation peaks located at449、474and487nm respectively and emitting red light which the strongest emission peak located at664nm。We also found that the luminescent properties of the samples decreased obviously when the doping amount of the Pr3+ion is more than2%(mole fraction), the quenching phenomenon occurs; the ion supplements added will improve luminescent performance, the sample added Na+ion has the best luminescence properties. 3) The yellow (reddish) phosphor Sr1-xMoO4:xDy3+,xM+(M=Li、Na、 K, x between0.01to0.05) was prepared by the low temperature combustion method, we studied on the influence of luminescent properties of the samples from the the calcination temperature, the doping amount of Dy3+ion, the ion supplements. The results show that the phosphor can be efficiently excited by the near-ultraviolet and blue LED chips because of the excitation peaks located at298、353、366and387nm respectively. and its strongest emission peak located at575nm,the sample is a potential yellow-reddish phosphor for WLED which can be excited by near-ultraviolet and blue LED chips.It also found that the luminescent properties of the samples decreased obviously when the doping amount of the Dy3+ion is more than5%(mole fraction), the quenching phenomenon occurs;In addition, the ionic supplements added will improve luminescent performance,when the dosage of ionic compensating agent Na+is0.05(mole fraction), the sample obtain the best luminescence performance.