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中文摘要：
采用共沉淀方法制备了稀土离子Eu3＋,Dy3＋,Sm3＋掺杂的Ca（Sr,Ba）WO4发光材料,目的是研究金属阳离子改变对稀土离子发光性质的影响。X射线衍射光谱数据表明,CaWO4、SrWO4、BaWO4都是四方晶系I41/a（88）结构,随着阳离子半径增大,衍射峰向小角移动。不同温度制备的BaWO4样品X射线衍射光谱数据表明,温度较低时制备的晶体样品X射线衍射峰较宽;当制备温度升高后,晶体样品X射线衍射峰宽变窄。样品的SEM照片表明,低温制备的样品晶粒尺寸较小,约为100~300 nm;高温制备样品晶粒尺寸较大,约为2~6μm。测试了Eu3＋,Dy3＋,Sm3＋掺杂的Ca（Sr,Ba）WO4发光材料的激发和发射光谱。计算了Eu3＋掺杂的Ca（Sr,Ba）WO4的J-O强度参数Ωλ（λ=2,4）,Ω2值随着阳离子半径增大迅速减小,经分析它是导致Eu3＋掺杂的Ca（Sr,Ba）WO4的发射强度随着阳离子半径增大迅速减弱的原因。然而Sm3＋掺杂的SrWO4其他两种晶体相比,其发射强度反而增强。根据激发光谱和文献报道,我们认为可能是由于钨酸根离子与稀土离子的能量传递引起的。从Dy3＋,Sm3＋掺杂的Ca（Sr,Ba）WO4的发射光谱可以看到,随着阳离子半径增大发射峰蓝移,发射峰的Stark劈裂减弱。我们用位形坐标图解释了这一现象产生的原因。
英文摘要：
Eu3＋,Dy3＋,Sm3＋ doped Ca（Sr,Ba）WO4 phosphors were synthesized by the co-precipitation method in order to investigate the effect of different metallic cations on luminescence properties of rare earth ions.The data of X ray diffraction（XRD） indicated that the crystal structures of CaWO4,SrWO4,BaWO4 belong to tetragonal,I41/a（88） and the diffraction peaks moved towards smaller angle with the increasing diameter of the metal cation.The data of X-ray diffraction（XRD） of BaWO4 synthesized under different temperatures showed that the diffraction peaks were broader under lower synthesized temperature,which can be attributed to the smaller particle sizes（about 100~300 nm seen from SEM morphology） of BaWO4 phosphors under lower synthesized temperature.The emission spectrum and excitation spectrum of Eu3＋,Dy3＋,Sm3＋ doped Ca（Sr,Ba）WO4 phosphors were measured.J-O strength parameters Ωλ（λ=2,4） of Eu3＋ ion,were calculated.The data indicated that Ω2 decreased with increasing diameter of the metal cation,which can be used to explain the decrease of emission intensity of Eu3＋ doped Ca（Sr,Ba）WO4 with increasing diameter of the metal cation.However,the emission intensity of Sm3＋ doped SrWO4 phosphors were more stronger than that of Sm3＋ doped Ca（Ba）WO4 which can be explained by the energy transfer between WO2-4 and rare earth ions.It can be seen from the emission spectrum of Dy3＋,Sm3＋ doped Ca（Sr,Ba）WO4 the emission peaks moved towards shorter wavelength and their bandwidths were reduced,which was explained by the configurational coordinate diagram.
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