采用Sol-gel法制备了具有粒径均匀分布的Pr离子单掺SrTiO3:0.002Pr纳米磷光体.通过DTA、XRD和PL对样品的成相过程和晶体结构及其光谱性能进行了测试分析.DTA和XRD分析结果表明:前驱体在较低温度(＜500℃)加热就已经有立方相SrTiO3纳米晶析出,经935℃加热后完全形成单一立方相SrTiO3纳米晶,空间群为Pm-3m(221),经Scherrer公式计算得磷光体的晶粒尺寸约为82 nm.光谱性能研究表明,磷光体的发光性能受烧结温度影响非常明显.对应于Pr离子1D2→3H4能级跃迁的红色发光强度随着烧成温度从600℃升高到1300℃过程中逐渐增大,但发射谱的形状和主峰位置均保持不变.
Ultra-fine and nanocrystalline Pr doped SrTiO3:0.002Pr phosphor was prepared by sol-gel method.The phase formation and luminescent property of the samples were characterized by differential thermal analysis(DTA),X-ray diffraction(XRD)and spectrophotometer.The results of DTA and XRD showed that prepared gels began to transform into the strontium titanate with cubic perovskite phase by heat treatment at 500℃and the reaction was completed approximately at about 935℃.At 935℃the grain size was estimated to be about 82 nm through Scherrer's formula.The luminescent results showed a strong dependence of the luminescent intensity on heating temperature for the gels.The red emission peak at 617 nm was attributed to1D2→3H4 of Pr3+ ions,which increased gradually as the calcination temperature rose from 600℃to 1300℃.The luminescent intensity at 1300℃was enhanced about 7.4 times compared with that obtained at 600℃.However,the site and shape of emission peak remained.
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