无机化学学报

沉淀法合成蓝色长余辉发光材料Sr₂MgSi₂O₇∶Eu²⁺，Dy³⁺

Synthesis of Blue Long-Lasting Phosphorescent Material Sr₂MgSi₂O₇∶Eu²⁺, Dy³⁺ by Coprecipitation Method

作者	单位
陈小博	暨南大学化学系，纳米化学研究所，广州 510632
李毅东	暨南大学化学系，纳米化学研究所，广州 510632
艾鹏飞	暨南大学化学系，纳米化学研究所，广州 510632
谭宁会	暨南大学化学系，纳米化学研究所，广州 510632
刘应亮	暨南大学化学系，纳米化学研究所，广州 510632

摘要: 采用沉淀法制备了高亮度的长余辉发光材料Sr₂MgSi₂O₇∶Eu²⁺，Dy³⁺。通过XRD、荧光光谱和热释光谱对其进行表征。XRD测试表明所制备的Sr₂MgSi₂O₇∶Eu²⁺，Dy³⁺为单相，四方晶。荧光光谱测试表明，用λ_em=467 nm作为监控波长，在275~450 nm之间有宽的激发光谱，峰值位于399 nm。用λ_ex=399 nm激发样品，其发射光谱为一宽带，峰值位于467 nm。1 050 ℃煅烧前躯体所制备的Sr₂MgSi₂O₇∶Eu²⁺，Dy³⁺发光性能最好。热释光谱峰值位于357 K，适合长余辉现象的产生。对Sr₂MgSi₂O₇∶Eu²⁺，Dy³⁺长余辉发光机理进行了讨论。

关键词: 共沉淀法长余辉发光硅酸镁锶稀土离子

基金项目:

Abstract: Blue long-lasting phosphorescent materials with high brightness, Sr₂MgSi₂O₇∶Eu²⁺, Dy³⁺, were prepared by coprecipitation method. The products were characterized by XRD, phosphorescent spectra and thermoluminescence spectra. The results of XRD indicated that Sr₂MgSi₂O₇∶Eu²⁺, Dy³⁺ possessed pure phase, tetragonal crystal structure. The excitation spectrum(λ_em=467 nm) and emission spectrum(λ_ex=399 nm) of Sr₂MgSi₂O₇∶Eu²⁺, Dy³⁺ were broad band spectra, and the main excitation peaked at 399 nm, the main emission at 467 nm. The luminescent properties were the best for the as-precipitated precursor powders calcined at 1 050 ℃. The thermoluminescence spectra peaked at 357 K, which is suitable for the generation of long-lasting phosphorescence. The long-lasting phosphorescence mechanism of Sr₂MgSi₂O₇∶Eu²⁺, Dy³⁺ is discussed.

Keywords: coprecipitation method long-lasting phosphorescence strontium magnesium disilicate rare earth ions

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陈小博,李毅东,艾鹏飞,谭宁会,刘应亮.沉淀法合成蓝色长余辉发光材料Sr₂MgSi₂O₇∶Eu²⁺，Dy³⁺[J].无机化学学报,2010,26(1):79-83.

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