纳米晶CaWO_4∶Dy^(3+)的制备和发光性质的研究  

Preparation and luminescent properties of nanocrystalline CaWO_4∶Dy^(3+)

作　　者：姜晓岚[1] 吕树臣[2] 张义勇[1] 

机构地区：[1]东北石油大学电子科学学院,黑龙江大庆163318 [2]哈尔滨师范大学先进功能材料与激发态黑龙江省重点实验室,黑龙江哈尔滨150080

出　　处：《光学仪器》2012年第4期90-94,共5页Optical Instruments

基　　金：国家自然科学基金资助项目(51101027);黑龙江省教育厅科技项目(12511004)

摘　　要：使用共沉淀法制备了纳米晶CaWO4∶Dy3+发光粉体。通过对比不同煅烧温度下样品的发射谱,发现所制备样品均可观测到Dy3+离子的强室温特征发射。用基质吸收峰和353nm分别激发纳米晶CaWO4∶Dy3+,由其发射谱可推测出样品中的基质和Dy3+离子之间存在能量传递。给出了纳米晶CaWO4∶Dy3+的发光机制图并且从微观解释了基质和稀土离子之间的能量传递。通过对比不同掺杂浓度下Dy3+离子发射光谱,发现将Dy3+掺杂到CaWO4基质中会发生浓度猝灭。The nanocrystalline CaWO4 ∶ Dy3＋ samples were prepared by co-precipitation method.With the comparison of emission spectrums of CaWO4 ∶ Dy3＋ annealed at different temperature,the sharp characteristic emissions were found in all samples.With the comparison of emission spectra of CaWO4 ∶ Dy3＋ excited by the absorption peak of the host and 353 nm,the energy transfer was observed between the nanocrystalline CaWO4 host and the rare earth ions Dy3＋.The photoluminescence schematic diagram of CaWO4 ∶ Dy3＋ was obtained and the energy transfer was explained from micro-structure.The effect of the doped Dy3＋ concentration on the fluorescence emission intensity was discussed,and the results showed the concentration quenching depended on the doped Dy3＋ concentration.The optimum concentration for the luminescence of Dy3＋ is determined to be 1 mol%.

关 键 词：共沉淀法 光致发光 CaWO4∶Dy3+ 

分 类 号：O469[理学—凝聚态物理] O647[理学—电子物理学]