Gd_2(WO_4)_3∶Eu^(3+),Sm^(3+)纳米晶的制备及Sm3+对Eu3+特征发射的敏化作用  

Preparation of Nanocrystalline Gd_2(WO_4)_3∶Eu^(3+),Sm^(3+) and The Sensitization of Sm^(3+) to Eu^(3+) Characteristic Emission

作　　者：何冬丽[1] 吕树臣[1] 曲秀荣[1] 毛金伟[1] 孟庆裕[1] 

机构地区：[1]哈尔滨师范大学光电带隙材料省部共建教育部重点实验室,黑龙江哈尔滨150025

出　　处：《发光学报》2013年第2期171-177,共7页Chinese Journal of Luminescence

基　　金：黑龙江省教育厅科学技术研究重点项目(12511z013);国家自然科学基金(51002041)资助项目

摘　　要：采用共沉淀法分别制备了Eu3+、Sm3+单掺和共掺Gd2(WO4)3纳米发光材料,对所制备的纳米发光材料的结构和发光特性进行了研究。结果表明:所得样品为Gd2(WO4)3的底心单斜结构,Eu3+的摩尔分数为20%时,Gd2(WO4)3∶20%Eu3+的发光最强。Sm3+对Eu3+有敏化作用,使Eu3+的5D0→7F2发射明显增强。用464 nm的光激发时,Sm3+对Eu3+的敏化作用强于用395 nm的光激发。Sm3+的摩尔分数为5%时,样品Gd2(WO4)3∶20%Eu3+,5%Sm3+的5D0→7F2发射强度最大。Sm3+的掺入使监测Eu3+的5D0→7F2跃迁的激发光谱强度明显增大,且拓宽了可被LED有效激发的波长范围。在405 nm和440 nm波长的光激发下,也可以明显观察到样品Gd2(WO4)3∶20%Eu3+,5%Sm3+中Eu3+的5D0→7F2跃迁。Eu3＋,Sm3＋ doped and co-doped Gd2（WO4）3 nanocrystalline powders were prepared by chemical co-precipitation method,respectively.The structure and luminescent properties of nanocrystalline Gd2（WO4）3∶Eu3＋ and Gd2（WO4）3∶Eu3＋,Sm3＋ were studied by using XRD and fluorescence spectrophotometer.The results show that the crystal phase of the samples as prepared is base centered monoclinic structure.When the mole fraction of Eu3＋ is 20%,the luminescent intensity of Eu3＋ is the greatest.Sm3＋ sensitized Eu3＋ in the samples Gd2（WO4）3∶Eu3＋,Sm3＋.The sensitized effect of Sm3＋ on Eu3＋ was more obvious when the sample Gd2（WO4）3∶Eu3＋,Sm3＋ was excited by 464 nm light than by 395 nm light.Sm3＋ can realize the energy transfer from Sm3＋ to Eu3＋,making the emission of 5D0→7F2 more strength.When the mole fraction of Sm3＋ was 5%,the luminescent intensity of the sample Gd2（WO4）3∶20%Eu3＋,5%Sm3＋ was the greatest.The transition of 5D0→7F2 was clearly observed under 405 nm or 440 nm excitation.Therefore,Eu3＋ and Sm3＋ co-doped in the matrix Gd2（WO4）3 greatly expanded the range of the wavelength of the excitation light source.

关 键 词：共沉淀法 能量传递 光致发光 

分 类 号：O482.31[理学—固体物理]