CaWO_4:Sm^(3+)荧光粉的发光性质及其能量传递机理  

Luminescent properties and energy transfer mechanism of CaWO_4:Sm^(3+)phosphors

作　　者：毕长虹[1] 孟庆裕[1] 

机构地区：[1]哈尔滨师范大学物理与电子工程学院,光电带隙材料省部共建教育部重点实验室,哈尔滨150025

出　　处：《物理学报》2013年第19期475-481,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51002041);黑龙江省普通高等学校青年学术骨干支持计划(批准号:1252G032);哈尔滨师范大学青年学术骨干资助计划(批准号:11KXQ-06)资助的课题~~

摘　　要：采用沉淀法制备了不同Sm3+掺杂浓度的白钨矿结构CaWO4荧光粉材料.对CaWO4:Sm3+材料的光致发光性质的研究结果表明,在404 nm光照下样品可以实现色纯度较高的红光发射,而短波紫外240 nm光照下除Sm3+的特征发射外还能观察到CaWO4自激发发射,能够获得较强的白光;实验发现Sm3+掺杂浓度为2%时样品的发光强度最高;通过对实验数据的分析确定了Sm3+之间的能量传递类型为电偶极-电偶极相互作用,并计算了能量传递的临界距离大约为2.0 nm.The scheelite-structured CaWO4 phosphors doped with different concentrations of Sm^3＋were prepared by precipitation method. Photoluminescence properties of Sm^3＋-doped CaWO4 samples were studied. Results indicate that red light emission of Sm^3＋ with higher color purity in the samples can be excited by 404 nm blue light. There are 4f-4f intrinsic emission of Sm^3＋ and a strong self-excitation emission of CaWO4 when excited by 240 nm short-wave ultraviolet, and the white light emission can be obtained. Experiments show that the best Sm^3＋doping concentration is 2%. The energy transfer type between Sm^3＋ions was determined to be the electric dipole-electric dipole interaction and the critical energy transfer distance （Dc） was calculated to be 2.0 nm.

关 键 词：光致发光 CaWO4:Sm3+ 荧光寿命 能量传递 

分 类 号：O482.31[理学—固体物理]