CaWO4：Sm3+荧光粉的发光性质及其能量传递机理

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. 关键词： 光致发光 4：Sm³⁺')" href="#">CaWO₄：Sm³⁺ 荧光寿命 能量传递

Luminescent properties and energy transfer mechanism of CaWO4:Sm3+phosphors

The scheelite-structured CaWO₄ phosphors doped with different concentrations of Sm³⁺ were prepared by precipitation method. Photoluminescence properties of Sm³⁺-doped CaWO₄ samples were studied. Results indicate that red light emission of Sm³⁺ with higher color purity in the samples can be excited by 404 nm blue light. There are 4f-4f intrinsic emission of Sm³⁺ 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 Sm³⁺ doping concentration is 2%. The energy transfer type between Sm³⁺ ions was determined to be the electric dipole-electric dipole interaction and the critical energy transfer distance (D_c) was calculated to be 2.0 nm.
Keywords： photoluminescence 4：Sm³⁺')" href="#">CaWO₄：Sm³⁺ fluorescent lifetime energy transfer