红色荧光粉Na8.33 La1.67(SiO4)6 O2:Eu3+的制备及发光特性

采用高温固相法制备了Na_(8. 33)La_(1. 67)(SiO_4)_6O_2∶Eu~(3+)红色发光材料,利用X射线衍射仪测定其晶体结构,利用Hitachi F4600表征其发光光谱。在紫外光激发下,样品Na_(8. 33)La_(1. 67)(SiO_4)_6O_2∶Eu~(3+)呈多峰发射,分别对应于Eu~(3+)的~5D_0-~7F_j(j=0,1,2,3,4)能级跃迁,主峰是位于615 nm的~5D_0-~7F_2跃迁发射。研究了Eu~(3+)掺杂浓度对材料发光性质的影响,改变Eu~(3+)掺杂浓度,样品的发射强度随之改变,Na_(8. 33)La_(1. 67)(SiO_4)_6O_2∶Eu~(3+)材料的Eu~(3+)浓度为15%时,发光强度最大。讨论了浓度猝灭的机理,理论计算表明引起Eu~(3+)离子能量弥散的主要原因是离子间交换相互作用。

Synthesis and Luminescence Properties of Red Phosphor Na8.33La1.67(SiO4)6O2: Eu3+

Europium(Ⅲ)-doped Na_8.33La_1.67(SiO₄)₆O₂ have been synthesized by solid stated method. The crystal structure has been detected by X-ray diffractometer and the photoluminescence properties have been obtained on Hitachi F4600. Under UV excitation, the emission of Na_8.33La_1.67-(SiO₄)₆O₂:Eu³⁺ cover some sharp lines corresponding to the transitions of ⁵D₀-⁷F_j(j=0, 1, 2, 3, 4), with the highest intensity at 615 nm ascribed to the transition of ⁵D₀-⁷F₂. Moreover, the emission intensity changes with the concentration of Eu³⁺. As the concentration is 15%, the optimal emission is obtained, which is concentration quenching. The phenomenon is due to the energy migration between Eu³⁺ ions. And the interaction mechanism between Eu³⁺ ions is calculated, which is exchange interaction.