Eu2+/Tb3+掺杂的Sr2Si5N8基荧光粉的制备与发光性能

采用碳热还原氮化法合成了Eu²⁺/Tb³⁺掺杂的Sr₂Si₅N₈基荧光粉, 并重点研究了Tb³⁺-Eu²⁺共掺时Sr₂Si₅N₈基荧光粉的发光性能。研究结果表明: 由于Tb³⁺的f → d间的跃迁是自旋允许的, Sr₂Si₅N₈:Tb³⁺在330 nm激发光下, 在490、543、585和623 nm四处各有一发射峰, 它们分别来源于Tb³⁺的⁵D₄ → ⁷F_j (j = 6、5、4、3)能级跃迁; 掺入Tb³⁺对Sr_1.96Si₅N₈:0.04Eu²⁺的激发谱和发射谱的形状及峰位无明显影响, 当共掺离子Tb³⁺浓度为x = 0.01时, 样品发射强度比未共掺的Sr_1.96Si₅N₈:0.04Eu²⁺提高了约20%, Tb³⁺主要通过电多极能量传递的方式转向Eu²⁺。

Syntheses and Photoluminescence Properties of Eu2+/Tb3+ Doped Sr2Si5N8 Phosphors

Eu²⁺/Tb³⁺ doped Sr₂Si₅N₈ phosphors were prepared by carbothermal reduction and nitridation method. The luminescence of Tb³⁺/Eu²⁺ co-doped Sr₂Si₅N₈ were investigated. The experimental results indicated that owing to spin-allowed f → d transition rule the four emission lines located at 490, 543, 585, and 623 nm which ascribed to the ⁵D₄→⁷F_j (j = 6, 5, 4, 3) transitions were observed under 330 nm excitation. No obvious changes in spectral line shape were observed for Sr₂Si₅N₈:Eu²⁺ co-doped with Tb³⁺. However, the emission intensity was improved by about 20% with Tb³⁺ doping concentration of x = 0.01 mainly because of the electric multipole energy transfer from Tb³⁺ to Eu²⁺.