共掺Tm~(3+)离子对CaAlSiN_3∶Eu~(2+)红色荧光粉发光性能的影响

通过高温固相法,合成了Eu~(2+)单掺和Eu~(2+)、Tm~(3+)共掺CaAlSiN_3荧光粉。结合荧光光谱、余辉发射光谱和余辉衰减曲线及热释发光等测试手段对其进行了表征分析。结果表明,CaAlSiN_3∶Eu~(2+)具有主峰位于630 nm的明显的红色长余辉发光;共掺杂Tm~(3+)离子的引入,产生了654和800 nm的荧光和余辉,同时,Tm~(3+)的共掺,使CaAlSiN_3∶0.1%Eu~(2+),Tm~(3+)样品位于89.0℃热释光峰位消失,表明Tm~(3+)共掺杂改变了CaAlSiN_3∶Eu~(2+)荧光粉中的陷阱能级及其分布,从而减弱了CaAlSiN_3∶Eu~(2+)的630 nm红色可见光部分余辉发光性能。

Influence of Tm3+ Codopant on Luminescence Properties of CaAlSiN3:Eu2+ Phosphor

A series of Eu²⁺ single doped and Tm³⁺ co-doped CaAlSiN₃ phosphors were synthesized by high temperature solid-reaction method. Photoluminescence, afterglow emission and thermoluminescence glow curve investigations indicate that CaAlSiN₃:0.1%Eu²⁺ sample possesses excellent photoluminescence properties with broad emission band located at about 630 nm. The introduction of Tm³⁺ codopant creates new emission bands located 654 nm and 800 nm, respectively, which are originated from Tm³⁺ in CaAlSiN₃ matrix. However, the Tm³⁺ codopant causes the disappearance of 89.0 ℃ thermoluminescence glow peak, which indicates that the introduction of Tm³⁺ has changed the defect distribution and their concentrations, thus deceasing the visible 630 nm red light afterglow of CaAlSiN₃:Eu²⁺.