Si3N4掺杂氮化对Sr3SiO5:Eu2+荧光粉发光性能的影响

采用高温固相法制备Si₃N₄掺杂氮化Sr_2.99SiO_5-6xN_4x:0.01Eu²⁺荧光粉。采用XRD、EDS和SEM测试结果表明: N^3-进入Sr₃SiO₅基质晶格中取代部分O^2-离子, 形成了单一相Sr_2.99SiO_5-6xN_4x:0.01Eu²⁺固溶体。PL&PLE荧光光谱测试结果显示, Sr_2.99SiO_5-6xN_4x:0.01Eu²⁺荧光粉在344nm紫外光的激发下发射出红橙光, 属于Eu²⁺离子典型的 4f⁶5d¹→4f⁷电子跃迁。随着N浓度的增加, Sr_2.99SiO_5-6xN_4x:0.01Eu²⁺荧光粉发射光谱和激发光谱的强度明显增强。热稳定性测试结果表明, Si₃N₄掺杂氮化能够显著提高Sr₃SiO₅:Eu²⁺荧光粉的热稳定性。通过Arrhennius模型拟合结果表明横向穿越过程(crossover)引起的Sr₃SiO₅:Eu²⁺荧光粉氮化前后的温度猝灭。

Luminescence Properties of Si3N4 Doped Nitride Sr3SiO5: Eu2+ Phosphor

Si₃N₄ doped Sr_2.99SiO_5-6xN_4x:0.01Eu²⁺ phosphorssampless were prepared by high temperature solid-state reaction method. Testing results of XRD, EDS and CHNS of the phosphor samples demonstrated that the nitrogen atoms could be incorporated into the host lattice of Sr₃SiO₅ through partial occupation of the oxygen atoms sites to form Sr_2.99SiO_5-6xN_4x:0.01Eu²⁺solid solution. Under the excitation of 344 nm ultraviolet, the Sr_2.99SiO_5-6xN_4x: 0.01Eu²⁺ phosphor samples emit orange lights peaked at 580 nm, which originates from 4f⁶5d¹→4f⁷ transitions of Eu²⁺ ions. With the increase of N³⁺-ions concentration, the intensities of emission and excitation spectra of Sr_2.99SiO_5-6xN_4x: 0.01Eu²⁺ phosphor samples are obviously enhanced. The thermal stability testing results of the phosphor samples show that the incorporation of N^3- ions significantly improve the thermal stability better than that of undoped samples. The curves analyzed and fitted by the Arrhennius formula model indicate that the quenching temperature is caused by crossover process.