新型Ba3SiO5:Eu荧光粉的合成及光谱性质

以BaCO_3、SiO_2、Eu_2O_3为原料在还原气氛下采用高温固相法制备了Ba_3SiO_5∶Eu荧光粉体。实验结果表明,制备Ba_3SiO_5的最佳工艺条件是Ba/Si比为3,1 200℃保温4 h。光谱分析表明,Ba_3SiO_5∶Eu荧光粉在254,365,410 nm激发下发射主峰为566 nm(Eu~(2+)的4f~n~(-1)5d→4f~n)宽带发射,量子效率分别为70%、50%、10%,荧光寿命为百纳秒级;以566 nm为监视波长测得激发谱为主峰在250～450 nm范围内的宽带发射,主峰为360 nm,且在410 nm出现小峰; Eu离子最佳掺杂浓度为5%,由发光强度随掺杂离子浓度变化曲线,可以得出Ba_3SiO_5中Eu离子能量传递是基于电四级-电四级作用。

Synthesis and Photoluminescent Properties of Ba3SiO5:Eu Phosphor

Ba₃SiO₅:Eu phosphor was synthesized by solid-state reaction method at a mild reducing atmosphere. BaCO₃, SiO₂,Eu₂O₃ were the raw materials. The results show that the optimized fabrication condition for Ba₃SiO₅ is that Ba/Si atomic ratio should equal to 3, annealed temperature should be 1 200℃. Under 254, 365, 410 nm excitation, Ba₃SiO₅:Eu phosphor would give out broadband emission(centered at 566 nm, related to Eu ion 4f^n-15d→4fⁿ), and the absolute PL quantum yields are 70%, 50%, 10% respectively. The photoluminescent lifetime is 10² ns. The excitation monitored by 566 nm has a broadband emission in the range of 250-450 nm centered at 360 nm, with a small peak at 410 nm. The optimal Eu dopant content is 5%. From the curve of luminescent intensity vs. dopant content, the energy transfer way of activator in Ba₃SiO₅ can be deduced as electric quadrupole-quadrupole interaction.