摘要
采用高温固相法合成了一系列Sm^(3+)浓度(x)掺杂的BaLaLiTeO_(6):x Sm^(3+)橙红色荧光粉,并对样品的晶体结构、发光性能、衰减寿命及热稳定性进行探究。数据结果显示BaLaLiTeO_(6):Sm^(3+)荧光粉归属于双层钙钛矿结构,其晶系类型为四方晶系(空间群:I4/m)。在404 nm的近紫外光照射下,发射光谱于550~680 nm呈现出一个三峰发射。Sm^(3+)的最佳掺杂量为0.09,超过此值后,受到偶级与偶级相互作用的影响,样品出现显著的荧光猝灭现象。荧光寿命随着Sm^(3+)掺杂浓度的不断增加而降低,这主要是由非辐射跃迁的概率大幅度提高造成的。由于热猝灭效应,荧光强度会随着温度的不断升高而降低,但150℃时的发射光谱积分强度仍能达到25℃时的82.8%。另外,样品活化能为ΔE=0.31257 eV,证明其具有良好的热稳定性。因此BaLaLiTeO_(6):Sm^(3+)可作为橙红色荧光粉在发光领域有潜在的应用价值。
A series of orange-red phosphors BaLaLiTeO_(6):x Sm^(3+)with different Sm^(3+)concentration(x)was synthesized and their crystal structure,photoluminescence properties,lifetime and thermal stability were studied.The results show that it features double-perovskite structure with tetragonal space group I4/m.Under 404 nm excitation,BaLaLiTeO_(6):x Sm^(3+)can emit three peaks in the range of 550~680 nm.The optimized concentration of Sm^(3+)is 0.09.When x is over than 0.09,the concentration quenching happens due to the dipole-dipole interaction.The luminescent lifetime will be steadily reduced due the increasing probability of non-radiative transition.The luminescent intensity will be gradually reduced due to temperature quenching effect,but it remains 82.8%of the intensity of that at 25℃at 150℃.Moreover,the activation energy isΔE=0.31257 eV,which demonstrates that BaLaLiTeO_(6):Sm^(3+)is of high thermal stability.Consequently,BaLaLiTeO_(6):Sm^(3+)has potential application value in the field of luminescent material as an orange-red phosphor.
作者
王博昊
赵丹
WANG Bohao;ZHAO Dan(School of Chemistry and Chemical Engineering,Henan Polytechnic University,Jiaozuo 454000,China)
出处
《聊城大学学报（自然科学版）》
2023年第3期74-81,共8页
Journal of Liaocheng University:Natural Science Edition
基金
国家自然科学基金面上项目(22075070)资助。
关键词
高温固相法
Sm^(3+)
热稳定性
high temperature solid state reaction
Sm^(3+)
thermal stability
