荧光粉
材料科学
离子
发光
碱金属
猝灭(荧光)
补偿(心理学)
热的
电荷(物理)
光电子学
光学
荧光
热力学
化学
物理
心理学
有机化学
量子力学
精神分析
作者
Fangyi Ruan,Guodong Fan,Nan Li,Jianfeng Zhou,Ying Li,Di Fan,Qianqian Chen,Zhenyu Lin
标识
DOI:10.1016/j.ceramint.2024.01.194
摘要
A series of novel phosphors, specifically Eu3+-doped and Eu3+/M+ co-doped (M = Li+, Na+, K+) SrLaNaTeO6, were synthesized via a high-temperature solid-state process. The luminous properties and thermal stability of these phosphors were thoroughly investigated. When subjected to the appropriate excitation wavelengths (395 and 465 nm), all phosphors demonstrate a pronounced red light emission, corresponding to the 5D0→7F2 transition of Eu3+. The researchers found that the most effective concentration of Eu3+ doping in the Sr1-xLaNaTeO6:xEu3+ phosphor was discovered to be x = 0.25. It was shown that excessive doping leads to concentration quenching, which can be attributed to the energy transfer interaction between Eu3+ ions. The incorporation of Li+, Na+, and K+ as charge compensation ions in conjunction with Eu3+ in Sr0.75LaNaTeO6:0.25Eu3+ phosphor leads to a notable enhancement in light intensity. Notably, the phosphor co-doped with Na+ exhibits the highest luminous intensity among the alkali metal charge compensation ions. The near proximity of the ion radius of the charge compensation ion Na+ to that of Sr2+ in the host facilitates the occupation of the Na + ion in the Sr2+ lattice location. Sodium ions (Na+) have the ability to counteract the positive defects resulting from the substitution of europium ions (Eu3+) with strontium ions (Sr2+), hence maintaining charge neutrality. Additionally, it should be noted that Sr0.5LaNaTeO6:0.25Eu3+,0.25Na+ phosphor exhibits a remarkable quantum yield of 71.26 % and lacks thermal quenching. These characteristics suggest that this particular phosphor holds promising potential for utilization in developing white-light-emitting diodes.
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