摘要
四方晶系的钼酸盐是有效的自激活发光材料,但常用的制备方法高温固相法会造成产物团聚不均匀等缺点.通过一步水热法制备具有良好结晶性且形貌均一的NaLa(MoO_(4))_(2)荧光粉.详细探讨前驱体溶液的酸碱度对晶体结构和形貌的影响.研究表明当pH>3.5后产品均为纯的四方晶相,且在pH=5.5时呈均匀球状.通过调节NaLa(MoO_(4))_(2)中Tb^(3+)/Eu^(3+)离子的掺杂浓度,可以获得绿、黄绿、黄和红橙等多种不同颜色的光.能量传递过程主要表现为电偶极-四极相互作用.变温荧光测试数据显示铕铽共掺的NaLa(MoO_(4))_(2)具有很好的温度稳定性.以上结果表明,此荧光粉有望成为具有优异性能的多色可调荧光材料.
Tetragonal molybdate is an effective self-activated luminescent material.However,synthesizing by high-temperature solid-state techniques may cause the agglomeration and uneveness of the products.In this paper,crystallized NaLa(MoO_(4))_(2)microcrystals with uniform morphologies were successfully prepared via a facile hydrothermal method.The influence of pH on the structure and morphology of NaLa(MoO_(4))_(2)was discussed in detail.The results show that the products demonstrated pure tetragonal structure with the pH value higher than 3.5,and uniform microsphere can be obtained at pH=5.5.By adjusting the relative doping concentration of Tb^(3+) and Eu^(3+) ions in NaLa(MoO_(4))_(2),the different colors,i.e.,green,green-yellow,yellow and orange can be acquired.The energy transfer mechanism is demonstrated to be the dipole-quadrupole interaction,while the temperature-dependent luminescence properties show that the thermal stability of phosphor is excellent.These results indicate that these phosphors might have potential applications in tunable fluorescent materials.
作者
李明凤
陈治锴
赵山山
陈欢
宁张磊
毕剑
高道江
白芳
LI Mingfeng;CHEN Zhikai;ZHAO Shanshan;CHEN Huan;NING Zhanglei;BI Jian;GAO Daojiang;BAI Fang(College of Chemistry and Materials Science,Sichuan Normal University,Chengdu 610066,Sichuan;Key Laboratory of Green Process and Engineering,Institute of Process Engineering,CAS,Beijing 100190)
出处
《四川师范大学学报（自然科学版）》
CAS
2022年第2期240-245,共6页
Journal of Sichuan Normal University（Natural Science）
基金
国家重点研发计划课题(2017YFC0504903)
四川省教育厅重点项目(18ZA0408)。
关键词
荧光粉
制备
光致发光
phosphor
synthesis
photoluminescence
