摘要
采用简单的液相法合成了SiO2/LaF3:Eu3+核壳结构发光粒子,并对其结构及发光性能进行了表征.XRD分析表明包覆层LaF3:Eu3+为立方晶相结构,红外光谱表明SiO2颗粒表面有柠檬酸的修饰,电镜照片表明合成了球形的核-壳结构的复合粒子,包覆层厚度为10～20nm,光谱测试表明核-壳复合粒子与纯的LaF3:Eu3+具有相同的发光性能,均以589nm附近的5D0—7F1磁偶极跃迁为最强发射峰,说明Eu3+在LaF3基质中占据的格位相同.
SiO2/LaF3：Eu3＋ core-shell structural luminescence particles were prepared by a wet method, and the structure and luminescence properties were characterized. XRD patterns showed that the coated LaF3：Eu3＋ layer took a cubic crystal phase. FTIR spectra indicated that the citric acid was modified on the silica surface. TEM images presented that the core-shell composite particles were all in sphere shape, and the coating layer was about 10~20 nm. The photoluminescence properties were shown to be the same as those of the pure LaF3：Eu3＋, and the strong emission peak is near 589 nm which is corresponding to 5D0-7F1 magnetic dipole transition of Eu3＋, suggesting that Eu3＋ is located at the same lattice phase in both the core-shell particles and the pure particles.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2008年第19期2170-2173,共4页
Acta Chimica Sinica
基金
国家自然科学基金(No.40675083)资助项目
