Department of Physics, CICECO, University of Aveiro, Portugal.
J Phys Chem B. 2010 Jan 14;114(1):77-83. doi: 10.1021/jp908563d.
Three different types of photoluminescent hybrid materials containing trivalent lanthanide (Ln(3+) = Eu(3+), Tb(3+)) ions, chitosan, and silica have been prepared with different structural features. The different silica sources lead to diverse microstructures of hybrid materials, with silica being homogeneously dispersed in the chitosan materials (LnChS-H), or forming a core-shell morphology. Postsynthesis treatment is necessary for embedding the luminescent probe. The Ln(3+)-based materials have been investigated by photoluminescence spectroscopy (12-300 K). The chitosan-Eu(3+)-related local environment is maintained in the EuChS-H hybrid material. The emission features of the core-shell materials are characterized by the presence of two Eu(3+) distinct local environments, one associated with the chitosan core and the other with the silica shell.
三种不同类型的含三价镧系元素（Ln(3+) = Eu(3+)，Tb(3+)）离子、壳聚糖和二氧化硅的光致发光杂化材料，具有不同的结构特征。不同的二氧化硅来源导致杂化材料具有不同的微观结构，二氧化硅均匀分散在壳聚糖材料中（LnChS-H），或形成核壳形态。后合成处理对于嵌入发光探针是必要的。通过荧光光谱法（12-300 K）对 Ln(3+)基材料进行了研究。EuChS-H 杂化材料中保持了壳聚糖-Eu(3+)相关的局部环境。核壳材料的发射特征表现为两个不同的 Eu(3+)局部环境，一个与壳聚糖核有关，另一个与二氧化硅壳有关。
