单掺杂和共掺杂氟化物纳米晶体的发光特性

基质结构的变化为掺杂稀土发光离子提供了不同的局域环境,从而为改变和影响掺杂离子的光发射性质提供了条件。本文采用激光光谱学的方法从实验上研究了基质变化对氟化物纳米晶体中的掺杂稀土Eu3+和Pr3+的光发射性质的影响规律,以及同一基质中单掺杂和共掺杂稀土离子的光发射特性。结果发现:可通过变换基质和离子共掺杂来实现荧光谱线强度和色纯度的改进。依据掺杂离子的能级结构以及纳米晶体基质的对称性变化等因素,对所观测到的实验现象进行了分析讨论。

Luminescence Property of Single Doped and Co-doped Fluoride Nanocrystals

The change of matrix structure can provide different local environment for doped rare earth ions, which offers us an effective way to adjust the luminescence property of active ions. In current paper, the influence of the matrix structure on the luminescence properties of Pr3+ and Eu3+ doped fluoride nanoaprticles has been investigated with laser spectroscopic method. The characters of fluorescence emission from single doped and co-doped nanoparticles have been studied too. It was found that the intensity and the color purity of the fluorescence emission were improved greatly by co-doping another kind of ion to the doped nanoparticles as well as by changing the matrix of the nanoaprticles. The experimental observations were discussed based on the energy level structure of doped ions and the symmetry characteristics of nanocrystals.