College of Physics and Information Technology, Shaanxi Normal University, Xi'an, People's Republic of China.
Luminescence. 2010 Jan-Feb;25(1):66-70. doi: 10.1002/bio.1146.
Tm(3+):LaF(3) nanocrystals were synthesized with hydrothermal technique. Local-field effect on the radiative relaxation rate was studied in the system of Tm(3+):LaF(3) nanocrystals immersed in several liquid media. The fluorescence lifetime was measured. It was found that the fluorescence decay presented the characteristics of second-order exponential decay, for which the contribution from the ions inside the nanocrystal and ions at the interface of the nanocrystal were distinguished. Investigating the experimental results with proposed models, we found that the surface effect had to be eliminated. For rare earth doped LaF(3) nanocrystals, real-cavity model well explains the influence of surrounding medium on the fluorescence relaxation rate.
采用水热法合成了 Tm(3+)：LaF(3)纳米晶体。研究了浸入几种液体介质中的 Tm(3+)：LaF(3)纳米晶体系统中局部场对辐射弛豫率的影响。测量了荧光寿命。结果发现，荧光衰减呈现二阶指数衰减的特征，可将其归因于纳米晶体内的离子和纳米晶界面处的离子的贡献。通过所提出的模型研究实验结果，我们发现必须消除表面效应。对于稀土掺杂的 LaF(3)纳米晶体，实腔模型很好地解释了周围介质对荧光弛豫率的影响。
