title: Local-field effect on the fluorescence relaxation of Tm3+:LaF3 nanocrystals immersed in liquid medium.
abstract: 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.
authors.affiliation: College of Physics and Information Technology, Shaanxi Normal University, Xi'an, People's Republic of China.
authors.forename: Enjie
authors.initials: E
authors.lastname: He
authors.forename: Hairong
authors.initials: H
authors.lastname: Zheng
authors.forename: Xisheng
authors.initials: X
authors.lastname: Zhang
authors.forename: Shixian
authors.initials: S
authors.lastname: Qu
mesh_terms: D001554:Benzene / Q000737:chemistry; D002246:Carbon Disulfide / Q000737:chemistry; D000431:Ethanol / Q000737:chemistry; D005453:Fluorescence; D005459:Fluorides / Q000737:chemistry*; D005990:Glycerol / Q000737:chemistry; D007811:Lanthanum / Q000737:chemistry*; D008163:Luminescent Measurements; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D013932:Thulium / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; C083668:lanthanum trifluoride; D000431:Ethanol; D007811:Lanthanum; D013932:Thulium; D001554:Benzene; D005990:Glycerol; D005459:Fluorides; D002246:Carbon Disulfide