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Local‐field effect on the fluorescence relaxation of Tm 3+ :LaF 3 nanocrystals immersed in liquid medium
Author(s) -
He Enjie,
Zheng Hairong,
Zhang Xisheng,
Qu Shixian
Publication year - 2009
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.1146
Subject(s) - nanocrystal , fluorescence , relaxation (psychology) , ion , materials science , doping , hydrothermal circulation , analytical chemistry (journal) , atomic physics , chemical physics , nanotechnology , chemistry , optics , chemical engineering , optoelectronics , physics , psychology , social psychology , organic chemistry , engineering , chromatography
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. Copyright © 2009 John Wiley & Sons, Ltd.