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High photoluminescence quantum yield of TiO 2 nanocrystals prepared using an alcohothermal method
Author(s) -
Li Yanting,
Song Cuihong,
Wang Yunqing,
Wei Yu,
Wei Yongju,
Hu Yuzhu
Publication year - 2007
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.997
Subject(s) - photoluminescence , quantum yield , nanocrystal , yield (engineering) , materials science , quantum , nanotechnology , chemical engineering , optoelectronics , physics , quantum mechanics , metallurgy , engineering , fluorescence
Highly dispersible TiO 2 nanocrystals (∼6 nm) were prepared by an alcohothermal method. A strong and stable photoluminescence emission with a maximum at 450 nm was observed in the original TiO 2 nanocrystals colloid. Compared with the emission from quinine sulphate in 0.05 mol/L sulphuric acid, the emission quantum yield of TiO 2 nanocrystals was determined to be about 0.20, which was much higher than the values (0.002 and 0.001) reported in previous studies. The fluorescence micrograph of TiO 2 nanocrystals encapsulated in lipsomes shows that TiO 2 nanocrystals prepared in such a way have potential application as a fluorescence probe in biological imaging. Research on the luminescence mechanism indicates that the surface state and extent of crystallization of the TiO 2 nanocrystals are crucial factors in the high photoluminescence quantum yield obtained in this study. Copyright © 2007 John Wiley & Sons, Ltd.