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Defect‐Mediated Photoluminescence Dynamics of Eu 3+ ‐Doped TiO 2 Nanocrystals Revealed at the Single‐Particle or Single‐Aggregate Level
Author(s) -
Tachikawa Takashi,
Ishigaki Takamasa,
Li JiGuang,
Fujitsuka Mamoru,
Majima Tetsuro
Publication year - 2008
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200800528
Subject(s) - photoluminescence , exciton , doping , nanocrystal , nanoparticle , particle (ecology) , spectroscopy , excitation , argon , ion , chemistry , nanotechnology , chemical physics , materials science , analytical chemistry (journal) , atomic physics , physics , optoelectronics , condensed matter physics , organic chemistry , quantum mechanics , oceanography , geology
Single‐particle fluorescence spectroscopy was used to investigate defect‐mediated photoluminescence (PL) dynamics of undoped and Eu 3+ ‐doped TiO 2 nanoparticles, and revealed that free excitons in the photoirradiated TiO 2 host can excite both interior and surface Eu 3+ ions, while trapped excitons at the surface only excite the latter. The picture shows PL images of TiO 2 :Eu 3+ nanoparticles during laser excitation in air and argon atmospheres.