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Direct Evidence of a Surface Quenching Effect on Size‐Dependent Luminescence of Upconversion Nanoparticles
Author(s) -
Wang Feng,
Wang Juan,
Liu Xiaogang
Publication year - 2010
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.201003959
Subject(s) - quenching (fluorescence) , luminescence , photon upconversion , nanoparticle , doping , surface (topology) , materials science , nanotechnology , layer (electronics) , optoelectronics , fluorescence , optics , physics , mathematics , geometry
A series of Yb/Tm co‐doped NaGdF 4 nanoparticles without or with a thin surface protection layer provide direct evidence of a surface quenching effect on size‐dependent upconversion luminescence (see picture). The coating preserves the optical integrity of the nanoparticles (right‐hand spectrum) and minimizes emission loss induced by surface quenching.