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Upconverting Nanoparticles for Nanoscale Thermometry
Author(s) -
Fischer Lorenz H.,
Harms Gregory S.,
Wolfbeis Otto S.
Publication year - 2011
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.201006835
Subject(s) - materials science , luminescence , nanometre , nanoscopic scale , nanoparticle , wavelength , optoelectronics , infrared , nanotechnology , optics , physics , composite material
Upconverting materials are capable of absorbing near‐infrared light and converting it into short‐wavelength luminescence. The efficiency of this remarkable effect is highly temperature dependent and thus can be used for temperature determination (thermometry) on a nanometer scale. All the upconverting materials discovered so far display several (mainly two) narrow emission bands, each of which has its own temperature dependence. The ratio of the intensity of two of these bands provides a referenced signal for optical sensing of temperature, for example inside cells.