Spectroscopic Properties of Nanophase Eu-Doped ZrO2 and Its Potential Application for Fast Temperature Sensing Under Extreme Conditions

Autor:	Hergen Eilers, Ray Gunawidjaja, Thandar Myint
Rok vydání:	2012
Předmět:	Materials science Temperature sensing Doping Analytical chemistry Fluorescence Surfaces Coatings and Films Electronic Optical and Magnetic Materials Tetragonal crystal system General Energy Phase (matter) Physical and Theoretical Chemistry Luminescence Spectroscopy Monoclinic crystal system
Zdroj:	The Journal of Physical Chemistry C. 116:21629-21634
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp307092b
Popis:	Luminescent nanophase europium-doped ZrO2 precursors are subjected to pyroprobe heating with nominal heating rates of 20 000 °C/s for 1 and 10 s to various temperatures. When heated above the crystallization temperature, the material forms tetragonal and monoclinic polymorphs. Optical spectroscopy is used to measure the excitation spectra, fluorescence spectra, and fluorescence lifetimes of the heated samples. These optical signatures are evaluated for their potential as temperature indicators for short heating events. The fluorescence lifetimes and the intensity ratio of two fluorescence peaks appear to be promising temperature indicators. The fluorescence intensity ratio of two peaks at about 591 and 592 nm of the tetragonal polymorph decreases linearly with temperature and the peak position increases linearly with temperature between about 800 and 1300 K. The fluorescence lifetimes of both polymorphs increase with temperature. As the temperature reaches about 1000 K for the tetragonal phase and 1200 K ...
Databáze:	OpenAIRE
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