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Surface thermometry in combustion diagnostics by sputtered thin films of thermographic phosphors

Pareja, Jhon and Litterscheid, Christian and Kaiser, Bernhard and Euler, Matthias and Fuhrmann, Norman and Albert, Barbara and Molina, Alejandro and Ziegler, Juergen and Dreizler, Andreas (2014):
Surface thermometry in combustion diagnostics by sputtered thin films of thermographic phosphors.
In: Applied Physics B-Lasers and Optics, Springer Berlin Heidelberg, pp. 85-93, 117, ISSN 0946-2171,
[Online-Edition: http://link.springer.com/article/10.1007%2Fs00340-014-5803-4],
[Article]

Abstract

The accuracy and robustness of the thermographic phosphors (TP) technique relies in the use of coatings with low thickness, high-intensity luminescent emission and high adhesion to the surfaces. Sputter deposition has been evaluated as an alternative for coating preparation of TPs for surface thermometry in combustion diagnostics. Thin films of Gd3Ga5O12:Cr3+ have been deposited on fused silica and stainless steel substrates by radio frequency magnetron sputtering. Physical, chemical, and temperature-dependent luminescence properties of the phosphor films have been evaluated using X-ray diffraction, X-ray photoelectron spectroscopy and laser-induced luminescence, respectively. The results showed that the luminescence features of the thin films must be activated by heat treatment after sputter deposition. The Gd3Ga5O12:Cr3+ films exhibited appropriate temperature sensitivity with adequate precision of the temperature determination, proving to be suitable for pointwise (0D) surface thermometry. An evaluation of the spatial homogeneity of the luminescence properties, which has not been yet addressed in the literature for thin films of TPs, revealed that thin Gd3Ga5O12:Cr3+ films deposited on fused silica can be used for spatially resolved surface thermometry while those deposited on stainless steel require improvements to overcome spatial inhomogeneities of the luminescence lifetimes.

Item Type: Article
Erschienen: 2014
Creators: Pareja, Jhon and Litterscheid, Christian and Kaiser, Bernhard and Euler, Matthias and Fuhrmann, Norman and Albert, Barbara and Molina, Alejandro and Ziegler, Juergen and Dreizler, Andreas
Title: Surface thermometry in combustion diagnostics by sputtered thin films of thermographic phosphors
Language: English
Abstract:

The accuracy and robustness of the thermographic phosphors (TP) technique relies in the use of coatings with low thickness, high-intensity luminescent emission and high adhesion to the surfaces. Sputter deposition has been evaluated as an alternative for coating preparation of TPs for surface thermometry in combustion diagnostics. Thin films of Gd3Ga5O12:Cr3+ have been deposited on fused silica and stainless steel substrates by radio frequency magnetron sputtering. Physical, chemical, and temperature-dependent luminescence properties of the phosphor films have been evaluated using X-ray diffraction, X-ray photoelectron spectroscopy and laser-induced luminescence, respectively. The results showed that the luminescence features of the thin films must be activated by heat treatment after sputter deposition. The Gd3Ga5O12:Cr3+ films exhibited appropriate temperature sensitivity with adequate precision of the temperature determination, proving to be suitable for pointwise (0D) surface thermometry. An evaluation of the spatial homogeneity of the luminescence properties, which has not been yet addressed in the literature for thin films of TPs, revealed that thin Gd3Ga5O12:Cr3+ films deposited on fused silica can be used for spatially resolved surface thermometry while those deposited on stainless steel require improvements to overcome spatial inhomogeneities of the luminescence lifetimes.

Journal or Publication Title: Applied Physics B-Lasers and Optics
Volume: 117
Publisher: Springer Berlin Heidelberg
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
Zentrale Einrichtungen
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Date Deposited: 17 Dec 2014 13:02
Official URL: http://link.springer.com/article/10.1007%2Fs00340-014-5803-4
Identification Number: doi:10.1007/s00340-014-5803-4
Funders: The authors kindly acknowledge financial support by the Deutsche Forschungsgemeinschaft DFG (DR 374/9-1 and AL 536/10-1), the Cluster of Excellence EXC 259 Center of Smart Interfaces and the Excellence Initiative, , Darmstadt Graduate School of Excellence Energy Science and Engineering (GSC 1070). , Mr. Pareja gratefully acknowledges Universidad Nacional de Colombia-Sede Medellín (Programa Beca Estudiante Sobresaliente de Posgrado 2011–2012), Alcaldía de Medellín (Programa Enlaza Mundos 2012),, and the Institute Reaktive Strömungen und Messtechnik for their financial support of his research stay at TU Darmstadt.
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