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Temperature Dependent Fluorescence of Nanocrystalline Ce-doped Garnets For Use as Thermographic Phosphors

Published online by Cambridge University Press:  01 February 2011

Rachael Hansel ,
Steve Allison  and
Greg Walker
Rachael Hansel
Affiliation:
[email protected], Vanderbilt University, Interdisciplinary Graduate Program in Materials Science, VU Station B 351592, 2301 Vanderbilt Place, Nashville, TN 37235-1592, Nashville, TN, 37212, United States, 423-645-3652
Steve Allison
Affiliation:
[email protected], Oak Ridge National Laboratory, Oak Ridge, TN, 37831-6054, United States
Greg Walker
Affiliation:
[email protected], Vanderbilt University, Department of Mechanical Engineering, Nashville, TN, 37212, United States
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Abstract

Four samples of (Y1−xCex)3(Al1−y Gay)5O12 (where x=0.01, 0.02 and y=0, 0.5) were synthesized via the simple, efficient combustion synthesis method in order to determine the effect of substituting Ga3+ for Al3+ on the temperature-dependent fluorescent lifetime. X-ray diffraction shows that the Ga-doped samples have longer lattice constants and transmission electron microscopy data show that each sample consists of nanocrystallites which have agglomerated in micron-sized particles. Photoluminescence data reveal that the addition of gallium into the YAG:Ce matrix induces a red shift in the absorption spectra and a blue-shift in the emission spectra. The laser-induced fluorescent lifetime was determined as a function of temperature over the range of 0-125°C using two different emission filters. Increasing the amount of dopant ultimately results in a decrease of the fluorescent lifetime. The quenching temperatures for the Ga-doped samples were lower than the samples without gallium. The results of this work show that combustion synthesis is viable method for making highly luminescent, nanocrystalline TGPs. In addition, these results show that the quenching temperature of YAG:Ce can be altered by substituting ions which alter the location of the charge transfer state and by changing the morphology of the sample.

Keywords

crystallinesensordopant
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1076: Symposium K – Materials and Devices for Laser Remote Sensing and Optical Communication , 2008 , 1076-K06-06
Copyright
Copyright © Materials Research Society 2008

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