Preparation and Characterization of Chromium(III)-Activated Yttrium Aluminum Borate: A New Thermographic Phosphor for Optical Sensing and Imaging at Ambient Temperatures.
A new thermographic phosphor based on chromium(III)-doped yttrium aluminum borate (YAB) is obtained as single crystals by high temperature flux growth and as a microcrystalline powder via solution combustion synthesis. The phosphor is excitable both in the blue (lambda(max) 422 nm) and in the red part of the spectrum (lambda(max) 600 nm) and shows bright NIR emission. The brightness of the phosphor is comparable to that of a well-known lamp phosphor Mn(IV)-doped magnesium fluorogermanate. At ambient temperatures, the Cr(III)-doped YAB shows high temperature dependence of the luminescence decay time, which approaches 1% per deg. The material shows no decrease in luminescence intensity at higher temperatures. The new phosphor is particularly promising for applications in temperature-compensated optical chemosensors (including those based on NIR-emitting indicators) and in pressure-sensitive paints.
Borisov
Sergey M
SM
Institute of Analytical Chemistry and Food Chemistry, Graz University of Technology, Stremayrgasse 16, A-8010, Graz, Austria, and Institute of Physical and Theoretical Chemistry, Graz University of Technology, Rechbauerstrasse 12, A-8010, Graz, Austria.
Gatterer
Karl
K
Bitschnau
Brigitte
B
Klimant
Ingo
I
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