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Proceedings Paper

Optical properties of LiAl5O8:Fe3+ film prepared by the sol-gel method
Author(s): T. Ishihara; Katsuhisa Tanaka; Kazuyuki Hirao; Naohiro Soga
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Paper Abstract

LiAl5O8:Fe3+ film has been prepared by using the sol-gel method, and the optical properties of the film have been examined. X-ray diffraction analysis indicates that (110)-oriented LiAl5O8 film is formed when the gel film is heat-treated at 773 K. The x-ray diffraction patterns of the LiAl5O8 films heat-treated above 1173 K manifest diffraction lines assigned to reflections from the (110), (220) and (440) planes. In contrast, only the diffraction lines corresponding to the (220) and (440) planes are observed in the LiAl5O8 film heat-treated below 1073 K. These results suggest that the LiAl5O8 films heat-treated below 1073 K and above 1173 K possess disordered and ordered structures, respectively. The emission spectra of the LiAl5O8 films obtained by the heat treatment above 1173 K manifest a zero-phonon line at around 660 nm with vibronic sidebands in the long wavelength region. These emission bands are ascribed to the transition from 4T1(4G) to 6A1(6S) of Fe3+ in tetrahedral site in the ordered phase. The LiAl5O8:Fe3+ films obtained by the heat treatment below 1173 K, which contain microcrystals of less than 10 nm, are optically transparent.

Paper Details

Date Published: 13 October 1994
PDF: 10 pages
Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); doi: 10.1117/12.189003
Show Author Affiliations
T. Ishihara, Hyogo Prefectural Institute of Industrial Research (Japan)
Katsuhisa Tanaka, Kyoto Univ. (Japan)
Kazuyuki Hirao, Kyoto Univ. (Japan)
Naohiro Soga, Kyoto Univ. (Japan)

Published in SPIE Proceedings Vol. 2288:
Sol-Gel Optics III
John D. Mackenzie, Editor(s)

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