Optical properties of LiAl5O8:Fe3+ film prepared by the sol-gel method

T. Ishihara; Katsuhisa Tanaka; Kazuyuki Hirao; Naohiro Soga

doi:10.1117/12.189003

13 October 1994 Optical properties of LiAl₅O₈:Fe³⁺film prepared by the sol-gel method

T. Ishihara, Katsuhisa Tanaka, Kazuyuki Hirao, Naohiro Soga

Proceedings Volume 2288, Sol-Gel Optics III; (1994) https://doi.org/10.1117/12.189003
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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.

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T. Ishihara, Katsuhisa Tanaka, Kazuyuki Hirao, and Naohiro Soga "Optical properties of LiAl₅O₈:Fe³⁺film prepared by the sol-gel method", Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); https://doi.org/10.1117/12.189003

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KEYWORDS

Heat treatments

Diffraction

Ions

Crystals

Glasses

Optical properties

Ceramics

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