I. Morgenstern, K.A. Müller, et al.
Physica B: Physics of Condensed Matter
Nominally undoped YAlO3 shows broad intense absorption bands in the visible after irradiation with visible and near uv light at 77 K; they become especially strong after subsequent irradiation with near ir. The bands could be correlated with an ESR spectrum arising from holes, which are trapped at O2- ions near unidentified defects or are possibly self-trapped. A similar spectrum appeared after heating to 200 K. It was rather weak and a corresponding absorption could not definitely be identified. The optical absorption is explained by treating the holes together with their accompanying lattice distortions as small polarons. A theory based on this model is presented which is a generalization of an earlier treatment of bound-small-polaron absorption. Information on further absorption of the crystals up to 4 eV is given. Most of this absorption is related to the formation or quenching of the polaron bands. © 1975 The American Physical Society.
I. Morgenstern, K.A. Müller, et al.
Physica B: Physics of Condensed Matter
Frank R. Libsch, Takatoshi Tsujimura
Active Matrix Liquid Crystal Displays Technology and Applications 1997
Heinz Schmid, Hans Biebuyck, et al.
Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
Peter J. Price
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