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- W2022693971 abstract "The donor and acceptor charge-transfer transitions in YAl${mathrm{O}}_{3}$:${mathrm{Ti}}^{3+}$/${mathrm{Ti}}^{4+}$ were investigated through absorption, emission, excitation, one-photon and two-photon photoconductivities, excited-state absorption, and thermoluminescence. The results are contrasted to similar studies previously made on ${mathrm{Al}}_{2}$${mathrm{O}}_{3}$:${mathrm{Ti}}^{3+}$/${mathrm{Ti}}^{4+}$. The dominant ${mathrm{Ti}}^{3+}$ population has a photoionization threshold at 37 000 ${mathrm{cm}}^{ensuremath{-}1}$. The lowest energy ${mathrm{Ti}}^{4+}$ charge-transfer transition has its zero-phonon energy near to 33 900 ${mathrm{cm}}^{ensuremath{-}1}$. The sum of these two quantities agrees with the reported band-gap energy of YAl${mathrm{O}}_{3}$. The position of the ${mathrm{Ti}}^{3+}$/${mathrm{Ti}}^{4+}$ level in the band gap of YAl${mathrm{O}}_{3}$ is determined by these measurements. Stimulated emission from the $^{2}E$ state of ${mathrm{Ti}}^{3+}$ is limited by photoionization from this state." @default.
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- W2022693971 date "1996-09-01" @default.
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- W2022693971 title "Optical and photoelectrical studies of charge-transfer processes in YAl<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>:Ti crystals" @default.
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- W2022693971 doi "https://doi.org/10.1103/physrevb.54.6141" @default.
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