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• W2073083321 abstract "The origin of the luminescence from ${mathrm{Ga}}_{2}{mathrm{O}}_{3}$ microcrystallites and nanostructures has been studied using time-resolved x-ray excited optical luminescence and x-ray absorption near-edge structure spectra in total electron yield and photoluminescence yield. The ${mathrm{Ga}}_{2}{mathrm{O}}_{3}$ nanostructures exhibit a crystalline $ensuremath{beta}text{ensuremath{-}}{mathrm{Ga}}_{2}{mathrm{O}}_{3}$ core and an amorphous oxide shell, an ultraviolet (UV) and a red emission with a shorter lifetime and a blue and a yellow emission with a longer lifetime when they are excited by x-ray. We suggest that the UV and red emissions from the ${mathrm{Ga}}_{2}{mathrm{O}}_{3}$ nanostructures are from the amorphous shell, while the blue and yellow emissions are from the crystalline $ensuremath{beta}text{ensuremath{-}}{mathrm{Ga}}_{2}{mathrm{O}}_{3}$ core; that the UV and red emissions are due to the presence of a subband of the amorphous ${mathrm{Ga}}_{2}{mathrm{O}}_{3}$, in the band gap. Our suggestion is in contrast to the previously proposed model, in which the UV emission from ${mathrm{Ga}}_{2}{mathrm{O}}_{3}$ is attributed to an intrinsic transition of crystalline $ensuremath{beta}text{ensuremath{-}}{mathrm{Ga}}_{2}{mathrm{O}}_{3}$. The implications of these observations are discussed." @default.
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• W2073083321 date "2007-03-02" @default.
• W2073083321 modified "2023-10-16" @default.
• W2073083321 title "Origin of luminescence from<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi mathvariant=normal>Ga</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>nanostructures studied using x-ray absorption and luminescence spectroscopy" @default.
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• W2073083321 doi "https://doi.org/10.1103/physrevb.75.125303" @default.
• W2073083321 hasPublicationYear "2007" @default.
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