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• W2892695021 abstract "We have found a photoluminescence (PL) band with unusual properties in GaN. The blue band, termed as the ${mathrm{BL}}_{C}$ band, has a maximum at about 2.9 eV and an extremely short lifetime (shorter than 1 ns for a free-electron concentration of about ${10}^{18}phantom{rule{0.16em}{0ex}}mathrm{c}{mathrm{m}}^{ensuremath{-}3}$). The electron- and hole-capture coefficients for this defect-related band are estimated as ${10}^{ensuremath{-}9}$ and ${10}^{ensuremath{-}10}phantom{rule{0.16em}{0ex}}mathrm{c}{mathrm{m}}^{3}/mathrm{s}$, respectively. The ${mathrm{BL}}_{C}$ band is observed only in GaN samples with relatively high concentration of carbon impurity, where the yellow luminescence (the YL1 band) with a maximum at 2.2 eV is the dominant defect-related PL. Both the YL1 and ${mathrm{BL}}_{C}$ bands likely originate from the ${mathrm{C}}_{mathrm{N}}$ defect, namely, from electron transitions via the $ensuremath{-}/0$ and $0/+$ thermodynamic transition levels of the ${mathrm{C}}_{mathrm{N}}$. The ${mathrm{BL}}_{C}$ band appears only at high excitation intensities in $n$-type GaN samples codoped with Si and C, and it can be found in a wide range of excitation intensities in semi-insulating (presumably $p$-type) GaN samples doped with C. The properties and behavior of the YL1 and ${mathrm{BL}}_{C}$ bands can be explained using phenomenological models and first-principles calculations." @default.
• W2892695021 created "2018-10-05" @default.
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• W2892695021 date "2018-09-28" @default.
• W2892695021 modified "2023-10-02" @default.
• W2892695021 title "Two charge states of the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi mathvariant=normal>C</mml:mi><mml:mi mathvariant=normal>N</mml:mi></mml:msub></mml:math> acceptor in GaN: Evidence from photoluminescence" @default.
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• W2892695021 doi "https://doi.org/10.1103/physrevb.98.125207" @default.
• W2892695021 hasPublicationYear "2018" @default.
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