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- W2000245778 abstract "Cathodoluminescence spectra have been measured to determine the characteristics of ubiquitous green luminescence (GL) in nonstoichiometric zinc oxide (ZnO). Zn- and O-rich ZnO were found to exhibit characteristic emissions at 2.53 eV [full width at half-maximum (FWHM) 340 meV] and 2.30 eV (FWHM 450 meV), respectively. Hydrogen was used to probe the physical nature of GL centers. The Zn-rich GL is enhanced upon H incorporation, whereas the O-rich GL is completely quenched as its underlying acceptor-like ${V}_{mathrm{Zn}}$ centers are passivated by H. The GL emission bands each exhibit remarkably different excitation-power dependencies. The Zn-rich GL follows a close to linear relationship with excitation power, while the O-rich GL exhibits a square-root dependence. Calculations based on bimolecular recombination equations show the defect concentration in Zn-rich ZnO is three orders of magnitude greater than that in O-rich ZnO, indicating ${V}_{mathrm{O}}$ is more readily formed than ${V}_{mathrm{Zn}}$ in thermochemical treatments of ZnO." @default.
- W2000245778 created "2016-06-24" @default.
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- W2000245778 date "2012-09-10" @default.
- W2000245778 modified "2023-09-25" @default.
- W2000245778 title "Characteristics of point defects in the green luminescence from Zn- and O-rich ZnO" @default.
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- W2000245778 doi "https://doi.org/10.1103/physrevb.86.115205" @default.
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