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CL spectra of codoped ZnO samples at room temperature.
CL spectra of ZnO codoped with Al and Li, ZnO:Zn and ZnO:Cu measured at low temperature. Dotted lines indicate the result of peak fitting assuming Gaussian broadening.
(Color) Temperature dependence of CL spectra: (a) doped only with Li and (b) codoped with Ga and Li.
PLE spectra of ZnO:Zn and ZnO codoped with Ga and Li measured at RT.
Electron concentration in codoped ZnO, , at room temperature.
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