کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1516109 | 1511546 | 2013 | 4 صفحه PDF | دانلود رایگان |

• The substitution of Cu and Mn induces a shift in the top of the valence band.
• Visible region emission of ZnO indicates transition between defect and valence band.
• UV radiation is attributed to transition from conduction band to valence band.
ZnO and Mn- or Cu-doped ZnO ceramics have been investigated using photoluminescence (PL) spectra and through X-ray photoelectron spectroscopy (XPS). The PL spectra show that the band gap is approximately 3.19 eV, 3.17 eV, and 3.01 eV for ZnO, Zn0.925Mn0.075O, and Zn0.99Cu0.01O ceramic, respectively. The XPS experimental results reveal that the Cu ion is Cu2+ and the Mn ion is Mn3+ in these ceramics. A broad impurity (defect) band has been observed in the band gap; its maximum intensity is at approximately 0.83 eV, 0.30 eV, and −0.02 eV for ZnO, Zn0.99Cu0.01O, and Zn0.925Mn0.075O, respectively. Moreover, the substitution of Cu and Mn for zinc ions induces a shift in the top of the valence band. Based on this experiment study, we conclude that the visible PL radiation of ZnO originates from the transition between the impurity (defect) band and the valence band, and that ultraviolet emission results from the transition between the conduction band and the valence band.
Journal: Journal of Physics and Chemistry of Solids - Volume 74, Issue 8, August 2013, Pages 1127–1130