Abstract:Cobalt doped zinc oxide nanorods Zn1−xCoxO (x = 0.01, 0.10) have been synthesized by a hydrothermal process with Zn(NO3)2, Co(NO3)2, NH4OH, CO(NH2)2 and C2H5OH at 150 °C for 1 h. X-ray diffraction and scanning electron microscopy were used to characterize the crystalline structure, size and morphology of the samples. The photoluminescence (PL) and the PL excitation spectra of the nanorods were measured in the range of temperature from 15 K to room temperature. The PL spectra at low temperatures exhibit a group… Show more
“…The broadened peak near 3.2 eV represents the donor-acceptor pair transitions of the Co-O and Zn-O pairs. The PL results agree well with previous studies of polished ZnO films [35], Co-added ZnO nanorods [36], and nitrogen-implanted ZnO nanorods [37].…”
“…The broadened peak near 3.2 eV represents the donor-acceptor pair transitions of the Co-O and Zn-O pairs. The PL results agree well with previous studies of polished ZnO films [35], Co-added ZnO nanorods [36], and nitrogen-implanted ZnO nanorods [37].…”
“…This band appears 0.13 eV red shifted with respect to the reported NIR bands mentioned above and with a slightly larger bandwidth. A similar broadband emission was observed by Müller et al [14] and Loan et al [15] in ZnO:Co nanowires and nanorods. Their results revealed the band shape is strongly dependent on the cobalt concentration and do not show any trace of narrow peak structure, i.e., zero-phonon line for cobalt concentrations higher than 4%, even at 19 K. The authors have attributed this broadband to phonon side-band of the 2 E(G) ?…”
“…S3 with x ¼0.1% has a broad peak with the center at the wavelength of about 478 nm. S4 with x ¼0.3% has the same feature which has been superposed with the fundamental absorption edge that has also been confirmed by Loan et al [45]. It can be deduced that cobalt insertion enhances ZnO crystal growth as well as structural defects.…”
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