The photoluminescence (PL) spectra of the ZnO nanoparticles
and Mg-doped ZnO nanomaterials were illustrated in Fig. 6. All
the samples exhibit the ultraviolet (UV) emission peaks and the
visible emission bands, which consist of four peaks at 490, 505,
526 and 552 nm, respectively. The UV PL peaks are related to the
near band-edge (NBE) emission [17]. The UV peak is shifted
towards shorter wavelength side (blue shift) from 385 nm to
372 nm with the increase of the Mg dopant content from 0 to
5.01%, because of the modulation of the band gap caused by
Mg2+ substituting at the Zn2+ sites in Zn1xMgxO nanomaterials.
The energetic electrons after excitation in Mg ions are able to
transfer from Mg to the conduction band of ZnO. At that instant
the transferred electrons relax extremely fast and rapidly recombine
with holes in the valence band. Therefore, it is possible to
greatly enhance the energy bandgap of ZnO through the substitution
of Mg into ZnO [27]. The relative intensity for the UV PL peaks
in the present samples is obviously higher than that in Zn1xMgxO
nanomaterials by sol–gel method [14], implying that the higher
crystal quality of Zn1xMgxO nanomaterials has been produced
by chemical vapor deposition. From Fig. 6, it will be found that
the four peaks at 490, 505, 526 and 552 nm in Zn1xMgxO nanomaterials
remain unchanged with the increase of Mg dopant content
from 0 to 5.01%, showing that they are not affected by Mg dopants.
The visible emission peaks at 490 and 505 nm are ascribed to the
The photoluminescence (PL) spectra of the ZnO nanoparticles
and Mg-doped ZnO nanomaterials were illustrated in Fig. 6. All
the samples exhibit the ultraviolet (UV) emission peaks and the
visible emission bands, which consist of four peaks at 490, 505,
526 and 552 nm, respectively. The UV PL peaks are related to the
near band-edge (NBE) emission [17]. The UV peak is shifted
towards shorter wavelength side (blue shift) from 385 nm to
372 nm with the increase of the Mg dopant content from 0 to
5.01%, because of the modulation of the band gap caused by
Mg2+ substituting at the Zn2+ sites in Zn1xMgxO nanomaterials.
The energetic electrons after excitation in Mg ions are able to
transfer from Mg to the conduction band of ZnO. At that instant
the transferred electrons relax extremely fast and rapidly recombine
with holes in the valence band. Therefore, it is possible to
greatly enhance the energy bandgap of ZnO through the substitution
of Mg into ZnO [27]. The relative intensity for the UV PL peaks
in the present samples is obviously higher than that in Zn1xMgxO
nanomaterials by sol–gel method [14], implying that the higher
crystal quality of Zn1xMgxO nanomaterials has been produced
by chemical vapor deposition. From Fig. 6, it will be found that
the four peaks at 490, 505, 526 and 552 nm in Zn1xMgxO nanomaterials
remain unchanged with the increase of Mg dopant content
from 0 to 5.01%, showing that they are not affected by Mg dopants.
The visible emission peaks at 490 and 505 nm are ascribed to the
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