Optical properties of oxide magnetic ZnO, Zn0.95Mn0.05O and Cu2O nanopowders

Optical properties of ZnO, Zn0.99Mn0.01O nanopowders

“…The PLE spectrum exhibits intensive peaks due to the transitions to high-energy states of Mn 2+ ion ( 4 T 2 and 4 A 2 , 4 E), whereas in the interband transition region we can see the maximum near the E g and smooth decreasing of intensity at (Fig. 1-b3) and 2.12 eV [6] due to the transitions through the deep states. We can see that the PLE spectrum for Zn 0.99 Mn 0.01 O nanopowders (emission 2.9 eV, Fig.…”

“…In PLE spectra of 2.9 eV peak for as grown (i.e. without the annealing) nanopowder three peaks at the energies of 3.9, 4.5 and 5.3 eV are observed [6]. After the annealing the intensity of these peaks decreases, but the increasing of PLE spectrum with the increasing of the light quantum energy is clearly expressed, especially for the last peak 5.3 eV.…”

“…After the annealing the intensity of these peaks decreases, but the increasing of PLE spectrum with the increasing of the light quantum energy is clearly expressed, especially for the last peak 5.3 eV. Such behavior of PLE spectrum is significantly different in its character from that for the luminescence through the deep levels, when the intensity decreases along with the increasing of the excitation energy in the region g E > ω [6]. For comparison we demonstrate the PL and PLE spectra for Zn 0.995 Mn 0.005 S (Fig.…”

“…The manganese concentration in nanocrystals Zn 1-x Mn x O before and after the annealing was determined by inductively-coupled plasma mass spectroscopy (iCAP 6000, Thermo) and x=0.01. Optical spectra in [6] were observed for nanocrystals Zn 1-x Mn x O with x=0.01 also. Figure 1 presents the PL and PLE-spectra of Zn 0.99 Mn 0.01 O nanopowder before and after annealing.…”

“…However in photoluminescence (PL) spectra of colloidal nanocrystals of Zn 1-x Mn x O the ZR-state is not observed [5]. Recently the PL-peak at the energy of 2,9 eV for Zn 0.99 Mn 0.01 O nanopowder, prepared by the gas phase synthesis method, was detected [6]. In the 2,9 eV photoluminescence excitation (PLE) spectrum were observed three wide peaks in the region of interband transitions at the energies of 3.9, 4.5 and 5.3 eV.…”