Orange Photoluminescence from Hydrothermally Grown Zno Nanorods and Study on its Defects

462-467The visible photoluminescence (PL) of ZnO is controversial for a long time. At present, the contribution of oxygen interstitial defects to yellow/orange emission from ZnO nanostructures is on debate. In this report, the origin of orange emission from solution- grown ZnO nanorods is investigated using excitation wavelength dependent photoluminescence PL, PL excitation and UV-Vis spectra. These results showed that orange emission may be due to the transition of an electron from shallow defect levels positioned slightly below the conduction band to the singly ionized oxygen vacancies. Hence, it is believed that oxygen interstitials may not be responsible for orange emission from solution grown ZnO nanostructures

Orange Photoluminescence from Hydrothermally Grown Zno Nanorods and Study on its Defects

The visible photoluminescence (PL) of ZnO is controversial for a long time. At present, the contribution of oxygen interstitial defects to yellow/orange emission from ZnO nanostructures is on debate. In this report, the origin of orange emission from solution- grown ZnO nanorods is investigated using excitation wavelength dependent photoluminescence PL, PL excitation and UV-Vis spectra. These results showed that orange emission may be due to the transition of an electron from shallow defect levels positioned slightly below the conduction band to the singly ionized oxygen vacancies. Hence, it is believed that oxygen interstitials may not be responsible for orange emission from solution grown ZnO nanostructures

Enhancing the electrical, optical, and structure morphology using Pr2O3-ZnO nanocomposites: Towards electronic varistors and environmental photocatalytic activity

In this proposed research, the samples of undoped and several concentrations of praseodymium-doped zinc oxide (Pr2O3- ZnO) nanoparticles ranged from 0.001 g to 5 g were synthesized using a combustion technique as a simple, efficient, inexpensive, and environmental method. The structure, morphology, and chemical bonding were investigated by X-ray diffraction (XRD), and scanning electron microscopy (SEM), respectively, of the prepared Pr2O3-ZnO photocatalysts. The attained data from the previous devices sustained the ZnO growth from crystalline to satisfactory nanoparticle structure through changing the Pr3+-doping concentrations inside the host matrix. Furthermore, the optical features have been investigated via UV-Vis diffused reflectance spectroscopy (DR), and AC electrical conductivity was studied to investigate the Pr3+-nanoparticles' influence on the optical characteristics, energy bandgaps, of all proposed Pr2O3-ZnO nanostructured samples. The addition of Pr3+ dopants decreases the energy bandgap slightly and confines the photogenerated electron-hole recombination. The studied Pr2O3-ZnO nano-samples have been applied in photocatalytic degradation of methylene blue (MB) as an example for organic dyes and p-chlorophenol (p-CP) under visible light irradiation. The influence of Pr3+-concentration, H2O2 concentration, and pH of the medium on the photocatalytic reaction have been studied. As the praseodymium doping ratios increased; the photocatalytic efficiency increased. After the addition of moderate Pr3+-doping, further generation of hydroxyl radicals over ZnO. For 1% Pr3+-ZnO, the optimal photocatalyst is a degradation of 100% of p-chlorophenol and methylene blue solutions. The prepared Pr2O3-ZnO nanostructured samples are amazing, promising candidates in novel potential nano-applications for wide-ranged from varistors, wastewater treatments, biomedical and photocatalytic degradation for phenol and organic dyes to different environmental fields