Influence of Fe doping on nanostructures and photoluminescence of sol–gel derived ZnO

Synthesis, Optical and Electrical Properties of ZnFe2O4 Nanocomposites

“…The first is the blue band at 367nm and the second is the orange-red band at 645nm. The blue emission at 376nm is attributed to the defect-related emission, particularly interstitial zinc defects [18]. For the ZnFe2O4 nanocomposite samples, a second emission band in the yellow-orange region centred at about 647nm is observed, which is significantly contributed to by the Fe-Zn phase [19].…”

Modification at Lattice Scale for an Optimized Optical Response of Al<sub>x</sub>(ZnO)<sub>1-x</sub> Nanostructures

“…Photoluminescence spectra of all the four samples of AZO recoded at an excitation wavelength of 320 nm are shown in Figure 5b. Four bands [2] were seen in all spectra and these have assigned as follows: 1) 377 nm (3.29 eV): excitonic emission due to the recombination of excited electron with a hole to form a pair of exciton in the valence band, 2) 425 nm (2.91 eV): transition between conduction band (CB) and zinc vacancy (V zn ), 3) 455 nm (2.72 eV): A transition between exciton level (E) and interstitial oxygen (Oi) and 4) 525 nm (2.36 eV): a transition between V o Zn i and valence band. V o represents oxygen vacancies.…”

“…Oxide nanostructures of ZnO [1][2][3], WO 3 [4] and TiO 2 [5] are of great interest due to their tunable microstructure, phase transformation capability and quantum confinement, required for multifunctional usage. Of the lot, ZnO is an n-type wide band gap semiconductor (E g ~ 3.3 eV) with a wurtzite hexagonal-crystal structure with excellent chemical and thermal stability, large exciton binding energy (60 meV), large electron mass ~ 0.3 m e (m e : Bare electron mass) and a large exciton emissivity at room temperature.…”

“…Of the lot, ZnO is an n-type wide band gap semiconductor (E g ~ 3.3 eV) with a wurtzite hexagonal-crystal structure with excellent chemical and thermal stability, large exciton binding energy (60 meV), large electron mass ~ 0.3 m e (m e : Bare electron mass) and a large exciton emissivity at room temperature. Doping of ZnO by transition metal ions such as Mn 2+ [6], Co 2+ [7], Ni 2+ [8], V 3+ [9] and Fe 3+ [2] yields materials suitable for various optical and electromagnetic applications. Moreover various emission characteristics and shifting of luminescence bands have been attributed to the fine nanocrystalline structures leading to a large surface area and defects [10][11][12].…”

Prospects of Emerging Engineered oxide nanomaterials and their Applications

“…Indeed, MON has emerged as a new generation of building block materials which is beyond the conventional chemicals and expedite broad applications of the materials to modern optoelectronics and biomedical engineering, which generates the possibility of constructing nanoscale electric, optoelectronic devices and biological nanoprobes. Additionally, electrical conduction behaviour of semiconducting MON and excellent proton conductivity of insulating MON commonly changes at different oxygen partial pressure environments and by their dissociation of protons, making them promising component materials for a wide range of ecofriendly applications, including sensors, nanoenergy storage and conversion, optical displays, fuel cells and solar cells [51][52][53][54][55][56][57][58][59][60][61][62] . Moreover, various relevant existing and potential applications for MON systems make them highly attractive to researchers in worldwide.…”