Role of micro-strain and defects on band-gap, fluorescence in near white light emitting Sr doped ZnO nanorods

Abstract

We report tunable band gap (red shift in band gap) of ZnO driven by the Sr doping. It is observed that enhanced white light like luminescence from Sr doped ZnO nanorods. Raman studies have carried out to get insight of phonon related vibrational properties. Dopant induced local vibrational mode appeared after Sr incorporation has been identified from Raman studies. Photoluminescence studies show that doped ZnO nanorods fluorescence covers the entire visible region apart from the characteristic exciton related UV luminescence. Crystallite size variation, defects formation, and relaxation of micro strain after doping shows a strong dependence on the luminescence of the prepared samples. The increase in luminescence with increasing dopant concentration is attributed to doping induced changes in crystallinity, micro strain, and defects formation in the samples.

Hydrothermal synthesis of strontium-doped ZnS nanoparticles: structural, electronic and photocatalytic investigations

“…where h, k and l are Miller indices of the Bragg planes. From the XRD patterns, a slight shift in the peak positions is observed for the Sr-doped samples compared to the undoped-ZnS NPs, denoting a weak change in the lattice parameters (5.27-5.30 Å) due to the incorporation of larger Sr 2+ replacing Zn 2+ in the ZnS lattice [36][37][38].…”

Correlation between Structural Evolution and Device Performance of CH3NH3PbI3 Solar Cells under Proton Irradiation

“…The corresponding absorption cutoff wavelengths also decreased with the increase in irradiation fluence, indicating that the absorption capacity of visible light spectrum was weakened. The slight increase in the bandgap was caused by defects and lattice microstrains induced by irradiation . In the process of proton irradiation, the atoms (such as C and H atoms) in MAPbI 3 departed from their pristine positions due to cascade collisions, forming holes and interstitial atoms, which induced compressive and tensile microstrains, respectively.…”

“…The slight increase in the bandgap was caused by defects and lattice microstrains induced by irradiation. 39 In the process of proton irradiation, the atoms (such as C and H atoms) in MAPbI 3 departed from their pristine positions due to cascade collisions, forming holes and interstitial atoms, which induced compressive and tensile microstrains, respectively. In addition, a large number of protons staying in the MAPbI 3 lattice could also cause tensile microstrain.…”

Hazardous o-toluidine mineralization by photocatalytic bismuth doped ZnO slurries

“…Zinc oxide has been introduced in heterogeneous photocatalytic treatments as an alternative material to TiO 2 , thanks to its similar properties: high photosensitivity, nontoxicity, low cost, competitive photocatalytic activity. In particular, ZnO presents a band gap of 3.37 eV, with a red shift down to 3.2 eV due to agglomeration of nanocrystallites into larger ones 6,7 . Recently, along with their traditional application fields (e.g.…”

“…In particular, ZnO presents a band gap of 3.37 eV, with a red shift down to 3.2 eV due to the agglomeration of nanocrystallites into larger ones. 6,7 Recently, along with their traditional application fields (e.g. coatings and cosmetics), ZnO nanopowders have been used as photocatalysts (next to TiO 2 ) for environmental remediation both in aqueous and gas phases.…”