Blue luminescence from Ba0.05Zn0.95O nanostructure

Blue luminescence has been realized from ternary alloy compound of Ba0.05Zn0.95O nanostructure. Ba0.05Zn0.95O nanostructure was synthesized by sol-gel spin coating method on a glass substrate. The deposited samples were characterized by X-ray diffractometer (XRD), UV-visible spectrophotometer, field emission scanning electron microscopy (FESEM) and photoluminescence (PL). XRD pattern of Ba0.05Zn0.95O nanostructure film reveals polycrystalline nature with hexagonal wurtzite structure. FESEM-EDAX analysis shows that Ba was successfully incorporated into ZnO with uniform granular nanostructure having average grain size of 30 nm. Analysis of transmission, band gap and thickness have been carried out to investigate effect of post annealing temperature. All the deposited samples exhibit more than 95 % transparency in the visible region. It was observed that the average transmission of the deposited films gradually increase with increasing annealing temperature. Thickness of the synthesized samples were found to be decrease with an increase in post annealing temperature. Optical band gap energy was found to be increased from 3.182 to 3.28 eV with increasing annealing temperature. The dominant peak at 467 nm corresponding to the intense blue emission in the visible range was observed in the PL spectra.