Luminescence investigation of visible light emitting Ho3+ doped tellurite glass

Dual mode (upconversion and downshifting) emissions from the holmium activated TeO2-ZnO glass is the focus point of the present study. The glasses were prepared by the well-known melt quenching technique and identified by X-ray diffraction analysis. The thermal stability and glass transition characteristics were detailed on the basis of differential thermal analysis. The luminescence behaviour of the prepared glasses was explained on the basis of optical absorption and emission spectra recorded at different excitations. Intense green and yellowish-green emissions were detected upon excitations with blue and near-infrared wavelength photons, respectively. The upconversion process and colour tuning emission properties were discussed in detail with the help of a power dependence study, energy level diagram and CIE calculations.