Optical absorption, luminescence spectra and upconversion of both red to green and infrared to green luminescence have been studied for a doped zinc tellurite glass of composition From the absorption data, Judd–Ofelt parameters for the ion are calculated along with the radiative transition rates, branching ratios and radiative lifetimes of the major emitting levels. The upconversion luminescence for both 646 and 754 nm excitation was attributed to a two photon excited state absorption upconversion mechanism that occurs via the level. For an excitation power density of an upconversion efficiency of 1.22% was determined for the case of 646 nm excitation, which is considerably higher than what has been reported in doped fluoride single crystals. Under 754 nm excitation, an upconversion efficiency of 0.27% was observed for a excitation power density of which is reasonably low compared to other doped materials.
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Research Article| May 30 2003
Optical transitions and upconversion properties of doped glass
J. C. Boyer;
J. A. Capobianco;
J. C. Boyer, F. Vetrone, J. A. Capobianco, A. Speghini, M. Bettinelli; Optical transitions and upconversion properties of doped glass. J. Appl. Phys. 15 June 2003; 93 (12): 9460–9465. https://doi.org/10.1063/1.1577817
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