Influence of Yb/Hocodoping on optical and thermal properties of TeO-ZnO glass.

This paper reports the effect of incorporation of Ybions on the frequency downconversion luminescence and thermal properties of triply ionised Hodoped zinc tellurite (TZ) glasses. The photoluminescence spectra of both the Ho/Ybdoped and codoped glasses have been recorded and observed a green emission band corresponding to theF,S→I(∼550 nm) transition upon various excitations. In the downconversion (DC) emission process, the back energy transfer (BET) mechanism from Hoions to Ybions has also been explored. The colour emitted in the downconversion process is found to be non-tunable at different excitations. Thus, the Ho:TZ glass can be utilised for non-colour tunable optical devices under various UV excitations. Also the glass transition (T) and crystallisation (T) temperatures have been measured for both the doped and codoped glasses and found to be increased in the codoped glass. The singly Hoions doped TZ glass shows better optical downconversion and glass forming ability.