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Up-conversion fluorescence dynamics in Er3+/Yb3+ co-doped tellurite glasses

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Cherif A. , Kanoun A. , Maaref H.

Optica Applicata

2011

tom Vol. 41, nr 1

235--245

The infrared to visible conversion in zinc tellurite glasses (TZG), activated by Er3+ ions and sensitized by Yb3+ ions, has been investigated under 980 nm pulsed laser excitation. The up-conversion mechanism was studied by means of time-resolved luminescence spectroscopy. A model for the dynamics of frequency up-conversion in Er3+/Yb3+ co-doped TZG based on the rate equations was proposed. The dynamics of the up-converted emissions were studied to evaluate energy rates between Er3+ and the Yb3+ ions, and the rate excited state absorption (ESA) in Er3+ ions.

Red up-conversion dynamics in Er3+-doped TeO2-ZnO glasses

100%

Cherif A. , Kanoun A. , Jaba N.

tom Vol. 40, nr 1

109--118

Red fluorescence has been obtained under 980 nm excitation in Er3+-doped TeO2-ZnO glasses. The dynamics of the red up-conversion is well explained with the proposed model. The energy transfer processes are predominant.