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Spectrochim Acta A Mol Biomol Spectrosc. 2005 Oct;61(13-14):2827-31. Epub 2004 Dec 25.

Optical transitions of Er3+/Yb3+ codoped TeO2-WO3-Bi2O3 glass.

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Faculty of Information Science and Engineering, Ningbo University, Zhejiang 315211, China.


Optical absorption and emission properties of the Er3+/Yb3+ codoped TeO2-WO3-Bi2O3 (TWB) glass has been investigated. The transition probabilities, excited state lifetimes, and the branching ratios have been predicted for Er3+ based on the Judd-Ofelt theory. The broad 1.5 microm fluorescence was observed under 970 nm excitation, and its full width at half maximum (FWHM) is 77 nm. The emission cross-section is calculated using the McCumber theory, and the peak emission cross-section is 1.03 x 10(-21) cm2 at 1.531 microm. This value is much larger than those of the silicate and phosphate glasses. Efficient green and weak red upconversion luminescence from Er3+ centers in the glass sample was observed at room temperature, and the upconversion excitation processes have been analyzed.

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