# Optical absorption and emission properties of $Pr^{3+}$ and $Er^{3+}$ in lithium cesium mixed alkali borate glasses

Ratnakaram, YC and kumar, Vijaya A and Chakradhar, RPS (2006) Optical absorption and emission properties of $Pr^{3+}$ and $Er^{3+}$ in lithium cesium mixed alkali borate glasses. In: Journal of Luminescence, 118 (2). pp. 227-237.

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## Abstract

This article presents the optical absorption and emission properties of $Pr^{3+}$ and $Er^{3+}$ in mixed alkali borate glasses of the type $68B_2O_3{\cdot}xLi_2O{\cdot}(32-x)Cs_2O$ (where x=8, 12, 16, 20 and 24). The variation of Judd–Ofelt intensity parameters $(\Omega_{\lambda})$, the peak wavelength of the hypersensitive transitions, radiative transition probabilities $(A_{rad})$ and peak emission cross-sections $({\sigma}_p)$ with x in the glass matrix have been discussed in detail. The changes in position of hypersensitive transition and intensity parameters with x are correlated to the structural changes in the host matrix. The estimated radiative lifetimes $(\tau_R)$ of certain excited states of both $Pr^{3+}$ and $Er^{3+}$ in lithium cesium mixed alkali borate glasses are reported. Branching ratios $(\beta)$ and integrated absorption cross-sections $(\Sigma)$ for certain important transitions are presented. Peak stimulated emission cross-sections $(\sigma_p)$ are calculated for the observed emission peaks of $Pr^{3+}$ and $Er^{3+}$ ions in this glass matrix.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Rare earths;Absorption;Emission;Lifetime;Cross section Division of Physical & Mathematical Sciences > Physics 10 Oct 2006 19 Sep 2010 04:32 http://eprints.iisc.ernet.in/id/eprint/8824