# Electronic spectra of $Pr^3^+$ doped mixed alkali borate glasses.

Ratnakaram, YC and Kumar, Vijaya A and Tirupathinaidu, D and Chakradhar, RPS and Ramakrishna, J (2003) Electronic spectra of $Pr^3^+$ doped mixed alkali borate glasses. In: Physics and Chemistry of Glasses, 44 (5). pp. 376-381.

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## Abstract

An investigation of the optical absorption spectra of 1 mol% $Pr_2O_3$ in mixed alkali borate glasses of the type $xNa_2O.(30-x)K_2O.69B_2O_3.1Pr_2O_3$ (x=5, 10, 15, 20 and 25) is presented. The glasses were obtained by quenching melts consisting of $Na_2CO_3, K_2CO_3, H_3BO_3 and Pr_2O_3$(850-1000 Deg C, 1.5-2 h) between brass plates. Spectroscopic parameters like Racah $(E^1, E^2 and E^3)$ and spin orbit ( \xi 4f) interaction parameters and Judd-Ofelt intensity parameters (\Omega 2,\Omega4 and \Omega 6) have been calculated as a function of x in the glass matrix. Radiative and nonradiative transition rates $(A_T and W_M_P_R)$, radiative lifetimes $( \tau _R)$, branching ratios (\beta) and integrated absorption cross sections (\Sigma) are reported for certain excited states of $Pr^3^+$ in all glasses studied. Variations of these parameters as a function of composition are discussed in terms of covalency and of changes into the crystal field around the $Pr^3^+$ ions caused by structural changes of the glass matrix.

Item Type: Journal Article The copyright for this article belongs to Society of Glass Technology. mixed alkali borate glasses;Electronic spectra;Pr3+ ions;radiative lifetimes;branching ratios;integrated absorption cross sections Division of Physical & Mathematical Sciences > Physics 28 Nov 2005 19 Sep 2010 04:17 http://eprints.iisc.ernet.in/id/eprint/2501