Volume : III, Issue : V, May - 2013

Structural and Optical Properties of Sm3+ ions in potassium niobate silicate glasses

M. Murali Mohan, L. Rama Moorthy, C. K. Jayasankar

Abstract :

The trivalent samarium (Sm3+) ions doped with potassium niobate silicate glasses (KNbSiSm) of molar composition 30 K2 O– 25 Nb2 O5   – (44.95– x) SiO2 – xSm2 O3  (where x= 0.05, 0.1, 0.5, 1.0 and 2.0 mol %) were prepared by conventional melt quenching technique. Raman spectrum was recorded to find out the basic structural units present in the title glass. Optical properties were characterized by using various spectroscopic techniques such as absorption, excitation, emission and decay measurements. The Judd– Ofelt intensity parameters (W2, W4 and W6 ) have been derived from absorption spectrum which is in turn used to calculate radiative properties of the excited luminescent levels of Sm3+– ions. The decay times of the 4 G5/2 excited level for different concentration of Sm3+–   ions have been measured. The non– exponential behavior of decay curves has been analyzed through Inokuti–Hirayama model. The characteristic emission and the radiative parameters obtained for the 4 G5/2 → 6 H7/2 transition indicate that the KNbSiSm glass could be very much useful for the development of lasers and photonic device applications in the visible region. Summary: Potassium niobate silicate glasses with different concentrations of Sm3+– ions were prepared and characterized for their structural and optical properties through Raman, absorption, excitation, emission and decay measurements at room temperature. The Raman spectrum revealed the basic structural units related to the presence of Si– O– Si and Nb– O bands which are attributed to NbO6  octahedral with non–idging oxygen’s. Judd– Ofelt(JO) parameters Wλ (λ=2, 4, 6) have been evaluated from the oscillator strengths of absorption bands in UV– Vis/NIR regions. Various radiative parameters like radiative transition probabilities(AR, s–1), peak stimulated emission cross– sections σ e (λp), experimental (bexp) and calculated (bR) anching ratios for the emission transitions of Sm3+ ion in KNbSiSm10 glass. From these results it is suggested that Sm3+–doped potassium niobate silicate glasses are more efficient luminescent materials for the development of lasers and photonic devices in the visible region.

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Article: Download PDF   DOI : 10.36106/ijar  

Cite This Article:

M. Murali Mohan, L. Rama Moorthy, C.K. Jayasankar Structural and Optical Properties of Sm3+ ions in potassium niobate silicate glasses Indian Journal of Applied Research, Vol.III, Issue.V May 2013

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