Das Mohapatra, G K (1998) A spectroscopic study of Ce3+ ion in calcium metaphosphate glass. Physics and Chemistry of Glasses, 39 (1). pp. 50-55. ISSN 0031-9090

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Abstract

Absorption, excitation, emission spectra and lifetime measurements of cerium doped calcium metaphosphate glass in the concentration range 3.83x10(18)-6.34x10(20) ions cm(-3) are investigated. The ultraviolet absorption spectra reflects the 4f-->5d transitions where the 5d state is split into five levels due to the cubic crystal field in the glass matrix. The visible absorption is probably due to interconfigurational 4f-->5d transition of Ce3+ ion where two Ce3+ ions are bound via O2- ions making a complex of the type Ce3+-O2--Ce3+. The infrared absorption spectra reflects the intraconfigurational F-2(5/2)-->F-2(7/2) transitions of Ce3+ ion. It is shown that two kinds of fluorescent centres are present. Emission in the ultraviolet region arises from the lowest 5d states of Ce3+ and that at the long wavelength red region and in the infrared are probably from the interconfigurational 4f-->5d states of Ce3+-O2--Ce3+ complex. The 5d electronic states of the complex in turn can be generated through electronic transitions into the 4f(1)5d band of Ce3+. The quantum efficiency for the emission in the ultraviolet region is almost unity and concentration independent.

Item Type:	Article
Uncontrolled Keywords:	Experimental study;Phosphate glass;Quantity ratio; Absorption spectra;Photoluminescence;Luminescence decay ;Calcium phosphates;Cerium additions;Inorganic compounds
Subjects:	Glass
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	10 Jul 2012 11:03
Last Modified:	06 Apr 2016 09:44
URI:	http://cgcri.csircentral.net/id/eprint/1555

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