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Student Seminar Announcement for April 18

Apr 11, 2012

*****Seminar Announcement*****

PHYS600 Wednesday, April 18, 4:00-4:50 pm
Currens Hall 205
All physics faculty and students are invited.

Speaker: Atif Alhabbad
Graduate Student, Physics Department, WIU

Title: " Fluorescence of trivalent samarium in bismuth borate glasses"

Abstract:

We studied the effect of host glass composition on the fluorescence properties of trivalent samarium ions in bismuth borate glasses, with Bi2O3 contents varying from 24 mol% to 64 mol %. Bismuth borate glasses containing 0.5 mol% samarium were prepared by the usual melt quench method. Glasses were then annealed near the glass transition temperature (4000 C) for 3 hrs. Fluorescence spectra of all these samples were obtained using two different excitation wavelengths. The intensity of the samarium fluorescence depends on the Bi2O3 content and excitation wavelengths. This could be due to the structural changes occurring in the vicinity of samarium ions with increase in bismuth content as well as the energy transfer from the bismuth ions to samarium ions.

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