The Science & Technology
of Glass
Cambridge - Monday 4th to
Wednesday 6th September 2017

Fouad El-Diasty

article posted 02 August 2017

Glass parameters affecting radiative lifetime for electronic transitions of luminescent dopants
Fouad El-Diasty1 & Manal Abdel-Baki2

Spectroscopic properties for P2O5(0.55-x)-MgO(0.45)–xBi2O3 glass system were studied, where the range of molar fraction was 0 ≤ x ≤ 0.07 mol%. Glass series were prepared by melt quenching technique to be used as a host glass for upconversion applications. Both density and molar volume were determined. The structural changes have been studied by FT-IR spectroscopy. The adding up of Bi2O3 decreases the P—O—P covalent bond by forming P—O—Bi bonds which were associated with a conversion from Bi3+ into Bi6+ ions. The calculated optical dielectric constant was increased with increasing bismuth oxide contents due to the high polarizing power of Bi3+ and Bi6+ ions and their small field strength. The factors that affect the radiative lifetime of electronic transitions for luminescent dopant ions impeded in the host glasses were studied as well.


1Physics department, Faculty of Science, Ain Shams University, Abbasia, 11566 Cairo, Egypt
2Glass Department, National Research Centre, Dokki 12311 Giza, Egypt