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A Review and New Design Options to Minimize the Capital and Operational Cost of Single Effect Solar Absorption Cooling System for Residential Use Read chapter Read first chapter

2012 | OriginalPaper | Chapter

Optical Band Gap Studies on Dy3+ Doped Boro-Tellurite Glasses

Authors : K. Maheshvaran, K. Marimuthu

Published in: Emerging Trends in Science, Engineering and Technology

Publisher: Springer India

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Abstract

The Dy3+ doped boro-tellurite glasses were prepared following conventional melt quenching technique with the chemical composition (69–x) H3BO3 + xTeO2 + 15Mg2CO3 +15K2CO3 + 1Dy2O3 (where x = 0, 10, 20, 30 and 40 wt%). The optical absorption spectra have been recorded at room temperature to explore the optical properties. The optical band gap energy has been calculated using Davis and Mott theory through direct allowed, indirect allowed, and indirect forbidden transitions. Through the optical absorption spectra, optical band gap (E opt), band tailing parameter (B), and Urbach energy (ΔE) were calculated for all the prepared glasses and the results were reported. It is observed from the results that the band gap energy value decreases, whereas Urbach’s energy increases with the increase in TeO2 content.

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Metadata
Title
Optical Band Gap Studies on Dy3+ Doped Boro-Tellurite Glasses
Authors
K. Maheshvaran
K. Marimuthu
Copyright Year
2012
Publisher
Springer India
Book
Emerging Trends in Science, Engineering and Technology

Print ISBN: 978-81-322-1006-1

Electronic ISBN: 978-81-322-1007-8

Copyright Year: 2012

DOI
https://doi.org/10.1007/978-81-322-1007-8_54

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