Fundamental absorption edge in bismuth-vanadate glasses

Ghosh, A. (1988) Fundamental absorption edge in bismuth-vanadate glasses Physica Status Solidi A, 110 (2). pp. 651-656. ISSN 0031-8965

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Optical measurements of fundamental absorption edge of bismuth-vanadate glass films containing 70 to 95 mol% V2O5 are made in the wavelength range 200 to 700 nm. The absorption edge in these glasses obeys the relation α (hω - Eopt)2/hω. The optical band gap, (Eopt) is determined to be 2.30 to 2.15 eV, depending on compositions of the glass and is found to decrease with increase of V2O5 content in the glass. The absorption coefficient is found to depend exponentially on the photon energy, which is explained to be due to the exponential distribution of the localized states in the optical gap.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
ID Code:86555
Deposited On:12 Mar 2012 07:26
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