Optical Properties of Li2B4O7 Glasses Doped with Rare-Earths and Transition Metal Ions
Abstract
Absorption and emission spectra of Cr, Eu and Dy ions in Li2B4O7 glasses melted in oxygen and hydrogen were measured for valency states and excited states analysis. It was stated that the presence of Cr(6+) ion is limited by composition of the starting mixture and atmosphere of the melting and that this ion arises as Cr(6+)O4 complex. The 308 nm line excites the Li2B4O7:Cr glass within the highest absorption peak which can be ascribed to the following charge transfer transition: Cr(6+)O4(3d(sup 0)2p(sup 6)) right arrow Cr(5+)O(-)(3d(sup 1)2p(sup 5)). Under gamma irradiation Cr(6+)O4 complex of 3d(sup 0) configuration can be disintegrated giving additional absorption bands of Cr(3+) and may be Cr(4+) centers at tetrahedral sites One of these additional absorption bands is responsible for 430 nm emission.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2001
- Accession Number
- ADP011934
Entities
People
- A. Majchrowski
- Cz. Koepke
- K. Wisniewski
- M. Grinberg
- S. M. Kaczmarek
Organizations
- Military University of Technology