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- Title
Luminescence of modified nonbridging oxygen hole centers in silica and alkali silicate glasses.
- Authors
A. Zatsepin; V. Guseva; D. Zatsepin
- Abstract
Abstract  This paper reports on the results of the investigation of the cathodoluminescence spectra of silica and alkali silicate glasses upon excitation with a pulsed electron beam (energy, 180 keV; current density, 700 A/cm2; pulse duration, 2 ns). The luminescence band observed in the energy range 2.4â2.6 eV is assigned to modified structural defects of the â¡Si-O·/Me type. These defects are revealed under high-density electronic excitation and, unlike the known L centers in alkali silicate glasses, are interpreted as a variety of nonbridging oxygen hole centers (defects of the dangling bond type) subjected to a disturbing action of the nearest neighbor alkali metal cations. The cathodoluminescence of similar centers is observed in neutron-irradiated silica glasses with lithium impurities; alkali silicate glasses with Li, Na, and K cations; and glasses in the two-alkali Na-K systems. It is established that the energy of the radiative transition of a modified nonbridging oxygen hole center, namely, â¡Si-O·/Me , depends on the alkali cation type.
- Subjects
LUMINESCENCE; HOLES (Electron deficiencies); SILICATES; GLASS; ENERGY levels (Quantum mechanics); EXCITON theory
- Publication
Glass Physics & Chemistry, 2008, Vol 34, Issue 6, p709
- ISSN
1087-6596
- Publication type
Article
- DOI
10.1134/S1087659608060084