Radiation-induced luminescence of pyrolytic boron nitride

Citation
Va. Stepanov et Pa. Stepanov, Radiation-induced luminescence of pyrolytic boron nitride, OPT SPECTRO, 85(6), 1998, pp. 893-897
Citations number
16
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
OPTICS AND SPECTROSCOPY
ISSN journal
0030400X → ACNP
Volume
85
Issue
6
Year of publication
1998
Pages
893 - 897
Database
ISI
SICI code
0030-400X(199812)85:6<893:RLOPBN>2.0.ZU;2-E
Abstract
Luminescence spectra of pyrolytic boron nitride are obtained upon photoexci tation at 315, 365, and 403 nm. It is shown that luminescent centers repres ent intrinsic defects which have a quasi-continuous band of levels in the e nergy gap and are localized in the regions near the boundary of grains. The spectra of radiation-induced luminescence (RIL) of pyrolytic boron nitride are obtained upon its irradiation by 8.13 MeV-protons with an intensity of 3.2 x 10(12) cm(-2) s(-1). A linear irreversible decrease in the RIL inten sity with increasing irradiation dose was observed. At a dose of 1.88 x 10( 16) cm(-2), the RIL intensity saturates. The saturation effect is connected with radiation-induced structural changes on the surfaces of the grains ca used by the electron-hole relaxation and a considerable increase in the sel f-diffusion coefficients.