RED LUMINESCENCE IN PHOSPHORUS-DOPED CHEMICALLY VAPOR-DEPOSITED DIAMOND

Luminescence studies have been performed on phosphorous-doped diamond films deposited by hot-filament chemical vapor deposition. A broad lum inescence band, centered around 1.9 eV is revealed, in the cathode lum inescence spectra of homoepitaxial and polycrystalline films, whereas the blue band-A luminescence, which is characteristic for undoped diam ond, is quenched in the presence of phosphorus. The 1.9 eV luminescenc e band could not be excited by Ar+ laser light (2.54 eV) and did not s how a zero-phonon Line in the spectrum. Therefore, we suggest that thi s band is a red form of band-A luminescence, related to electron-hole recombination at substitutional phosphorous and a phosphorus-vacancy c omplex. (C) 1997 American Institute of Physics.