Abstract

The continuous-wave photoluminescence (CW PL) spectra of a-P xSe1-x glasses of compositions x=0.66, 0.75, 0.8, and 0.84 have been investigated for a wide range of excitation energies and intensities. It is found that the Gaussian mid-gap spectra typical of glassy chalcogenides broaden dramatically for excitation energies of 2.4 eV and above. This is shown to be due to the presence of a higher-energy PL band, which is excited most efficiently at high excitation energies. This band is weaker, but still detectable, at low excitation energies for the composition a-P3Se, x=0.75, and is then clearly resolved from the mid-gap band. The high-energy band is identified with a luminescence process with a wide range of lifetimes, whose excitation spectrum is found to be sharply peaked at an energy dependent on the composition. Results of PL studies of crystalline P4Se3 are also described. It is found that the high-energy band is very much weaker in the crystal, if at all present.

Original languageEnglish
Article number016
Pages (from-to)5455-5464
Number of pages10
JournalJournal of Physics: Condensed Matter
Volume2
Issue number24
DOIs
Publication statusPublished - 1 Dec 1990

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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