Abstract
Abstract Results are presented of a detailed study of optical transitions from the excited states of the photoluminescence (PL) centres in c-As2Se3, including the first observation of photo-induced optical absorption (PA) arising from these states. It is inferred from observations of the decay rates and polarization dependences of the PL and PA that the lowest excited state of the PL centre is a triplet exciton state, and that the singlet-triplet splitting is 4 × 10−3 eV. The PA in the spectral range measured (0·4–2 eV) appears to probe transitions from the excttcd PL centres to states in the continuum. Also observed for the first time is PA from the excited states of the PL centres in a-As2Se3. The properties of the PL centres in a-As2Se3 and c-As2Se3 are compared.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
