Exciton-LO-Phonon Interaction and the Anti-Stokes Emission Line in CdS
Abstract
Phonon interaction with the I1 (4888-Å) emission line in CdS (exciton bound to a neutral acceptor site) has often been observed. For the first time the optical frequency anti-Stokes transition, involving the collapse of a bound exciton, has been observed in the emission from selected platelets at 1.2°K. Since the thermally excited phonon field at this temperature is negligible, the observation of anti-Stokes emission directly supports the conclusion that LO phonons are generated to a nonthermal level of distribution as the excitons decay.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 1970
- DOI:
- 10.1103/PhysRevLett.25.1619
- Bibcode:
- 1970PhRvL..25.1619L