Spatial diffusion of highly created excitons in CdS
- 123 Downloads
The exciton density is determined in CdS from the magnetic field dependence of the triplet-exciton emission intensity. The result shows that the exciton density is saturated markedly for very intense excitations by a nitrogen laser. This behavior is analyzed in terms of the diffusion process of optically created particles from the generated surface to the interior of the crystal. The diffusion length is found to be enhanced by two orders of magnitude for high excitations. This fast diffusion is ascribed to the high-density electron-hole plasma created at the crystal surface.
KeywordsExcitation Power Magnetic Field Dependence Exciton Emission Excitation Density Exciton Line
- 1).Y. Oka and T. Kushida: Solid State Commun. 15 (1974) 1571.Google Scholar
- 2).E. Hanamura: J. Phys. Soc. Japan 29 (1970) 50, ibid 37 (1974) 1545.Google Scholar
- 3).R. F. Leheny, R. E. Nahory, and K. L. Shaklee: Phys. Rev. Letters 28 (1972) 437.Google Scholar
- 4).H. Kuroda and S. Shionoya: J. Phys. Soc. Japan 36 (1974) 467.Google Scholar