Luminescence of Free Excitons in CdI_2 : Br

概要

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The zero-phonon luminescence of free indirect-excitons and its phonon-replicas have been observed near the absorption edge in Cdl. : Br in addition tothe momentum-conserving luminescence assisted by the emission of phonons.The edge luminescence, as a whole, is enhanced at first by the mixing of CdBr., butbecomes weak as the Br- concentration increases beyond 5 mole percent. It isdeduced from the temperature dependence of the luminescence spectrum thatfree excitons have a common lifetime, and that the lifetime is governed by three(two thermal and a non-thermal) relaxation processes. The dependence of theintensity of edge luminescence on the Br- concentration is attributable to thechanges induced in the lifetime of free excitons.
社団法人日本物理学会の論文
1981-08-15