The Effect of Stacking Fault on the Photoluminescence Spectrum of Free Exciton in GaSe (Excitons and Phonons)

The thermal equilibrium between excitons whose levels are split by the stacking fault has been studied in terms of the temperature dependence of the photoluminescence spectrum in GaSe. The result confirms that there exists an energy transfer through the lattice vibration between the split exciton states which are spatially localized