H. Kondo et al., HIGH-DENSITY EXCITON BEHAVIOR AND BI-EXCITON STATES ON THE STACKING-FAULT EXCITONS IN BII(3), Journal of luminescence, 60-1, 1994, pp. 658-660
The high density effects of excitons excited at a two-dimensional stac
king-fault plane in layered BiI3 crystal is investigated. The blue-shi
ft and broadening have been observed for the high density excitation.
A new transition appears below the resonance exciton energies, which i
s attributed to the two-photon transition to a bi-exciton state.