DYNAMICS OF DENSE EXCITONIC SYSTEMS IN ZNSE-BASED SINGLE QUANTUM-WELLS

Time-resolved nonlinear luminescence of excitons and bi-excitons in Zn Se-based single quantum wells has been studied by means of a sub-picos econd excitation correlation technique. The enhancement in luminescenc e efficiency of bi-excitons was clearly observed in a time-correlation trace of nonlinear bi-exciton luminescence. The origin of the enhance ment was attributed to the higher-order nonlinearity with respect to t he density of bi-excitons, and was explained by considering the stimul ation of bi-exciton luminescence.