Y. Masumoto et al., TIME-RESOLVED LUMINESCENCE STUDY OF BIEXCITONS IN CUCL QUANTUM DOTS, Physical review. B, Condensed matter, 49(15), 1994, pp. 10782-10785
Population dynamics of excitons and biexcitons in nanometer-sized CuCl
microcrystallites (nanocrystals) was studied with a time-resolved lum
inescence measurement. A recurring process between excitons and biexci
tons was clearly observed as a function of the second decay component
of the biexciton luminescence and with an increase of the exciton lumi
nescence. They become prominent with an increase in the excitation int
ensity. The biexciton luminescence is broadened asymmetrically to high
er energy with an increase in the biexciton density. These temporal as
well as spectral characteristics of biexciton luminescence are inhere
nt to CuCl nanocrystals but are not observed in a CuCl bulk crystal, w
hich shows that biexcitons are much more efficiently formed from excit
ons in a CuCl nanocrystal than in a CuCl bulk crystal.