Ultrafast carrier dynamics in CdS-doped glasses

Abstract

Luminescence dynamics of CdS-doped glasses were measured using up-conversion technique, and they were compared with transmission dynamics. An analysis of the decay curves of luminescence and transmission dynamics has been performed using a multi-exponential fit.Although slower decay component is large in transmission dynamics, it is negligibly small in luminescence dynamics. This difference is observed in all samples investigated, and this may be caused by the difference in relaxation paths of electrons and holes in CdS nanocrystals. Effect of induced absorption on transmission dynamics was examined.

Ultrafast Carrier Dynamics in CdSSe Nanocrystals in Glass Matrix

“…The decay constants of all the samples were about 1 ps. These results are similar to those for CdS-doped glasses 7). Therefore, the effect of alloying on carrier dynamics is considered to be small in CdSSe nanocrystals in glass.It is interesting to compare the photoluminescence dynamics with the results of transient absorption in the infrared range (3 mm) and DFWM experiment we reported recently 6).…”

“…The obtained results were compared with those reported in the previous paper, 6) The photoluminescence dynamics complete the information on carrier relaxation as they reflect relaxation of both electrons and holes, whereas the transient absorption and DFWM are affected by electrons. The results were also compared with those for the ultrafast photoluminescence dynamics of CdS nanocrystals in glass matrixes, 7) in order to examine the effect of alloying on carrier dynamics.…”

“…These results are similar to those for CdS-doped glasses. 7) Therefore, the effect of alloying on carrier dynamics is considered to be small in CdSSe nanocrystals in glass.…”