  We have investigated the temperature dependence of the photoluminescence
spectra and average photoluminescence decay rate of CdTe quantum dot monolayers
of different sizes as a function of concentration in the range 77 K to 296 K.
It is shown that a simple three level analytic model involving bright and dark
exciton states can only describe the lower temperature data but is unable to
satisfactorily fit the data over the full temperature range. An extended model
which includes external trap states is necessary to fit the data above
approximately 150 K. Parameters for the model are obtained using both temporal
and spectral data. The model indicates that the efficiency of interaction with
trap states increases as the QD monolayer concentration increases, which is
likely due to an increase in the density of available traps.
