We study the steady-state and time-resolved luminescent properties of $\mathrm{CdTe}$ nanocrystals by one- and two-photon excitation with a femtosecond laser. We observe that $1208\mathrm{nm}$ excitation causes a shift of the emission peak of about $20\mathrm{nm}$ to the infrared compared with $400\mathrm{nm}$ laser excitation. It is found that upconversion luminescence is composed of a photoinduced trapping and a band edge excitonic state and produces the observation of biexponential decay kinetics. We conclude that the redshift of the emission peak is caused by the relative change in luminescence intensity between excitonic and trapping states.

© 2007 Optical Society of America

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