The photoluminescence properties of trioctylphosphine oxide (TOPO) capped CdTe nanocrystals have been studied. The temperature dependence of the photoluminescence intensity shows that below 250 K as the temperature rises the intensity decreases, but the intensity steeply increases as the temperature rises from 300 to about 320 K. The steep increase is found to be a light induced phenomenon. The phenomenon is a macro effect of the on/off behavior of a single nanocrystal that may be governed by a photoionization.
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