Abstract
We report reversible and irreversible spectral changes during the photoluminescence (PL) blinking of single CdSe/ZnS core/shell semiconductor nanocrystals on glass and gold substrates. Under prolonged intense light illumination, time traces of spectrally resolved PL can be classified into reversible and irreversible periods before the PL is completely quenched. During the irreversible PL blinking period, very large spectral shifts occur during on times and after off times, compared with the reversible PL period. The clear blueshift of the PL peak energy is also observed on glass and gold substrates in air. The PL blinking mechanism and photodegradation of nanocrystals are discussed in light of the spectral shift during PL blinking.
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