Effects of electron tunneling and nonresonance quenching of photoluminescence in semiconducting CdSe/ZnS AND CdSe nanocrystals by porphyrin molecules in joint complexes |
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| Authors: | É I Zen’kevich Th Blaudeck M Heidernätsch F Cichos C von Borczyskowski |
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| Institution: | 1.Belarusian National Technical University,Minsk,Belarus;2.Institute for Print and Media Technology,Chemnitz University of Technology,Chemnitz,Germany;3.Center for Nanostructured Materials and Analytics, Institute of Physics,Chemnitz University of Technology,Chemnitz,Germany;4.Molecular Nanophotonics, Institute of Experimental Physics I,University of Leipzig,Leipzig,Germany |
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| Abstract: | The quenching of photoluminescence (PL) in semiconducting CdSe/ZnS and CdSe nanocrystals (NC) of various sizes during surface
passivation by molecules of tetrapyridylporphyrins (P) in toluene at 295 K was investigated. It was shown that resonance transfer
of energy NC → P plays a minor role in PL quenching (<10%), while photoinduced electron transfer NC → P is absent. On the
basis of experimental data and quantum-mechanical calculations it was established that with identical molar ratio x = CP/CNC the probability of quenching k
q
decreases with increase in the size of the NC while the PL quenching process itself under conditions of quantum confinement
is due to electron tunneling of the excited electron–hole pair on the surface of the NC followed by localization of the organic
ligand (P) on anchor groups. The obtained results are of interest for investigating the mechanisms of the blinking of PL in
single semiconductor nanocrystals.
Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 45, No. 1, pp. 17–26, January–February, 2009. |
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| Keywords: | semiconductor nanocrystals porphyrins quantum-dimensional effects quenching of photoluminescence resonance energy transfer electron tunneling surface states |
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