Interface effects and relaxation processes in nanocomposites based on CdSe/ZnS semiconductor quantum dots and porphyrin molecules


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Abstract

Controllable self-assembly and properties of nanocomposites based on CdSe/ZnS semiconductor quantum dots (QDs) and tetrapyridylporphyrin molecules (H2P) as well as the dynamics of relaxation processes in these systems were studied for solutions and single nanoobjects in the temperature range of 77–295 K. It was proved that the formation of surface states of different nature is crucial to nonradiative relaxation of exciton excitation in QDs. The efficiency of QD→Н2Р energy transfer was shown to be at most 10–15%. Regularities of photoluminescence (PL) quenching for QDs in nanocomposites in solutions of different polarity correlate with the dependences of PL blinking for single QDs. A scheme was proposed of excited states and main relaxation channels of exciton excitation energy in semiconductor QDs and QD–Н2Р nanocomposites.

About the authors

E. I. Zenkevich

National Technical University of Belarus

Author for correspondence.
Email: zenkev@tut.by
Belarus, 65 Prospect Nezavisimosti, Minsk, 220013

C. von Borczyskowski

Institut für Physik, Technische Universität Chemnitz

Email: zenkev@tut.by
Germany, Reichenhainer Str. 70, Chemnitz, 09126

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