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

Abstract

Controllable self-assembly and properties of nanocomposites based on CdSe/ZnS semiconductor quantum dots (QDs) and tetrapyridylporphyrin molecules (H{sub 2}P) 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→Н{sub 2}Р 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–Н{sub 2}Р nanocomposites.

Authors:
 [1];  [2]
  1. National Technical University of Belarus (Belarus)
  2. Technische Universität Chemnitz, Institut für Physik (Germany)
Publication Date:
OSTI Identifier:
22863323
Resource Type:
Journal Article
Journal Name:
Russian Chemical Bulletin
Additional Journal Information:
Journal Volume: 67; Journal Issue: 7; Other Information: Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1066-5285
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CADMIUM SELENIDES; ENERGY TRANSFER; EXCITATION; EXCITED STATES; EXCITONS; NANOCOMPOSITES; PHOTOLUMINESCENCE; PORPHYRINS; QUANTUM DOTS; QUENCHING; RELAXATION; SEMICONDUCTOR MATERIALS; TEMPERATURE RANGE 0065-0273 K; TUNNEL EFFECT; ZINC SULFIDES

Citation Formats

Zenkevich, E. I., E-mail: zenkev@tut.by, and Borczyskowski, C. von, E-mail: borczyskowski@physik.tu-chemnitz.de. Interface effects and relaxation processes in nanocomposites based on CdSe/ZnS semiconductor quantum dots and porphyrin molecules. United States: N. p., 2018. Web. doi:10.1007/S11172-018-2205-5.
Zenkevich, E. I., E-mail: zenkev@tut.by, & Borczyskowski, C. von, E-mail: borczyskowski@physik.tu-chemnitz.de. Interface effects and relaxation processes in nanocomposites based on CdSe/ZnS semiconductor quantum dots and porphyrin molecules. United States. https://doi.org/10.1007/S11172-018-2205-5
Zenkevich, E. I., E-mail: zenkev@tut.by, and Borczyskowski, C. von, E-mail: borczyskowski@physik.tu-chemnitz.de. Sun . "Interface effects and relaxation processes in nanocomposites based on CdSe/ZnS semiconductor quantum dots and porphyrin molecules". United States. https://doi.org/10.1007/S11172-018-2205-5.
@article{osti_22863323,
title = {Interface effects and relaxation processes in nanocomposites based on CdSe/ZnS semiconductor quantum dots and porphyrin molecules},
author = {Zenkevich, E. I., E-mail: zenkev@tut.by and Borczyskowski, C. von, E-mail: borczyskowski@physik.tu-chemnitz.de},
abstractNote = {Controllable self-assembly and properties of nanocomposites based on CdSe/ZnS semiconductor quantum dots (QDs) and tetrapyridylporphyrin molecules (H{sub 2}P) 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→Н{sub 2}Р 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–Н{sub 2}Р nanocomposites.},
doi = {10.1007/S11172-018-2205-5},
url = {https://www.osti.gov/biblio/22863323}, journal = {Russian Chemical Bulletin},
issn = {1066-5285},
number = 7,
volume = 67,
place = {United States},
year = {2018},
month = {7}
}