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Photoluminescence enhancement of CdSe and CdSe-ZnS nanocrystals by on-surface ligand modification
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Photoluminescence enhancement of CdSe and CdSe-ZnS nanocrystals by on-surface ligand modification
Bibliographic description
| title: | Photoluminescence enhancement of CdSe and CdSe-ZnS nanocrystals by on-surface ligand modification |
| author: | Oszajca Marek  , Lincheneau Christophe, Amelia Matteo, Schäfer Christian, Szaciłowski Konrad , Credi Alberto |
| journal title: | European Journal of Inorganic Chemistry |
| volume: | 2013 |
| issue: | 20 |
| date of publication : | 2013 |
| pages: | 3550-3556 |
| ISSN: |
1434-1948 |
| eISSN: |
1099-0682 |
| DOI: | |
| language: | English |
| journal language: | English |
| abstract in English: | We have investigated the spectroscopic properties of CdSe and CdSe–ZnS nanocrystal quantum dots (QDs) in the presence of the electron acceptor tetracyanoethene (TCNE) in organic solution. Our results indicate that TCNE reacts with the n-alkylamine capping ligands at the surfaces of nanocrystals to generate (cyanovinyl)amine products that remain bound to the surfaces of the QDs, substantially increasing their emission efficiency. Further addition of an excess of TCNE caused a decrease in the luminescence intensity, most likely because of an electron-transfer quenching process from the photoexcited nanocrystals to the electron-accepting TCNE molecules. TCNE-induced emission enhancement was also observed for the strongly luminescent CdSe–ZnS core–shell QDs. This approach enables a post-synthetic adjustment of the luminescence efficiency of amine-capped QDs. We have also shown that the threshold-dependent response of the QD emission on the TCNE concentration can be used to encode NAND and XOR Boolean logic operations. |
| keywords in English: | Boolean logic, luminescence, quantum dots, ligand effects, nanocrystals |
| departmental parameterization: | 30 |
| affiliation: | Wydział Chemii : Zakład Chemii Nieorganicznej |
| type: | journal article |
| subtype: | academic paper |
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Projekt „Repozytorium otwartego dostępu do dorobku naukowego i dydaktycznego UJ” współfinansowany w ramach poddziałania 2.3.1 „Cyfrowe udostępnianie zasobów nauki” Programu Operacyjnego Polska Cyfrowa z Europejskiego Funduszu Rozwoju Regionalnego i budżetu państwa na podstawie umowy o dofinansowanie nr POPC.02.03.01-00-0030/17-00
