Photoluminescence enhancement of CdSe and CdSe-ZnS nanocrystals by on-surface ligand modification

2013
journal article
article
cris.lastimport.wos2024-04-09T19:40:26Z
dc.abstract.enWe 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.pl
dc.affiliationWydział Chemii : Zakład Chemii Nieorganicznejpl
dc.contributor.authorOszajca, Marek - 126152 pl
dc.contributor.authorLincheneau, Christophepl
dc.contributor.authorAmelia, Matteopl
dc.contributor.authorSchäfer, Christianpl
dc.contributor.authorSzaciłowski, Konrad - 132185 pl
dc.contributor.authorCredi, Albertopl
dc.date.accessioned2015-01-19T13:38:02Z
dc.date.available2015-01-19T13:38:02Z
dc.date.issued2013pl
dc.description.admin[AB] Szaciłowski, Konrad [SAP11115985] 50000141pl
dc.description.number20pl
dc.description.physical3550-3556pl
dc.description.points30pl
dc.description.volume2013pl
dc.identifier.doi10.1002/ejic.201300331pl
dc.identifier.eissn1099-0682pl
dc.identifier.issn1434-1948pl
dc.identifier.urihttp://ruj.uj.edu.pl/xmlui/handle/item/2628
dc.languageengpl
dc.language.containerengpl
dc.rights.licencebez licencji
dc.subject.enBoolean logicpl
dc.subject.enluminescencepl
dc.subject.enquantum dotspl
dc.subject.enligand effectspl
dc.subject.ennanocrystalspl
dc.subtypeArticlepl
dc.titlePhotoluminescence enhancement of CdSe and CdSe-ZnS nanocrystals by on-surface ligand modificationpl
dc.title.journalEuropean Journal of Inorganic Chemistrypl
dc.typeJournalArticlepl
dspace.entity.typePublication
cris.lastimport.wos
2024-04-09T19:40:26Z
dc.abstract.enpl
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.
dc.affiliationpl
Wydział Chemii : Zakład Chemii Nieorganicznej
dc.contributor.authorpl
Oszajca, Marek - 126152
dc.contributor.authorpl
Lincheneau, Christophe
dc.contributor.authorpl
Amelia, Matteo
dc.contributor.authorpl
Schäfer, Christian
dc.contributor.authorpl
Szaciłowski, Konrad - 132185
dc.contributor.authorpl
Credi, Alberto
dc.date.accessioned
2015-01-19T13:38:02Z
dc.date.available
2015-01-19T13:38:02Z
dc.date.issuedpl
2013
dc.description.adminpl
[AB] Szaciłowski, Konrad [SAP11115985] 50000141
dc.description.numberpl
20
dc.description.physicalpl
3550-3556
dc.description.pointspl
30
dc.description.volumepl
2013
dc.identifier.doipl
10.1002/ejic.201300331
dc.identifier.eissnpl
1099-0682
dc.identifier.issnpl
1434-1948
dc.identifier.uri
http://ruj.uj.edu.pl/xmlui/handle/item/2628
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights.licence
bez licencji
dc.subject.enpl
Boolean logic
dc.subject.enpl
luminescence
dc.subject.enpl
quantum dots
dc.subject.enpl
ligand effects
dc.subject.enpl
nanocrystals
dc.subtypepl
Article
dc.titlepl
Photoluminescence enhancement of CdSe and CdSe-ZnS nanocrystals by on-surface ligand modification
dc.title.journalpl
European Journal of Inorganic Chemistry
dc.typepl
JournalArticle
dspace.entity.type
Publication
Affiliations

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