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Multi-channel electroluminescence of CdTe/CdS core-shell quantum dots implemented into a QLED device
Lviv Polytech Natl Univ, Stepan Bandera 12, UA-79013 Lvov, Ukraine.
Lviv Polytech Natl Univ, Stepan Bandera 12, UA-79013 Lvov, Ukraine.
Lviv Polytech Natl Univ, Stepan Bandera 12, UA-79013 Lvov, Ukraine.
Lviv Polytech Natl Univ, Stepan Bandera 12, UA-79013 Lvov, Ukraine;Rzeszow Univ Technol, Al Powstancow Warszawy 12, PL-35959 Rzeszow, Poland.
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2019 (English)In: Dyes and pigments, ISSN 0143-7208, E-ISSN 1873-3743, Vol. 162, p. 647-653Article in journal (Refereed) Published
Abstract [en]

CdTe/CdS core-shell quantum dots were synthesized and implemented into a light emitting device resulting in multi-channel electroluminescence with a light-green emission color. The main electroluminescence band at about 530 nm corresponds to the emission by the CdTe core (type I core/shell structure), while the next emission band at 595 nm is assigned to the crossed recombination of electrons from the conduction band of the CdS shell and holes from the valence band of the CdTe core (type II core/shell structure). At the same time, the photoluminescence spectrum of the synthesized CdTe/CdS core-shell quantum dots contains only one emission band distinctive for type II structures. This behavior of CdTe/CdS core-shell quantum dots upon the electroexcitation allows the extension of the electroluminescence spectrum in the optical region in a way that is useful for lighting source applications. Such multi-channel electroluminescence can most probably also be reproduced in related core-shell systems accounting for size-confinement between the core size and shell thickness.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 162, p. 647-653
Keywords [en]
Quantum dots, Core-shell structures, Electroluminescence, Photoluminescence, QLED
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-376711DOI: 10.1016/j.dyepig.2018.10.074ISI: 000456226500073OAI: oai:DiVA.org:uu-376711DiVA, id: diva2:1288261
Funder
EU, Horizon 2020Carl Tryggers foundation , CTS 17:514Available from: 2019-02-12 Created: 2019-02-12 Last updated: 2019-02-12Bibliographically approved

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Ågren, Hans

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