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The effect of molecular structure on the properties of quinoxaline-based molecules for OLED applications
Silesian Tech Univ, Fac Chem, PL-44100 Gliwice, Poland..
Silesian Tech Univ, Fac Chem, PL-44100 Gliwice, Poland..
Lviv Polytech Natl Univ, S Bandera 12, UA-79013 Lvov, Ukraine..
Lviv Polytech Natl Univ, S Bandera 12, UA-79013 Lvov, Ukraine..
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2020 (English)In: Dyes and pigments, ISSN 0143-7208, E-ISSN 1873-3743, Vol. 173, article id 108008Article in journal (Refereed) Published
Abstract [en]

Different donor-acceptor-donor (D-A-D) and donor-pi-bridge-acceptor-pi-bridge-donor (D-pi-A-pi-D) systems based on a quinoxaline acceptor are compared. A significant difference in electrochemical and photophysical properties was found depending on molecular structure. A luminescence shift from 539 rim up to 671 nm was observed upon extension of conjugation length. The studied compounds were tested in fluorescent organic light emitting diodes (OLEDs) demonstrating an external quantum efficiency up to 4.5% for a deep red non-doped device and 7% when doped into an exciplex host device. A quantum-chemical interpretation of the electroluminescence spectra for the fabricated OLEDs was carried out including modelling of excimers and exciplexes.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2020. Vol. 173, article id 108008
Keywords [en]
Quinoxaline, OLEDs, Donor-acceptor, Exciplex, Conjugation length, Organic emitter
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-266539DOI: 10.1016/j.dyepig.2019.108008ISI: 000503312700128Scopus ID: 2-s2.0-85075456173OAI: oai:DiVA.org:kth-266539DiVA, id: diva2:1391043
Note

QC 20200203

Available from: 2020-02-03 Created: 2020-02-03 Last updated: 2020-02-17Bibliographically approved

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