Journal
DYES AND PIGMENTS
Volume 173, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2019.108008
Keywords
Quinoxaline; OLEDs; Donor-acceptor; Exciplex; Conjugation length; Organic emitter
Funding
- project Iuventus Plus, Poland [0440/IP3/2016/74]
- Ministry of Education and Science of Ukraine [0117U003908, 0118U003862]
- Olle Engkvist Byggmastare foundation [189-0223]
- High Performance Computing Center North (HPC2N) in Umea, Sweden, through the project Multiphysics Modelling of Molecular Materials [SNIC 2018-2-38]
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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.
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