Carbazole-σ-sulfobenzimide derivative exhibiting mechanochromic thermally activated delayed fluorescence as emitter for flexible OLEDs: Theoretical and experimental insightsShow others and affiliations
2023 (English)In: Dyes and pigments, ISSN 0143-7208, E-ISSN 1873-3743, Vol. 208, article id 110841Article in journal (Refereed) Published
Abstract [en]
For the first time exploiting sulfobenzimide moiety as an acceptor unit, the new type of donor-sigma-acceptor emitter exhibiting thermally activated delayed fluorescence (TADF) is demonstrated. In different solutions, the synthesized compound emits light resulting from either locally excited carbazole moiety or trough-space charge transfer (exciplex-like) between carbazole and sulfobenzimide units. In the solid state, this emitter demonstrates aggregation-induced emission enhancement and different emission colours due to its different conformations. The mechanoluminescence of the donor-sigma-acceptor compound was observed and studied in detail by experimental and theoretical approaches including single-crystal and powder X-ray analyses. Electroluminescence of the different colours was observed when the compound was utilized as non-doped TADF emitter in rigid and flexible organic light-emitting diodes fabricated on glass or poly(ethylene terephthalate) substrates. The device fabricated on the rigid substrate exhibited the best performance with maximum current efficiency, power efficiency, and external quantum efficiency of 11.0 cd A(-1), 3.0 lm W-1, and 4.3%, respectively.
Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2023. Vol. 208, article id 110841
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-190093DOI: 10.1016/j.dyepig.2022.110841ISI: 000877795700006Scopus ID: 2-s2.0-85139824279OAI: oai:DiVA.org:liu-190093DiVA, id: diva2:1712718
Note
Funding Agencies|European Social Fund [09.3.3-LMT-K-712, 09.3.3-LMT-K-712-19-0136]; Ministry of Education and Science of Ukraine [0121U107533, 0121U109506]; Marie Curie International Research Staff Exchange Scheme within FP7- Peoples EU [PIRSES-GA-2013-612670]; Carl Tryggers Stiftelse (Sweden) [CTS 21:1430]; Research Council of Lithuania (LMTLT); National Super-computer Centre at Linkoping University (NSC) - Swedish Research Council [2018-05973]; project of scientific cooperation program between Lithuania and Ukraine "Development of highly efficient white light-emitting diodes utilizing organic emitters with exciplex and thermally-assisted fluorescence for lighting applications (LUW)" [S-LU-20-9]
2022-11-222022-11-222024-01-10