Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
We present the newly designed and synthesized derivative utilizing carbazole as a donor and for the first time sulfobenzimide as an acceptor via non-conjugated linker. Measurements of the solutions of different polarities revealed the emission of locally excited states and through-space charge transfer. The solid-state films of the emitter exhibited aggregation-induced emission enhancement, emission variations due to conformations, mechanochromic luminescence and blue thermally activated delayed fluorescence (TADF). Ionization potential of 6.08 eV and electron affinity of 2.65 eV were estimated and these values are found to be favourable for hole and electron injection in the layers of optoelctronic devices. The compound is also characterized by bipolar charge transport with balanced hole and electron drift mobilities values. It was exploited in a doping free emitting layer of flexible and rigid organic light emitting diodes (OLED) exploiting colour-tunable properties of the compound reaching the maximum value of 4.3% of external quantum efficiency.
This research was funded by the European Social Fund under the No 09.3.3-LMT-K-712 “Development of Competences of Scientists, other Researchers and Students through Practical Research Activities” measure (Project No 09.3.3-LMT K-712-19-0136). This work was supported by the 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)” (grant No. S-LU-20-9) under grant agreement with the Research Council of Lithuania (LMTLT). This work was also supported by the Ministry of Education and Science of Ukraine (project no. 0121U107533 and 0121U109506). The financial support of the Marie Curie International Research Staff Exchange Scheme within FP7- Peoples EU project No. PIRSES-GA-2013-612670 is gratefully acknowledged. G. B. thanks the support by the Swedish Research Council (No. 2020-04600) and to Carl Tryggers Foundation (CTS 21:1430). The quantum-chemical calculations were performed with computational resources provided by the Swedish National Infrastructure for Computing (SNIC 2022/5-103) at the National Supercomputer Centre at Linkoping University (NSC) partially funded by the Swedish Research Council through Grant Agreement No. 2018-05973.
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