Development of the thermally activated delayed fluorescent red emitters with heavy atom effect

Daria Grzywacz; Michal Monka; Beata Liberek; Piotr Bojarski; Illia E Serdiuk

doi:10.1117/12.2646753

26 September 2022 Development of the thermally activated delayed fluorescent red emitters with heavy atom effect

Daria Grzywacz, Michal Monka, Beata Liberek, Piotr Bojarski, Illia E Serdiuk

Proceedings Volume PC12208, Organic and Hybrid Light Emitting Materials and Devices XXVI; PC122081J (2022) https://doi.org/10.1117/12.2646753
Event: SPIE Organic Photonics + Electronics, 2022, San Diego, California, United States

Conference Poster

Abstract

The thermally activated delayed fluorescence (TADF) emitters are currently a hotspot in organic light-emitting diode (OLED) research. Although significant progress has been made, the performance of the red / NIR devices is still insufficient. Therefore, the development of efficient fluorescent materials still remains a major challenge. TADF materials enable the conversion of non-emission triplets (T1) to emission singlet (S1) of a molecule in the form of efficient fluorescence. This transformation occurs via the reverse intersystem crossing (rISC). Acceleration of rISC while maintaining a fast fluorescence rate is supposed to be a solution that minimizes the quantum efficiency (EQE) with low stability of OLED devices. In this study, we wanted to find a molecular strategy to modify the HA of the organic TADF emiter, so that it can maintain the fluorescence ratio and increase the rISC ratio. For this purpose, we designed and synthesized red emitters with the heavy atom(s) introduced into different positions into donor. Bromine atom was chosen as the heavy atom due to the ease of introducing it by common synthetic methods. The results of photophysical studies and quantum-chemical calculations indicate that it is possible to selectively accelerate rISC by HA.

Citation Download Citation

Daria Grzywacz, Michal Monka, Beata Liberek, Piotr Bojarski, and Illia E Serdiuk "Development of the thermally activated delayed fluorescent red emitters with heavy atom effect", Proc. SPIE PC12208, Organic and Hybrid Light Emitting Materials and Devices XXVI, PC122081J (26 September 2022); https://doi.org/10.1117/12.2646753

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