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5 March 2019 The importance of the chromophore rigidity on the efficiency of TADF emitters (Conference Presentation)
Nadzeya Kukhta, Andrei S. Batsanov, Martin R. Bryce, Andrew P. Monkman
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Proceedings Volume 10915, Organic Photonic Materials and Devices XXI; 109150X (2019) https://doi.org/10.1117/12.2507895
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
A plethora of various colour TADF emitters was reported during the recent years. However, only few deep blue emitters possessing good colour purity as well as relevant stability were introduced [1-3]. For efficient TADF to take place, the occurrence of strong charge transfer is required. In turn, charge transfer demands the presence of fairly strong donor and acceptor units, which usually have a rigid molecular skeleton. However, the involvement of strong chromophores is known to lower the values of 1CT and 3LE states, which makes it difficult to obtain deep blue emission, even though vanishing ∆EST can be reached. Therefore, in order to design a deep blue TADF emitter, more flexible units have to be involved. Hence, in this work we show how by manipulation of the rigidity of the donor unit it is possible to find the trade-off between the properties of deep blue TADF emitters. Thus, here we present four derivatives of 9,9-dimethylthioxanthene-S,S-dioxide featuring 10,11-dihydro-5H-dibenz[b,f]azepine and diphenylamine donors attached in different fashion. Thorough photophysical investigation is provided. Theoretical approach is involved for better understanding of the observed results. [1] J. Mater. Chem. C 2014, 2 (3), 421–424. [2] Chem. Mater. 2015, 27 (19), 6675–6681. [3] Chem. Mater. 2017, 29 (21), 9154–9161.
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Nadzeya Kukhta, Andrei S. Batsanov, Martin R. Bryce, and Andrew P. Monkman "The importance of the chromophore rigidity on the efficiency of TADF emitters (Conference Presentation)", Proc. SPIE 10915, Organic Photonic Materials and Devices XXI, 109150X (5 March 2019); https://doi.org/10.1117/12.2507895
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KEYWORDS
Chromophores
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