Abstract
In this work, we demonstrate dibenzothiophene sulfoximine derivatives as building blocks for constructing emitters featuring both thermally activated delayed fluorescent (TADF) and aggregation-induced emission (AIE) properties, with multiple advantages including high chemical and thermal stability, facile functionalization, as well as tunable electron-accepting ability. A series of phenoxazine-dibenzothiophene sulfoximine structured TADF emitters were successfully synthesized and their photophysical and electroluminescent properties were evaluated. The electroluminescence devices based on these emitters displayed diverse emissions from yellow to orange and reached external quantum efficiencies (EQEs) of 5.8% with 16.7% efficiency roll-off at a high brightness of 1000 cd·m−2.
Highlights
Materials with thermally activated delayed fluorescence (TADF) have been extensively explored since the pioneering research by Adachi et al [1]
The theoretical 100% internal quantum efficiency (IQE) of organic light-emitting diodes (OLEDs) based on TADF emitters is enabled by efficient reverse intersystem crossing (RISC) of the triplet excitons to singlet excited states [7,8,9,10,11]
The 1H nuclear magnetic resonance (NMR) and 13C NMR spectra were in good agreement with the structure of the TADF molecules of PXZ-SFIP, PXZ-SFIC, and PXZ-SFIS
Summary
Materials with thermally activated delayed fluorescence (TADF) have been extensively explored since the pioneering research by Adachi et al [1]. Improvements in device performance heavily rely on judicious molecular design guided by structure–property relationship investigations [23,24,25]. It has been demonstrated by numerous reports that conjugation of nitrogen-containing aromatics (i.e., carbazole [26], dimethylacridane [27], phenoxazine [28,29]) with acceptors such as aza-aromatic rings [15,16,17,18,19], ketones [29,30,31], Molecules 2021, 26, 5243 vestigations [23,24,25]. The LUMO energy levels of the compounds were calculated according to the HOMO values and the absorption on-set of the longer wavelength
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