Dominant dimer emission provides colour stability for red thermally activated delayed fluorescence emitter

Cardeynaels, Tom; Etherington, Marc K.; Paredis, Simon; Batsanov, Andrei S.; Deckers, Jasper; Stavrou, Kleitos; Vanderzande, Dirk; Monkman, Andrew P.; Champagne, Benoı̂t; Maes, Wouter

doi:10.1039/d1tc04913e

Cited by 4 publications

(4 citation statements)

References 46 publications

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“…As a typical course, a red-shift of emission peaks is observed with increasing the doping load, usually ascribed to solid-state solvation 73,76 or the emergence of dimer states. 75,77,78 Solid-state solvation, in this case, may occur when a nonpolar host (e.g. CBP with D GS = 0) is used with a highly polar TADF dopant, leading to a molar stabilized CT emission at a high doping load.…”

Section: Assessing and Controlling The Conformational Disordermentioning

confidence: 99%

Understanding the temporal dynamics of thermally activated delayed fluorescence in solid hosts

Serevičius,

Skaisgiris,

Tumkevičius

et al. 2023

J. Mater. Chem. C

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Section: Assessing and Controlling The Conformational Disordermentioning

confidence: 99%

Understanding the temporal dynamics of thermally activated delayed fluorescence in solid hosts

Serevičius,

Skaisgiris,

Tumkevičius

et al. 2023

J. Mater. Chem. C

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“…This comparison is done using a selection of excitations with diverse symmetries and CT amplitudes in order to give a concise analysis of how D CT , A D CT , and EM D CT handle possible scenarios that might arise when dealing with charge transfer excitations. With the exception of the p -nitro- N , N -dimethylaniline series, all examined structures are taken from previous works within our group and are known to display either TADF or SOCT-ISC (Figure , full names can be found in the Supporting Information, Section S1). − The final section of this article is dedicated to the analysis of other widely used CT indicators with respect to the ones that are already discussed.…”

Section: Introductionmentioning

confidence: 99%

Earth Mover’s Charge Transfer Distance: A General and Robust Approach for Describing Excited State Locality

Fraiponts,

Maes,

Champagne

2024

J. Chem. Theory Comput.

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A novel approach for assessing the extent of electron displacement in optical transitions is proposed by implementing the Earth Mover's Distance (EMD) method, which quantifies the spatial dissimilarity between ground and excited state electron density distributions. In contrast to previous descriptors, this index provides a representative and intuitively understandable distance under a robust and computationally efficient scheme for all possible forms of locality, even in the most difficult to dissect topological cases. The theoretical differences among the existing indices and our method are first illustrated with the help of a simplified model system, followed by a benchmarking of several partial atomic charge models using experimentally relevant push−pull compounds with diverse symmetries. These same molecules are finally employed to further demonstrate the principal advantages of the EMD index and its capabilities in rationalizing charge transfer phenomena.

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“…The excitation of push–pull dyes involves intramolecular charge transfer [ 3 , 4 , 5 ]. The push–pull dye 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) [ 18 , 19 , 20 ] has been successfully utilized in OLEDs [ 21 , 22 , 23 ] and as photocatalysts for organic reactions [ 24 , 25 , 26 , 27 , 28 ], the hydrogen photoevolution reaction [ 29 ], and CO 2 photoreduction [ 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

One-Step Electropolymerization of a Dicyanobenzene-Carbazole-Imidazole Dye to Prepare Photoactive Redox Polymer Films

Liu,

Perez,

Lavergne

et al. 2023

Polymers

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To the best of our knowledge, this study reports the first direct electropolymerization of a dicyanobenzene-carbazole dye functionalized with an imidazole group to prepare redox- and photoactive porous organic polymer (POP) films in controlled amounts. The POP films were grown on indium-doped tin oxide (ITO) and carbon surfaces using a new monomer, 1-imidazole-2,4,6-tri(carbazol-9-yl)-3,5-dicyanobenzene (1, 3CzImIPN), through a simple one-step process. The structure and activities of the POP films were investigated as photoelectrodes for electrooxidations, as heterogeneous photocatalysts for photosynthetic olefin isomerizations, and for solid-state photoluminescence behavior tunable by lithium-ion concentrations in solution. The results demonstrate that the photoredox-POPs can be used as efficient photocatalysts, and they have potential applications in sensing.

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Dominant dimer emission provides colour stability for red thermally activated delayed fluorescence emitter

Abstract: 4DTPIPN has a strong tendency for dimer formation, even in dilute film, and possesses a higher colour purity than 4CzIPN but this is traded-off against the photoluminescence quantum yield. (Credit to LeStudio/Shutterstock for the James Bond themed background.)

Cited by 4 publications

References 46 publications

Understanding the temporal dynamics of thermally activated delayed fluorescence in solid hosts

Understanding the temporal dynamics of thermally activated delayed fluorescence in solid hosts

Earth Mover’s Charge Transfer Distance: A General and Robust Approach for Describing Excited State Locality

One-Step Electropolymerization of a Dicyanobenzene-Carbazole-Imidazole Dye to Prepare Photoactive Redox Polymer Films

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