Thianthrene and acridan-substituted benzophenone or diphenylsulfone: Effect of triplet harvesting via TADF and phosphorescence on efficiency of all-organic OLEDS

Tomkevičienė, Aušra; Matulaitis, Tomas; Gužauskas, Matas; Andrulevičienė, Viktorija; Volyniuk, Dmytro

doi:10.1016/j.orgel.2019.04.025

Cited by 32 publications

(14 citation statements)

References 52 publications

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“…Symmetric emitters Px2BP 12 , DMAC-BP 47 , Cz2BP 12 and CC2BP 12 contain phenoxazine (PXZ), dimethylacridine (DMAC) and carbazole (Cz) donors (in blue), respectively. Asymmetric emitters, A-BP-TA 48 and OPDPO 49 include donor groups such as thianthrene, phenothiazene (PTZ) and diphenylphosphineoxide.…”

Section: Resultsmentioning

confidence: 99%

Photophysical Properties of Benzophenone Based TADF Emitters in Relation to Their Molecular Structure

Baş

Ulukan

Monari

et al. 2021

Preprint

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Thermally activated delayed fluorescence (TADF) materials are commonly used in various apparatus, including organic light emitting device (OLED)-based displays, as they remarkably improve the internal quantum efficiencies (IQE). Alt-hough there is a wide range of donor-acceptor based compounds possessing TADF properties, in this computational study we investigated TADF and some non-TADF chromophores, containing benzophenone or its structural derivatives as the acceptor core, together with various donor moieties. Following the computational modeling of the emitters, several excited state properties, such as the absorption spectra, singlet-triplet energy gaps (∆EST), natural transition orbitals (NTO) and the topological ΦS indices, have been computed. Along with the donor-acceptor torsion angles and spin-orbit coupling (SOC) values, these descriptors have been utilized to investigate potential TADF efficiency. Our study has shown that on the one hand, our photophysical/structural descriptors and computational methodologies predict the experi-mental results quite well, on the other hand, our extensive benchmark can be useful to pinpoint the most promising func-tionals and descriptors for the study of benzophenone based TADF emitters.

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Section: Resultsmentioning

confidence: 99%

Photophysical Properties of Benzophenone Based TADF Emitters in Relation to Their Molecular Structure

Baş

Ulukan

Monari

et al. 2021

Preprint

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“…Since non-radiative rates of toluene solutions of compounds 1 and 4 were much lower than those of toluene solutions of other compounds (Table S1), different PLQY values were obtained for compounds 1-6. PLQY values (26-53%) of non-doped films of the compounds were still much below unity apparently because of intermolecular quenching which may be partly overcome by appropriate hosting [32]. Indeed, using 1,3-bis(N-carbazolyl)benzene (mCP) as the host, the doped films with 10% wt.…”

Section: Plqy % Nmmentioning

confidence: 99%

Towards Blue AIE/AIEE: Synthesis and Applications in OLEDs of Tetra-/Triphenylethenyl Substituted 9,9-Dimethylacridine Derivatives

et al. 2020

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Aiming to design blue fluorescent emitters with high photoluminescence quantum yields in solid-state, nitrogen-containing heteroaromatic 9,9-dimethylacridine was refined by tetraphenylethene and triphenylethene. Six tetra-/triphenylethene-substituted 9,9-dimethylacridines were synthesized by the Buchwald-Hartwig method with relatively high yields. Showing effects of substitution patterns, all emitters demonstrated high fluorescence quantum yields of 26–53% in non-doped films and 52–88% in doped films due to the aggregation induced/enhanced emission (AIE/AIEE) phenomena. In solid-state, the emitters emitted blue (451–481 nm) without doping and deep-blue (438–445 nm) with doping while greenish-yellow emission was detected for two compounds with additionally attached cyano-groups. The ionization potentials of the derivatives were found to be in the relatively wide range of 5.43–5.81 eV since cyano-groups were used in their design. Possible applications of the emitters were demonstrated in non-doped and doped organic light-emitting diodes with up to 2.3 % external quantum efficiencies for simple fluorescent devices. In the best case, deep-blue electroluminescence with chromaticity coordinates of (0.16, 0.10) was close to blue color standard (0.14, 0.08) of the National Television System Committee.

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“…Such long lifetimes of up to milliseconds further prove the origin of the RTP in these molecules. 50 Interestingly, RTP lifetimes are substantially reduced with the increasing concentration of the dopants. Such increase in the F P values and decrease in the RTP lifetimes may originate due to the strong intermolecular interactions between the dopant and the host material which contribute to the reduction of the nonradiative decay through vibrations.…”

Section: Emission Characteristics In Dpepo Filmsmentioning

confidence: 99%

Asymmetric-donor (D₂D₂′)–acceptor (A) conjugates for simultaneously accessing intrinsic blue-RTP and blue-TADF

Bhatia

Ray

2020

Mater. Adv.

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Thianthrene and acridan-substituted benzophenone or diphenylsulfone: Effect of triplet harvesting via TADF and phosphorescence on efficiency of all-organic OLEDS

Cited by 32 publications

References 52 publications

Photophysical Properties of Benzophenone Based TADF Emitters in Relation to Their Molecular Structure

Photophysical Properties of Benzophenone Based TADF Emitters in Relation to Their Molecular Structure

Towards Blue AIE/AIEE: Synthesis and Applications in OLEDs of Tetra-/Triphenylethenyl Substituted 9,9-Dimethylacridine Derivatives

Asymmetric-donor (D₂D₂′)–acceptor (A) conjugates for simultaneously accessing intrinsic blue-RTP and blue-TADF

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Thianthrene and acridan-substituted benzophenone or diphenylsulfone: Effect of triplet harvesting via TADF and phosphorescence on efficiency of all-organic OLEDS

Cited by 32 publications

References 52 publications

Photophysical Properties of Benzophenone Based TADF Emitters in Relation to Their Molecular Structure

Photophysical Properties of Benzophenone Based TADF Emitters in Relation to Their Molecular Structure

Towards Blue AIE/AIEE: Synthesis and Applications in OLEDs of Tetra-/Triphenylethenyl Substituted 9,9-Dimethylacridine Derivatives

Asymmetric-donor (D2D2′)–acceptor (A) conjugates for simultaneously accessing intrinsic blue-RTP and blue-TADF

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Asymmetric-donor (D₂D₂′)–acceptor (A) conjugates for simultaneously accessing intrinsic blue-RTP and blue-TADF