Supramolecular gating of TADF process in self-assembled nano-spheres for high-resolution OLED applications

Hsieh, Yu-Yu; Sánchez, Rafael Sánchez; Raffy, Guillaume; Shyue, Jing‐Jong; Hirsch, Lionel; Guerzo, André Del; Wong, Ken‐Tsung; Bassani, Dario M.

doi:10.1039/d1cc06120h

Cited by 6 publications

(1 citation statement)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3 DMAC-TRZ (2) was then quantitatively dibrominated using 2.2 equivalents of NBS in THF, shielded from light. 17 Finally, the DMAC-TRZ derivatives were accessed via a Suzuki-Miyaura cross-coupling of 3 with the corresponding aryl-boronic acid, the reaction was carried out in a pressure vessel at 110 °C for 48 h to improved the yield of the coupled products.…”

Section: Introductionmentioning

confidence: 99%

Aryl-substituted acridine donor derivatives modulate the transition dipole moment orientation and exciton harvesting properties of donor-acceptor thermally activated delayed fluorescence emitters, leading to highly efficient OLEDs

Crovini,

Stravou,

Sahay

et al. 2024

Preprint

View full text Add to dashboard Cite

Thermally activated delayed fluorescence (TADF) compounds are highly attractive as sensitising and emitting materials for organic light-emitting diodes (OLEDs) as they can harvest both singlet and triplet excitons and convert them into light. In this study we designed a series of derivatives of the widely studied donor-acceptor TADF emitter DMAC-TRZ with the objective of correlating their structure to their propensity to orient horizontally in vacuum-deposited doped thin films. This is important as the preferential horizontal orientation of the transition dipole moment (TDM) of the emitter, which tends to co-align with the long axis of D-A compounds, leads to enhanced light-outcoupling, and therefore higher maximum external quantum efficiencies (EQEmax) of the OLED. The decoration of the DMAC donor with substituted aryl groups also affects the emission color and the capacity for the emitters to efficiently harvest triplet excitons. The presence of electron-withdrawing 4-cyanophenyl and 4-trifluoromethylphenyl groups in, respectively, CNPh-DMAC-TRZ and CF3Ph-DMAC-TRZ blue-shifts the emission spectrum but slows down the reverse intersystem crossing rate constant (kRISC), while the opposite occurs in the presence of electron-donating groups in tBuPh-DMAC-TRZ and OMePh-DMAC-TRZ (red-shifted emission spectrum and faster kRISC). In contrast to our expectations, the OLED performance of the five DMAC-TRZ derivatives does not scale with their degree of horizontal emitter orientation but follows the kRISC rates. This, in turn, demonstrates that triplet harvesting (and not horizontal emitter orientation) is the dominant effect for device efficiency. Nonetheless, highly efficient OLEDs were fabricated with tBuPh-DMAC-TRZ and OMePh-DMAC-TRZ as emitters, with improved EQEmax (~ 28%) compared to the reference DMAC-TRZ devices.

show abstract

Section: Introductionmentioning

confidence: 99%

Aryl-substituted acridine donor derivatives modulate the transition dipole moment orientation and exciton harvesting properties of donor-acceptor thermally activated delayed fluorescence emitters, leading to highly efficient OLEDs

Crovini,

Stravou,

Sahay

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

Are nano-pesticides really meant for cleaner production? An overview on recent developments, benefits, environmental hazards and future prospectives

Rani

Duhan

Pal

et al. 2023

Journal of Cleaner Production

View full text Add to dashboard Cite

Blue shifted phosphorescence (3LE) as compared to charge transfer singlet emission (1CT) in fluorenone-amine dyads under ambient conditions

Dixit,

Agarwal

2024

Journal of Molecular Structure

View full text Add to dashboard Cite

Supramolecular gating of TADF process in self-assembled nano-spheres for high-resolution OLED applications

Abstract: Acridine-based donor-acceptor chromophores exhibiting E-type delayed fluorescence were substituted with bis-biuret H-bonding motifs to induce the formation of hollow spheres which can be deposited from solution to form the active...

Cited by 6 publications

References 25 publications

Aryl-substituted acridine donor derivatives modulate the transition dipole moment orientation and exciton harvesting properties of donor-acceptor thermally activated delayed fluorescence emitters, leading to highly efficient OLEDs

Aryl-substituted acridine donor derivatives modulate the transition dipole moment orientation and exciton harvesting properties of donor-acceptor thermally activated delayed fluorescence emitters, leading to highly efficient OLEDs

Are nano-pesticides really meant for cleaner production? An overview on recent developments, benefits, environmental hazards and future prospectives

Blue shifted phosphorescence (3LE) as compared to charge transfer singlet emission (1CT) in fluorenone-amine dyads under ambient conditions

Contact Info

Product

Resources

About