New Journal of Chemistry, Journal Year: 2024, Volume and Issue: 48(36), P. 16119 - 16126
Published: Jan. 1, 2024
Two new multi-resonance (MR) blue emitters with benzothiophene within B/N skeletons exhibit emissions narrow FWHMs, achieving high PLQYs and long device lifetimes.
Language: Английский
Chemical Reviews, Journal Year: 2024, Volume and Issue: unknown
Published: Dec. 12, 2024
Since the seminal report by Adachi and co-workers in 2012, there has been a veritable explosion of interest design thermally activated delayed fluorescence (TADF) compounds, particularly as emitters for organic light-emitting diodes (OLEDs). With rapid advancements innovation materials design, efficiencies TADF OLEDs each primary color points well white devices now rival those state-of-the-art phosphorescent emitters. Beyond electroluminescent devices, compounds have also found increasing utility applications numerous related fields, from photocatalysis, to sensing, imaging beyond. Following our previous review 2017 (
Language: Английский
Citations
22
Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown
Published: April 21, 2024
Abstract In the development of organic light‐emitting diodes (OLEDs) with high efficiency and minimal roll‐off, fast reverse intersystem crossing (RISC) in multi‐resonance thermally activated delayed fluorescence (MR‐TADF) materials is critical. The RISC process typically hindered by insufficient spin‐orbital coupling (SOC). Incorporating heavy atom selenium into MR‐TADF structure has potential to enhance SOC through effect. However, specific placement within molecule results different enhancements SOC, detailed interplay between these factors yet be elucidated. introduction a selenium‐containing moiety, phenoxaselenine, at substituted positions undertaken, revealing that 3‐substituted phenoxaselenine exhibits faster transition significant increase higher triplet excited states S 1 state, compared 2‐substituted phenoxaselenine. Significantly reduced roll‐off achieved for narrow‐band emission OLEDs based on owing enhanced effect, giving an impressive external quantum above 20% even under 10 000 cd m −2 corresponding OLED device. These underscore strategic effect manipulation efficient spin‐flipping.
Language: Английский
Citations
18
Science China Chemistry, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 13, 2025
Language: Английский
Citations
2
Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(21)
Published: April 9, 2024
Abstract While the development of solution‐processed organic light‐emitting diodes (sOLEDs) utilizing multiple resonance‐induced thermally activated delayed fluorescence (MR‐TADF) is highly significant, it restricted by limited solubility and film‐forming property resulting from rigid conjugate planarity MR‐TADF materials. Herein, an effective strategy presented to obtain narrowband emitters introducing inert steric bulky hindrance group into resonance skeleton, thereby mitigating issues arising intermolecular packing‐induced poor solution processing ability quenching effects. The target emitter, designed as 3CzSF‐BN, exhibits pure‐green emission with a peak at 520 nm small full width half maximum (FWHM) 30 (0.14) eV. Remarkably, achieves exceptional photoluminescence quantum yield (PLQY) 100% notable advancements in attributes. optimized bottom‐emitting sOLED (BE‐sOLED) device external efficiency (EQE) over 20% Commission Internationale de I’Éclairage (CIE) coordinates (0.214, 0.716). Notably, top‐emitting (TE‐sOLED) ultra‐pure green color FWHM 22 CIE (0.138, 0.771), highlighting effectiveness this designing high‐performance
Language: Английский
Citations
11
Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 489, P. 151517 - 151517
Published: April 22, 2024
Language: Английский
Citations
10
Advanced Materials, Journal Year: 2024, Volume and Issue: 36(31)
Published: May 23, 2024
Luminescent materials with narrowband emission have extraordinary significance for developing ultrahigh-definition display. B-N-containing multiple resonance thermally activated delayed fluorescence (MR-TADF) are strong contenders. However, their device performances pervasively encounter detrimental aggregation-caused quenching effect that is highly vulnerable to doping concentration, complicating fabrication. Therefore, constructing efficient and concentration-independent MR-TADF emitters of pragmatic importance improving controllability reproducibility, simplifying manufacturing procedures, conserving production costs. Here, by systematic arrangement donor triphenylamine fluorophore BNCz on distinct bridges, a spatial confinement strategy has been developed donor-bridge-fluorophore architecture. Structurally fine modulation progressive evolution construct molecular entities congested steric hindrance can suppress intermolecular interactions without substantially affecting the luminescence tone BNCz, resulting in emitters; through isomer engineering, two isomers BN-PCz-TPA TPA-PCz-BN different crystal stacking patterns synthesized altering connection mode between BNCz. As result, BN-PCz-TPA-based showcases maximum external quantum efficiency (EQE) 36.3% narrow full-width at half-maximum 27 nm 10 wt% concentration. Even 20 EQE remains 32.5% spectrum almost unchanged.
Language: Английский
Citations
9
Chemical Communications, Journal Year: 2024, Volume and Issue: 60(53), P. 6728 - 6740
Published: Jan. 1, 2024
This review overviews recent research on circularly polarized luminescence from planar chiral organic compounds, focusing their synthetic strategies, properties and applications.
Language: Английский
Citations
7
Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(20)
Published: March 27, 2024
Abstract The development of efficient, bright, and stable narrowband light‐emitting electrochemical cells (LECs) has remained a challenge. Here, intrinsically ionic multi‐resonance thermally activated delayed fluorescence (MR‐TADF) emitters are reported as guest for LECs, which developed by attaching an imidazolium cation onto typical MR‐TADF emitter. In solution, the show green–blue emission peaked at 486−497 nm with small full widths half‐maximum (FWHMs) 24−26 nm. doped films, they high luminescent efficiencies ≈90%. LECs using exciplex host 494−503 FWHMs 31−34 nm, afford external quantum (EQEs) up to 10% under constant‐voltage driving. With TADF small‐molecule hosts, EQEs 13.0% driving, is highest among all peak brightness/EQE/half lifetime 780 cd m −2 /5.6%/62.2 h constant‐current A long half‐lifetime ≈630 further been achieved 136 . work demonstrates great potential use hosts develop LECs.
Language: Английский
Citations
6
Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 493, P. 152857 - 152857
Published: June 5, 2024
Language: Английский
Citations
4
Journal of Semiconductors, Journal Year: 2024, Volume and Issue: 45(8), P. 082402 - 082402
Published: Aug. 1, 2024
Abstract Boron−nitrogen doped multiple resonance (BN-MR) emitters, characterized by B−N covalent bonds, offer distinctive advantages as pivotal building blocks for facile access to novel MR emitters featuring narrowband spectra and high efficiency. However, there remains a scarcity of exploration concerning synthetic methods structural derivations expand the library BN-MR emitters. Herein, we present synthesis emitter, t Cz[B−N]N, through one-pot borylation reaction directed amine group, achieving an impressive yield 94%. The emitter is decorated incorporating two 3,6-di-t-butylcarbazole ( Cz) units into bond parent molecule via para -C−π−D -N−π−D conjugations. This peripheral decoration strategy enhances reverse intersystem crossing process shifts emission band towards pure green region, peaking at 526 nm with full-width half maximum (FWHM) 41 nm. Consequently, organic light emitting diodes (OLEDs) employing this achieved external quantum efficiency (EQE max ) value 27.7%, minimal roll-off. Even practical luminance 1000 cd∙m −2 , device maintains EQE 24.6%.
Language: Английский
Citations
4