Synthesis and Characterization of Chiral Luminescent Materials Based on Binaphthol Scaffolds

Acta Chimica Sinica, Год журнала: 2025, Номер 83(1), С. 10 - 10

Опубликована: Янв. 1, 2025

Язык: Английский

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Polycyclization decorated organoboron emitters with hetero[8]helicenes electronic structure for highly‐efficient and stable narrowband circularly polarized electroluminescence

InfoMat, Год журнала: 2025, Номер unknown

Опубликована: Янв. 27, 2025

Abstract Multiresonance organoboron helicenes are promising narrowband circularly polarized luminescence (CPL) emitters, which, however, still face formidable challenges to balance a large dissymmetry factor ( g lum ) and high efficiency. Here, two pairs of enantiomers P/M ‐BN[8]H‐ICz ‐BN[8]H‐BO) with the same hetero[8]helicene geometric structures developed through polycyclization decoration. We find that it is helicity helicene electronic rather than geometrical one determines molecular property as larger could enhance electron‐orbital coupling structure. Therefore, ‐BN[8]H‐BO who possesses structure realizes nearly one‐order‐of‐magnitude higher (+2.75/−2.52 × 10 −3 photoluminescence quantum yield (PLQY) 99% compared bearing only hetero[6]helicene distribution +2.41/−2.37 −4 PLQY 95%). Moreover, BN[8]H‐BO exhibits green emission peaking at 538 nm full‐width half‐maxima merely 34 nm, narrower most multiresonance CPL helicenes. The corresponding organic light‐emitting diodes simultaneously realize external efficiency 31.7%, an electroluminescence factors EL +5.23/−5.07 , extremely long LT95 (time 95% initial luminance) over 731 h luminance 1000 cd m – 2 . image

Язык: Английский

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Amplified circularly polarized luminescence in assembly of terpyridine-ZnII and GTP induced by silver(I) ion

Science China Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Март 10, 2025

Язык: Английский

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Synthesis and circularly polarized luminescence properties of sulfur-centered chiral MR-TADF materials

Science China Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Март 25, 2025

Язык: Английский

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Efficient Circularly Polarized Electroluminescence Based on Chiral MR‐TADF Materials with Innovative Planar Structure Design Strategy

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 15, 2025

Abstract Chiral multiple resonance thermally activated delayed fluorescence (CP‐MR‐TADF) emitters have obtained attention due to their potential in organic light‐emitting diodes (CP‐OLEDs) with circularly polarized luminescence (CPL). Moreover, the devices always rely on doping concentration aggregation‐caused quenching of CP‐MR‐TADF emitters. Herein, three MR‐TADF materials ( p ‐ICz‐N‐BN , m and ‐prCz‐N‐BN ) are presented by face‐to‐face arrangement indolo[3,2,1‐ jk ]carbazole fluorophore sterically naphthalene bridge, showing emissions peaking at 496–499 nm full‐width half‐maximum values 23–26 photoluminescence quantum yields 91%–98%, respectively. Because asymmetric steric hindrance structures, both separated into innovative planar enantiomers, exhibiting symmetric CPL spectra dissymmetry factors (| g PL |) up 1.1 × 10 −3 2.3 toluene films, Furthermore, OLEDs illustrate maximum external efficiencies 31.5%, 33.7%, 32.4%, respectively, still remain high levels even 20 wt.% almost unchanged emission spectra. Additionally, CP‐OLEDs R / S ‐ display | EL 1.88 1.89

Язык: Английский

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Spirobifluorene-fused strategy enables pure-green multiple resonance emitters with low efficiency roll-off

Materials Horizons, Год журнала: 2024, Номер 11(19), С. 4674 - 4680

Опубликована: Янв. 1, 2024

The spiroannulation of multiple resonance core skeleton gives rise to pure-green emitters and superior electroluminescence performance with low efficiency roll-off.

Язык: Английский

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Helically chiral multiresonant thermally activated delayed fluorescent emitters and their use in hyperfluorescent organic light-emitting diodes

Chemical Science, Год журнала: 2024, Номер 15(41), С. 16917 - 16927

Опубликована: Янв. 1, 2024

Helically chiral MR-TADF compounds tBuPh-BN and DPA-tBuPh-BN show narrowband circularly polarized luminescence that translates into high-performance hyperfluorescent organic light-emitting diodes.

Язык: Английский

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Multistate circularly polarized luminescence switches based on dual stimuli-responsive chiral [2]rotaxanes

Science China Chemistry, Год журнала: 2024, Номер 67(12), С. 4202 - 4211

Опубликована: Авг. 15, 2024

Язык: Английский

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Spiral Polycyclic Aromatic Hydrocarbons Embedded in the B/N Center for Constructing Highly Efficient Multiple Resonance TADF Emitters

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Сен. 26, 2024

Introducing spiral polycyclic aromatic hydrocarbons (PAHs) in multiple resonances thermally activated delayed fluorescence (MR-TADF) emitters to achieve small FWHM values and high efficiency remains a formidable challenge. This research departs from the conventional molecular design strategy that utilizes PAHs solely as side chains, terminal groups, or linkage units. Instead, we integrate rigid 9,9'-spirobi[fluorene] (SF) unit fully partially into boron/ nitrogen MR (B/N-MR) emitting core successfully developed range of brand-new proof-of-concept isomerized MR-TADF emitters, SF-BN1, SF-BN2, SF-BN3, SF-BN4. Remarkably, these novel exhibit exceptionally narrow full-width at half-maximum (FWHM) 15～21 nm dilute toluene solutions photoluminescence quantum yields (PLQYs) up 90% doped films. The corresponding organic light-emitting diode (OLED) based on SF-BN1 achieved external (EQE) 29.0%, with CIE coordinates (0.13, 0.08), closely aligning BT.2020 blue emission standard. Sky-blue OLEDs SF-BN3 can EQE 29.8%, an highly value 18 nm; hyperfluorescent improved 35.5%. Moreover, elucidated subtlevariations connectivity chemical functional groups within well polar environment doping concentrations OLEDs, which significantly impact optical electroluminescent properties isomers. unveils new opportunities for exploration potential luminescent materials suitable ultra-high-definition (UHD) display technologies.

Язык: Английский

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Enhanced Chiroptical Activity for Narrow Deep-Blue Emission in Axial Chiral Frameworks via Three-Dimensional Interlocking

Chemical Science, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

The advancement of desirable circularly polarized luminescence (CPL) emitters is predominantly constrained by the effective regulation magnetic and electric transition vectors, particularly within deep-blue spectral domain. Herein, we present four pairs novel chiral with systematically varied molecular rigidity, symmetry, centers to elucidate intrinsic coupling key parameters influencing their chiroptical properties. Notably, incorporation appropriate intramolecular 3D-interlocking a natural binaphthyl chirality skeleton offers an approach achieving both significantly narrowed full width at half maximum (FWHM, as low 18 nm) substantially enhanced activity (luminous dissymmetry factor,

Язык: Английский

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