Dual-Ring-Locking Strategy Enables Persistent Blue Room Temperature Phosphorescence in Benzo[b]phospholiums

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 18, 2025

Commercial phosphines and phosphoniums were commonly reported to have unstable triplet dissipation because of the flexible C-P pyramidal geometry, resulting in extremely weak or no phosphorescence. To boost populations stability by restricting molecular motion rebuilding electronic structures, we that dual-ring-locking strategy could enable elevated intersystem crossing (ISC) radiation for rigid benzo[b]phospholium configuration, exhibiting intense persistent room temperature phosphorescence (RTP) poly(vinyl alcohol) (PVA). Among them, dual-ring-locked [P1]+[Cl]- showed near-ultraviolet fluorescence maximized at 400 nm dichloromethane blue RTP emission 453 (Φphos ≈ 12.4%, τphos > 1200 ms) PVA matrix. In contrast, [P2]+[Cl]- possessed a single ring-locked nucleus had red-shifted < 1.8%, = 74.2 ms). Time-dependent density functional theory (TD-DFT) disclosed improved spin-flipping benefited from integrated π-π*/n-π* transition, rational split energy, excited states. The impressive OU-RTP duration function as an afterglow pattern optical encryption emitting layer light-emitting diode (LED) applications.

Language: Английский

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Narrowband Emissive Solution‐Processed Polymer Organic Light‐Emitting Diodes with External Quantum Efficiency Above 30%

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 27, 2025

Abstract Achieving both high‐efficiency and narrowband emission in thermally activated delayed fluorescence (TADF) polymers remains a formidable challenge. In this work, proof of concept for narrowband‐emissive TADF with partially conjugated structure is proposed by embedding silicon─carbon σ‐bond saturated spacer between the multiresonance (MR) unit polycarbazole backbone. A series PSix ( x = 1, 3, 6) then prepared characterized. All show full width at half maximum (FWHM) values 28–30 nm toluene solution. Impressively, polymer PSi3 has highest photoluminescence quantum yield, reaching 97%, doped films due to efficient reverse intersystem crossing process. The solution‐processed devices based on exhibit best performance external efficiency EQE max ) 28.8% an FWHM 42 nm. By employing molecule 5Cz‐TRZ as sensitizer, enhanced device 30.2% achieved, which first tier among MR‐TADF reported date. This work provides effective strategy achieving highly controlling chromophore

Language: Английский

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Highly Efficient Purely Organic Room‐Temperature Phosphorescence of Phenoselenazine Derivatives via a Synergistic Strategy of Intramolecular Locking and Steric Donor Substituent

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Abstract Pure organic room‐temperature phosphorescent (RTP) materials have received significant attention recently because of their wide potential applications. However, RTP that lack host–guest interactions or hydrogen and ionic bonds typically exhibit limited phosphorescence quantum yields in amorphous films, owing to severe nonradiative decay transition‐forbidden triplet excitons caused by molecular rotations vibrations. Herein, a design strategy an intramolecular‐locking core (FPSeZPh) integrated with steric donor substituents (FPSeZPh‐TMCz) is proposed modify the parent phenoselenazine molecule (PSeZPh), which can not only restrict intramolecular motions suppress path excited states, but also effectively accelerate radiative process simultaneously. Benefiting from these synergistic effects, bright emission observed for both FPSeZPh FPSeZPh‐TMCz efficiencies up 83.3% doped polystyrene among best results emitters reported so far films. Moreover, are applied construct film sensors trace oxygen detection high quenching constants 5.5 × 10 −4 ppm −1 . These findings provide valuable insights into highly efficient metal‐free offer broad opportunities optical optoelectronic

Language: Английский

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Progress in Polymer‐Based Pure Organic Room Temperature Phosphorescent Materials

Chemistry - An Asian Journal, Journal Year: 2025, Volume and Issue: unknown

Published: April 23, 2025

Abstract To date, organic room‐temperature phosphorescent (RTP) materials have received much attention due to their long lifetime and large Stokes shift, been widely used in anti‐counterfeiting encryption, bio‐imaging, sensing monitoring. Researchers a variety of approaches construct ultra‐long, efficient RTP materials, with the confinement chromophores polymers being favored improve performance. The polymer entanglement structure restricts vibration rotation chromophore, which successfully suppresses non‐radiative excitation triplet exciton protects from external environment (oxygen, water), is conducive realization ultra‐long bright emission, makes material easy process, broadens application range material. This review summarizes recent advances study polymeric underlying mechanisms design strategies, discusses properties amorphous crystalline respectively, as well latest applications polymers, finally challenges for development outlook future.

Language: Английский

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Recent advances in dopant–matrix afterglow systems: high-performance organic afterglow materials and the critical role of organic matrices in materials fabrication

Physical Chemistry Chemical Physics, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Recent advances in organic afterglow materials, especially dopant–matrix systems, highlight the synergy between luminophore design and matrix function, offering new opportunities for persistent luminescence future high-value applications.

Language: Английский

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Modulating Room‐Temperature Phosphorescence of Phenothiazine Dioxide via External Heavy Atoms

Angewandte Chemie, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 18, 2024

Abstract Developing pure organic materials with ultralong lifetimes and balanced quantum efficiency is attractive but challenging. In this study, we propose a novel strategy to investigate external heavy atoms by linking molecular emitters halogen through flexible alkyl chain. X‐ray crystal analysis clearly reveal the C−X‐π interactions, which can be tuned donors, as well distance geometry between them. Impressively, DOPTZ‐C3Cl featuring chloride atom donor, exhibits long phosphorescence lifetime of 1351 ms yield 10.1 %. We also first demonstrate that Cl induce more positive effect than heavier halogens (Br I) on prolonging lifetime. envisage present study will expedite new design manipulate room temperature via effect, highlight special C−Cl⋅⋅⋅π interaction for development phosphorescent materials.

Language: Английский

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Modulating Room‐Temperature Phosphorescence of Phenothiazine Dioxide via External Heavy Atoms

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 18, 2024

Developing pure organic materials with ultralong lifetimes and balanced quantum efficiency is attractive but challenging. In this study, we propose a novel strategy to investigate external heavy atoms by linking molecular emitters halogen through flexible alkyl chain. X-ray crystal analysis clearly reveal the C-X-π interactions, which can be tuned donors, as well distance geometry between them. Impressively, DOPTZ-C3Cl featuring chloride atom donor, exhibits long phosphorescence lifetime of 1351 ms yield 10.1 %. We also first demonstrate that Cl induce more positive effect than heavier halogens (Br I) on prolonging lifetime. envisage present study will expedite new design manipulate room temperature via effect, highlight special C-Cl⋅⋅⋅π interaction for development phosphorescent materials.

Language: Английский

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