Recent Advances of Pure Organic Room Temperature Phosphorescence Based on Functional Polymers

Accounts of Materials Research, Год журнала: 2023, Номер 4(10), С. 827 - 838

Опубликована: Авг. 26, 2023

ConspectusThe phosphorescence is produced by the radiative transition of excited triplet state which generated intersystem crossing (ISC) from singlet state. Compared with fluorescence, it has a longer luminescence lifetime and larger Stokes shift, so phosphorescent materials have great application value in fields such as displays, anticounterfeiting, imaging. But due to low ISC rate organic molecules, slow state, large nonradiative energy loss caused molecular vibration, pure room temperature (RTP) usually difficult obtain. Among most widely used strategies including crystal assembly, polymerization, host–guest encapsulation, polymerization strategy based on rigid polymers achieved success widespread attention their easy processing excellent performance.The main function fix luminophore into matrix suppress transitions oxygen quenching. That is, provide microenvironment necessary for RTP, although some are flexible stretchable. Conventional limited interaction luminophores do not promoting states. Therefore, high RTP quantum yield depends more structural design luminophores. By modification structure, functionalized can be endowed ability regulate levels luminophores, enhance ISC, increase RTP. The selection also enriches diverse properties materials.This Account summarizes latest research progress field polymer-based enhancement polymers. Luminophores construct systems doping, covalent linking, or supramolecular interactions PAA, PMMA, PVA, PAM. To further strengthen polymer rigidity, secondary been successfully employed synergistically nonradioactivation performance, hydrogen bonding bridges, cross-linking. no suppressing but includes enhancing states generating special phenomena. A few specially designed utilize external heavy atom effects, dipole–dipole interactions, electrostatic diffusion promote rate. Due diversification functionalization polymers, were developed various phenomena photoactivation, excitation wavelength dependence, photochromism, circularly polarized stimulus-response. We hope summarized functions development trends helpful guidance designing high-performance materials.

Язык: Английский

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A Facile Strategy for Achieving Polymeric Afterglow Materials with Wide Color‐Tunability and Persistent Near‐Infrared Luminescence

Advanced Functional Materials, Год журнала: 2023, Номер 34(12)

Опубликована: Дек. 10, 2023

Abstract Polymer‐based room‐temperature phosphorescence (RTP) materials show promising applications in anti‐counterfeiting. To further realize multiscale and/or multimodal anti‐counterfeiting, it is highly desirable to develop polymeric afterglow with multiple security features. Herein, a facile strategy presented endow ultralong lifetime, wide color‐tunability, persistent near‐infrared (NIR) luminescence, and good water solubility via constructing non‐traditional resonance energy transfer (PRET) two‐step sequential systems. Specifically, the 1‐bromocarbazole derivatives blue‐color RTP property act as donor while traditional dyes red/NIR luminescence acceptor. By simply regulating doping composition concentration of these systems, multicolor organic covering from visible NIR region successfully realized. Notably, compared single‐step PRET, has unique advantages higher efficiency triplet excitons initial donor, wider range color‐tunability mediated by intermediary acceptor, enhanced delayed fluorescence final Finally, water‐soluble great potential advanced anti‐counterfeiting information technologies.

Язык: Английский

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Thermal Activated Reversible Phosphorescence Behavior of Solid Supramolecule Mediated by β‐Cyclodextrin

Advanced Functional Materials, Год журнала: 2024, Номер 34(34)

Опубликована: Март 25, 2024

Abstract A reversible solid thermally responsive deep‐blue pure organic room temperature phosphorescent material is constructed by terephthalic acid (PPA), β ‐cyclodextrin ( ‐CD), and poly(vinylalcohol) (PVA). Attributed to the host‐guest interaction of ‐CD isolate PPA chromophore rigid environment offered hydrogen bonds suppress nonradiative decays, amorphous supramolecular assembly PPA‐CD/PVA not only induces a phosphorescence at 410 nm that differing from traditional derivatives with green emission but also enhances quantum yield up 30.52%. Uncommonly, this film exhibits unique thermal stimulation response property blue cyan color transitions because heating can destroy binding behavior between PPA, resulting in redshift stacking. Additionally, incorporation Rhodamine B (RhB) or Sulforhodamine 101 (SR101) into film, color‐tunable white, yellow, red relying on realized through triplet‐to‐singlet Förster resonance energy transfer (TS‐FRET) platform. These thermochromic materials are successfully applied multilevel anticounterfeiting information encryption, which provides new simple approach for temperature‐responsive TS‐FRET multicolor luminescence materials.

Язык: Английский

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Achieving pure room temperature phosphorescence (RTP) in phenoselenazine-based organic emitters through synergism among heavy atom effect, enhanced n → π* transitions and magnified electron coupling by the A–D–A molecular configuration

Chemical Science, Год журнала: 2024, Номер 15(24), С. 9112 - 9119

Опубликована: Янв. 1, 2024

Synergism among heavy atom effect, enhanced n → π* transitions and magnified electron coupling to promote pure RTP emission.

Язык: Английский

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Photoactivated Circularly Polarized Room‐Temperature Phosphorescence from Phenoselenazine Derivative and Its Application in Information Security^†

Chinese Journal of Chemistry, Год журнала: 2024, Номер unknown

Опубликована: Июнь 11, 2024

Comprehensive Summary Room‐temperature phosphorescence (RTP) materials have experienced rapid development due to their potential in organic light‐ emitting diode, information security, bioimaging, etc . However, the design of chiral phosphors with circularly polarized RTP (CPP) property remains a formidable challenge. Here, we introduce perturbation approach using combination binaphthol and phenoselenazine derivative achieve CPP. The photoactivated CPP polystyrene (PS) film demonstrates luminescence dissymmetry factor ( g lum ), emission efficiency, lifetime up 9.32 × 10 –3 , 27.0%, 40.0 ms, respectively. remarkable sensitivity PS oxygen temperature enables adjustable colors, ranging from green offwhite blue under varying conditions. doping systems, utilizing hosts triphenylphosphine 9‐phenylcarbazole, demonstrate an extended 85.9 ms exhibit persistent mechanoluminescence low pressure response threshold as 0.15 N. security provided by this material was attained via diverse colors afterglow generated distinct UV irradiation times host materials. Alternately, it can also be achieved observing different patterns R ‐ L ‐polarizer. research has presented reliable for producing high efficiency

Язык: Английский

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Thianthrene-Based Heavy Metal-Free Oxygen Analytes Exhibiting Room Temperature Phosphorescence and High Sensitivity for Low Oxygen Concentration

Sensors and Actuators B Chemical, Год журнала: 2025, Номер unknown, С. 137380 - 137380

Опубликована: Фев. 1, 2025

Язык: 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, Год журнала: 2025, Номер unknown

Опубликована: Апрель 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

Язык: Английский

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π-Conjugated polymers consisting of heavier group 13 elements

Polymer Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

π-Conjugated polymers containing heavier group 13 elements are emerging materials applicable to optoelectronic devices and inorganic synthesis. This review presents an overview of synthesis optical properties these polymers.

Язык: Английский

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Effects of Heavy p‐Block Elements on Photophysical Properties of π‐Conjugated Complexes and Organoelement Compounds

European Journal of Inorganic Chemistry, Год журнала: 2024, Номер 27(21)

Опубликована: Май 15, 2024

Abstract π‐Conjugated compounds exhibit remarkable photophysical properties, such as strong light absorption and emission, are applicable to organic devices, bioimaging, sensing systems. The introduction of p‐block elements into π‐conjugated systems is presumable a critical strategy for modulating their properties. Nevertheless, the type utilized has been limited second third‐period ones because it difficult construct electronic interactions between heavier atoms carbon‐based scaffolds. On other hand, recently suggested that able induce significant changes in optoelectronic properties thanks large size, high polarizability, heavy atom effect. Although there much room explore effects heavy‐atom substitution on physical conjugated systems, various characters have discovered. Hence, this review mainly focuses relationships types optical representative complexes organoelement compounds, particularly emission.

Язык: Английский

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Near-Infrared Room Temperature Phosphorescence from Single Polymers Containing Benzoselenadiazole Groups

ACS Applied Polymer Materials, Год журнала: 2024, Номер 6(8), С. 4896 - 4903

Опубликована: Апрель 11, 2024

Polymeric room temperature phosphorescence (RTP) materials have attracted increasing attention in advanced optoelectronic applications because they not only possess fantastic advantages of good flexibility and easy processing but can also be used as a rigid matrix to suppress nonradiative decay. However, limited by the energy gap law, it remains an enormous challenge achieve near-infrared (NIR) RTP from single polymer. Here, we demonstrate that couple polymers (UP2–1 UP2–100) containing benzo-2,1,3-selenadiazole ureidopyrimidinone (UPy) segments emit NIR (731–768 nm) spectral range with long lifetime 1.19 ms. Theoretical calculations illustrate emissions stem lower-lying T1 level monomer donor–acceptor structure electron-withdrawing acceptor, strong spin–orbital coupling between S1 Tn facilitates intersystem crossing process. Benefiting delayed emission characteristics, this emitter exhibit decent electroluminescence performance. This work paves avenue for design simple single-polymer system emission.

Язык: Английский

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