Recent advances in the design of afterglow materials: mechanisms, structural regulation strategies and applications

Chemical Society Reviews, Год журнала: 2023, Номер 52(22), С. 8005 - 8058

Опубликована: Янв. 1, 2023

Afterglow materials have attracted widespread attention owing to their distinctive and long-lived optical emission properties which create exciting opportunities in various fields.

Язык: Английский

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Achieving Color‐Tunable and Time‐Dependent Organic Long Persistent Luminescence via Phosphorescence Energy Transfer for Advanced Anti‐Counterfeiting

Advanced Functional Materials, Год журнала: 2022, Номер 33(1)

Опубликована: Окт. 30, 2022

Abstract Organic ultralong room‐temperature phosphorescence (RTP) materials have promising applications in anti‐counterfeiting. To improve the encryption level, exploration of organic with tunable solid‐state long persistent luminescence is urgent need. Herein, a series RTP polymeric systems are prepared by doping versatile indolocarbazole isomers into poly(vinyl alcohol) (PVA) matrix. Notably, film 11,12‐ICz@PVA exhibits excellent property an lifetime 2.04 s and high quantum yield 44.1%. Theoretical calculations reveal that this can be attributed to strong electrostatic attraction resulting from synergistic double hydrogen‐bond between isomer 11,12‐ICz PVA More impressively, color‐tunable time‐dependent successfully achieved through efficient energy transfer blue emissions commercially available fluorescent dyes emission colors ranging green red doped Besides, diversified patterns fabricated demonstrate these water‐soluble advanced anti‐counterfeiting technology.

Язык: Английский

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Achieving Tunable Organic Afterglow and UV‐Irradiation‐Responsive Ultralong Room‐Temperature Phosphorescence from Pyridine‐Substituted Triphenylamine Derivatives

Advanced Materials, Год журнала: 2023, Номер 35(28)

Опубликована: Апрель 7, 2023

Amorphous polymers with ultralong room-temperature phosphorescence (RTP) are highly promising for various applications. Particularly, polymer-based RTP materials multiple functions such as color-tunability or stimulus-response desirable multilevel anti-counterfeiting but rarely reported. Herein, a facile strategy is presented to achieve series of lifetime, multicolor afterglow, and reversible response UV irradiation by simply embedding pyridine-substituted triphenylamine derivatives into the polymer matrix poly(vinyl alcohol) (PVA) poly(methyl methacrylate) (PMMA), respectively. Notably, pyridine group capabilities promoting intersystem crossing forming hydrogen-bonding interactions essential triggering from doping PVA system, among which film TPA-2Py@PVA exhibits excellent property an lifetime 798.4 ms high quantum yield 15.2%. By further co-doping commercially available fluorescent dye, afterglow obtained via energy transfer. Meanwhile, doped PMMA system photoactivated properties under continuous irradiation. Finally, potential applications these systems in multidimensional demonstrated.

Язык: Английский

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A Molecular Engineering Strategy for Achieving Blue Phosphorescent Carbon Dots with Outstanding Efficiency above 50%

Advanced Materials, Год журнала: 2022, Номер 35(6)

Опубликована: Ноя. 22, 2022

Highly efficient emission has been a long-lasting pursuit for carbon dots (CDs) owing to their enormous potential in optoelectronic applications. Nevertheless, room-temperature phosphorescence (RTP) performance still largely lags behind outstanding fluorescence emission, especially the blue spectral region. Herein, high-efficiency RTP CDs have designed and constructed via simple molecular engineering strategy, enabling with an unprecedented quantum efficiency of 50.17% long lifetime 2.03 s. This treating route facilitates formation high-density (n, π*) configurations CD π-π conjugate system through introduction abundant functional groups, which can evoke strong spin-orbit coupling further promote intersystem crossing from singlet triplet excited states radiative recombination ground state. With phosphorescent as donors, green, red, white afterglow composites are successfully fabricated effective Förster resonance energy transfer. Importantly, color temperature be widely facilely tuned cool pure warm white. Moreover, advanced information encryption, light illumination, afterglow/dynamic visual display demonstrated when using these multicolor-emitting CD-based systems.

Язык: Английский

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Thermally Enhanced and Long Lifetime Red TADF Carbon Dots via Multi‐Confinement and Phosphorescence Assisted Energy Transfer

Advanced Materials, Год журнала: 2023, Номер 35(20)

Опубликована: Март 9, 2023

Thermally activated delayed fluorescence (TADF) materials, which can harvest both singlet and triplet excitons for high-efficiency emission, have attracted widespread concern their enormous applications. Nevertheless, luminescence thermal quenching severely limits the efficiency operating stability in TADF materials devices at high temperature. Herein, a surface engineering strategy is adopted to obtain unique carbon dots (CDs)-based thermally enhanced with ≈250% enhancement from 273 343 K via incorporating seed CDs into ionic crystal network. The rigid network simultaneously boost reverse intersystem crossing process enhancing spin-orbit coupling between states suppressing non-radiative transition rate, contributing character. Benefiting efficient energy transfer of phosphorescence center CDs, emission ≈600 nm displays long lifetime up 109.6 ms, outperforming other red organic materials. Thanks variable decay rates centers, time temperature-dependent color has been first realized CDs-based time-/temperature-dependent one material system offer new opportunities information protection processing.

Язык: Английский

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Phosphorescence resonance energy transfer from purely organic supramolecular assembly

Nature Reviews Chemistry, Год журнала: 2023, Номер 7(12), С. 854 - 874

Опубликована: Ноя. 22, 2023

Язык: Английский

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Conformation-dependent dynamic organic phosphorescence through thermal energy driven molecular rotations

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Фев. 6, 2023

Organic room-temperature phosphorescent (RTP) materials exhibiting reversible changes in optical properties upon exposure to external stimuli have shown great potential diverse optoelectronic fields. Particularly, dynamic manipulation of response behaviors for such is fundamental significance, but it remains a formidable challenge. Herein, series RTP polymers were prepared by incorporating rotors into polymer backbone, and these show color-tunable persistent luminescence excitation at different wavelengths. Experimental results theoretical calculations revealed that the various molecular conformations monomers are responsible wavelength-dependent (Ex-De) behavior. Impressively, after gaining insights underlying mechanism, control Ex-De behavior was achieved through thermal energy driven rotations monomers. Eventually, we demonstrate practical applications amorphous anti-counterfeiting areas. These findings open new opportunities smart-responsive rather than conventional covalent modification method.

Язык: Английский

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Multicolor hyperafterglow from isolated fluorescence chromophores

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Янв. 30, 2023

High-efficiency narrowband emission is always in the central role of organic optoelectronic display applications. However, development afterglow materials with sufficient color purity and high quantum efficiency for hyperafterglow still great challenging due to large structural relaxation severe non-radiative decay triplet excitons. Here we demonstrate a simple yet efficient strategy achieve through sensitizing stabilizing isolated fluorescence chromophores by integrating multi-resonance into host single-component copolymer. Bright multicolor maximum photoluminescent efficiencies 88.9%, minimum full-width at half-maximums (FWHMs) 38 nm ultralong lifetimes 1.64 s under ambient conditions are achieved. With this facilely designed polymer, large-area panel was fabricated. By virtue narrow band luminescent efficiency, presents significant technological advance developing highly extends domain new

Язык: Английский

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Rational Design of Covalent Bond Engineered Encapsulation Structure toward Efficient, Long‐Lived Multicolored Phosphorescent Carbon Dots

Small, Год журнала: 2022, Номер 19(31)

Опубликована: Ноя. 27, 2022

Multicolored phosphorescent materials based on carbon dots (CDs) constructed using the same or similar precursors with long lifetimes are conducive to their wide range of practical applications due developed compatibility. Herein, a universal method is prepare long-lived multicolored CD-based composites for which heavy-metal doping not required. The CDs encapsulated in silica via silane hydrolysis, forms many covalent SiOC and SiC bonds; hence, vibrations rotations luminescent centers CD surfaces hindered. transformation more rigid moiety occurs during high-temperature calcination. Furthermore, calcination, collapses, resulting tightly CDs. synergistic effect these two calcination phenomena produces blue, green, yellow, red phosphorescence, at wavelengths spanning 465 680 nm up 2.11 s. Taking advantage superior phosphorescence performances, successfully applied 3D multichannel information storage encryption.

Язык: Английский

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Narrowband Organic Afterglow via Phosphorescence Förster Resonance Energy Transfer for Multifunctional Applications

Advanced Materials, Год журнала: 2023, Номер 35(36)

Опубликована: Июнь 30, 2023

Achieving multicolor organic afterglow materials with narrowband emission and high color purity is important in various optoelectronic fields but remains a great challenge. Here, an efficient strategy presented to obtain via Förster resonance energy transfer from long-lived phosphorescence donors fluorescence acceptors polyvinyl alcohol matrix. The resulting exhibit full width at half maximum (FWHM) as small 23 nm the longest lifetime of 721.22 ms. Meanwhile, by pairing appropriate acceptors, ranging green red photoluminescence quantum yield 67.1% are achieved. Moreover, given their long luminescence lifetime, purity, flexibility, potential applications demonstrated high-resolution displays dynamic quick information identification low-light conditions. This work provides facile approach for developing well expands features afterglow.

Язык: Английский

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