Long Persistent Luminescence from Metal–Organic Compounds: State of the Art

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(19)

Published: March 18, 2023

Abstract The excited‐state tuning of luminescent metal–organic compounds has made great progress in the fields optical imaging, photocatalysis, photodynamic therapy, light‐emitting devices, sensors, and so on. Although with high luminescence efficiency can be realized via enhanced molecular rigidity heavy‐atom effect, their corresponding lifetimes are still limited on order a nanosecond to millisecond, owing inherent competition between luminous lifetime. Therefore, advanced applications (i.e., persistent afterglow information security, anti‐counterfeiting, smart materials, among others) related long (LPL, typically lifetime larger than millisecond) seriously hindered. This review gives timely systematic summary for realizing room‐temperature phosphorescence (RTP)‐type thermally activated delayed fluorescence (TADF)‐type LPL during last few years. Particularly, based perspectives time, space, energy dimensions, fundamental materials design coordination assembly systematically described first time. Moreover, internal external factors influencing properties terms efficiency, lifetime, color illustrated. Last but not least, challenges also discussed developing from compounds.

Language: Английский

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

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(28)

Published: April 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.

Language: Английский

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Stimulus-responsive polymer materials toward multi-mode and multi-level information anti-counterfeiting: recent advances and future challenges

Chemical Society Reviews, Journal Year: 2023, Volume and Issue: 53(2), P. 606 - 623

Published: Dec. 15, 2023

This review highlights the recent advances and discusses challenges perspectives of stimulus-responsive polymer (SRP)-based information-storage materials, which exhibit multi-mode or multi-level anti-counterfeiting performance.

Language: Английский

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Phosphorescence resonance energy transfer from purely organic supramolecular assembly

Nature Reviews Chemistry, Journal Year: 2023, Volume and Issue: 7(12), P. 854 - 874

Published: Nov. 22, 2023

Language: Английский

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Single‐Component 0D Metal–Organic Halides with Color‐Variable Long‐Afterglow toward Multi‐Level Information Security and White‐Light LED

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(18)

Published: Feb. 7, 2023

Abstract The optical anti‐counterfeiting science and technology are currently restricted by the limited information loading capacity, thus development of multi‐level high‐security systems is urgently needed but still challenging. Herein, design strategies (including ASCII/5D codes dynamic storage) reported incorporation abundant multi‐central luminescence time‐resolved, excitation‐dependent ultralong phosphorescence. Self‐assembly new single‐component 0D organic–inorganic metal halides (OIMHs) facilely achieved, which exhibit divisible all‐phosphorescence, thermally activated delayed fluorescence, single‐molecule white‐light emission, as proved experiments theoretical calculations. Interestingly, combing advantages both inorganic cluster π‐conjugation in OIMHs, time‐dependent afterglow affords color‐variable emission a wide wavelength range larger than 100 nm, providing extra color‐time dimensions for encryption compared to traditional single‐color fluorescent anti‐counterfeiting. Moreover, white light‐emitting diode device further developed show high lighting ability OIMH. Therefore, this study paves an effective way fabricate cluster‐based hybrids equipping different emitters confer diverse photoluminescence manners satisfy down‐to‐earth application requirements.

Language: Английский

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Time‐dependent Phosphorescence Color of Carbon Dots in Binary Salt Matrices through Activations by Structural Confinement and Defects for Dynamic Information Encryption

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(23)

Published: April 6, 2023

The emergence of time-dependent phosphorescence color (TDPC) materials has taken information encryption to high-security levels. However, due the only path exciton transfer, it is almost impossible obtain TDPC for chromophores with a single emission center. Theoretically, in inorganic-organic composites, transfer organic depends on inorganic structure. Here, we assign two structural effects NaCl by metal (Mg2+ or Ca2+ Ba2+ ) doping, which triggers performance carbon dots (CDs) resulting material used multi-level dynamic 3D coding achieve encryption. confinement activates green CDs; while defect tunneling-related yellow phosphorescence. Such simply doped matrices can be synthesized using periodic table cations, endowing tremendous control over properties. This demonstration extends design view luminescent materials.

Language: Английский

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Light‐Induced Electron Transfer Toward On/Off Room Temperature Phosphorescence in Two Photochromic Coordination Polymers

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(47)

Published: Aug. 4, 2023

Abstract Photoswitchable room temperature phosphorescence (RTP) materials are of great interest due to their potential applications in optical devices and switches. Herein, two Zn‐based coordination polymers (CPs) (H 3 ‐TPB)·[Zn 6 (H‐HEDP)(HEDP) 2 O) ]·5H O (complex 1; HEDP = hydroxyethylidene diphosphonate; TPB 1,3,5‐tris(4‐pyridyl)benzene) (H‐TPB)·[Zn (H‐HEDP)(HEDP)(H O)]·2H 2) with distinguishable photochromism tunable RTP synthesized involving photoactive molecules different packing modes. Complex 1 exhibits bidirectionally on/off regulation via on‐switch excitation 250−330 nm light off‐switch 350−380 nm, the “turn‐on” behavior can be attributed advance Förster resonance energy transfer‐assisted intersystem crossing (ISC) process while “turn‐off” transformation from H ‐TPB cations · radicals. photoswitchable accompanied reversible by leveraging self‐absorption emission. Two demos based on above compounds further applied demonstrate application information recording encryption fields. This work supplies a strategy toward design switchable systems using electron transfer photochromism, shedding broadening frontiers photoresponsive materials.

Language: Английский

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Enabling Highly Robust Full‐Color Ultralong Room‐Temperature Phosphorescence and Stable White Organic Afterglow from Polycyclic Aromatic Hydrocarbons

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(10)

Published: Jan. 19, 2024

Abstract In this work, full‐color and stable white organic afterglow materials with outstanding water, solvents, temperature resistances have been developed for the first time by embedding selected polycyclic aromatic hydrocarbons into melamine‐formaldehyde polymer via solution polymerization. The quantum yields lifetimes of resulting films were up to 22.7 % 4.83 s, respectively, under ambient conditions. For coronene‐doped sample, its color could be linearly tuned between yellow blue adjusting temperature, it still emit an intense a lifetime 0.68 s at 440 K. Moreover, showed bright 370 K 2.80 maintained excellent performance after soaking in water solvents more than 150 days. addition, application potential information encryption anti‐counterfeiting was also demonstrated.

Language: Английский

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Stable and ultralong room-temperature phosphorescent copolymers with excellent adhesion, resistance, and toughness

Science Advances, Journal Year: 2024, Volume and Issue: 10(10)

Published: March 8, 2024

Developing stable room-temperature phosphorescence (RTP) emission without being affected by moisture and mechanical force remains a great challenge for purely organic systems, due to their triplet states sensitive the infinitesimal motion of phosphors oxygen quencher. We report kind highly robust phosphorescent doping rigid phosphor into copolymer (polyvinyl butyral resin) matrix with balance mutually exclusive features, including rigidly hydrophilic hydrogen bond network elastically hydrophobic constituent. Impressively, these RTP polymeric films have superior adhesive ability on various surfaces showed reversible photoactivated lifetimes up 5.82 seconds, which can be used as in situ modulated anticounterfeit labels. They maintain bright afterglow over 25.0 seconds under practical conditions, such storage refrigerators, soaking natural water month, or even subjected strong collisions impacts. These findings provide deep insights developing ultralong materials desirable comprehensive performance.

Language: Английский

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Viscoelasticity‐Controlled Relaxation in Wrinkling Surface for Multistage Time‐Resolved Optical Information Encryption

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(23)

Published: March 6, 2024

Abstract As counterfeit techniques continue to evolve, ensuring the security of conventional “static” encryption methods becomes increasingly challenging. Here, viscoelasticity‐controlled relaxation is introduced for first time in a bilayer wrinkling system by regulating density hydrogen bond networks polymer construct “dynamic” material. The surface can manipulate light during dynamic process, exhibiting three stages with frosted glass, structural color, and mirror reflection. By viscoelasticity skin layer through UV irradiation, wavelength rate wrinkles be controlled. result, anti‐counterfeiting patterns time‐resolved multistage information are achieved. Crucially, material developed as an label packing boxes daily applications, allowing encrypted activated manually identified naked eyes, surpassing existing materials utilization potential. Besides, extended various interaction networks, demonstrating versatility strategy. This work not only provides additional dimension practical use, but also offers theoretical guidance development advanced optical smart display future.

Language: Английский

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