Evolution and fabrication of carbon dot-based room temperature phosphorescence materials

Chemical Science, Год журнала: 2023, Номер 14(14), С. 3705 - 3729

Опубликована: Янв. 1, 2023

Carbon dot-based room temperature phosphorescence materials are reported, mainly focusing on the outstanding contributions over years, emission, lifetime, preparation and application.

Язык: Английский

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Room Temperature Phosphorescence Carbon Dots: Preparations, Regulations, and Applications

Small, Год журнала: 2023, Номер 19(33)

Опубликована: Апрель 22, 2023

Abstract Room temperature phosphorescence (RTP) materials have drawn considerable attention by virtue of their outstanding features. Compared with organometallic complexes and pure organic compounds, carbon dots (CDs) emerged as a new type RTP materials, which show great advantages, such moderate reaction condition, low toxicity, cost, tunable optical properties. In this review, the important progress made in CDs is summarized, an emphasis on latest developments. The synthetic strategies will be comprehensively followed detailed introduction performance regulation potential applications anti‐counterfeiting, information encryption, sensing, light‐emitting diodes, biomedicine. Finally, remaining major challenges for are discussed opportunities future proposed.

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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Multiple Stimuli‐Response Polychromatic Carbon Dots for Advanced Information Encryption and Safety

Small, Год журнала: 2023, Номер 19(10)

Опубликована: Янв. 15, 2023

Abstract Optical information encryption and safety have aroused great attention since they are closely correlated to data protection safety. The development of multiple stimuli‐response optical materials for constructing large‐capacity is very important practical applications. Carbon dots (CDs) many gratifying merits, such as polychromatic emission, diverse luminous categories, stable physicochemical properties, considered one the most ideal candidates protection. Herein, carbon core, functional groups, solvents, other crucial factors reviewed outputting emission categories. In particular, substrate engineering strategies been emphasized their critical role in yielding excellent features High‐capacity by relying on rich properties CDs, categories fluorescence, afterglow, upconversion, well external‐stimuli‐assisted changes. Some perspectives preparing CDs further developing security proposed. This review provides a good reference manipulation next‐generation

Язык: Английский

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Long‐Lived Dynamic Room Temperature Phosphorescence from Carbon Dots Based Materials

Small, Год журнала: 2023, Номер 19(31)

Опубликована: Янв. 6, 2023

Abstract As a type of room temperature phosphorescence (RTP) material, carbon dots (CDs) always show short lifetime and low efficiency. To counter these disadvantages, several strategies, such as embedding in rigid matrix, introducing heteroatom, crosslink‐enhanced emission, etc., are well developed. Consequently, lots CDs‐based RTP materials obtained. Doping CDs into various matrix is the dominant method for preparation long‐lived so far. The desired CDs@matrix composites display outstanding performances. Meanwhile, matrix‐free carbonized polymer dots‐based also widely Amounts possessing ultra‐long lived, multiple colored, dynamic emission successfully Herein, recent progress achieved corresponding efficient strategies mechanisms summarized reviewed detail. Due to possess excellent chemical stability, photostability biological toxicity, they exhibit great application potential fields anti‐counterfeiting, data encryption, monitoring. introduced this review. promising functional development long wavelength emitting with still challengeable, especially red near‐infrared materials.

Язык: Английский

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Colorful Triplet Excitons in Carbon Nanodots for Time Delay Lighting

Advanced Materials, Год журнала: 2023, Номер 35(21)

Опубликована: Фев. 25, 2023

Time delay lighting offers an added period of buffer illumination for human eyes upon switching off the light. Long-lifetime emission from triplet excitons has outstanding potential, but forbidden transition property due to Pauli exclusion principle makes them dark, and it stays challenging develop full-color bright excitons. Herein, ultraviolet (UV) near infrared (NIR) in carbon nanodots (CNDs) is achieved by confining multicolor CNDs emitters NaCNO crystal. crystal can isolate CNDs, quenching caused excited state electrons aggregation induced energy transfer suppressed, confinement furthermore promote phosphorescence inhibiting dissipation non-radiative transition. The radiative recombination covers spectral region 300 nm 800 (NIR), corresponding lifetimes reach 15.8, 818.0, 239.7, 168.4, 426.4, 127.6 ms. Furthermore, eco-friendly luminescent lampshades are designed based on phosphorescent time light-emitting diodes thus demonstrated. findings will motivate new opportunities development UV NIR applications.

Язык: Английский

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Recent Advances of Carbon Dots with Afterglow Emission

Small, Год журнала: 2023, Номер 19(31)

Опубликована: Фев. 21, 2023

Abstract Carbon dots (CDs) have gradually become a new generation of nano‐luminescent materials, which received extensive attention due to excellent optical properties, wide source raw low toxicity, and good biocompatibility. In recent years, there are many reports on the luminescent phenomenon CDs, great progress has been achieved. However,there rarely systematic summaries CDs with persistent luminescence. Here, summary including luminous mechanism, synthetic strategies, property regulation, potential applications, is given. First, brief introduction given development materials. Then, mechanism afterglow from room temperature phosphorescence (RTP), delayed fluorescence (DF), long luminescence (LPL) discussed. Next, constructed methods materials summarized two aspects, matrix‐free self‐protected matrix‐protected CDs. Moreover, regulation properties color, lifetime, efficiency presented. Afterwards, applications such as anti‐counterfeiting, information encryption, sensing, bio‐imaging, multicolor display, LED devices, etc., reviewed. Finally, an outlook proposed.

Язык: 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, Год журнала: 2023, Номер 62(23)

Опубликована: Апрель 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.

Язык: Английский

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Photooxidation triggered ultralong afterglow in carbon nanodots

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Март 15, 2024

Abstract It remains a challenge to obtain biocompatible afterglow materials with long emission wavelengths, durable lifetimes, and good water solubility. Herein we develop photooxidation strategy construct near-infrared carbon nanodots an extra-long lifetime of up 5.9 h, comparable that the well-known rare-earth or organic long-persistent luminescent materials. Intriguingly, size-dependent evolution from 3.4 h has been observed systems in aqueous solution. With structural/ultrafast dynamics analysis density functional theory simulations, reveal persistent luminescence is activated by photooxidation-induced dioxetane intermediate, which can slowly release convert energy into luminous via steric hindrance effect nanoparticles. luminescence, tissue penetration depth 20 mm be achieved. Thanks high signal-to-background ratio, biological safety cancer-specific targeting ability nanodots, ultralong-afterglow guided surgery successfully performed on mice model remove tumor tissues accurately, demonstrating potential clinical applications. These results may facilitate development long-lasting for precision resection.

Язык: Английский

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Visible Light‐Activated Ultralong‐Lived Triplet Excitons of Carbon Dots for White‐Light Manipulated Anti‐Counterfeiting

Small, Год журнала: 2023, Номер 20(1)

Опубликована: Авг. 30, 2023

Abstract Room temperature phosphorescence (RTP) has emerged as an interesting but rare phenomenon with multiple potential applications in anti‐counterfeiting, optoelectronic devices, and biosensing. Nevertheless, the pursuit of ultralong lifetimes RTP under visible light excitation presents a significant challenge. Here, new phosphorescent materials that can be excited by record‐long are demonstrated, realized through embedding nitrogen doped carbon dots (N‐CDs) into poly(vinyl alcohol) (PVA) film. The lifetime N‐CDs@PVA film is remarkably extended to 2.1 s 420 nm, representing highest recorded value for light‐excited materials. Theoretical experimental studies reveal robust hydrogen bonding interactions effectively reduce non‐radiative decay rate radiative transition triplet excitons, thus dramatically prolong lifetime. Notably, emission also activated easily accessible low‐power white‐light‐emitting diode. More significantly, practical state‐of‐the‐art anti‐counterfeiting security optical information storage domains further demonstrated. This research offers exciting opportunities utilizing light‐activated ultralong‐lived systems wide range promising applications.

Язык: Английский

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