Tailored Fabrication of Carbon Dot Composites with Full‐Color Ultralong Room‐Temperature Phosphorescence for Multidimensional Encryption

Advanced Science, Journal Year: 2021, Volume and Issue: 9(3)

Published: Nov. 19, 2021

Abstract Ultralong room‐temperature phosphorescence (RTP) is highly useful for information encryption, organic electronics, bioelectronics, etc. However, the preparation of related metal‐free materials with multiple colors across full spectrum remains a major challenge. Herein, facile method developed to fabricate boron‐doped carbon dot (B‐CD) composites full‐color long lifetime RTP continuously tailorable in range 466–638 nm simply by pyrolysis citric acid and boric precursors various mass ratios at different temperatures. This leads formation luminescent B‐CD centers rigid polycrystalline B 2 O 3 matrix, which effectively stabilizes triplet excited states B‐CDs. Thus, become phosphorescent over relatively period (5–12 s) after removal irradiation source. Meanwhile, increased particle size oxidation degree B‐CDs obtained larger feeding or higher temperature shift from blue red. Due luminescence centers, can also be finely modulated excitation wavelength. The resulting tunable further allow variety distinctive applications multidimensional encryption handily utilizing space, time, color variations.

Language: Английский

---

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

---

Enabling robust and hour-level organic long persistent luminescence from carbon dots by covalent fixation

Light Science & Applications, Journal Year: 2022, Volume and Issue: 11(1)

Published: March 29, 2022

The first carbon dot (CD)-based organic long persistent luminescence (OLPL) system exhibiting more than 1 h of duration was developed. In contrast to the established OLPL systems, herein, reported CDs-based (named m-CDs@CA) can be facilely and effectively fabricated using a household microwave oven, impressively, its LPL observed under ambient conditions even in aqueous media. XRD TEM characterizations, afterglow decay, time-resolved spectroscopy, ESR analysis were performed, showing successful composition CDs CA, formation exciplexes long-lived charged-separated states. Further studies suggest that production covalent bonds between CA plays pivotal roles activating preventing quenching from oxygen water. To best our knowledge, this is very rare example an exhibits hour-level conditions. Finally, applications m-CDs@CA glow-in-the-dark paints for emergency signs multicolored luminous pearls preliminarily demonstrated. This work may provide new insights development rare-earth-free robust materials.

Language: Английский

---

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

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(6)

Published: Nov. 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.

Language: Английский

---

Nearly Unity Quantum Yield Persistent Room‐Temperature Phosphorescence from Heavy Atom‐Free Rigid Inorganic/Organic Hybrid Frameworks

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(35)

Published: June 8, 2022

Synergism between covalent and non-covalent bonds is employed to fix an organic phosphor guest in a rigid inorganic framework, simulating the stiffening effect seen glassy state realizing efficient ultralong room-temperature phosphorescence (RTP). Twelve heavy-atom-free composites have been obtained through introducing arylboric or arylcarboxylic acid derivatives into boric matrix by solid-phase synthesis. Owing of multiple bonds, all show highly persistent RTP molecules with quantum yield ranging from 39.8 % ca. 100 lifetime up 8.74 s, which results 55 s afterglow visible naked eye after exposure portable UV lamp. Interestingly, it found that substitution position quantity carboxyl great influence on phosphorescent properties, heavy-atom invalid such host-guest hybrid systems. The g grade composite easily prepared because solvent-free, green, simple synthesis method. These provide important way for development materials ultrahigh lifetime, as well their practical applications fields anti-counterfeiting information storage, among others.

Language: Английский

---

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

Small, Journal Year: 2023, Volume and Issue: 19(33)

Published: April 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.

Language: Английский

---

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

Chemical Science, Journal Year: 2023, Volume and Issue: 14(14), P. 3705 - 3729

Published: Jan. 1, 2023

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

Language: Английский

---

Surface ionization-induced tunable dynamic phosphorescence colors from carbon dots on paper for dynamic multimode encryption

Carbon, Journal Year: 2022, Volume and Issue: 195, P. 191 - 198

Published: April 6, 2022

Language: Английский

---

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

Small, Journal Year: 2022, Volume and Issue: 19(31)

Published: Nov. 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.

Language: Английский

---

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

Small, Journal Year: 2023, Volume and Issue: 19(31)

Published: Jan. 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.

Language: Английский

---