Recent Advances of Carbon Dots with Afterglow Emission DOI
Huixian Shi, Yang Wu, Jiahui Xu

et al.

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

Published: Feb. 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.

Language: Английский

Green and Near-Infrared Dual-Mode Afterglow of Carbon Dots and Their Applications for Confidential Information Readout DOI Creative Commons

Yuci Wang,

Kai Jiang, Jiaren Du

et al.

Nano-Micro Letters, Journal Year: 2021, Volume and Issue: 13(1)

Published: Sept. 16, 2021

Near-infrared (NIR), particularly NIR-containing dual-/multi-mode afterglow, is very attractive in many fields of application, but it still a great challenge to achieve such property materials. Herein, we report facile method prepare green and NIR dual-mode afterglow carbon dots (CDs) through situ embedding o-CDs (being prepared from o-phenylenediamine) into cyanuric acid (CA) matrix (named o-CDs@CA). Further studies reveal that the afterglows o-CDs@CA originate thermal activated delayed fluorescence (TADF) room temperature phosphorescence (RTP) o-CDs, respectively. In addition, formation covalent bonds between CA, presence multiple fixation rigid effects triplet states are confirmed be critical for activating observed afterglow. Due shorter lifetime insensitiveness human vision RTP o-CDs@CA, completely covered by TADF during directly observing. The signal, however, can readily captured if an optical filter (cut-off wavelength 600 nm) being used. By utilizing these unique features, applications anti-counterfeiting information encryption have been demonstrated with confidentiality. Finally, as-developed was applicable other kinds CDs achieving or enhancing their performances.

Language: Английский

Citations

111
One‐Step Synthesis of White‐Light‐Emitting Carbon Dots for White LEDs with a High Color Rendering Index of 97 DOI Creative Commons

Zishan Yan,

Tong Chen, Lingpeng Yan

et al.

Advanced Science, Journal Year: 2023, Volume and Issue: 10(12)

Published: Feb. 23, 2023

White-light-emitting carbon dots (WCDs) show innate advantages as phosphors in white light-emitting diodes (WLEDs). For WLEDs, the color rendering index (CRI) is most important metric to evaluate its performance. Herein, WCDs are prepared by a facile one-step solvothermal reaction of trimellitic acid and o-phenylenediamine. It consists four CDs identified column chromatography blue, green, yellow, red, thus light superposition these types light. The mixture undergoes Förster resonance energy transfer induce generation photoluminescence originates from synergistic effect core surface states. Thereinto, states dominate RCDs, increase amide contents degree conjugation promote redshift emission spectra, which further confirmed theoretical calculations. In addition, high CRI 97 achieved when used fabricate almost highest value up now. multicolor LEDs can also be fabricated using phosphors, respectively. This work provides novel approach explore rapid preparation low-cost, high-performance CDs-based WLEDs.

Language: Английский

Citations

100
Hydrogen-bond organized 2D metal–organic microsheets: direct ultralong phosphorescence and color-tunable optical waveguides DOI
Shuya Liu, Yuhang Lin, Dongpeng Yan

et al.

Science Bulletin, Journal Year: 2022, Volume and Issue: 67(20), P. 2076 - 2084

Published: Sept. 26, 2022

Language: Английский

Citations

88
Endowing matrix-free carbon dots with color-tunable ultralong phosphorescence by self-doping DOI Creative Commons
Huixian Shi,

Zuoji Niu,

He Wang

et al.

Chemical Science, Journal Year: 2022, Volume and Issue: 13(15), P. 4406 - 4412

Published: Jan. 1, 2022

Color-tunable ultralong phosphorescence is urgently desired in optoelectronic applications. Herein, we report a new type of full-color-tunable carbon dots (CDs) without matrix-assistance by self-doping method under ambient conditions. The color can be rationally tuned from blue to red changing the excitation wavelength 310 440 nm. CDs exhibit an lifetime up 1052.23 ms at 484 From experimental data, speculate that excitation-dependent multi-color attributed presence multiple emitting centers related carbonyl units. Given unique color-tunability CDs, demonstrate their potential applications information encryption, light detection ranging UV visible and LED devices. This finding not only takes step towards fundamental design full-color emissive materials, but also provides broader scope for phosphorescent materials.

Language: Английский

Citations

83
Carbon Dots with Blue‐to‐Near‐Infrared Lasing for Colorful Speckle‐Free Laser Imaging and Dynamical Holographic Display DOI
Yongqiang Zhang, Jinping Wang, Lu Wang

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(31)

Published: May 5, 2023

Abstract As a new solution‐processable laser material, carbon dots (CDs) offer advantages of non‐toxicity, low‐cost, and high‐stability, which are conducive to the sustainable development miniaturized lasers. Full‐color CDs (FC‐CDs) with bright‐blue, green, yellow, red, deep‐red, near‐infrared (NIR) fluorescence prepared. Their photoluminescence emission ranges from 431 714 nm. The FC‐CDs show narrow full widths at half maximum in range 44–76 nm, concurrent high radiative transition rates ( K R ) 0.54–1.74 × 10 8 s −1 ; their performance is comparable that organic dyes, indicating good gain potential for Laser pumping gives outputs 467.3, 533.5, 577.4, 616.3, 653.5, 705.1 spanning blue NIR region, covering 140% NTSC color gamut. Q‐factors (2000–5500), appreciable coefficients (9–21.5 cm ), better stability (≈100%@4–7 h) than commercial dyes. These excellent properties make them suitable high‐quality, colorful, speckle‐free imaging dynamic holographic display. findings will be helpful promoting practical applications CD‐based

Language: Английский

Citations

81
Disulfide Crosslinking‐Induced Aggregation: Towards Solid‐State Fluorescent Carbon Dots with Vastly Different Emission Colors† DOI
Rui Fu, Haoqiang Song, Xingjiang Liu

et al.

Chinese Journal of Chemistry, Journal Year: 2023, Volume and Issue: 41(9), P. 1007 - 1014

Published: Jan. 14, 2023

Comprehensive Summary Solid‐state fluorescent multi‐color carbon dots (SFM‐CDs), prepared using the same precursor(s) without need for dispersion in a solid matrix, are highly demanded wide range of applications. Herein, we report microwave‐assisted strategy preparation SFM‐CDs with blue, yellow and red emissions within 5 min from precursors. The as‐prepared B‐CDs, Y‐CDs, R‐CDs possessed bright fluorescence at 425 nm, 550 640 photoluminescence quantum yields (PLQYs) 54.68%, 17.93%, 2.88%, respectively. structure consisted 5‐oxo‐3,5‐dihydro‐2 H ‐thiazolo [3,2‐ ] pyridine‐7‐carboxylic acid (TPCA) immobilized on surface core, size core degree disulfide crosslinking between CDs both increasing going B‐CDs to R‐CDs, as verified by mechanochromic experiments. excellent solid‐state performance allowed their utilization converter layer LEDs white high color rendering index.

Language: Английский

Citations

80
Carbon Dots in Hydroxy Fluorides: Achieving Multicolor Long-Wavelength Room-Temperature Phosphorescence and Excellent Stability via Crystal Confinement DOI

Ping Liang,

Yihao Zheng, Xingcai Zhang

et al.

Nano Letters, Journal Year: 2022, Volume and Issue: 22(13), P. 5127 - 5136

Published: June 14, 2022

Carbon dots (CDs) have aroused widespread interest in the construction of room-temperature phosphorescent (RTP) materials. However, it is a great challenge to obtain simultaneous multicolor long-wavelength RTP emission and excellent stability CD-based Herein, novel universal "CDs-in-YOHF" strategy proposed generate by confining various CDs Y(OH)xF3–x (YOHF) matrix. The mechanism triplet related space confinement, formation hydrogen bonds C–F bonds, electron-withdrawing fluorine atoms. Remarkably, lifetime orange-emissive CDs-o@YOHF longest among reported single-CD-matrix composites for above 570 nm. Furthermore, exhibited higher performance at long wavelength comparison CDs-o@matrix (matrix = PVA, PU, urea, silica). resulting CDs@YOHF shows photostability, thermostability, chemical stability, temporal which rather favorable information security, especially complex environment.

Language: Английский

Citations

79
Brighten Triplet Excitons of Carbon Nanodots for Multicolor Phosphorescence Films DOI
Qing Cao, Kai-Kai Liu,

Ya‐Chuan Liang

et al.

Nano Letters, Journal Year: 2022, Volume and Issue: 22(10), P. 4097 - 4105

Published: May 10, 2022

Triplet excitons usually do not emit light under ambient conditions due to the spin-forbidden transition rule, thus they are called dark excitons. Herein, triplet in carbon nanodots (CNDs) brightened by embedding CNDs into poly(vinyl alcohol) (PVA) films; flexible multicolor phosphorescence films demonstrated. PVA chains can isolate CNDs, and excited state electron or energy transfer induced exciton quenching is reduced; while formed hydrogen bonds between restrict vibration/rotation of further protecting from nonradiative recombination. The lifetimes reach 567, 1387, 726, 311 ms, longest-lasting film be observed naked eyes for nearly 15 s even after bending 5000 times. processed various patterns, a dynamic optical signature concept has been proposed demonstrated based on films.

Language: Английский

Citations

74
Evolution and fabrication of carbon dot-based room temperature phosphorescence materials DOI Creative Commons
Jiurong Li, Yongzhong Wu, Xiao Gong

et al.

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

Citations

74
Room Temperature Phosphorescence Carbon Dots: Preparations, Regulations, and Applications DOI
Shengju Zhou,

Feixiang Wang,

Ning Feng

et al.

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

Citations

74