Endowing matrix-free carbon dots with color-tunable ultralong phosphorescence by self-doping

Shi, Huixian; Niu, Zuoji; He, Wei; Ye, Wenpeng; Xi, Kai; Huang, Xiao; Wang, Hongliang; Liu, Yanfeng; Lin, Hengwei; Shi, Huifang; An, Zhongfu

doi:10.1039/d2sc01167k

Cited by 69 publications

(73 citation statements)

References 48 publications

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“…Visually, fluorescence microscopy images (Figure S16, Supporting Information) of excess CDs 190 , CDs 210 , and CDs 220 powders in an aqueous solution indicate that thickly stacking CD powders generated white PL, and the dissolved CD solutions displayed blue FL . The photographs in Figure d show the pure CDs 190 , CDs 210 , and CDs 220 solutions and the solutions with an addition of ethanol to a volume of 95% . More intuitively, CDs 190 , CDs 210 , and CDs 220 were dissolved in water, but not in ethanol (Figure d).…”

Section: Resultsmentioning

confidence: 98%

“…30 The photographs in Figure 3d show the pure CDs 190 , CDs 210 , and CDs 220 solutions and the solutions with an addition of ethanol to a volume of 95%. 31 More intuitively, CDs 190 , CDs 210 , and CDs 220 were dissolved in water, but not in ethanol (Figure 3d). When the volume ratio of the ethanol was greater than 80%, the as-prepared CDs 190 , CDs 210 , and CDs 220 solutions began to separate the brown powder, turning it into a turbid liquid with a suspension, and the precipitation was complete within 45 min.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Exceeding 67.35% Efficient and Color Temperature Tunable White Light from Carbon Dots with Quadruple-Channel Fluorescence–Phosphorescence Emission

Shen

Chen

et al. 2022

ACS Sustainable Chem. Eng.

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Luminescent carbon dots (CDs) have drawn much attention in terms of photoelectronic applications, most of which are focused on single-component white-light emission. However, it still remains a significant challenge to create high-quality white-light-emitting CDs with tunable correlated color temperatures (CCTs). The theoretical calculation is initially used to predict that the enlargement of the conjugated sp 2 domain induces redshift fluorescence (FL) and room temperature phosphorescence (RTP) emissions of CDs. Guided by the theoretical predictions, single-component white-light emission from CDs with high efficiency of 67.35% and tunable CCTs from 10,803 to 3376 K is realized. These CDs exhibit quadruple-model emissions with hybrid FL/RTP components at 435 nm (FL-1)/548 nm (RTP-1) and 461–522 nm (FL-2)/525–610 nm (RTP-2), which originate from a synergy between certain P bonds with aggregation-induced emission effects and different sizes of sp 2 conjugated structures, respectively. Using such CDs as conversion phosphors, we prepared three white-light-emitting diodes (WLEDs) which can emit bright cool, standard, and warm white lights with color rendering indices of 81–85. Finally, highly luminescent WLEDs are also developed by dispersing these CDs in a poly(vinyl alcohol) matrix, indicating that this provides an industrial application potential.

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Section: Resultsmentioning

confidence: 98%

Section: ■ Results and Discussionmentioning

confidence: 99%

Exceeding 67.35% Efficient and Color Temperature Tunable White Light from Carbon Dots with Quadruple-Channel Fluorescence–Phosphorescence Emission

Shen

Chen

et al. 2022

ACS Sustainable Chem. Eng.

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“…For instance, as shown in Figure 7e, a beautiful rose is fabricated by utilizing different CDs‐based security inks, depicting variational RTP colors in a flower and a leaf as excitation wavelength changes. [ 101 ] In this aspect, the time‐gating anti‐counterfeiting strategy is fabricated by monitoring the change of RTP color at different times. As revealed in Figure 7f, under 365 nm excitation, a blue “three fish play lotus” pattern is obtained and dynamic changes are revealed after removal of 365 nm excitation, which shows a high‐level security feature.…”

Section: Multilevel Information Encryption and Safetymentioning

confidence: 99%

“…Reproduced with permission. [ 101 ] Copyright 2022, The Royal Society of Chemistry. f) Dynamic “three fish play lotus” pattern under 365 nm excitation and removal of 365 nm excitation at different times.…”

Section: Multilevel Information Encryption and Safetymentioning

confidence: 99%

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

Chen

2023

Small

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the requirements of the market because counterfeiters have very sophisticated techniques to replicate current anticounterfeiting techniques. [2] Thereby, the development of advanced information encryption and anti-counterfeiting strategies that are difficult to replicate is of great significance and has an irreplaceable position in practical application. Based on this background, stimuli-response information encryption and anti-counterfeiting techniques are proposed to achieve high information encryption and anti-counterfeiting strength. Important encoding information is stored and read out in an "on-off" way by altering the stimulation situations. By screening different stimulus conditions, the researchers found that light-induced tunable optical output possesses the advantages of easy operation and promotion, fast detection speed, and low cost, and has great potential in practical applications. [3] It is well-known that optical materials are a typical example, which can be excited by different light sources and then produce controllable optical output. By designing various

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“…Persistent luminescence or afterglow materials play important roles in luminescence bioimaging, , anticounterfeiting, and encryption. − Since persistent luminescence could usually last over seconds after ceasing excitation, the interferences of autofluorescence and scattering light could be eliminated without any complicated and expensive gated technology. , Because of the flexible processability of organic compounds, organic persistent luminescence has attracted wide attention these years. So far, many organic crystals, − host–guest mixtures, − polymers, − and carbon dots ,,− with effective persistent luminescence have been developed. Most of these materials contain conjugated groups such as aromatic and heterocyclic rings.…”

Section: Introductionmentioning

confidence: 99%

Efficient Persistent Luminescence from Cellulose–Halide Mixtures for Optical Encryption

Zhu

Zeng

et al. 2022

ACS Sustainable Chem. Eng.

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Natural renewable resources with long-lived persistent luminescence have attracted wide attention since many of these luminescence materials have low toxicity and are environmentally friendly. However, many of these materials lack conjugated groups such as aromatic rings, leading to weak absorption and low luminescence quantum yields. Herein, we proposed an effective method to enhance the luminescence of cellulose, a natural polymer free of conjugated groups. Halide salts were doped in cellulose for inducing absorption transition from halide ions to polysaccharide chains and increasing intersystem crossing through the external heavy-atom effect. In addition, divalent metal ions doped in cellulose could reduce nonradiative relaxations through electrostatic interactions. The phosphorescence quantum yield of dried cellulose doped with MgBr 2 could reach 5%, significantly higher than that of many other natural renewable resources. The results provided a simple and effective method for tuning the persistent luminescence of cellulose, which could be easily applied to optical encryption on cellulose-based textiles and papers. This method may be extended widely for enhancing the clusteringtriggered emission of many other nonconjugated organic materials in luminescence bioimaging, anticounterfeiting, and encryption.

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Endowing matrix-free carbon dots with color-tunable ultralong phosphorescence by self-doping

Abstract: A new type of CDs with abundant carbonyl groups shows color-tunable ultralong phosphorescence from blue to red by self-doping, which was applied in information encryption and light detection.

Cited by 69 publications

References 48 publications

Exceeding 67.35% Efficient and Color Temperature Tunable White Light from Carbon Dots with Quadruple-Channel Fluorescence–Phosphorescence Emission

Exceeding 67.35% Efficient and Color Temperature Tunable White Light from Carbon Dots with Quadruple-Channel Fluorescence–Phosphorescence Emission

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

Efficient Persistent Luminescence from Cellulose–Halide Mixtures for Optical Encryption

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