Solution-processable carbon dots with efficient solid-state red/near-infrared emission

Qu, Yanfei; Bai, Xuewei; Li, Di; Zhang, Xiaoyu; Liang, Chao; Zheng, Weitao; Qu, Songnan

doi:10.1016/j.jcis.2021.12.192

Cited by 33 publications

(10 citation statements)

References 51 publications

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“…3, the XPS results of all CDs under LED + UV light demonstrate the decreased functional groups (CO, C–C/CC, amino N, and amide N). 40,42–45 As listed in Table 1, the peak area of CC/C–C for the CA-CDs decreased from 51.23% to 46.22%, while the peak area of CO/O–CO from the O 1s spectrum decreased from 43.28% to 30.58%. For the N1-CDs, the peak area of CO from the O 1s spectrum decreased from 53.06% to 40.62%.…”

Section: Resultsmentioning

confidence: 96%

“…40 Peaks around 1652, 1581 and 1563 cm −1 in the N-doped CDs were assigned to the CC/CO and N-H bends of an amide group. 25,41,42 For the N1-CDs, the peak for the N-H bend in the amide group (1563 cm −1 ) disappeared under LED and LED + UV light (Fig. S5b †), Environmental Science: Nano Paper indicating that the photobleaching firstly occurred on the N-H bend in the amide group.…”

Section: Key Functional Groups As Cds Degradation Sitesmentioning

confidence: 99%

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Light-nutrition coupling effect of degradable fluorescent carbon dots on lettuce

Pan

Xie

et al. 2023

Environ. Sci.: Nano

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Section: Resultsmentioning

confidence: 96%

Section: Key Functional Groups As Cds Degradation Sitesmentioning

confidence: 99%

Light-nutrition coupling effect of degradable fluorescent carbon dots on lettuce

Pan

Xie

et al. 2023

Environ. Sci.: Nano

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“…In this work, we report a one-pot solvothermal synthesis of polymer-passivated CDs that are resistant to aggregation-induced quenching of fluorescence. Indeed, surface passivation of CDs with polymer chains is an established method to enhance their PL and prevent aggregation-induced quenching [ 55 , 56 , 57 ]. Upon blue light excitation, the as-synthesized CDs show an emission spectrum with a green and a red band of comparable intensity.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Synthesis of Dual Color-Emitting CDs: Numerical and Experimental Optimization towards White LEDs

et al. 2023

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Carbon Dots (CDs) are fluorescent carbon-based nanoparticles that have attracted increasing attention in recent years as environment-friendly and cost-effective fluorophores. An application that can benefit from CDs in a relatively short-term perspective is the fabrication of color-converting materials in phosphor-converted white LEDs (WLEDs). In this work we present a one-pot solvothermal synthesis of polymer-passivated CDs that show a dual emission band (in the green and in the red regions) upon blue light excitation. A purposely designed numerical approach enables evaluating how the spectroscopic properties of such CDs can be profitable for application in WLEDs emulating daylight characteristics. Subsequently, we fabricate nanocomposite coatings based on the dual color-emitting CDs via solution-based strategies, and we compare their color-converting properties with those of the simulated ones to finally accomplish white light emission. The combined numerical and experimental approach can find a general use to reduce the number of experimental trial-and-error steps required for optimization of CD optical properties for lighting application.

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“…Very recently, Ding et al have shown that fluorine doping induces the solid-state fluorescence by forming the defect traps on the edge/surface of F-, N-, and S-doped CDs . In another report, aggregation-induced red shifts have been observed in CDs prepared from branched-poly(ethyleneimine) (b-PEI) in a single-step reaction . They have revealed that the surface −NH 2 group restricted the coupling of the surface state and increased the radiative decay rate.…”

Section: Introductionmentioning

confidence: 99%

“…25 In another report, aggregation-induced red shifts have been observed in CDs prepared from branched-poly(ethyleneimine) (b-PEI) in a single-step reaction. 26 They have revealed that the surface −NH 2 group restricted the coupling of the surface state and increased the radiative decay rate. In all the contexts, selfcoupling of the CD monomer surface functional has been restricted to sustain the emission in the solid state.…”

Section: ■ Introductionmentioning

confidence: 99%

Polymer-Induced Emission-Active Fluorine-Embedded Carbon Dots for the Preparation of Warm WLEDs with a High Color Rendering Index

et al. 2022

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Exploration of many strategies has continuously contributed to producing aggregation-induced red-emissive carbon dots (CDs). In this work, we designed fluorine-embedded (F-embedded) CDs from 1,2,4-triaminobenzene, thiourea, and ammonium fluoride (NH 4 F) exhibiting polymer-induced emission (PIE). The PIE phenomenon of fluorescent CDs is obtained in poly(vinyl alcohol) (PVA), showing emissions at 611 and 617 nm in the dispersed and solid states, respectively. The CDs exhibited a red shift of 28 nm in the PVA solution because PVA hydroxyl groups formed a robust bridge-like H-bonding network between CDs. The fluorine embedded in CDs enhanced the H-bond affinity toward PVA. It showed that this H-bond restricted the coupling of CDs' surface states and inhibited the nonirradiation transfer. For the solid state, surface PVA chains eliminated the π−π interaction of the conjugated core and constructed a selfquenching resistance polymeric system around CDs. As a result, CDs showed an unexpected red shift of fluorescence emission in PVA. Furthermore, white light-emitting diodes (WLEDs) have a correlated color temperature (CCT) of 5232 K, and a high color rendering index of 95 has been fabricated by integrating the red-and green-emissive films over the UV LEDs. Interestingly, the as-synthesized CDs showed room temperature phosphorescence (RTP), which enabled us to employ the CDs in double-security protection. Simultaneously, CDs have been used in fingerprint detection.

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Solution-processable carbon dots with efficient solid-state red/near-infrared emission

Cited by 33 publications

References 51 publications

Light-nutrition coupling effect of degradable fluorescent carbon dots on lettuce

Light-nutrition coupling effect of degradable fluorescent carbon dots on lettuce

One-Pot Synthesis of Dual Color-Emitting CDs: Numerical and Experimental Optimization towards White LEDs

Polymer-Induced Emission-Active Fluorine-Embedded Carbon Dots for the Preparation of Warm WLEDs with a High Color Rendering Index

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