Colorful, time-dependent carbon dot-based afterglow with ultralong lifetime

Cui, Siqian; Wang, Bowei; Zan, Yuxuan; Shen, Zhuoyao; Liu, Shuai; Fang, Wangwang; Yan, Xilong; Yang, Li; Chen, Ligong

doi:10.1016/j.cej.2021.133373

“…The RTP of P3CA@BA has no excitation wavelength-dependent characteristics, indicating that the composite has only a single emission center, which is different from B-doped carbon dots. [45][46][47][48] In addition, Figure S17 shows two excited peaks at 263 and nm contributing to the RTP emission of P3CA@BA at 408 nm, which is in agreement with the absorption peaks of P3CA. Consequently, it can be concluded that the persistent RTP of P3CA@BA mainly comes from the excitation of the guest molecule itself, followed by the decay process: ISC of singlet excitons, and radiative transition of triplet excitons (Figure S18).…”

Section: Methodssupporting

confidence: 79%

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

Zheng

¹

,

Huang

²

,

Lv

³

et al. 2022

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

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“…The RTP of P3CA@BA has no excitation wavelength-dependent characteristics, indicating that the composite has only a single emission center, which is different from B-doped carbon dots. [45][46][47][48] In addition, Figure S17 shows two excited peaks at 263 and 299 nm contributing to the RTP emission of P3CA@BA at 408 nm, which is in agreement with the absorption peaks of P3CA. Consequently, it can be concluded that the persistent RTP of P3CA@BA mainly comes from the excitation of the guest molecule itself, followed by the decay process: ISC of singlet excitons, and radiative transition of triplet excitons (Figure S18).…”

Section: Zuschriftensupporting

confidence: 79%

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

Zheng

¹

,

Huang

²

,

Lv

³

et al. 2022

View full text Add to dashboard Cite

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

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“…C–B bonds can effectively decrease the Δ E ST value, promoting a reverse intersystem crossover (RISC) from the triplet state (T 1 ) to the lowest singlet state (S 1 ) . This indicates that, in comparison with GQDs 2 -6/PVA, GQDs 2 -6/B 2 O 3 composites are more likely to have effective ISC, exhibiting a longer phosphorescent life . The GQDs 2 -6/B 2 O 3 composite shows an excitation-wavelength-independent fluorescence characteristic with a maximum emission at 412 nm (Figure j); for the phosphorescent spectra in Figure k, excitation-independent afterglow emission peaks can be ascribed to the RTP emission, confirming the afterglow is due to RTP, not a thermally activated delayed fluorescence (TADF).…”

Section: Results and Discussionmentioning

confidence: 99%

Chitosan-Derived Carbon Dots with Room-Temperature Phosphorescence and Energy Storage Enhancement Properties

Wu

¹

,

Wang

²

,

Yan

³

et al. 2022

ACS Sustainable Chem. Eng.

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Carbon dots with fluorescence from blue to green have been prepared by a microwave-assisted hydrothermal reaction of a chitosan and sodium hydroxide solution. The carbon dots are conjugated graphite nuclei with developed groups on the surface. OH − acts as an activation agent to induce changes in carbon nuclei and surface properties, leading to a high percentage of CO, C− NC, and CC groups on carbon dots, which are crucial for n−π* and π−π* transitions that contribute to emission at a long wavelength. Na + is helpful in conquering quenching and favorable for the enhanced emission. When it is embedded into a matrix of PVA and boric acid, the composite exhibits obvious roomtemperature property phenomena (RTP) that can be easily recognized by the naked eye for up to 12 s with a lifetime of up to 623 ms. The N and O atoms favor the facilitation of intersystem crossing (ISC) to effectively populate triplet excitons, which contributes to the RTP with a low energy gap. The carbon dots can also act as electron donors and enable a 184% capacitance increase in graphene oxide. The prepared carbon dots exhibit potential applications in the security, sensing, and energy storage fields.

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Colorful, time-dependent carbon dot-based afterglow with ultralong lifetime

Cited by 55 publications

References 53 publications

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

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

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

Chitosan-Derived Carbon Dots with Room-Temperature Phosphorescence and Energy Storage Enhancement Properties

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