Carbon Nanodots with Nearly Unity Fluorescent Efficiency Realized via Localized Excitons DOI
Qing Lou,

Qingchao Ni,

Chunyao Niu

et al.

Advanced Science, Journal Year: 2022, Volume and Issue: 9(30)

Published: Aug. 24, 2022

Abstract Carbon nanodots (CDs) have emerged as an alternative option for traditional nanocrystals due to their excellent optical properties and low toxicity. Nevertheless, high emission efficiency is a long‐lasting pursuit CDs. Herein, CDs with near‐unity are prepared via atomic condensation of doped pyrrolic nitrogen, which can highly localize the excited states thus lead formation bound excitons symmetry break π –electron conjugation. The short radiative lifetimes (<8 ns) diffusion lengths (<50 nm) imply that be efficiently localized by recombination centers defect‐insensitive By incorporating into polystyrene, flexible light‐converting films solid‐state quantum 84% good resistance water, heating, UV light obtained. With CD–polymer conversion layers, CD‐based white light‐emitting diodes (WLEDs) luminous 140 lm W −1 flat‐panel illumination system lighting sizes more than 100 cm 2 achieved, matching state‐of‐the‐art nanocrystal‐based LEDs. These results pave way toward carbon‐based luminescent materials technology.

Language: Английский

Solvothermal synthesis and applications of micro/nano carbons: A review DOI
Yan Huo,

Shijian Xiu,

Long-Yue Meng

et al.

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 451, P. 138572 - 138572

Published: Aug. 11, 2022

Language: Английский

Citations

127
Toward Strong Near‐Infrared Absorption/Emission from Carbon Dots in Aqueous Media through Solvothermal Fusion of Large Conjugated Perylene Derivatives with Post‐Surface Engineering DOI
Yupeng Liu, Josh Haipeng Lei, Gang Wang

et al.

Advanced Science, Journal Year: 2022, Volume and Issue: 9(23)

Published: June 2, 2022

Carbon dots (CDs) have attracted significant interest as one of the most emerging photoluminescence (PL) nanomaterials. However, realization CDs with dominant near-infrared (NIR) absorption/emission peaks in aqueous solution remains a great challenge. Herein, both main NIR absorption bands at 720 nm and emission 745 an are fabricated for first time by fusing large conjugated perylene derivatives under solvothermal treatment. With post-surface engineering, polyethyleneimine modified (PEI-CDs) exhibit enhanced PL quantum yields (PLQY) up to 8.3% 18.8% bovine serum albumin DMF solutions, which is highest PLQY region excitation. Density functional theory calculations support strategy achieve emissions from CDs. Compared commercial dye Indocyanine green, PEI-CDs excellent photostability much lower cost. Furthermore, obtained illustrate advantages remarkable two-photon angiography vivo fluorescence bioimaging. This work demonstrates promising molecules preparing strong promote their bioimaging applications.

Language: Английский

Citations

113
Light of carbon: Recent advancements of carbon dots for LEDs DOI
Chunyu Ji, Wenjun Xu,

Qiurui Han

et al.

Nano Energy, Journal Year: 2023, Volume and Issue: 114, P. 108623 - 108623

Published: June 20, 2023

Language: Английский

Citations

109
Facile Access to Fabricate Carbon Dots and Perspective of Large‐Scale Applications DOI

Lintao Chen,

Cai‐Feng Wang, Chang Liu

et al.

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

Published: Dec. 7, 2022

Abstract Carbon dots (CDs), fluorescent carbon nanoparticles with particle sizes < 10 nm, are constantly being developed for potential large‐scale applications. Recently, methods allow CD synthesis to be carried out on preparation in a controlled fashion potentially important multiple disciplines, including bottom‐up strategy, top‐down method. In this review, the recent progresses research of production CDs and their functionalization summarized. Especially, synthesis, such as preparation, hydrothermal/solvothermal, microwave‐assisted, magnetic hyperthermia microfluidic other methods, along CDs, summarized detail. By promising applications there three aspects have been already reported, enhancing mechanical properties, flame retardancy, energy storage. Also, future development is prospected.

Language: Английский

Citations

76
Lasing of carbon dots: Chemical design, mechanisms, and bright future DOI Creative Commons
Yongqiang Zhang, Siyu Lu

Chem, Journal Year: 2023, Volume and Issue: 10(1), P. 134 - 171

Published: Oct. 19, 2023

Language: Английский

Citations

73
Assignment of Core and Surface States in Multicolor‐Emissive Carbon Dots DOI

Bohan Zhang,

Bingzhe Wang, Elena V. Ushakova

et al.

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

Published: Oct. 10, 2022

Abstract It is important to reveal the luminescence mechanisms of carbon dots (CDs). Herein, CDs with two types optical centers are synthesized from citric acid in formamide by a solvothermal method, and show high photoluminescence quantum yield reaching 42%. Their green/yellow emission exhibits pronounced vibrational structure resistance toward photobleaching, while broad red sensitive solvents, temperature, UV–IR. Under UV–IR, gradually bleached due photoinduced dehydration deprotonated surface dimethyl sulfoxide, this process hindered water. From analysis steady‐state time‐resolved transient absorption data together density functional theory calculations, green/ yellow assigned conjugated sp 2 ‐domains (core state) similar organic dye derivatives stacked within disk‐shaped CDs; emission—to oxygen‐containing groups bound (surface state), whereas energy transfer core state can happen.

Language: Английский

Citations

72
Innovations in the Solid‐State Fluorescence of Carbon Dots: Strategies, Optical Manipulations, and Applications DOI
Haolin Wang, Lin Ai, Haoqiang Song

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(41)

Published: June 13, 2023

Abstract Carbon dots (CDs)—carbon nanoparticles smaller than 10 nm—have attracted widespread attention owing to their excellent optical properties. However, high‐performing CDs often suffer from severe aggregation‐induced quenching in the solid state, which limits commercial applicability. Therefore, CD materials with efficient solid‐state luminescence are sought. As research on structure and photoluminescence mechanisms of has intensified recent years, strategies construct fluorescent tune emissions have broadened. This article reviews advances for attaining fluorescence CDs, describes specific ways properties this fluorescence, introduces latest applications resulting optoelectronics, biology, sensing, finally considers prospects future application current challenges facing development CDs.

Language: Английский

Citations

72
Multiple Stimuli‐Response Polychromatic Carbon Dots for Advanced Information Encryption and Safety DOI

Youfusheng Wu,

Xiao Chen, Wei Wu

et al.

Small, Journal Year: 2023, Volume and Issue: 19(10)

Published: Jan. 15, 2023

Abstract Optical information encryption and safety have aroused great attention since they are closely correlated to data protection safety. The development of multiple stimuli‐response optical materials for constructing large‐capacity is very important practical applications. Carbon dots (CDs) many gratifying merits, such as polychromatic emission, diverse luminous categories, stable physicochemical properties, considered one the most ideal candidates protection. Herein, carbon core, functional groups, solvents, other crucial factors reviewed outputting emission categories. In particular, substrate engineering strategies been emphasized their critical role in yielding excellent features High‐capacity by relying on rich properties CDs, categories fluorescence, afterglow, upconversion, well external‐stimuli‐assisted changes. Some perspectives preparing CDs further developing security proposed. This review provides a good reference manipulation next‐generation

Language: Английский

Citations

71
Red emissive carbon dots as a fluorescent sensor for fast specific monitoring and imaging of polarity in living cells DOI Creative Commons
Zheng Yang, Hui Li, Tiantian Xu

et al.

Journal of Materials Chemistry A, Journal Year: 2023, Volume and Issue: 11(6), P. 2679 - 2689

Published: Jan. 1, 2023

This work presents red emissive CDs as a promising fluorescent sensor with excellent photostability, high fluorescence quantum yield, and negligible cytotoxicity for real-time sensing visualizing polarity changes in mitochondria lysosomes.

Language: Английский

Citations

56
Triphenylamine‐Derived Solid‐State Emissive Carbon Dots for Multicolor High‐Efficiency Electroluminescent Light‐Emitting Diodes DOI Open Access
Biao Zhao,

Huanyu Ma,

Haoran Jia

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(22)

Published: March 31, 2023

Two kinds of triphenylamine-derived solid-state emissive carbon dots (CDs) with orange and yellow color are facilely synthesized through solvothermal treatment, taking advantage the nonplanar structure good carrier mobility triphenylamine unit. Theoretical calculations show that could greatly inhibit direct π-π stacking aromatic skeletons enhance fluorescence properties CDs in aggregation state. By adopting as single layer, high-performance orange-color green-color electroluminescent light-emitting diodes (LEDs) successfully fabricated, maximum brightness 9450/4236 cd m-2 , high current efficiency 1.57/2.34 A-1 low turn-on voltage 3.1/3.6 eV respectively achieved. Significantly, white-color LED device is further prepared. This work provides a universal platform for construction novel significant applications photoelectric device.

Language: Английский

Citations

54