Advances in Shell and Core Engineering of Carbonized Polymer Dots for Enhanced Applications

Accounts of Chemical Research, Journal Year: 2024, Volume and Issue: 57(19), P. 2928 - 2939

Published: Sept. 19, 2024

ConspectusCarbon dots (CDs), as a novel type of fluorescent nanocarbon material, attract widespread attention in nanomedicine, optoelectronic devices, and energy conversion/storage due to their excellent optical properties, low toxicity, high stability. They can be classified graphene quantum dots, carbon carbonized polymer (CPDs). Among these, CPDs exhibit tunable structures components that allow fine-tuning making them one the most popular types CDs recent years. However, structural complexity stimulates deep exploration relationship between unique structure luminescent performance. As an organic-inorganic hybrid system, diversity self-limited state cores polymer-hybrid shell layers makes understanding underlying mechanisms structure-property relationships very challenging task. In this context, elucidating composition factors affect properties is vital if enormous potential realized. Achieving controllable with predefined via adoption specific functionalization strategies prized goal current researchers field.In Account, we describe efforts made by our group synthesis, mechanism analysis, regulation, functional applications CPDs, particular emphasis on design core-shell tailored for fields optoelectronics energy. Specifically, through rational selection precursors, optimization reaction conditions, postmodification have demonstrated it possible regulate both core layers, thereby achieving full-spectrum emission, yield, persistent luminescence, thermally activated delayed fluorescence, laser action CPDs. Furthermore, established structure-performance proposed universal strategy synergistic interactions carbon-based surface micronanostructures. addition, unveiled luminescence cross-linked specifically "cross-linking synergistically inducing quantum-state luminescence", which addresses challenge efficient circularly polarized liquid solid phases Subsequently, strong cross-linking, dual-rigidity, ordering preparation methods were introduced, pioneering emission from blue near-infrared wavelengths. Additionally, developed new "confined composite nanocrystals CPDs", leading various high-performance hydrogen evolution catalysts water electrolysis. The not only possessed but also enabled efficiencies field conversion, thus maximizing utilization Finally, discuss important trends CPD research development. Overall, Account summarizes latest advancements years, providing case-studies enable structure-property-performance regulation guiding future expansion application

Language: Английский

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Efficient Tunable White Emission and Blue Light‐Excited Near‐Infrared Emission in Lead‐Free Metal Halide Crystals with Ultra‐High Luminous Efficiency for Multispectral Image Fusion and 3D Image Reconstruction

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 26, 2025

Abstract 0D hybrid Sb(III) halides generally exhibit unique crystal structure and efficient emission. However, achieving white light blue light‐excited near‐infrared (NIR) emission remains an enormous challenge. Herein, a series of (18‐crown‐6@K) 2 SbX 5 (X = Cl, Br) crystals with different Cl/Br rations are synthesized via supramolecular self‐assembly. All compounds show the broadband emission, which stems from self‐trapped excitons in [SbX ] 2− pseudo‐octahedral structure. Particularly, SbCl shows tunable under various excitation wavelengths, ultra‐high luminous efficiency 92.3% is obtained 310 nm excitation. As Br gradually replaces not only bands red‐shift but also facilitate intersystem crossing process singlet to triplet excitons. Thus, independent NIR upon 450 58.2% SbBr crystals. Moreover, high‐performance single‐component light‐emitting diode (WLED) based on LED fabricated, image fusion realized. Finally, combined multiangle imaging WLED irradiation, 3D reconstruction centrifuge tube wrapped capsule successfully demonstrated.

Language: Английский

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Manipulating Phase and Defect Distribution of Quasi-2D Perovskites via a Synergistic Strategy for Enhancing the Performance of Blue Light-Emitting Diodes

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 23, 2025

Quasi-two-dimensional (quasi-2D) mixed-halide perovskites are a requisite for their applications in highly efficient blue perovskite light-emitting diodes (PeLEDs) owing to strong quantum confinement effect and high exciton binding energy. The pace of quasi-2D PeLEDs is hindered primarily by two factors: challenges precisely managing the phase distribution defect-mediated nonradiative recombination losses. Herein, we utilize 2,2-diphenylethylamine (DPEA+) with bulky steric hindrance disturb assembly process slender spacer host cation, 4-fluorophenylethylammonium (p-F-PEA+), enhancing management PeLEDs. DPEA+ not only inhibits small-n but also strengthens carrier transport alleviates quenching. In addition, dual additives─formamidine acetate (FAoAc) guanidine thiocyanate (GASCN)─were incorporated assist tailoring passivation remaining defects films. C═O SCN- groups can coordinate Pb2+ suppress charge trap density recombination. As result employing synergetic strategy comprehensive regulation defect passivation, optimized device achieves emission at 479 nm 5× improvement external efficiency (EQE) 13× increase operating stability. This paves simple route toward high-performance blue-emission

Language: Английский

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Emission-Tunable Quasi-2D (PEA)₂FA_n–1Pb_nBr_3n+1 Perovskite Films via an A-Site Cation-Assisted Strategy for Light-Emitting Diodes

The Journal of Physical Chemistry C, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

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Solution-Processed Near Unit Carbon Dots-Based Deep-Blue Electroluminescent Light-Emitting Diodes with External Quantum Efficiency over 10%

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 7, 2025

Deep-blue electroluminescent light-emitting diodes (ELEDs) are crucial for various applications, including solid-state lighting, high-density information storage, and vibrant displays. Currently, the development of conventional deep-blue ELEDs is predominantly based on multilayer evaporation structures. Despite significant technological progress, fabrication devices via low-cost solution processing has still not fully been realized. Given that, a novel approach their emission carbon dots (CDs) proposed in this study. The as-prepared CDs exhibited quantum yield close to 100% high exciton binding energy. CDs-based provided at wavelength 450 nm, with CIE coordinates (0.15, 0.07), closely approaching standard color Rec. 2020 specification (0.131, 0.046). These results provide sufficient evidence that fabricated work one highest-performing developed so far, providing efficiency over 10%.

Language: Английский

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