Suppressing Non‐Radiative Relaxation through Single‐Atom Metal Modification for Enhanced Fluorescence Efficiency in Molybdenum Disulfide Quantum Dots

Li, Chao-Rui; Lei, Yuli; Li, Hua; Ni, Miao; Yang, Daoguo; Xie, Xiaoyu; Wang, Yuan-Fan; Ma, Haibo; Xu, Weigao; Xia, Xing‐Hua

doi:10.1002/anie.202207300

Cited by 7 publications

(2 citation statements)

References 53 publications

(3 reference statements)

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“…Similarly, Fan et al [73] employed a simple effective method to enhance the photocatalytic H 2 evolution of CdSe QDs; after the surface modification with partial coverage of ZnS, the CdSe QDs exhibited high photocatalytic activity with a H 2 generation rate of 306.3 µmol mg −1 •h −1 . Li et al [74] reported that the fluorescence efficiency of molybdenum disulfide quantum dots (MoS 2 QDs) could be improved by monoatomic metal (Au, Ag, Pt, Cu) modification, and the fluorescence emission of MoS 2 QDs was enhanced by a factor of 4 under monoatomic Au modification.…”

Section: Single-semiconductor Qds As Photocatalystmentioning

confidence: 99%

Application of Quantum Dots for Photocatalytic Hydrogen Evolution Reaction

Gui,

Lu,

Wang

et al. 2024

Applied Sciences

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There is increased interest in the conversion of solar energy into green chemical energy because of the depletion of fossil fuels and their unpleasant environmental effect. Photocatalytic hydrogen generation from water involves the direct conversion of solar energy into H2 fuels, which exhibits significant advantages and immense promise. Nevertheless, photocatalytic efficiency is considerably lower than the standard range of industrial applications. Low light absorption efficiency, the rapid recombination of photogenerated electrons and holes, slow surface redox reaction kinetics and low photostability are well known to be key factors negatively affecting photocatalytic hydrogen production. Therefore, to construct highly efficient and stable photocatalysts is important and necessary for the development of photocatalytic hydrogen generation technology. In this review, quantum dots (QDs)-based photocatalysts have emerged with representative achievements. Due to their excellent light-harvesting ability, low recombination efficiency of photogenerated electrons and holes, and abundant surface active sites, QDs have attracted remarkable interest as photocatalysts and/or cocatalyst for developing highly efficient photocatalysts. In this review, the application of QDs for photocatalytic H2 production is emphatically introduced. First, the special photophysical properties of QDs are briefly described. Then, recent progress into the research on QDs in photocatalytic H2 production is introduced, in three types: semiconductor QDs (e.g., CdS, CdMnS, and InP QDs), metal QDs (e.g., Au, Pt and Ag QDs), and MXene QDs and carbon QDs (CDQs). Finally, the challenges and prospects of photocatalytic H2 evolution with QDs in the future are discussed.

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Section: Single-semiconductor Qds As Photocatalystmentioning

confidence: 99%

Application of Quantum Dots for Photocatalytic Hydrogen Evolution Reaction

Gui,

Lu,

Wang

et al. 2024

Applied Sciences

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“…Through monatomic modification and surface functionalization, new defect energy levels would be introduced into the band gap. Surface passivation increases the recombination probability of electrons and holes, improving the PL intensity of QSs . The self-repair of S vacancies induced by an external S source can repair the lattice defects and adjust the electronic state of MoS 2 to improve the PL stability .…”

Section: Introductionmentioning

confidence: 99%

Extremely Enhanced Photoluminescence in MoS₂-Derived Quantum Sheets

Li,

Chen,

Xiao

et al. 2024

ACS Appl. Mater. Interfaces

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Molybdenum disulfide (MoS 2 ) quantum sheets (QSs) are attractive for applications due to their tunable energy band structures and optical and electronic properties. The photoluminescence quantum yield (PLQY) of MoS 2 QSs achieved by mechanical and liquid exfoliation and chemical vapor deposition is low. Some studies have reported that chemical treatment and elemental doping can improve the PLQY of transition metal dichalcogenides (TMDs), but this is limited by complex instruments and reactions. In this study, a heat treatment method based on a polar solvent is reported to improve the PLQY and photoluminescence (PL) intensity of MoS 2 QSs at room temperature. The absolute PLQY of treated MoS 2 QSs is increased to 18.5%, and the PL intensity is increased by a factor of 64. This method is also effective for tungsten disulfide (WS 2 ) QSs. The PL enhancement of QSs is attributed to oxidation of the edges. Such passivation/deformation of MoS 2 QSs facilitates the radiative route rather than the nonradiative route, resulting in extreme enhancement of the PL. Our work could provide novel insights/routes toward the PL enhancement of TMD QSs.

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Single Atom Silver‐Phosphors in Titanosilicate Matrix for Enhanced LED Applications

Romolini,

Sun,

Fron

et al. 2023

Advanced Optical Materials

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Small metal oligomers have gained significant attention due to their exceptional optoelectronic properties and versatile applications, ranging from sensors to imaging and catalysis. However, the need for matrices (silica, zeolites, or metal‐organic frameworks) to prevent aggregation into larger metallic particles reduces their potential applicability in light‐emitting devices (LEDs) due to their poor electrical properties. To address this issue, a novel semiconductor stabilizer, titanosilicate, is proposed as an innovative solution for Ag‐based luminescent materials. These results show that titanosilicate, characterized by high thermochemical stability and well‐defined semiconducting properties, is an ideal scaffold for Ag‐luminescent species. Optical spectroscopic techniques reveal that Ag‐titanosilicates feature an orange fluorescence with a photoluminescence quantum yield reaching 20%. In contrast, a combination of X‐ray diffraction, TEM, and XEOL‐X‐ray absorption spectroscopic techniques show that, unlike zeolites, the luminescent species consist of single Ag atoms. The electroluminescent properties of the proposed Ag‐titanosilicate are further investigated within a conventional LED architecture by using the new material as an emissive layer. The developed proof‐of‐concept LED exhibits a significant improvement of the ZEOLEDs, where a smaller low turn‐on voltage of 2 V (enabling energy‐efficient operation) and high color rendering index of 80 introduces exciting prospects for developing advanced Ag‐LED phosphors.

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Suppressing Non‐Radiative Relaxation through Single‐Atom Metal Modification for Enhanced Fluorescence Efficiency in Molybdenum Disulfide Quantum Dots

Cited by 7 publications

References 53 publications

Application of Quantum Dots for Photocatalytic Hydrogen Evolution Reaction

Application of Quantum Dots for Photocatalytic Hydrogen Evolution Reaction

Extremely Enhanced Photoluminescence in MoS₂-Derived Quantum Sheets

Single Atom Silver‐Phosphors in Titanosilicate Matrix for Enhanced LED Applications

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Suppressing Non‐Radiative Relaxation through Single‐Atom Metal Modification for Enhanced Fluorescence Efficiency in Molybdenum Disulfide Quantum Dots

Cited by 7 publications

References 53 publications

Application of Quantum Dots for Photocatalytic Hydrogen Evolution Reaction

Application of Quantum Dots for Photocatalytic Hydrogen Evolution Reaction

Extremely Enhanced Photoluminescence in MoS2-Derived Quantum Sheets

Single Atom Silver‐Phosphors in Titanosilicate Matrix for Enhanced LED Applications

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Product

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Extremely Enhanced Photoluminescence in MoS₂-Derived Quantum Sheets