Oxygen accelerated scalable synthesis of highly fluorescent sulfur quantum dots

Song, Yiheng; Tan, Jisuan; Wang, Guan; Gao, Pengxiang; Lei, Jiehao; Zhou, Li

doi:10.1039/c9sc05019a

Cited by 119 publications

(159 citation statements)

References 29 publications

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“…[21] In the past two years, impressive progress has been made in the synthesis of luminescent SQDs from elemental sulfur, including increasing PLQY (from 3.8 % to about 50 %), shortening reaction time (from 125 h to 4 h) and increasing reaction yield (from 0.87 % to 5.08 %). [23][24][25][26][27][28][29][30][31][32] However, considering the practical applications of SQDs, there are still some important issues that need to be addressed. Firstly, the PLQY of SQDs is still much lower than commercially available QDs, such as CdTe QDs and CdSe QDs (generally higher than 50 % and even exceeding 90 %).…”

Section: Ultrasonication and Microwave Preparationmentioning

confidence: 99%

“…[33] Secondly, the emission color of SQDs is limited in the short wavelength region (e.g, blue and green emission), it is still very challenging to synthesize SQDs with red or near infrared emission. [23][24][25][26][27][28][29][30][31][32][33] In addition, overcoming the disadvantage of low reaction yield and achieving high conversion efficiency from elemental sulfur to SQDs for large-scale synthesis of SQDs is a challenge and of great importance.…”

Section: Ultrasonication and Microwave Preparationmentioning

confidence: 99%

“…However, it is difficult to directly confirm the formation of SQDs from HRTEM image because they show similar lattice parameter to that of CQDs. [23,24,34] Powder X-ray diffraction (XRD) measurement, which has been widely employed to distinguish the kind of inorganic materials, cannot give solid evidence for the formation of SQDs too. This is because the wide amorphous peak derived from the high content of organic stabilizer may cover the patterns of SQDs.…”

Section: Structural Characterizationmentioning

confidence: 99%

“…Several papers have reported that the SQDs exhibited similar Raman spectrum to that of sublimated sulfur. [21,24] Besides, the X-ray photoelectron spectroscopy (XPS) S2p spectrum can also provide evidence by the observation of atomic sulfur peak. [21][22][23][24] The XPS S2p peaks in the range of 161- with enlarged spectra of cyan and blue SQDs shown in the inset.…”

Section: Structural Characterizationmentioning

confidence: 99%

“…165 eV usually belong to the characteristic peaks of atomic sulfur. [21][22][23][24] For example, Li et al reported that the peaks at 161.9, 163.2 and 164.3 eV were assigned to the atomic sulfur. [22] Additionally, the binding energy higher than 166 eV generally attributed to the presence of oxidized sulfur species.…”

Section: Structural Characterizationmentioning

confidence: 99%

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Luminescent Sulfur Quantum Dots: Synthesis, Properties and Potential Applications

2020

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Sulfur quantum dots (SQDs) represent a new class of luminescent nanomaterials. They have shown great potential in numerous application fields including sensing, cell imaging, photocatalysis, light emitting diodes and polymer nanocomposites, due to their unique composition, favorable optical properties, low toxicity, fine processability and low cost. This Minire-view summarizes the recent research progress on the synthesis, characterization, properties and applications of SQDs, especially those synthesized from elemental sulfur. Critical yet unsolved issues in the synthesis and applications of SQDs are also discussed. In addition, an outlook for future research trends of SQDs is presented.

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Section: Ultrasonication and Microwave Preparationmentioning

confidence: 99%

Section: Ultrasonication and Microwave Preparationmentioning

confidence: 99%

Section: Structural Characterizationmentioning

confidence: 99%

Section: Structural Characterizationmentioning

confidence: 99%

Section: Structural Characterizationmentioning

confidence: 99%

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Luminescent Sulfur Quantum Dots: Synthesis, Properties and Potential Applications

2020

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Extended Surface Bands Enabled Lasing Emission and Wavelength Switch from Sulfur Quantum Dots

Xiao,

Duan,

Zhou

et al. 2024

Advanced Materials

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The development of a lasing wavelength switch, particularly from a single inorganic gain material, is challenging but highly demanded for advanced photonics. Nonetheless, all current lasing emission of inorganic gain materials arises from band‐edge states, and the inherent fixed bandgap limitation of the band‐edge system leads to the inaccessibility of lasing wavelength switching from a single inorganic gain material. Here the realization of a single inorganic gain material‐based lasing wavelength switch is reported by proposing an alternative lasing emission strategy, that is, lasing emission from surface gain. Previous efforts to achieve surface‐gain‐enabled lasing emission have been hindered by the limited gain volume provided by surface states due to the broad emission bandwidth and/or low emission efficiency. This challenge is overcome by introducing extended surface bands onto the surface of sulfur quantum dots. The extended surface bands contribute to a high photoluminescence quantum yield and narrow emission bandwidth, thereby providing sufficient gain volume and facilitating stimulated emission. When combined with whispering gallery mode microcavity, surface gain enabled lasing emission manifests an ultralow threshold of 8.3 µJ cm−2. Remarkably, the reconfigurable perturbation to surface gain, facilitated by molecular affinity, allows for the realization of the lasing wavelength switch from a single inorganic gain material.

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Towards Efficient White‐light Emission in Sulfur Dots through Surface Charge Engineering

Wang,

Jin

et al. 2024

Angewandte Chemie

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Sulfur dots (SDs) have emerged as promising photoluminescence (PL) materials owing to their intrinsic merits such as abundant electronic effects, outstanding biocompatibility and available photocatalytic activity. Typically based on quantum confinement effects, SDs are reported usually confined emission in blue‐to‐green region. However, it is challenging to achieve their broad emission tunability in the visible region, restricted by inherent band gap of bulk sulfur (ca. 2.79 eV). Herein, we present white‐light‐emitting SDs achieved by surface charge engineering that hybridizes the surface of SDs with oleylamine. The resulting SDs exhibit broadband emissions (full width at half maximum of 187 nm) with PL quantum yields of up to 12.1% and Commission International de I’Eclairage color coordinates of (0.27, 0.32). Detailed experimental and calculation results reveal that the strong orbital coupling between oleylamine and sulfur on the hybrid surfaces of the SDs causes electron delocalization, leading to the generation of low‐energy charge transfer (CT) states. These CT states are highly sensitive to sulfur‐oleylamine hybrid structures, which complicate the transition dynamics and promote multi‐energy emission, accounting for efficient white‐light emission. The demonstration of white‐light SDs based on surface charge engineering is an important step towards the development of sulfur‐based PL materials.

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Oxygen accelerated scalable synthesis of highly fluorescent sulfur quantum dots

Abstract: Highly fluorescent sulfur quantum dots could be rapidly and massively synthesized from inexpensive elemental sulfur under a pure O2 atmosphere.

Cited by 119 publications

References 29 publications

Luminescent Sulfur Quantum Dots: Synthesis, Properties and Potential Applications

Luminescent Sulfur Quantum Dots: Synthesis, Properties and Potential Applications

Extended Surface Bands Enabled Lasing Emission and Wavelength Switch from Sulfur Quantum Dots

Towards Efficient White‐light Emission in Sulfur Dots through Surface Charge Engineering

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