Near-Infrared Emitting Fibers: Stable Jet Electrospinning Flat PbSe Quantum Dots into Poly(methyl methacrylate)

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Flat colloidal quantum dots (fQDs) are 2D nanomaterials with tunable near-infrared (NIR) photoluminescence.
• Their properties make them suitable for fiber-based applications due to emission within low-loss optical fiber windows.
• Integrating these QDs into stable matrices is crucial for practical device implementation.

Purpose of the Study:

• To incorporate lead selenide flat colloidal quantum dots (PbSe fQDs) into functional and stable polymer fibers.
• To investigate the photoluminescent properties of PbSe fQDs within an electrospun fiber matrix.
• To advance the development of NIR-emitting nanomaterials for fiber optics.

Main Methods:

• Jet electrospinning of poly(methyl methacrylate) (PMMA) fibers containing PbSe fQDs.
• Characterization of the morphology and alignment of PbSe fQDs within the fibers.
• Photoluminescence spectroscopy to analyze emission properties (wavelength, quantum yield).

Main Results:

• Successfully embedded PbSe fQDs into stable PMMA fibers via electrospinning.
• Observed perpendicularly aligned stacks of PbSe fQDs within the nanocomposite fibers.
• Achieved narrowed and red-shifted photoluminescence at 1073 nm with a 5% quantum yield, attributed to energy transfer effects.

Conclusions:

• Embedding PbSe fQDs into solid-state nanocomposite fibers is a viable strategy for fiber-optic applications.
• The aligned fQD structures enhance NIR emission properties.
• This work is a significant step towards utilizing 2D lead chalcogenide nanocrystals in optical fiber technology.