Light-Generating CdSe/CdS Colloidal Quantum Dot-Doped Plastic Optical Fibers
| Autor: | Charles W. Fortier, Olivier-Michel Tardif, Claudine Nì. Allen, Younes Messaddeq, Arthur Perret, Luc Beaulieu, Sébastien Lamarre, Steeve Morency, Dominic Larivière, Carly A. Whittaker |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Optical fiber FOS: Physical sciences Nanotechnology 02 engineering and technology Applied Physics (physics.app-ph) 010402 general chemistry 01 natural sciences law.invention Nanomaterials Colloid law General Materials Science chemistry.chemical_classification Condensed Matter - Materials Science Nanocomposite Doping Materials Science (cond-mat.mtrl-sci) Physics - Applied Physics Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Quantum dot 0210 nano-technology Glass transition Physics - Optics Optics (physics.optics) |
| DOI: | 10.48550/arxiv.2006.04015 |
| Popis: | Colloidal quantum dots (cQDs) are now a mature nanomaterial with optical properties customizable through varying size and composition. However, their use in optical devices is limited as they are not widely available in convenient forms such as optical fibers. With advances in polymerization methods incorporating nanocrystals, nanocomposite materials suitable for processing into high quality hybrid active fibers can be achieved. We demonstrate a plastic optical fiber fabrication method which ensures homogeneous dispersion of cQDs within a polymer core matrix. Loading concentrations between 10$^{11}$-10$^{13}$ CdSe/CdS cQDs per cm$^{3}$ in polystyrene were electronically imaged, confirming only sporadic sub-wavelength aggregates. Rayleigh scattering losses are therefore dominant at energies below the semiconductors' band gap, but are overtaken by a sharp CdS-related absorption onset around 525 nm facilitating cQD excitation. The redshifted photoluminescence emission is then minimally reabsorbed along the fiber with a spectrum barely affected by the polymerization and a quantum yield staying at $\sim$65$\%$ of its initial value. The latter, along with the glass transition temperature and refractive index, is independent of the cQD concentration hence yielding a proportionally increasing light output. Our cQD-doped fibers are photostable to within 5$\%$ over days showing great promise for functional material applications. Comment: Submitted to ACS Applied Nano Materials |
| Databáze: | OpenAIRE |
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