ArticleScientific reports2015
Tunability Limit of Photoluminescence in Colloidal Silicon Nanocrystals.
Article in Scientific reports, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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Who cites it
11 citing papers in PubMed.
- MnSb-Based Quantum Dots: Defect-Mediated Photoluminescence in Multiphase Nanostructures via Green Colloidal Synthesis.ACS omega · 2026Article
- Development of Time-Resolved Luminescence Measurement Instruments for Biosensing and Bioimaging - An Overview.Measurement : journal of the International Measurement Confederation · 2025Article
- Förster Resonance Energy Transfer and Enhanced Emission in CsNanomaterials (Basel, Switzerland) · 2024Article
- Enhanced Photoluminescence and Prolonged Carrier Lifetime through Laser Radiation Hardening and Self-Healing in Aged MAPbBrMicromachines · 2023Article
- Article
- Study of the Effect of Nitric Acid in Electrochemically Synthesized Silicon Nanocrystals: Tunability of Bright and Uniform Photoluminescence.Nanomaterials (Basel, Switzerland) · 2022Article
- Dextran mediated MnFeRSC advances · 2021Article
- Aerosol-Phase Synthesis and Processing of Luminescent Silicon Nanocrystals.Chemistry of materials : a publication of the American Chemical Society · 2019Article
- Energy/Electron Transfer Switch for Controlling Optical Properties of Silicon Quantum Dots.Scientific reports · 2018Article
- Tuning the Optical Properties of Silicon Quantum Dots via Surface Functionalization with Conjugated Aromatic Fluorophores.Scientific reports · 2018Article
- Reply to 'Absence of redshift in the direct bandgap of silicon nanocrystals with reduced size'.Nature nanotechnology · 2017Article
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Authors and funding
10 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Luminescent silicon nanocrystals (Si NCs) have attracted tremendous research interest. Their size dependent photoluminescence (PL) shows great promise in various optoelectronic and biomedical applications and devices. However, it remains unclear why the exciton emission is limited to energy below 2.1 eV, no matter how small the nanocrystal is. Here we interpret a nanosecond transient yellow emission band at 590 nm (2.1 eV) as a critical limit of the wavelength tunability in colloidal silicon nanocrystals. In the "large size" regime (d > ~3 nm), quantum confinement dominantly determines the PL wavelength and thus the PL peak blue shifts upon decreasing the Si NC size. In the "small size" regime (d < ~2 nm) the effect of the yellow band overwhelms the effect of quantum confinement with distinctly increased nonradiative trapping. As a consequence, the photoluminescence peak does not exhibit any additional blue shift and the quantum yield drops abruptly with further decreasing the size of the Si NCs. This finding confirms that the PL originating from the quantum confined core states can only exist in the red/near infrared with energy below 2.1 eV; while the blue/green PL originates from surface related states and exhibits nanosecond transition.
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