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Observation and Analysis of Blinking Surface-enhanced Raman Scattering
Published on: January 11, 2018
Strain-induced effects in colloidal quantum dots: lifetime measurements and blinking statistics
V Veilleux1, D Lachance-Quirion, K Doré
1Centre d'optique, photonique et laser (COPL), Université Laval, QC, Canada.
Nanotechnology
|March 9, 2010
Summary
Strain in cadmium selenide/cadmium zinc sulfide (CdSe/CdZnS) core/shell quantum dots significantly impacts photoluminescence and blinking. Lattice mismatch influences defects, affecting nanocrystal electronic structure and optical properties.
Area of Science:
- Materials Science
- Nanotechnology
- Quantum Dot Research
Background:
- Colloidal quantum dots (cQDs) are crucial in optoelectronics.
- Understanding strain effects in core/shell cQDs is vital for performance tuning.
Purpose of the Study:
- Investigate lattice-mismatch-induced strain in CdSe/CdZnS core/shell cQDs.
- Determine the influence of strain on photoluminescence (PL) and blinking behavior.
Main Methods:
- Synthesized CdSe/CdZnS core/shell cQDs with varying Zn content.
- Analyzed PL spectra and PL excitation spectra.
- Conducted blinking studies and exciton relaxation lifetime measurements.
Main Results:
- PL spectra showed size-dependent fluorescence wavelength variations.
- PL excitation spectra revealed exciton level splitting with increased Zn and shell growth.
- Blinking behavior significantly depended on Zn content, shifting from power-law to exponential cut-off distributions.
Conclusions:
- Lattice mismatch and strain are critical parameters for nanocrystal electronic structure.
- Strain influences photoluminescence, exciton relaxation lifetime, and blinking behavior in core/shell cQDs.
- Results suggest diffusion-controlled electron transfer mechanisms are involved.
