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Correlation of size and photoluminescence of single CdSe/ZnS quantum dots
KTH, School of Information and Communication Technology (ICT).
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this thesis the correlation between size and emission wavelength of single CdSe/ZnS quantum dots (QDs) has been studied. Based on the quantum confinement model QDs of different size emit light of different wavelength. In order to characterize individual QDs, experiments were carried out using a high-resolution atomic force microscope (AFM) placed on top of an inverted optical microscope. The quantum dots were exited with a high-power diode laser (405 nm) and the spectral response was recorded with a CCD camera attached to a spectrometer. Samples with two different average-sized QDs exhibiting photoluminescence maximum at 600 and 621 nm were prepared by spin-coating a highly diluted QD/toluene solution on cleaned glass cover slides. The results of this thesis verify the theoretical prediction and show on single particle level that with decreasing QD size the emission energy increases.

Place, publisher, year, edition, pages
2012. , 72 p.
Trita-ICT-EX, 2012:121
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-99562OAI: diva2:542421
Available from: 2012-08-02 Created: 2012-08-01 Last updated: 2012-08-02Bibliographically approved

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