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Journal of Nanoparticle Research

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01-12-2015 | Research Paper

Generation of fluorescent CdSe nanocrystals by short-pulse laser fragmentation

Authors: Yu. T. Zholudov, C. L. Sajti, N. N. Slipchenko, B. N. Chichkov

Published in: Journal of Nanoparticle Research | Issue 12/2015

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Abstract

A simple liquid-phase laser fragmentation approach, resulting in the rapid transformation of CdSe microcrystals into colloidal quantum dots (QDs), is presented. Laser fragmentation is achieved by irradiating a CdSe suspension in dimethylformamide with intense infrared, picosecond laser pulses followed by surface passivation with oleylamine or different types of phosphines. The generated QDs reveal perfect colloidal stability preventing agglomeration and precipitation, and show characteristic QD absorption and fluorescence characteristics, whereas their emission properties strongly depend on the surface states and applied capping ligands. These QDs show distinct photoemission under 405-nm single-photon and 800-nm multi-photon excitations in the 560- to 610-nm spectral region corresponding to the QDs size of about 1.5–2 nm in diameter which is confirmed by transmission electron microscopy.

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Title: Generation of fluorescent CdSe nanocrystals by short-pulse laser fragmentation
Authors: Yu. T. Zholudov
C. L. Sajti
N. N. Slipchenko
B. N. Chichkov
Publication date: 01-12-2015
Publisher: Springer Netherlands
Published in: Journal of Nanoparticle Research / Issue 12/2015
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-015-3303-z

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