期刊
FLUORESCENCE METHODS AND APPLICATIONS: SPECTROSCOPY, IMAGING, AND PROBES
卷 1130, 期 -, 页码 235-241出版社
WILEY-BLACKWELL
DOI: 10.1196/annals.1430.021
关键词
quantum dot; nanocrystal; semiconductor; fluorescence; quantum yield; CdSe; CdSe-ZnS; shell; ZnS shell; stability; stability test
We investigated the correlation between the thickness of the ZnS shell of CdSe-ZnS quantum dots (QDs), the stability of the particles, and the fluorescence quantum yield. As a measure for stability, a new shell quality test was developed. This test is based on the reaction of the QDs with photochemically formed thiophenol radicals and communicates an imperfect ZnS shell by a rapid and complete loss of fluorescence. The quantum yield increases from less than 5% for unshelled CdSe up to 50%, with an increase in ZnS shell thickness up to 0.6-0.8 nm. At the same time, the particles become significantly more stable, as revealed by the shell test.
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