A highly luminescent quantum dot/mesoporous TiO2 nanocomplex film under controlled energy transfer

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We have prepared a highly luminescent quantum dot (QDs)-TiO2 nanocomplex film by the dip coating method. Because QDs with 3-mercaptopropionic acid as a ligand adsorb ionized Ti+ cations on the TiO2 particle, the average distance between the QDs can be changed through controlling the porosity in the film. The porosity is controlled using ethyl cellulose (EC). EC is the best material for well dispersing the hydroxyl functional group (-OH) in the chemical structure, and forming pores inside the film under the decomposition temperature (above 698 degrees F). As the porosity decreases, the average decay time controlled by the porosity increases to the maximum 91.2 ns. On the other hand, the amount of QDs decreased to 50%, hindering the increase of photo-luminescence (PL) intensity. Through this result, we have found that the PL intensity of the QD films is strongly related to the amount of the QDs and the resolution of aggregation. Consequently, we have optimized the porosity of the film and obtained high PL intensities up to approximately 17 times.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2019-07
Language
English
Article Type
Article
Citation

NANOSCALE, v.11, no.28, pp.13219 - 13226

ISSN
2040-3364
DOI
10.1039/c9nr01044k
URI
http://hdl.handle.net/10203/263958
Appears in Collection
MS-Journal Papers(저널논문)
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