Macrocrystals of colloidal quantum dots in anthrancene: exciton trannsfer and polarized emission

Date
2015
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Source Title
Journal of Physical Chemistry Letters
Print ISSN
1948-7185
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Publisher
American Chemical Society
Volume
6
Issue
9
Pages
1767 - 1772
Language
English
Type
Article
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Abstract

In this work, centimeter-scale macrocrystals of nonpolar colloidal quantum dots (QDs) incorporated into anthracene were grown for the first time. The exciton transfer from the anthracene host to acceptor QDs was systematically investigated, and anisotropic emission from the isotropic QDs in the anthracene macrocrystals was discovered. Results showed a decreasing photoluminescence lifetime of the donor anthracene, indicating a strengthening energy transfer with increasing QD concentration in the macrocrystals. With the anisotropy study, QDs inside the anthracene host acquired a polarization ratio of similar to 1.5 at 0 degrees collection angle, and this increases to similar to 2.5 at the collection angle of 60 degrees. A proof-of-concept application of these excitonic macrocrystals as tunable color converters on light-emitting diodes was also demonstrated.

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Keywords
Light - emitting - diodes, Resonance Energy - transfer, Single - crystals, Organic - molecules, Derivatives, Nanocrystals, Harvesters, Displays
Citation
Published Version (Please cite this version)