Room temperature triplet state spectroscopy of organic semiconductors
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Baldo_Room temperature.pdf
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991.36 KB
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Adobe PDF
Checksum (MD5)
20e7ade3d7775768eba398b8161b7df1
Author(s)
Reineke, Sebastian
Baldo, Marc A.
Date Issued
January 2014
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Reineke, Sebastian, and Marc A. Baldo. “Room Temperature Triplet State Spectroscopy of Organic Semiconductors.” Sci. Rep. 4 (January 21, 2014).
Version
Final published version
Abstract
Organic light-emitting devices and solar cells are devices that create, manipulate, and convert excited states in organic semiconductors. It is crucial to characterize these excited states, or excitons, to optimize device performance in applications like displays and solar energy harvesting. This is complicated if the excited state is a triplet because the electronic transition is ‘dark’ with a vanishing oscillator strength. As a consequence, triplet state spectroscopy must usually be performed at cryogenic temperatures to reduce competition from non-radiative rates. Here, we control non-radiative rates by engineering a solid-state host matrix containing the target molecule, allowing the observation of phosphorescence at room temperature and alleviating constraints of cryogenic experiments. We test these techniques on a wide range of materials with functionalities spanning multi-exciton generation (singlet exciton fission), organic light emitting device host materials, and thermally activated delayed fluorescence type emitters. Control of non-radiative modes in the matrix surrounding a target molecule may also have broader applications in light-emitting and photovoltaic devices.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs 3.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/srep03797
