Kinetic insight into bimolecular upconversion: experiment and simulation

We demonstrate a transient rate model for photochemical upconversion that links the internal energy transfer and triplet–triplet annihilation processes to spectroscopically measurable quantities, such as delayed fluorescence and bleaching. We confirm that our model is able to reproduce published del...

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Bibliographic Details
Published inRSC advances Vol. 4; no. 16; pp. 8059 - 8063
Main Authors Piper, Roland B., Yoshida, Megumi, Farrell, Daniel J., Khoury, Tony, Crossley, Maxwell J., Schmidt, Timothy W., Haque, Saif A., Ekins-Daukes, N. J.
Format Journal Article
LanguageEnglish
Published 2014
Subjects
Absorption spectroscopy
Bleaching
Emittance
Energy transfer
Fluorescence
Internal energy
Photochemical
Upconversion
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Summary:We demonstrate a transient rate model for photochemical upconversion that links the internal energy transfer and triplet–triplet annihilation processes to spectroscopically measurable quantities, such as delayed fluorescence and bleaching. We confirm that our model is able to reproduce published delayed fluorescence measurements extremely well. We then use transient absorption spectroscopy to directly observe the dynamics of triplet populations through clear observation of delayed bleaching of the emitter species, providing direct evidence of triplet energy transfer from sensitiser to emitter molecules. This more complex experiment is also well reproduced by our model.
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ISSN:2046-2069
2046-2069
DOI:10.1039/C3RA46953K