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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Published in:RSC advances 2014, Vol.4 (16), p.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: Article
Language:English
Subjects:
Absorption spectroscopy
Bleaching
Emittance
Energy transfer
Fluorescence
Internal energy
Photochemical
Upconversion
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description 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.
doi_str_mv 10.1039/C3RA46953K
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source Royal Society of Chemistry:Jisc Collections:Royal Society of Chemistry Read and Publish 2022-2024 (reading list)
subjects Absorption spectroscopy
Bleaching
Emittance
Energy transfer
Fluorescence
Internal energy
Photochemical
Upconversion
title Kinetic insight into bimolecular upconversion: experiment and simulation
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