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- W2113183709 abstract "The mechanisms of noncoherent photon upconversion that involve triplet−triplet annihilation (TTA) in solution have been investigated for two model systems. ZnTPP (meso-tetraphenylporphine zinc) is used as the model visible light-absorbing metalloporphyrin because its S1 fluorescence intensity can be used to monitor the initial rate of porphyrin triplet state production and because its S2 fluorescence intensity can be used as a direct measure of the rate of porphyrin TTA. When perylene, which has a triplet energy lower than that of ZnTPP, is added as a signaling blue emitter (BE), the mechanism of photon upconversion involves triplet energy transfer from the porphyrin to the BE followed by TTA in the BE to form the fluorescent perylene S1 state. The kinetics of this process have been characterized and are unremarkable. When coumarin 343 (C343), which has photophysical properties similar to those of perylene except that it has a much higher triplet energy than ZnTPP, is added as the signaling BE, emission from the ZnTPP S2 state is quenched and fluorescence from the C343 grows in. Contrary to previous suggestions, the mechanism of photon upconversion in this system does not involve singlet energy transfer from the porphyrin S2 state to the BE. Instead, ground-state C343 complexes with the ZnTPP triplet to form a triplet exciplex, which then undergoes TTA with a second ZnTPP triplet to give the fluorescent state of the BE in a three-center process." @default.
- W2113183709 created "2016-06-24" @default.
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- W2113183709 creator A5088699980 @default.
- W2113183709 date "2009-07-02" @default.
- W2113183709 modified "2023-09-26" @default.
- W2113183709 title "Mechanisms of Low-Power Noncoherent Photon Upconversion in Metalloporphyrin−Organic Blue Emitter Systems in Solution" @default.
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- W2113183709 doi "https://doi.org/10.1021/jp9034776" @default.
- W2113183709 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19719312" @default.
- W2113183709 hasPublicationYear "2009" @default.
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