Efficient photon upconversion at remarkably low annihilator concentrations in a liquid polymer matrix: when less is more

Durandin, Nikita A.; Isokuortti, Jussi; Efimov, Alexander; Vuorimaa-Laukkanen, Elina; Tkachenko, Nikolai V.; Laaksonen, Timo (2018)
 
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Durandin, Nikita A.
Isokuortti, Jussi
Efimov, Alexander
Vuorimaa-Laukkanen, Elina
Tkachenko, Nikolai V.
Laaksonen, Timo
2018

Chemical Communications
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doi:10.1039/c8cc07592a
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https://urn.fi/URN:NBN:fi:tty-201901141089

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<p>A green-to-blue triplet-triplet annihilation upconversion of 24.5% quantum yield was achieved at a remarkably low 600 μM annihilator concentration in a viscous polymer matrix. This was made possible by utilizing a ZnTPP-based photosensitizer with exceptionally long 11 ms phosphorescence lifetime. Higher 3 mM annihilator concentration resulted in lower 24% upconversion quantum yield.</p>
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