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

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Original languageEnglish
Pages (from-to)14029-14032
Number of pages4
JournalChemical Communications
Issue number99
Publication statusPublished - 2018
Publication typeA1 Journal article-refereed


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.


  • triplet-triplet annihilation, triplet-triplet energy transfer, triplet state lifetime, upconversion, triplet fusion

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Field of science, Statistics Finland

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