Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 22, Issue 6, Pages 2060-2067Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201503318
Keywords
crystal phases; photochemistry; photon upconversion; triplet energy migration; triplet-triplet annihilation
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Funding
- Ministry of Education, Culture Sports, Science and Technology of Japan [25220805, 26810036, 26104529]
- JSPS-NSF International Collaborations in Chemistry (ICC) program
- Noguchi Institute
- Grants-in-Aid for Scientific Research [26810036, 15J03077, 26104529] Funding Source: KAKEN
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For real-world applications of photon upconversion based on the triplet-triplet annihilation (TTA-UC), it is imperative to develop solid-state TTA-UC systems that work effectively under low excitation power comparable to solar irradiance. As an approach in this direction, aromatic crystals showing high triplet diffusivity are expected to serve as a useful platform. However, donor molecules inevitably tend to segregate from the host acceptor crystals, and this inhomogeneity results in the disappointing performance of crystalline state TTA-UC. In this work, a series of cast-film-forming acceptors was developed, which provide both regular acceptor alignment and soft domains of alkyl chains that accommodate donor molecules without segregation. A typical triplet sensitizer, Pt-II octaethylporphyrin (PtOEP), was dispersed in these acceptor crystals without aggregation. As a result, efficient triplet energy transfer from the donor to the acceptor and diffusion of triplet excitons among regularly aligned anthracene chromophores occurred. It resulted in TTA-UC emission at low excitation intensities, comparable to solar irradiance.
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