Authors
Sakura Nakagawa, Naoto Matsumoto, Masanori Uji, Maria-Sophie Bertrams, Christoph Kerzig, Nobuhiro Yanai
Published in
Angewandte Chemie (International ed. in English). Pages e3019584. Aug 05, 2026. Epub Aug 05, 2026.
Abstract
Triplet-triplet annihilation-based photon upconversion (TTA-UC) expands the accessible spectral window for photochemical transformations by generating high-energy photons from low-energy excitation. Although TTA-UC has been widely demonstrated in solution and in various solid-state formats, examples of polymer materials capable of efficient visible-to-ultraviolet (vis-to-UV) upconversion under low excitation intensities remain scarce. Achieving vis-to-UV TTA-UC in a porous solid is particularly challenging because it requires balancing chromophore proximity for TTA with the suppression of aggregation-induced quenching, while simultaneously preserving substrate accessibility. Here, we introduce porous polymer monoliths that enable solid-state TTA-UC specifically designed for heterogeneous photochemistry. By embedding sensitizer-annihilator dye pairs into polymer matrices with controlled co-continuous porosity, we create monolithic architectures that display upconverted UV emission from blue light at excitation intensities below a few mW cm- 2, with the operational wavelength further extended to green light excitation. The porous architecture enhances energy transfer to reaction substrates, providing a versatile platform for heterogeneous photochemical processes. Owing to their robustness and tunability, these monoliths are promising candidates as heterogeneous photoreactors, opening new opportunities for scalable and sustainable photochemistry.
PMID:
42554524
Bibliographic data and abstract were imported from PubMed on 05 Aug 2026.
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