ArticleThe journal of physical chemistry letters2026
Photon Up-Conversion Process to Test Media Ordering.
Article in The journal of physical chemistry letters, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
In this work, triplet-triplet annihilation upconversion (TTA-UC) was employed as a sensitive tool to study the influence of media organization on the efficiency of bimolecular processes. For this purpose, an archetypal sensitizer/emitter pair of platinum octaethylporphyrin (PtOEP) and 9,10-diphenylanthracene (DPA) was probed in oleic (OA) and elaidic acid (EA), chosen as isomeric phase change materials (PCMs). TTA-UC was monitored below and above the melting points of the PCMs. The results point out that the arrangement of solid- and liquid-phase media imposes constraints able to assist TTA-UC, resulting in higher efficiency in the solid phase of OA. A green-to-blue UC quantum yield of up to 3.6% was observed under ambient conditions with incoherent and low power excitation. The role and the effects of media constraints were monitored through steady-state and time-resolved luminescence, small-angle X-ray scattering (SAXS), Raman and UV-vis spectroscopy and were rationalized in terms of PtOEP aggregation.
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