Efforts to fabricate low-power upconverting solid-state systems have rapidly increased in the past decade because of their possible application in several fields such as bio-imaging, drug delivery, solar harvesting or displays. The synthesis of upconverting cross-linked polyester rubbers with covalently tethered chromophores is presented here. Cross-linked films were prepared by reacting a poly(mannitol-sebacate) pre-polymer with 9,10-bis(4-hydroxymethylphenyl) anthracene (DPA-(CH2OH)2) and palladium mesoporphyrin IX. These chromophores served as emitters and sensitizers, respectively, and through a cascade of photophysical events, resulted in an anti-Stokes shifted emission. Indeed, blue emission (~440 nm) of these solid materials was detected upon excitation at 543 nm with a green laser and the power dependence of integrated upconverted intensity versus excitation was examined. The new materials display upconversion at power densities as low as 32 mW/cm2, and do not display phase de-mixing, which has been identified as an obstacle in rubbery blends comprising untethered chromophores.
ToC Low-power upconverting cross-linked polyester with tethered chromophores was synthesized by polycondensation of poly(mannitol-sebacate) pre-polymers with 9,10-bis(4-hydroxymethylphenyl) anthracene and palladium mesoporphyrin IX. Upconverted blue fluorescence (440 nm) of these solid materials is detected upon excitation at 543 nm with a green laser and the power dependence of integrated upconverted intensity versus excitation is examined in this study.
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The authors are thankful for the financial support of the Swiss National Science Foundation (200021_13540/1 and 200020_152968), Spanish Ministry of Economy and Competitiveness (Project MAT2010/21494-C03) and the Adolphe Merkle Foundation. The authors thank Prof. Christoph Weder for his help and support.
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Lee, S., Sonseca, Á., Vadrucci, R. et al. Low-Power Upconversion in Poly(Mannitol-Sebacate) Networks with Tethered Diphenylanthracene and Palladium Porphyrin. J Inorg Organomet Polym 24, 898–903 (2014). https://doi.org/10.1007/s10904-014-0063-7
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