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Issue 24, 2014
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Light upconversion by triplet–triplet annihilation in diphenylanthracene-based copolymers

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Abstract

Low-power light upconversion by triplet–triplet annihilation (TTA-UC) was only recently achieved in glassy materials. Here, a new strategy based on covalent tethering of diphenylanthracene (DPA) emitters to a polymeric backbone is reported. The design aims to optimize the efficiency of this photophysical process in glassy polymeric materials by increasing the emitter content. To that end, DPA molecules were covalently attached to a methacrylate-type monomer and further copolymerized with methylmethacrylate (MMA). Green-to-blue (543 to 440 nm) upconversion was observed at power densities as low as 32 mW cm−2 in films prepared by solution casting and compression molding (co)polymers containing 8–72 wt% of DPA and palladium octaethyl porphyrin (PdOEP) as a sensitizer (0.03–0.7 wt%). The upconversion intensity was studied as a function of DPA and PdOEP contents and the results suggest that upconversion is optimal for DPA and PdOEP weight fractions of 34 and 0.05 wt% respectively.

Graphical abstract: Light upconversion by triplet–triplet annihilation in diphenylanthracene-based copolymers

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Publication details

The article was received on 03 Jul 2014, accepted on 08 Sep 2014 and first published on 08 Sep 2014


Article type: Communication
DOI: 10.1039/C4PY00920G
Citation: Polym. Chem., 2014,5, 6898-6904
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    Light upconversion by triplet–triplet annihilation in diphenylanthracene-based copolymers

    S. H. Lee, M. A. Ayer, R. Vadrucci, C. Weder and Y. C. Simon, Polym. Chem., 2014, 5, 6898
    DOI: 10.1039/C4PY00920G

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