School of Chemistry - Research Publications

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Author: White, Jonathan × Author: Ghiggino, Kenneth × Author: Owyong, Tze Cin × Start date: 2020 × End date: 2022 ×

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    Limitations of conjugated polymers as emitters in triplet-triplet annihilation upconversion
    O'shea, R ; Gao, C ; Bradley, S ; Owyong, TC ; Wu, N ; White, JM ; Ghiggino, KP ; Wong, WWH (ROYAL SOC CHEMISTRY, 2021-11-29)
    Triplet–triplet annihilation upconversion performances for poly(phenylene-vinylene) emitters were investigated through a series of copolymers with bulky sidechains.
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    Revealing the influence of steric bulk on the triplet-triplet annihilation upconversion performance of conjugated polymers
    O'shea, R ; Kendrick, WJ ; Gao, C ; Owyong, TC ; White, JM ; Ghiggino, KP ; Wong, WWH (NATURE PORTFOLIO, 2021-10-01)
    A series of poly(phenylene-vinylene)-based copolymers are synthesized using the Gilch method incorporating monomers with sterically bulky sidechains. The photochemical upconversion performance of these polymers as emitters are investigated using a palladium tetraphenyltetrabenzoporphyrin triplet sensitizer and MEH-PPV as reference. Increased incorporation of sterically bulky monomers leads to a reduction in the upconversion efficiency despite improved photoluminescence quantum yield. A phosphorescence quenching study indicates issues with the energy transfer process between the triplet sensitizer and the copolymers. The best performance with 0.18% upconversion quantum yield is obtained for the copolymer containing 10% monomer with bulky sidechains.