Journal article

Revealing the influence of steric bulk on the triplet-triplet annihilation upconversion performance of conjugated polymers

Riley O'shea, William J Kendrick, Can Gao, Tze Cin Owyong, Jonathan M White, Kenneth P Ghiggino, Wallace WH Wong

SCIENTIFIC REPORTS | NATURE PORTFOLIO | Published : 2021

Abstract

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 t..

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