Revealing the influence of steric bulk on the triplet-triplet annihilation upconversion performance of conjugated polymers
AuthorO'shea, R; Kendrick, WJ; Gao, C; Owyong, TC; White, JM; Ghiggino, KP; Wong, WWH
Source TitleScientific Reports
AffiliationSchool of Chemistry
Document TypeJournal Article
CitationsO'shea, R., Kendrick, W. J., Gao, C., Owyong, T. C., White, J. M., Ghiggino, K. P. & Wong, W. W. H. (2021). Revealing the influence of steric bulk on the triplet-triplet annihilation upconversion performance of conjugated polymers. SCIENTIFIC REPORTS, 11 (1), https://doi.org/10.1038/s41598-021-99179-y.
Access StatusOpen Access
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.
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