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

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 sen...

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Detalles Bibliográficos
Autores principales: O’shea, Riley, Kendrick, William J., Gao, Can, Owyong, Tze Cin, White, Jonathan M., Ghiggino, Kenneth P., Wong, Wallace W. H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8486830/
https://www.ncbi.nlm.nih.gov/pubmed/34599257
http://dx.doi.org/10.1038/s41598-021-99179-y
Descripción
Sumario: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.