학술논문
Revealing the influence of steric bulk on the triplet–triplet annihilation upconversion performance of conjugated polymers
Document Type
article
Author
Source
Scientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
Subject
Language
English
ISSN
2045-2322
Abstract
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 the copolymer containing 10% monomer with bulky sidechains.