1 December 1997 Photoluminescence in poly(3-hexylthiophene)
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We report a study of the photophysics of solutions and films of the conjugated polymer poly(3-hexylthiophene) (P3HT). We have performed measurements of absorption, photoluminescence (PL), PL quantum yield, and time-resolved PL. For P3HT in a good solvent the PL decays with a time constant of 510 +/- 20 ps, and the PL quantum yield is 0.42 +/- 0.04, we assign the PL to the intra-chain singlet exciton, and deduce a natural radiative lifetime for this species of 1.2 +/- 0.1 ns. We explore the use of solvent mixture as a way of controlling the degree of intermolecular interaction. We find that there is a red-shift of absorption and PL in poor solvent mixtures, and the spectra and PL quantum yield become similar to the film. The PL decay becomes faster and non-exponential in poor solvent mixtures and the thin film.
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Ifor D. W. Samuel, Ifor D. W. Samuel, Laura Magnani, Laura Magnani, Garry Rumbles, Garry Rumbles, Ken Murray, Ken Murray, Bradley M. Stone, Bradley M. Stone, Stephen C. Moratti, Stephen C. Moratti, Andrew B. Holmes, Andrew B. Holmes, } "Photoluminescence in poly(3-hexylthiophene)", Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997); doi: 10.1117/12.279277; https://doi.org/10.1117/12.279277

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