Direct Observation of an Efficient Triplet Exciton Diffusion Process in a Platinum-Containing Conjugated Polymer

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Lili Du
  • Wenjuan Xiong
  • Shun-Cheung Cheng
  • Haiting Shi
  • Wai Kin Chan
  • And 1 others
  • David Lee Phillips

Detail(s)

Original languageEnglish
Pages (from-to)2475-2479
Journal / PublicationJournal of Physical Chemistry Letters
Volume8
Issue number11
Publication statusPublished - 1 Jun 2017

Abstract

We report the synthesis and characterization of a conjugated polymer incorporated with cyclometalated platinum complexes on the main chain. The polymer may serve as an efficient triplet sensitizer in light-harvesting systems. The photophysical properties of the polymer were studied by nanosecond and femtosecond time-resolved transient absorption spectroscopies. After excitation, an energy-transfer process from the thiophene units on the conjugated main chain to the singlet excited state of the Pt complex moieties occurred in less than 150 fs. The subsequent intersystem crossing process resulted in the formation of a triplet excited state at the Pt complex moieties in ∼3.2 ps, which was then followed by an efficient triplet diffusion process that led to the formation of triplet excitons on the polymer main chain in ∼283 ps. This proposed efficient triplet sensitized polymer system not only enhances the exciton diffusion length but also reduces energy loss in the process, which displays remarkable implications in the design of novel materials for triplet sensitized solar cells.

Citation Format(s)

Direct Observation of an Efficient Triplet Exciton Diffusion Process in a Platinum-Containing Conjugated Polymer. / Du, Lili; Xiong, Wenjuan; Cheng, Shun-Cheung; Shi, Haiting; Chan, Wai Kin; Phillips, David Lee.

In: Journal of Physical Chemistry Letters, Vol. 8, No. 11, 01.06.2017, p. 2475-2479.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review