Disentangling Multiple Effects on Excited State Intramolecular Charge Transfer among Asymmetrical Tripartite PPI-TPA/PCz Triads

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

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Author(s)

  • Sirui Yang
  • Amjad Islam
  • Shanshan Sun
  • Ziqian Deng
  • Jiayu Li
  • Shaofei Ni
  • Qing-Xiao Tong
  • Ming-De Li

Detail(s)

Original languageEnglish
Pages (from-to)1337-1345
Journal / PublicationChemistry - A European Journal
Volume27
Issue number4
Online published9 Aug 2020
Publication statusPublished - 18 Jan 2021

Abstract

By utilizing the bipolarity of 1,2‐diphenylphenanthroimidazole (PPI), two types of asymmetrical tripartite triads (PPI‐TPA and PPI‐PCz) have been designed with triphenylamine (TPA) and 9‐phenyl‐ carbazole (PCz), respectively. These triads are the deep‐blue luminescent materials with a high fluorescence quantum yield of nearly 100%. To trace the photophysical behaviors of these novel triads, the excited states evolution channels and interchromophoric interactions of these triads were investigated by ultrafast time‐resolved transient absorption and excited states theoretical calculations. The results suggest that the electronic nature of moieties, asymmetrical tripartite structure and the distance of electron‐hole of these triads as well as the polarity of solvent determine the lifetime of intramolecular charge transfer (ICT). Interestingly, PPI‐PCz triads demonstrate an anti‐Kasha’s ICT, the charge transfer direction among the triads is adjustable. For PPI‐TPA triad, the electron is transferred from TPA to PPI, while for PPI‐PCz triads, the electron is pushed from PPI into PCz moiety. The exploration on the excited state ICT among these triads may pave the way to design a better luminescent material in the future.

Research Area(s)

  • Intramolecular charge transfer, OLED, Excited states, Donor and acceptor, triads

Citation Format(s)

Disentangling Multiple Effects on Excited State Intramolecular Charge Transfer among Asymmetrical Tripartite PPI-TPA/PCz Triads. / Yang, Sirui; Cao, Chen; Islam, Amjad et al.

In: Chemistry - A European Journal, Vol. 27, No. 4, 18.01.2021, p. 1337-1345.

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