A novel white-light-emitting conjugated polymer derived from polyfluorene with a hyperbranched structure

Jing Sun, Junli Yang, Chongyang Zhang, Hua Wang, Jie Li, Shijian Su, Huixia Xu, Tiaomei Zhang, Yuling Wu, Wai Yeung Wong, Bingshe Xu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

31 Citations (Scopus)

Abstract

A series of novel hyperbranched conjugated polymers containing red phosphorescent iridium complexes that produce white-light emission have been designed and synthesized. The iridium complexes, tris[1-phenylisoquinolinato-C2,N]iridium(iii) (Ir(piq)3), as red emitters, are covalently connected with the polyfluorene segments as blue emitters. Based on the hyperbranched structure, the conjugated polymers with large steric hindrance can effectively suppress the triplet-triplet annihilation. Simultaneously, the synthesized polymers express relatively better thermostability, photophysical properties, with a higher fluorescence quantum yield (57-77%), and electrochemical properties. By incorporating about 0.1 mol% of Ir(piq)3 into the conjugated polymers, the white-light emission could be achieved. Single-active-layer polymer light emitting devices with the configuration of ITO/PEDOT:PSS/polymer/TPBI/LiF/Al have been fabricated. Among all the devices, PF-Ir(piq)3100 device exhibits a Commission Internationale de l'Eclairage coordinate of (0.30, 0.23), which is close to that of pure white light. This indicates that the hyperbranched polymers exhibiting mixed fluorescence and phosphorescence emission would be promising white-light materials. 2015
Original languageEnglish
Pages (from-to)5180-5188
Number of pages9
JournalNew Journal of Chemistry
Volume39
Issue number7
DOIs
Publication statusPublished - 1 Jul 2015
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry

Cite this