Supramolecular π-π stacking pyrene-functioned fluorenes: Toward efficient solution-processable small molecule blue and white organic light emitting diodes

Feng Liu, Chao Tang, Qing Quan Chen, Fei Fei Shi, Hong Bin Wu, Ling Hai Xie, Bo Peng, Wei Wei, Yong Cao, Wei Huang

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

In this paper, we described a new category of solution-processible small molecule organic light emitting materialssthe pyrene-functioned diarylfluorenes: 2PPPF and DPPPF. In solution, both of the materials show deep blue emission. In film, their emission largely red-shifted due to strong π-π stacking of pyrene groups. 2PPPF, which is quite rigid in molecular structure, bearing only one alkoxyl group, could form smooth film by spin-coating. From the photoluminescence and morphology study, we believe the strong π-π stacking enhanced the film forming ability. 2PPPF is an amorphous blue light emitter, with a Tg over 100 *C and Td over 430 *C. The good thermal stability is comparable to polymeric light emitting materials. The material shows strong aggregated emission with a broad structureless peak at about 460 nm in film. Electroluminescent devices by spin-coating were successfully fabricated. A single-layered device using 2PPPF as the active material shows a turn on voltage of 4.3 v, brightness over 3600 cd/m 2, and current efficiency up to 1.30 cd/A. When 2PPPF was blended into PvK, the single-layered device takes on deep blue emission with the CIE 1931 coordinates at (0.16, 0.10). Single-layered white organic light emitting diodes using 2PPPF:MEHPPv blend as the bulk emitter had a maximum current efficiency up to 1.84 cd/A and brightness over 5700 cd/m2.

Original languageEnglish (US)
Pages (from-to)4641-4647
Number of pages7
JournalJournal of Physical Chemistry C
Volume113
Issue number11
DOIs
StatePublished - Mar 19 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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