The unusual electrochemical and photophysical behavior of 2,2'-bis(1,3,4-oxadiazol-2-yl)biphenyls, effective electron transport hosts for phosphorescent organic light emitting diodes

Org Lett. 2007 Jan 18;9(2):235-8. doi: 10.1021/ol062668+.

Abstract

The fluorescence and phosphorescence of 2,2'-bis(5-phenyl-1,3,4-oxadiazol-2-yl)biphenyl shows good spectral matching with the absorption spectra of the MLCT1 and MLCT3 transitions of Ir(ppy)3. The red-shift of the 0-0 band in the phosphorescence at 77 K is due to the intramolecular pi-pi interactions between the oxadiazole side chains. Maximum brightness of 43,000 cd/m2 with an efficiency of 26 cd/A at 200 cd/m2 was achieved when BOBP was used as the host material for Ir(ppy)3 in the PHOLED study. [structure: see text].

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biphenyl Compounds / chemical synthesis
  • Biphenyl Compounds / chemistry*
  • Crystallography, X-Ray
  • Electrochemistry
  • Electrons
  • Lighting
  • Luminescent Agents / chemistry*
  • Models, Molecular
  • Molecular Structure
  • Organic Chemicals / chemistry*
  • Oxadiazoles / chemical synthesis
  • Oxadiazoles / chemistry*
  • Photochemistry
  • Stereoisomerism

Substances

  • Biphenyl Compounds
  • Luminescent Agents
  • Organic Chemicals
  • Oxadiazoles