Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 20, Issue 37, Pages 8167-8170Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm01460e
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Funding
- NTU
- NSF
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We report the synthesis, optical and electrochemical properties, as well as the fabrication of light-emitting devices for a new twistacene 1,2,3,4,6,13-hexaphenyl-7 : 8,11 : 12-bisbenzo-pentacene (HBP 1). Its structure, determined by X-ray crystallography, confirmed that this material has a twisted topology with the torsion angle as high as 23.0 degrees. HBP 1 showed bright green emission both in solution and solid state. The HOMO-LUMO gap of HBP 1 calculated from the difference between the half-wave redox potentials (E-1/2(ox) - +0.74 eV and E-1/2(red) - -1.93 eV) is 2.67 eV, which is in good agreement with the band gap, 2.64 eV, derived from the UV-Vis absorption data. Organic light emitting devices using HBP 1 as the emitters have been fabricated. The results revealed that twistacenes are promising materials to enhance the efficiency of OLEDs.
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