Well defined carbazol-3,9-diyl based oligomers as host materials for organic electrophosphorescent devices
Journal
Molecular Crystals and Liquid Crystals
Journal Volume
468
Journal Issue
1
Pages
77-86
Date Issued
2007-01
Author(s)
Abstract
Well defined carbazol-3,9-diyl-based derivatives as host materials for electro-phosphorescent devices have been synthesized by the modified Ullmann reaction as a key step. The full characterization of their structure by mass spectrometry, infrared absorption and proton magnetic resonance spectroscopy is presented. The amorphous compounds with glass transition temperatures of 103–154°C possess high thermal stability with onset decomposition temperatures exceeding 360°C. Conjugation of the 3,9-linked systems is rather confined within one carbazole unit, retaining large triplet energies suitable for green and red electro-phosphorescence. Using the new host material, efficient green phosphorescent organic light emitting diodes was demonstrated.
Type
journal article