Polyethers with pendent phenylvinyl substituted carbazole rings as polymers for hole transporting layers of OLEDs
Abstract
Polyethers containing pendent 3-(2-phenylvinyl)carbazole moieties have been synthesized by the multi-step synthetic routes. Full characterization of their structures is presented. The polymers represent materials of high thermal stability with initial thermal degradation temperatures exceeding 370 °C. The glass transition temperatures of the amorphous materials were in the range of 56-658 °C. The electron photoemission spectra of thin layers of the polymers showed ionization potentials of about 5.6 eV. Hole-transporting properties of the polymeric materials were tested in the structures of organic light emitting diodes with Alq3 as the green emitter and electron transporting layer. The device containing hole-transporting layers of poly{9-[6-(3-methyloxetan-3-ylmethoxy)hexyl]-3-(2-phenylvinyl)carbazole} exhibited the best overall performance with a maximum photometric efficiency of about 4.0 cd/A and maximum brightness exceeding 6430 cd/m2.
- Publication:
-
Optical Materials
- Pub Date:
- January 2016
- DOI:
- 10.1016/j.optmat.2015.11.030
- Bibcode:
- 2016OptMa..51..148G
- Keywords:
-
- Polymer;
- Carbazole;
- Amorphous material;
- Ionization potential;
- Charge transporting layer;
- Light emitting diode