Abstract
New soluble host materials with benzocarbazole and triphenyltriazine moieties, 11-[3-(4,6-diphenyl-[1,3,5]triazin-2-yl)-phenyl]-11H-benzo[a]carbazole and 11-[3′-(4,6-diphenyl-[1,3,5]triazin-2-yl)-biphenyl-4-yl]-11H-benzo[a]carbazole, were synthesized for highly efficient red phosphorescent organic light-emitting diodes (PHOLED). Hole-transporting benzocarbazole moiety and electron transporting triphenyltriazine moiety, which are severely twisted each other enhance the solubility of those materials in common organic solvent. The improved solubility from this molecular design could be due to a reduced π-π stacking interaction, which gives a very uniform film morphology after spin coating of those materials. As a result, we obtained highly efficient soluble PHOLEDs combined with an evaporated blue common layer structure. The resultant red PHOLED exhibited the maximum current efficiency as well as external quantum efficiency values up to 23.7 cd/A and 19.0%.
| Original language | English |
|---|---|
| Pages (from-to) | 18256-18265 |
| Number of pages | 10 |
| Journal | ACS applied materials & interfaces |
| Volume | 8 |
| Issue number | 28 |
| DOIs | |
| Publication status | Published - 20 Jul 2016 |
Bibliographical note
Publisher Copyright:© 2016 American Chemical Society.
Keywords
- blue common layer
- cross-linked HTL
- organic light-emitting diodes
- relative current density
- solution processed red PHOLED