Abstract
We report series of triphenylene derivatives with good electronic properties for the use as host materials for green phosphorescent organic light emitting diodes (PHOLEDs). We applied highly planar triphenylene moieties which could provide good electron transport ability and the carbazole or dibenzothiophene moieties which could provide good hole transport ability to obtain a bipolar host materials for green PHOLEDs. From this approach we achieved relatively good current efficiency up to 64 cd/A and external quantum efficiency up to 20.3%, respectively. This was the much more improved value (by ∼22.3%) compare to that obtained from the 4,4′-N,N′- dicarbazolebiphenyl system as a reference.
| Original language | English |
|---|---|
| Pages (from-to) | 221-228 |
| Number of pages | 8 |
| Journal | Dyes and Pigments |
| Volume | 101 |
| DOIs | |
| Publication status | Published - 2014 |
Bibliographical note
Funding Information:Prof. M. C. Suh was supported by the National Research Foundation of Korea (NRF) ( NRF-2011-00006847 ). Prof. J.-H. Lee was supported by a grant (Catholic Univ.) from the Fundamental R&D program for Core Technology of Materials funded by the Ministry of Knowledge Economy (MKE), Republic of Korea . High resolution mass spectroscopy and MALDI-TOF was carried out at Korea Basic Science Institute (Mass Spectrometry Research Team).
Keywords
- Carbazole
- Charge balance
- Dibenzothiophene
- Green phosphorescent OLED
- Host materials
- Triphenylene