Abstract
In this work, bicarbazole-dibenzofuran backbone structure based host materials, 9'-(dibenzo[b,d]furan-2-yl)-9-phenyl-9H,9'H-3,4'-bicarbazole (3PCz4CzFu) and 9-(dibenzo[b,d]furan-2-yl)-9'-phenyl-9H,9'H-3,4'-bicarbazole (4PCz3CzFu), were designed and synthesized. Since both materials have twisted molecular structure, they showed high triplet energy of above 2.90 eV. Also, they showed high hole current density, which enabled high external quantum efficiency of over 24.0% in the deep blue phosphorescent organic light-emitting diodes. Compared with 3PCz4CzFu, 4PCz3CzFu showed improved external quantum efficiency, efficiency roll-off, and lifetime because 4PCz3CzFu have better hole transporting property than 3PCz4CzFu in hole only device.
| Original language | English |
|---|---|
| Pages (from-to) | 2039-2042 |
| Number of pages | 4 |
| Journal | Digest of Technical Papers - SID International Symposium |
| Volume | 51 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2020 |
| Event | 57th SID International Symposium, Seminar and Exhibition, Display Week, 2020 - Virtual, Online Duration: 3 Aug 2020 → 7 Aug 2020 |
Keywords
- Blue OLED
- External quantum efficiency
- High triplet energy
- Lifetime
- Organic light-emitting diodes