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Wet-process feasible novel carbazole-type molecular host for high efficiency phosphorescent organic light emitting diodes
| Content Provider | Semantic Scholar |
|---|---|
| Author | Jou, Jwo-Huei Kumar, Sudhir Tavgeniene, D. An, Chih-Chia Fang, P. Zaleckas, Ernestas Gražulevičius, Juozas Vidas Grigalevičius, Saulius |
| Copyright Year | 2014 |
| Abstract | Wet-process organic light-emitting diodes (OLEDs) are crucial to realize cost-effective and large-area roll-to-roll fabrication of high quality displays and lightings. In this study, a wet-process feasible carbazole based host material, 2-[4-(carbazol-9-yl)butyloxy]-9-[4-(carbazol-9-yl)butyl]carbazole (6), is synthesized, and two other carbazole hosts, 2-[5-(carbazol-9-yl)pentyloxy]-9-[5-(carbazol-9-yl)pentyl]carbazole (7) and 2-[6-(carbazol-9-yl)hexyloxy]-9-[6-(carbazol-9-yl)hexyl]carbazole (8) are also synthesized for comparison. All the three host materials exhibit high triplet energy, and possess high solubility in common organic solvents at room temperature. On doping a green phosphorescent emitter fac tris(2-phenylpyridine)iridium (Ir(ppy)3) into host 6, the device shows an efficacy of 51 lm W−1 and a current efficiency of 52 cd A−1 at 100 cd m−2 or 30 lm W−1 and 40.7 cd A−1 at 1000 cd m−2. The high efficiency may be attributed to the host possessing an effective host-to-guest energy transfer, the ability for excitons to generate on both host and guest, and excellent film integrity. |
| Starting Page | 8707 |
| Ending Page | 8714 |
| Page Count | 8 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C4TC01423E |
| Volume Number | 2 |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/tc/c4/c4tc01423e/c4tc01423e1.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
