Journal of Materials Chemistry C p. 8707 - 8714 (2014)
Update date:2022-08-17
Topics:
Jou, Jwo-Huei
Kumar, Sudhir
Tavgeniene, Daiva
An, Chih-Chia
Fang, Po-Hsun
Zaleckas, Ernestas
Grazulevicius, Juozas V.
Grigalevicius, Saulius
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.
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