M. Cho, Jung-il Jin, D. Choi
Nov 1, 2009
Citations
0
Influential Citations
19
Citations
Journal
Dyes and Pigments
Abstract
Abstract The ligands, 9-((6-phenylpyridin-3-yl)methyl)- 9H -carbazole and 9-(4-(pyridin-2-yl)benzyl)- 9H -carbazole were synthesized by attaching a carbazolyl group to the pyridine and phenyl rings of 2-phenylpyridine, respectively. Ir(III) complexes were prepared by a simple procedure and the solubility of the novel complexes was significantly better than that of the conventional, green-emitting conventional fac -tris(2-phenylpyridinato-C 2 ,N)iridium(III). The Ir(III) complexes were used to prepare electrophosphorescent polymer light-emitting devices. The device comprising 10% of fac -tris(2-(4′-((9 H -carbazol-9-yl)methyl)phenyl)pyridinato-C 2 ,N)iridium(III) exhibited an external quantum efficiency of 7.88%, luminous efficiency of 23.01 cd/A, and maximum brightness of 32,640 cd/m 2 . The color of the emissions of fac -tris(2-(4′-((9 H -carbazol-9-yl)methyl)phenyl)pyridinato-C 2 ,N)iridium(III) was similar to that of conventional fac -tris(2-phenylpyridinato-C 2 ,N)iridium(III). This work shows that integration of a rigid hole-transporting carbazole and phosphorescent complex in one molecule provides a new route to highly efficient, solution-processable complexes for electrophosphorescent applications.