1415660-34-2Relevant academic research and scientific papers
Self-host blue-emitting iridium dendrimer with carbazole dendrons: Nondoped phosphorescent organic light-emitting diodes
Xia, Debin,Wang, Bin,Chen, Bo,Wang, Shumeng,Zhang, Baohua,Ding, Junqiao,Wang, Lixiang,Jing, Xiabin,Wang, Fosong
, p. 1048 - 1052 (2014)
A blue-emitting iridium dendrimer, namely B-G2, has been successfully designed and synthesized with a second-generation oligocarbazole as the dendron, which is covalently attached to the emissive tris[2-(2,4-difluorophenyl)- pyridyl]iridium(III) core through a nonconjugated link to form an efficient self-host system in one dendrimer. Unlike small molecular phosphors and other phosphorescent dendrimers, B-G2 shows a continuous enhancement in the device efficiency with increasing doping concentration. When using neat B-G2 as the emitting layer, the nondoped device is achieved without loss in efficiency, thus giving a state-of-art EQE as high as 15.3 % (31.3 cd A-1, 28.9 lm W-1) along with CIE coordinates of (0.16, 0.29). Out of the blue: The title dendrimer has been developed by covalently attaching a second-generation carbazole dendron to an emissive tris[2-(2,4-difluorophenyl)-pyridyl] iridium(III) core through a nonconjugated linker to form an efficient self-host system (see figure). Unlike small molecular phosphors and other phosphorescent dendrimers known to date, the nondoped phosphorescent organic light-emitting diodes herein are realized without a loss in efficiency. Copyright
