Self‐Host Blue‐Emitting Iridium Dendrimer with Carbazole Dendrons: Nondoped Phosphorescent Organic Light‐Emitting Diodes |
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| Authors: | Debin Xia Bin Wang Bo Chen Shumeng Wang Dr Baohua Zhang Dr Junqiao Ding Prof Lixiang Wang Prof Xiabin Jing Prof Fosong Wang |
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| Institution: | 1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (P. R. China);2. University of the Chinese Academy of Sciences, Beijing 100049 (P. R. China) |
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| Abstract: | 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 tris2‐(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). |
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| Keywords: | dendrimers heterocycles iridium supramolecular chemistry synthesis design |
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