Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 18, Issue 18, Pages 2754-2762Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200800259
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Funding
- National Natural Science Foundation of China [20474067, 50673088, 50633040]
- Science Fund for Creative Research Groups [20621401]
- 973 Project [2002CB613401]
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A series of novel red-emitting iridium dendrimers functionalized with oligocarbazole host dendrons up to the third generation (red-G3) have been synthesized by a convergent method, and their photophysical, electrochemical, and electroluminescent properties have been investigated. In addition to controlling the intermolecular interactions, oligocarbazole-based dendrons could also participate in the electrochemical and charge-transporting process. As a result, highly efficient electrophosphorescent devices can be fabricated by spin-coating from chlorobenzene solution in different device configurations. The maximum external quantum efficiency (EQE) based on the non-doped device configuration increases monotonically with increasing dendron generation. An EQE as high as 6.3% was obtained as for the third generation dendrimer red-G3, which is about 30 times higher than that of the prototype red-GO. Further optimization of the device configuration gave an EQE of 11.8% (13.0 cd A(-1), 7.2 Im W-1) at 100 cd m(-2) with CIE coordinates of (0.65, 0.35). The state-of-the-art performance indicated the potential of these oligocarbazole-based red iridium dendrimers as solution processible emissive materials for organic light-emitting diode applications.
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