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Issue 37, 2017
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Solution processable red iridium dendrimers containing oligocarbazole dendrons for efficient nondoped and doped phosphorescent OLEDs

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Abstract

Solution processable red Ir dendrimers named R-D1, R-D2 and R-D3, which contain a quinoline-based homoleptic complex as the core and oligocarbazole as the dendron, have been facilely and successfully designed and synthesized via a post-dendronization procedure. With the increasing dendron generation from R-D1 to R-D3, the intermolecular interactions and luminescence quenching in solid states are found to be effectively prevented because of encapsulation from the outer dendrons. As a result, the third-generation dendrimer R-D3 achieves the best nondoped device performance, revealing a promising EQE of 10.5% (9.2 cd A−1, 7.0 lm W−1) with CIE coordinates of (0.67, 0.33). Furthermore, the doped devices of R-D3 show a wide doping concentration window in the range of 5–30 wt%, and a maximum EQE as high as 18.3% (25.7 cd A−1, 33.0 lm W−1) is realized at about a 10 wt% doping content. The results can compete well with vacuum-deposited small molecular red phosphors, representing important progress on solution processable phosphorescent dendrimers with red emission.

Graphical abstract: Solution processable red iridium dendrimers containing oligocarbazole dendrons for efficient nondoped and doped phosphorescent OLEDs

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Publication details

The article was received on 27 Jul 2017, accepted on 28 Aug 2017 and first published on 29 Aug 2017


Article type: Paper
DOI: 10.1039/C7TC03374E
Citation: J. Mater. Chem. C, 2017,5, 9753-9760
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    Solution processable red iridium dendrimers containing oligocarbazole dendrons for efficient nondoped and doped phosphorescent OLEDs

    L. Zhao, S. Wang, J. Lü, J. Ding and L. Wang, J. Mater. Chem. C, 2017, 5, 9753
    DOI: 10.1039/C7TC03374E

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