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An oligocarbazole-encapsulated heteroleptic red iridium complex for solution-processed nondoped phosphorescent organic light-emitting diodes with over 10% external quantum efficiency

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Abstract

A novel self-host red Ir dendrimer D-(PPQ)2Ir(acac) has been developed for solution-processed nondoped phosphorescent organic light-emitting diodes (PhOLEDs) by fully encapsulating the heteroleptic complex (PPQ)2Ir(acac) with oligocarbazole at both the CN and OO ligands. Due to the shielding effect of the dendritic wedge, the intermolecular interactions and luminescence quenching are found to be significantly reduced from (PPQ)2Ir(acac) to D-(PPQ)2Ir(acac). Correspondingly, the maximum external quantum efficiency (EQE) of hybrid-solution-processed electrophosphorescent devices is increased from 0.5% to 9.9%. Moreover, D-(PPQ)2Ir(acac) shows a good alcohol resistance in the presence of the large-size carbazole dendrons. Such a feature does favor the successful fabrication of all-solution-processed devices via an orthogonal solvent processing, revealing an optimized EQE as high as 11.1% (8.7 cd A−1, 6.0 lm W−1) with CIE coordinates of (0.67, 0.33). The results indicate that highly efficient solution-processed red-emitting nondoped PhOLEDs with over 10% EQE can also be realized based on a self-host phosphorescent dendrimer system.

Graphical abstract: An oligocarbazole-encapsulated heteroleptic red iridium complex for solution-processed nondoped phosphorescent organic light-emitting diodes with over 10% external quantum efficiency

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Publication details

The article was received on 10 Jan 2017, accepted on 15 Feb 2017 and first published on 15 Feb 2017


Article type: Paper
DOI: 10.1039/C7TC00145B
Citation: J. Mater. Chem. C, 2017, Advance Article
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    An oligocarbazole-encapsulated heteroleptic red iridium complex for solution-processed nondoped phosphorescent organic light-emitting diodes with over 10% external quantum efficiency

    L. Chen, S. Wang, Z. Yan, J. Ding and L. Wang, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC00145B

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