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Highly efficient chlorine functionalized blue iridium(III) phosphors for blue and white phosphorescent organic light-emitting diodes with external quantum efficiency exceeding 20%

Abstract

The absence of highly efficient and stable blue phosphors is still a bottleneck for the development of high quality monochrome and white phosphorescent organic light-emitting diodes (OLEDs). Here, we proposed a chlorine-functionalization strategy for blue phosphors, and a series of the aromatic chlorine-based high-efficiency blue iridium(III) phosphors (Ir1-Ir4) containing various ancillary ligands were designed and prepared. These phosphors show intensive blue emissions with the PL peaks of 468~476 nm and the high ΦPL of 0.70~0.85 in dichloromethane. Using these blue phosphors as emitters, the fabricated OLEDs also realize similar blue emissions with the peaks located at 472, 484, 476, and 476 nm for Ir1-Ir4-based OLEDs, respectively. Moreover, the Ir2- and Ir3-based OLEDs exhibit the extremely high EQEs of exceeding theoretical limit, reaching 20.43% and 21.41%, respectively. In addition, two-color white OLED with Ir3 as blue emitter also achieves extremely high device efficiency, having the maximum EQE up to 20.17%. The excellent blue emission and high device efficiency indicates that four phosphors have huge potential applications for high performance blue and white phosphorescent OLEDs.

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Publication details

The article was received on 06 Mar 2018, accepted on 27 Apr 2018 and first published on 28 Apr 2018


Article type: Paper
DOI: 10.1039/C8TC01098F
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Highly efficient chlorine functionalized blue iridium(III) phosphors for blue and white phosphorescent organic light-emitting diodes with external quantum efficiency exceeding 20%

    Y. Miao, P. TAO, L. Gao, X. Li , L. Wei, S. Liu, H. Wang, B. Xu and Q. Zhao, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC01098F

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