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Optimized electron-transport material based on m-terphenyl-diphenylphosphine oxide with the harmonious compatibility of high ET and electron mobility for highly efficient OLEDs

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Abstract

Two electron transporting materials, [1,1′:3′,1′′-terphenyl]-3,3′′-diylbis(diphenylphosphine oxide) (BmPOPB) and [1,1′:3′,1′′-terphenyl]-4,4′′-diylbis(diphenylphosphine oxide) (BpPOPB), have been designed and synthesized by appending a diphenylphosphine oxide moiety to the m-terphenyl core via meta- and para-linkage topologies. The influence of different linking modes on the thermal, photophysical, electrochemical, and electron transport properties of the compounds is systematically studied. Through the meta-linkage topology and supernumerary transporting channel assisted by diphenylphosphine oxide, the harmonious compatibility of a high triplet energy level (ET) of 2.82 eV and a high electron mobility of around 10−4 cm2 V−1 s−1 for BmPOPB has been achieved. When BmPOPB was used as an electron-transport material (ETM), the Ir(ppy)3-based green device hosted by CBP exhibited excellent performance with a maximum external quantum efficiency (EQE) of 22.68%; FIrpic-based and 2CzPN-based blue OLEDs hosted by mCP displayed maximum external quantum efficiencies (EQEs) of 21.3% and 17.4%, respectively. All the device performances outperformed that of its isomer BpPOPB and the typical ETM, 1,3,5-tris(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene (TPBi). This contribution rationally demonstrated the significance of the harmonious compatibility in designing electron-transport materials for high-performance OLEDs.

Graphical abstract: Optimized electron-transport material based on m-terphenyl-diphenylphosphine oxide with the harmonious compatibility of high ET and electron mobility for highly efficient OLEDs

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Publication details

The article was received on 04 Jun 2017, accepted on 17 Jul 2017 and first published on 18 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC02459B
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Optimized electron-transport material based on m-terphenyl-diphenylphosphine oxide with the harmonious compatibility of high ET and electron mobility for highly efficient OLEDs

    Q. Zhang, B. Wang, J. Tan, G. Mu, W. Yi, X. Lv, S. Zhuang, W. Liu and L. Wang, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC02459B

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