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Issue 27, 2016
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Doped hole injection bilayers for solution processable blue phosphorescent organic light-emitting diodes

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Abstract

Carrier injection plays an important role in determining the device performance of organic light-emitting diodes (OLEDs). 1,4,5,8,9,11-Hexaazatriphenylene hexacarbonitrile (HAT-CN) has been widely used as an effective material to promote the hole injection when fabricating vacuum deposited OLEDs. However, serious crystallization occurs in solution-processed HAT-CN films, which weakens its hole injection ability in OLEDs. Herein, we demonstrate a solution-processed composite film as the hole injection layer (HIL) in OLEDs developed by mixing HAT-CN with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ). The crystallization is suppressed effectively by optimizing the mixing ratio. In addition, a doping of HAT-CN:F4-TCNQ composite film contributes to a decreased hole injection barrier, which can be reflected from the current density–voltage curve. Furthermore, HAT-CN:F4-TCNQ is successfully combined with MoO3 doped copper phthalocyanine-3,4′,4′′,4′′′-tetra-sulfonated acid tetra sodium salt (TS-CuPc) as bi-HIL in solution-processable blue phosphorescent OLEDs, which exhibit a maximum current efficiency of 16.7 cd A−1.

Graphical abstract: Doped hole injection bilayers for solution processable blue phosphorescent organic light-emitting diodes

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Publication details

The article was received on 21 Apr 2016, accepted on 13 Jun 2016 and first published on 14 Jun 2016


Article type: Paper
DOI: 10.1039/C6TC01624C
J. Mater. Chem. C, 2016,4, 6570-6574

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    Doped hole injection bilayers for solution processable blue phosphorescent organic light-emitting diodes

    B. Wang, L. Zhang, Y. Hu, X. Shi, Z. Wang and L. Liao, J. Mater. Chem. C, 2016, 4, 6570
    DOI: 10.1039/C6TC01624C

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