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High-efficiency red organic light-emitting diodes based on a double-emissive layer with an external quantum efficiency over 30%

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Abstract

It has been demonstrated that the performance of organic light-emitting diodes (OLEDs) is significantly related to the emissive layer (EML) architecture. In this article, an efficient double-emissive layer (D-EML) structure based on two different hole-transporting materials as hosts, N,N′-diphenyl-N,N′-bis(1-naphthylphenyl)-1,1′-biphenyl-4,4′-diamine (NPB) and 4,4′,4′′-tri(N-carbazolyl)triphenylamine (TCTA), was designed to enhance the exciton utilization. Accordingly, the resulting red OLED shows excellent electroluminescence performance, exhibiting a maximum current efficiency of 49.2 cd A−1, a maximum power efficiency of 53.5 lm W−1 and a maximum external quantum efficiency (EQE) of 30.3%. At a high brightness of 5000 cd m−2, they still remained at 42.3 cd A−1, 21.4 lm W−1 and 25.4%, respectively. Furthermore, its device structure is very simple, with neither a p-type dopant nor an n-type dopant in the charge-transporting layers. It can be seen that the introduction of an efficient D-EML greatly improved the electroluminescence performance of the OLED.

Graphical abstract: High-efficiency red organic light-emitting diodes based on a double-emissive layer with an external quantum efficiency over 30%

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Publication details

The article was received on 08 Apr 2018, accepted on 04 Jun 2018 and first published on 07 Jun 2018


Article type: Paper
DOI: 10.1039/C8TC01639A
Citation: J. Mater. Chem. C, 2018, Advance Article
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    High-efficiency red organic light-emitting diodes based on a double-emissive layer with an external quantum efficiency over 30%

    Y. Wang, W. Wang, Z. Huang, H. Wang, J. Zhao, J. Yu and D. Ma, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C8TC01639A

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