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High-Efficiency Red Organic Light-Emitting Diodes Based on Double-Emissive Layer with the External Quantum Efficiency over 30%

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-transport materials as hosts, N,N′-diphenyl-N,N'-bis(1-naphthylphenyl)-1,1'-biphenyl-4,4'-diamine (NPB) and 4,4′,4′′-tri(Ncarbazolyl)triphenylamine (TCTA), was designed to enhance the exciton utilization. Accordingly, the resulting red OLED achieves excellent electroluminescence performance, exhibiting a maximum current efficiency of 49.2 cd/A, a maximum power efficiency of 53.5 lm/W and a maximum external quantum efficiency (EQE) of 30.3%. At the high brightness of 5000 cd/m2, they still maintain 42.3 cd/A, 21.4 lm/W and 25.4%, respectively. Furthermore, the device structure is very simple, neither p-type dopant nor n-type dopant in charge-transport layers. It can be seen that the introduction of the efficient D-EML greatly improved the electroluminescence performance of the OLED.

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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, Accepted Manuscript
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    High-Efficiency Red Organic Light-Emitting Diodes Based on Double-Emissive Layer with the 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, Accepted Manuscript , DOI: 10.1039/C8TC01639A

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