Tandem organic light-emitting diode with molybdenum tri-oxide thin film interconnector layer

doi:10.1088/1674-1056/22/1/037202

Abstract A 10-nm thickness molybdenum tri-oxide (MoO₃) thin film was used as the interconnector layer in tandem organic light-emitting devices (OLEDs). The tandem OLEDs with two identical emissive units consisting of N,N'-bis(naphthalen-1-yl)-N,N'-bis(phenyl)-benzidine (NPB)/tris(8-hydroxyquinoline) aluminum (Alq₃) exhibited current efficiency–current density characteristics superior to the conventional single-unit devices. At 20 mA/cm², the current efficiency of the tandem OLEDs using the interconnector layers of MoO₃ thin film was about 4.0 cd/A, which is about twice of that of the corresponding conventional single-unit device (1.8 cd/A). The tandem OLED showed a higher power efficiency than the conventional single-unit device for luminance over 1200 cd/m². The experimental results demonstrated that a MoO₃ thin film with a proper thickness can be used as an effective interconnector layer in tandem OLEDs. Such an interconnector layer can be easily fabricated by simple thermal evaporation, greatly simplifying the device processing and fabrication processes required by previously reported interconnector layers. A possible explanation was proposed for the carrier generation of the MoO₃ interconnector layer.

Keywords: tandem organic light-emitting device MoO₃ thin film interconnector layer

Received: 24 September 2012
Revised: 15 November 2012
Accepted manuscript online:

PACS:	72.80.Le	(Polymers; organic compounds (including organic semiconductors))
	78.60.Fi	(Electroluminescence)
	85.60.Jb	(Light-emitting devices)

Fund: Project supported by the Doctoral Foundation of the Ministry of Education of China (Grant No. 20100171110025), the State Key Laboratory of Optoelectronic Materials and Technologies, China (Grant No. 2010-RC-3-1), and the Fundamental Research Funds for the Central Universities, China (Grant No. 09lgpy25).

Corresponding Authors: Zhou Xiang
E-mail: stszx@mail.sysu.edu.cn

Cite this article:

Lu Fei-Ping (路飞平), Wang Qian (王倩), Zhou Xiang (周翔) Tandem organic light-emitting diode with molybdenum tri-oxide thin film interconnector layer 2013 Chin. Phys. B 22 037202

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Tandem organic light-emitting diode with molybdenum tri-oxide thin film interconnector layer

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