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Hu J.-T.,National Engineering Laboratory for Special Display Technology | Hu J.-T.,Hefei University of Technology | Deng Y.-F.,National Engineering Laboratory for Special Display Technology | Deng Y.-F.,Hefei University of Technology | And 4 more authors.
Chinese Journal of Liquid Crystals and Displays | Year: 2016

A metal/oxide/metal (M1/O/M2) stack Ag/MoO3/Ag is introduced to fabricate organic light-emitting devices (OLEDs) as a anode instead for ITO. Effects of different structures of the anode on transmittance, brightness, spectrum of OLEDs are researched in this paper. A series of devices is fabricated by the means of vacuum evaporating with the structure of Ag/MoO3/Ag/MoO3(10 nm)/NPB(40 nm)/Alq3(60 nm)/LiF(1 nm)/Al(150 nm). Current density-voltage characteristic, brightness-voltage characteristic, spectrogram characteristic of the devices are analyzed. It is found that brightness of the device which is applied Ag/MoO3/Ag 20/20/10(nm) as the anode reaches the maximum of 18421 cd/m2 and the best current efficiency of 2.45 cd/A with the operating voltage of 11 V. Because of microcavity effect, the center wavelength of EL spectra is blue-shifted and the full width at half maximum becomes narrower. But considering its electrode transmittance is only 17% at 530 nm, the OLED device is actually brighter than the ITO electrode device by the conversion. They can be used as anodes for top-emitting and transparent flexible OLED because of the simplicity of the production. © 2016, Science Press. All rights reserved. Source


Hu J.-T.,National Engineering Laboratory for Special Display Technology | Hu J.-T.,Hefei University of Technology | Deng Y.-F.,National Engineering Laboratory for Special Display Technology | Deng Y.-F.,Hefei University of Technology | And 4 more authors.
Optoelectronics Letters | Year: 2015

A transparent 3-mercaptopropyl trimethoxysilane (MPTMS)/Ag/MoO3 composite anode is introduced to fabricate green organic light-emitting diodes (OLEDs). Effects of the composite anode on brightness and operating voltage of OLEDs are researched. By optimizing the thickness of each layer of the MPTMS/Ag/MoO3 structure, the transmittance of MPTMS/Ag (8 nm)/MoO3 (30 nm) reaches over 75% at about 520 nm. The sheet resistance is 3.78 Ω/□, corresponding to this MPTMS/Ag (8 nm)/MoO3 (30 nm) structure. For the OLEDs with the optimized anode, the maximum electroluminescence (EL) current efficiency reaches 4.5 cd/A, and the maximum brightness is 37 036 cd/m2. Moreover, the OLEDs with the optimized anode exhibit a very low operating voltage (2.6 V) for obtaining brightness of 100 cd/m2. We consider that the improved device performance is mainly attributed to the enhanced hole injection resulting from the reduced hole injection barrier height. Our results indicate that employing the MPTMS/Ag/MoO3 as a composite anode can be a simple and promising technique in the fabrication of low-operating voltage and high-brightness OLEDs. © 2015, Tianjin University of Technology and Springer-Verlag Berlin Heidelberg. Source

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