Effect of Al:Ag alloy cathode on the performance of transparent organic light-emitting devices

LIU Jin-hong; ZHANG Fang-hui

doi:doi:10.1007/s11801-017-7039-0

光电子快报（英文版）, 2017, 13 (3): 175, Published Online: Sep. 13, 2018

Effect of Al:Ag alloy cathode on the performance of transparent organic light-emitting devices

论文大纲

LIU Jin-hong ZHANG Fang-hui ^*

Author Affiliations

College of Electrical and Information Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China

Abstract

Transparent organic light-emitting devices (TOLEDs) based on a stacked alloy cathode of LiF/Al:Ag are investigated. The devices have a structure of indium-tin-oxide (ITO)/4,4′,4′′-Tris[2-naphthyl(phenyl)amino]triphenylamine (2T-NATA) (25 nm)/N,N'-Di-[(1-naphthyl)-N,N'-diphenyl]-1,1'-biphenyl-4,4'-diamine (NPB) (40 nm)/tris-(8-hydroxyquinoline) aluminum (Alq3) (50 nm)/LiF (1 nm)/Al:Ag (1:3) (x), where the thicknesses of cathode metal layers (Al:Ag) are adjusted, respectively, from 70 nm to 100 nm. In the experiment, it is found that the LiF (1 nm)/Al:Ag (1:3) (75 nm) has good electron injection efficiency. Compared with an Al-only cathode, the turn-on voltage is lowered. At the voltage of 10 V, the luminances for bottom emission from ITO anode side and top emission from metal cathode side are 2 459 cd/m²and 1 729 cd/m², respectively. Thanks to electron injection enhancement by using Al:Ag cathode, we can obtain a better energy level matching between the cathode and the organic layer, thus the devices have lower turn-on voltage and higher luminance. The total transmittance of the devices can achieve about 40% at the wavelength of 550 nm.

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LIU Jin-hong, ZHANG Fang-hui. Effect of Al:Ag alloy cathode on the performance of transparent organic light-emitting devices[J]. 光电子快报（英文版）, 2017, 13(3): 175.

Effect of Al:Ag alloy cathode on the performance of transparent organic light-emitting devices

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