Cathode Formed by Thermal Evaporation of Ba:Al Alloy and Estimations of Barrier Height in an Organic LED

DING Lei; ZHANG Fang-Hui

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Cathode Formed by Thermal Evaporation of Ba:Al Alloy and Estimations of Barrier Height in an Organic LED

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@@ It is demonstrated that barium and aluminum alloy synthesized by melting in a glass tube under low vac- uum is applicable for organic laser emitting diodes (LEDs) as a thin film cathode.The alloy film obtained by the thermal evaporation of pre-synthesized alloy is used in a single-boat organic LED device with the struc- ture: indium tin oxide (ITO)/4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl(NPB)/tris-(8-hydroxyquinoline) aluminum(Alq<,3>) /barium:aluminum alloy.The experimental results show that devices with this alloy film cathode exhibit better current densityovoltage-luminance characteristics than those with a conventional pure AI cathode, and more weight of barium in aluminum leads to better performance of the devices.Characteristics of cur- rent density versus voltage for the electron-only devices are fitted by the Richardson-Schottky emission model, indicating that the electron injection barrier has a decrease of about 0.3 eV by this alloy cathode.

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《中国物理快报：英文版》 |2011年第6期|287-290|共4页
作者
DING Lei; ZHANG Fang-Hui;
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School of Electrical and Information Engineering, Shaanxi University of Science and Technology, Xi'an 710021;

School of Electrical and Information Engineering, Shaanxi University of Science and Technology, Xi'an 710021;

Shaanxi Panel Display Engineering Center, Xi'an 710021;

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Cathode Formed by Thermal Evaporation of Ba:Al Alloy and Estimations of Barrier Height in an Organic LED

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