摘要
It is demonstrated that barium and aluminum alloy synthesized by melting in a glass tube under low vacuum 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 structure:indium tin oxide(ITO)/4,4'-bis[N−(1-naphthyl)-N−phenylamino]biphenyl(NPB)/tris-(8-hydroxyquinoline)aluminum(Alq3)/barium:aluminum alloy.The experimental results show that devices with this alloy film cathode exhibit better current density-voltage-luminance characteristics than those with a conventional pure Al cathode,and more weight of barium in aluminum leads to better performance of the devices.Characteristics of current 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.
作者
DING Lei
ZHANG Fang-Hui
丁磊;张方辉(School of Electrical and Information Engineering,Shaanxi University of Science and Technology,Xi'an 710021;Shaanxi Panel Display Engineering Center,Xi'an 710021)
基金
by the National Natural Science Foundation of China under Grant No 61076066
the Doctor Foundation of the Shaanxi University of Science and Technology(No BJ09-07).
