Independently controllable stacked OLEDs with high efficiency by using semitransparent Al/oxide/Au intermediate connecting layer

Abstract

In stacked OLEDs, the intermediate connection layer plays critical role in modifying the device performance. For the independently controllable stacked OLEDs, the intermediate connecting structure should simultaneously function as an anode for one unit and as a cathode for another unit. To realize the simultaneous function, at present a semitransparent metal layer or a transparent indium-tin oxide (ITO), such as, Mg:Ag/ indium zinc oxide [1], CuPc /indium tin oxide (ITO) [2], and LiF/Ca/Ag [3], is generally used. However, the potential thin film damage due to sputtering of ITO and the transmission problem of the thin metal electrodes may limit the improvement of the device performance. Therefore, it is desirable to develop the intermediate controllable metal electrodes with the targets of not only improving the transmission but also enhancing the efficiency of the stacked OLEDs.