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镱银阴极对顶发射白光OLED器件光电性能的影响研究

Study on the Effects of Yb: Ag Alloy Cathode on the Photoelectric Performance of the Top Emitting White Organic Light-emitting Devices

    摘要
  • 摘要: 研制了以镱银合金为透明阴极的顶发射白光OLED器件。采用ITO/NPB: LiQ（5%）（10 nm）/TCTA（20 nm）/FIrpic+3.5% Ir(ppy)3+0.5%Ir(MDQ)2(acac)（25 nm）/TPBI（10 nm）/LiF（5 nm）/Yb: Ag (X%)（X nm）器件结构，在相同镱银比例下，蒸镀不同厚度的镱银合金阴极制备了新型顶发射白光OLED器件，获得了优化的镱银合金厚度为12 nm；固定镱银阴极厚度，蒸镀不同比例的镱银合金阴极制备了新型顶发射白光OLED器件，探究不同比例的镱银合金对有机电致发光器件的影响。结果表明，当镱银电极的掺杂比例为10:1时，器件的性能最佳，在20 mA/cm2电流密度下，器件的驱动电压为2.3 V，亮度为1406 cd/m2，色坐标为(0.3407, 0.3922)。

     

    Abstract: Top-emitting white organic light-emitting diode(OLED) devices with a Mg: Ag alloy as a transparent cathode were fabricated. Based on the device structure of ITO/NPB: LiQ(5%) (10 nm)/TCTA(20 nm)/FIrpic+3.5% Ir(ppy)3+0.5%Ir(MDQ)2(acac) (25 nm)/TPBI(10 nm)/LiF(5 nm)/Yb: Ag (X%) (X nm), the top-emitting white OLED devices were prepared by using Yb: Ag alloy of different thickness as the cathode at the evaporation ratio of 10:1, the optimum thickness of Yb: Ag cathode was 12 nm by contrasting. The effect of different proportions of Yb: Ag alloy on OLEDs was investigated by changing the doping ratio of Ag. Based on the preliminary results, the alloy with a Ag mass fraction of 10% exhibits good electron injection characteristics, which can effectively improve the light-emitting characteristics of the device. When the current density was 20 mA/cm2, the driving voltage was 2.3 V, the brightness was 1406 cd/m2, and the color coordinates were close to (0.3407, 0.3922).

     

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