We present a low absorption semi-transparent cathode for top-emitting organic lighting diodes (TEOLEDs). To reduce the light loss by electrode absorption, transparent cathode materials with a high refractive index and low extinction coefficient characteristics at the visible light range are investigated for the highly efficient TEOLEDs. Molybdenum trioxide (MoO₃) and tungsten trioxide (WO₃) are considered as the transparent materials. Due to the low conductivity of MoO₃ and WO₃, a small amount of silver (Ag) is blended in order to enhance the electrical property as electrodes. Optimized MoO₃:Ag mixed film shows the reduced extinction coefficient by half compared to Mg:Ag. With a general organic material (refractive index∼1.8) as a capping layer, the average absorption, transmittance and omnidirectional reflectance of 18.2, 65.9, and 25.6% are observed, respectively, with a sheet resistance of 12.7 Ω/□. The current efficiencies of fabricated red, green and blue TEOLEDs with optimized MoO₃:Ag cathode are 32.4, 76.8, and 2.8 cd/A, respectively. The performance enhancement ratio is 9.8, 13.6, and 86.7% for red, green and blue devices compared with Mg:Ag cathode devices.

我们提出了一种用于顶部发射有机发光二极管（TEOLED）的低吸收半透明阴极。为了减少由于电极吸收而造成的光损失，研究了在高效可见光OLEDs中在可见光范围内具有高折射率和低消光系数特性的透明阴极材料。三氧化钼（MoO ₃）和三氧化钨（WO ₃）被认为是透明材料。由于MoO ₃和WO _3的电导率低，为了提高作为电极的电性能，掺入了少量的银（Ag）。优化的MoO ₃:: Ag混合膜的消光系数比Mg：Ag降低了一半。使用一般的有机材料（折射率约为1.8）作为覆盖层，其平均吸收，透射率和全向反射率分别为18.2、65.9和25.6％，薄层电阻为12.7Ω/□。带有优化的MoO ₃：Ag阴极的红色，绿色和蓝色TEOLED的电流效率分别为32.4、76.8和2.8 cd / A。与Mg：Ag阴极器件相比，红色，绿色和蓝色器件的性能增强率为9.8、13.6和86.7％。