针对磷光器件存在严重的效率滚降，进而制约有机电致发光器件的实用化进程的问题，提出采用超声喷涂Poly（3，4-ethylenedioxythiophene）Polystyrene Sulfonate（PEDOT：PSS）作为透明电极，制备了红、绿、蓝三色有机电致发光器件.利用超声喷涂工艺材料利用率高的特点，起绝缘作用的水溶性PSS分子链在PEDOT：PSS透明电极中得到保留，使该透明电极具有空穴缓冲作用.这种双功能性，提高了器件在高电流密度下的载流子平衡性，降低了红、绿、蓝三色发光层中的极化子浓度，改善了红、绿、蓝三色器件的效率滚降问题，从最高外量子效率所在亮度到10 000 cd/m²的电流效率滚降分别仅为14.9%、12.4%和16.0%.该结果表明，双功能性电极的引入显著改善了有机电致发光器件中载流子平衡性，具有降低三基色器件效率滚降的普适性，对实现高亮度、高效率发光器件具有重要意义.

To solve serious efficiency roll-off of phosphorescent organic light-emitting devices (OLEDs) that still hinders further development of OLEDs, ultrasonic spray coating poly(3, 4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) films were proposed as transparent electrode for fabricating red, green and blue OLEDs. The water-soluble PSS molecular chain, which is insulating, was retained in the PEDOT:PSS transparent electrode by utilizing the high utilization rate of ultrasonic spraying materials, resulting in hole buffer effect of such PEDOT:PSS transparent electrode. Dual functions of this type of PEDOT:PSS transparent electrode is used to improve carrier balance under high current density, reduce the polaron density in the red, green and blue emitting layers, and finally improve the efficiency roll-off of these OLEDs. From the luminance of maximum current efficiency to the luminance of 10 000 cd/m², efficiency roll-off of red, green and blue devices is only 14.9%, 12.4% and 16.0%, respectively. The results show that the introduction of dual functional electrode significantly improves carrier balance in organic luminescent devices, and is universal to reduce efficiency roll-off of three primary color devices, which is of great significance to achieve high brightness efficienct OLEDs.