具有复合空穴传输层的高效低压有机电致发光器件

• 作 者: 俞东斌 林华平 张小文 周帆 李俊 张良 蒋雪茵 张志林
• 机 构: 上海大学材料科学与工程学院,上海大学新型显示技术及应用集成教育部重点实验室,
• 出 处: 光电子.激光
• 发表日期: 2011年01期
• 关键词: 空穴传输层 空穴注入 载流子平衡 发光层 器件 器件性能 迁移率 空穴迁移率 空穴 高发光效率

报道了用m-MTDATA掺杂NPB作复合空穴传输层(c-HTL)的高效率、低电压有机电致发光器件(OLED),器件的最高发光效率达到了5.3 cd/A,比NPB作HTL的器件(3.4 cd/A)提高了约50%。这是由于c-HTL具有较低的空穴迁移率,改善了发光层中两种载流子的平衡,从而提高了器件性能。进一步在ITO与c-HTL间插入MoOx层,可以减小空穴注入势垒,使得器件在保持较高发光效率(5.1 cd/A)的情况下其驱动电压降低了近1 V,对应的功率效率达到了4.6 lm/W,比未加MoOx层的器件(3.5 lm/W)提高了约30%。

Reported a high efficiency, low voltage organic electroluminescent device (OLED) doped with NPB as m-MTDATA as a hole-transport layer (c-HTL). The maximum luminous efficiency of the device reached 5.3 cd / HTL device (3.4 cd / A) increased by about 50%. This is due to the lower hole mobility of c-HTL, which improves the balance of the two carriers in the light-emitting layer, thereby improving device performance. Further insertion of a MoOx layer between the ITO and the c-HTL can reduce the hole injection barrier, so that the driving voltage of the device is reduced by nearly 1 V while maintaining the high luminous efficiency (5.1 cd / A), and the corresponding power The efficiency reached 4.6 lm / W, which is about 30% higher than the device without MoOx layer (3.5 lm / W).