有机层厚度对柔性衬底OLED性能的影响  

Effects of thickness of the organic layers on the characteristics of flexible OLEDs

作　　者：叶丽娜[1] 夏广瑞[1] 赵俊卿[2] 庞智勇[1] 

机构地区：[1]山东大学物理学院晶体材料国家重点实验室,山东济南250100 [2]山东建筑大学理学院,山东济南250101

出　　处：《山东建筑大学学报》2008年第4期350-354,373,共6页Journal of Shandong Jianzhu University

基　　金：国家自然科学基金资助项目(60176021)

摘　　要：采用真空热蒸发的方法制备出具柔性衬底和ITO/TPD/Alq3/Al结构的有机电致发光器件(OLED)。利用原子力显微镜(AFM)研究了制备条件对有机层结构形貌的影响。通过改变有机层的厚度,研究了有机层厚度对柔性OLED工作电压、发光效率等性能的影响。同时发现分别增大空穴传输层TPD或发光层Alq3的厚度都会提高器件的工作电压。发光层Alq3厚度的增大还能引起发光效率的提高,而TPD厚度的增大对发光效率的影响则是复杂的。对于上述现象用遂穿理论以及直接带模型进行了解释并对制备高亮度、高效率及低耗的柔性OLED具有一定的指导意义。Flexible OLEDs with ITO/TPD/Alq3/Al structure were made by vacuum evaporation method. The characteristics of OLEDs with various thickness of organic layer were compared, such as opcrating voltage and electroluminescent efficiency. By changing the organic layers, it is found that with the increasing of the thickness of TPD or Alq3 layer, the operating voltage increased. The quantum electroluminescent efficiency increased with the increase of the thickness of Alq3 layer, but it is different from TPD layer. The phenomenon was explained by the tunneling theory and fiat band model.

关 键 词：柔性OLED 真空热蒸发 工作电压 发光效率 隧穿理论 直带模型 

分 类 号：TN383.1[电子电信—物理电子学] TN873.3