以F4-TCNQ为P型掺杂剂,掺入m-MTDATA作为空穴传输层,ITO导电玻璃作为阳极,Alq,作为发光层,Bphen作为电子传输层,LiF和Al分别用作电子注入层和阴极,制备有机电致发光器件.相比于未掺杂器件,电压及功率效率获得提高.这归功于P型掺杂使阳极与空穴传输层界面产生欧姆接触,及空穴传输层传导率的提高,而随着掺杂的引入及掺杂浓度的增加,注入的空穴变得过剩,使载流子不平衡变得越发严重,导致器件电流效率及亮度降低.因此,应该加强电子的注入及传输,以达到载流子平衡,同时达到降低器件电压、提高功率效率、电流效率及亮度的目的.
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