中文摘要：

采用四（8-羟基峰啉）硼锂（LiBq4）代替LiF作为电子注入材料，以金属铝作为阴极，制备了有机电致发光器件．器件采用N，N’（α-萘基）-N，N＇-苯基联苯二胺（NPB）作为空穴传输层，三（8-羟基喹啉）铝（Alq3）作为电子传输层和发光层．采用LiBq4作为电子注入层，实验结果表明，器件的亮度、电流效率和起亮电压等性能均有改善，超过了采用LiF作为电子注入层的器件．器件性能的提升可以用电子注入增强和电荷平衡来解释．

英文摘要：

High performance organic light-emitting diodes （OLEDs） with lithium tetra-（8-hydroxy-quinolinato） boron （LiBq4）, instead of LiF, as the electron injection layer, and aluminum as the cathode were fabricated. In the fabrication of the devices, N,N＇-bis-（1-naphthyl）-N,N＇-diphenyl-l,l＇-biphenyl-4,4＇-diamine （NPB） was used as the hole transport layer, and tri-（8-quinolinolato） aluminum （Alq3） as the emitting and electron transport layer. By using LiBq4 as the electron injection layer, the device＇s performance with regard to luminance, current efficiency, and turn-on voltage was superior to that of the device using LiF as the electron injection layer. The experimental results could be explained by the improved electron injection and charge balance.