中文摘要：

使用柠檬酸钾（C6H5K3O7）作为电子注入材料，制备了多层有机电致发光器件。当柠檬酸钾阴极修饰层厚度为0．5nm时，得到3．6cd／A的发光效率，高于0．5nmLiF作阴极修饰层时的发光效率（2．5cd／A）。器件的开启电压相比0．5nmLiF作阴极修饰的器件降低了0．5V。实验结果表明，柠檬酸钾（C6H5K3O7）是一种良好的电子注入材料。

英文摘要：

The multilayer organic light-emitting diodes （OLEDs） using potassium citrate （C6HsK307 ） as the electron-injection material have been fabricated. The electroluminescenee （EL） efficiency of 3.6 cd/A was obtained by inserting 0.5-nm-thick C6H5 K3 O7 as electron injecting layer, which is higher than that of 2.5 cd/A in reference device with 0.5-nm-thick LiF. The turn-on vohage was decreased 0.5 V compared with the reference device with 0.5-nm-thiek LiF. The results demonstrated that C6H5 K3O7 is a promising electron injection material.