Organic light emitting devices ( OLEDs) were fabricated with yttrium fluoride ( YF3 ) as the electron injection layer instead of lithium fluoride ( LiF) and aluminum as the cathode. The ex-periment results show that YF3 injection buffer layer with appropriate thickness can effectively en-hance the electron injection ability of the cathode, leading to more balanced concentration of elec-trons and holes, and optimized electroluminescent properties of OLEDs. The device with 1. 2 nm-thick YF3 layer has the minimum turn-on voltage of 2. 6 V, the maximum current efficiency of 8. 52 cd·A-1 , and the maximum luminance of 36 530 cd·m-2 . Compared with LiF reference sample, the maximum brightness and current efficiency are increased by 39% and 53%, respectively.%利用氟化钇( YF3)代替 LiF 作为电子注入层材料,以金属铝作为阴极,制备了有机电致发光器件( OLED)。实验结果表明：适当厚度的YF3电子注入缓冲层可以增强阴极的电子注入能力,使得电子和空穴的浓度更加平衡,有效地提高器件的电致发光性能。其中,1.2 nm厚YF3的器件具有最小的起亮电压2.6 V,最高的电流效率8.52 cd·A-1,最大的亮度36530 cd·m-2。最大亮度和电流效率与LiF参考样品相比,分别提高了39%和53%。
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