调整空穴注入层MeO-TAD厚度改善蓝色OLED的性能

Improvement of Blue OLED Performance by Adjusting the Thickness of HoleInjecting Layer MeO-TAD

主要介绍结构为MeO-TAD(xnm)/NPB(40nm)/DPVBi(30nm)/Alq(30nm)/LiF(0.5nm)/AL的蓝色有机电致发光器件,空穴注入层MeO-TAD的厚度x按照0nm、1.0nm、1.5nm、2.0nm变化,其它层保持不变.当x=2nm时,其器件性能最好,在15V时亮度达到最大,为5876cd/m2.器件的开启电压较低,在5V的驱动电压下亮度达到10.5cd/m2,器件在8V电压时电流效率达到最大,为3.22cd/A;且器件的色坐标稳定,在5V到13V的驱动电压下几乎不发生改变,稳定在x=0.17、y=0.18附近,属于很好的蓝光发射.

The article mainly introduced the emitting blue light devices which structure was MeO-TAD（x nm）/NPB（40 nm）/DPVBi（30 nm）/Alq（30 nm）/LiF（0.5 nm）/Al.The thickness of hole injecting layer MeO-TAD was changed by 0 nm,1.0 nm,1.5 nm,2.0 nm,which other layers kept fixed.When the thickness of MeO-TAD was 2.0 nm,the device earned the best performance,the maximum brightness reached 5 876 cd/m^2 at 15 V.The turn on voltage of the device was lower,the luminance of device was 10.5 cd/m^2 at 5 V,the maximum electroluminescence efficiency was 3.22 cd/A at 8 V,and the chroma of devices stabilizes in the best blue light district of x=0.17,y=0.18 with the changes of the driving voltage in the scope from 5 V to 13 V.