荧光染料掺杂的高效率、高亮度黄色OLEDs

High Efficiency and Luminance Yellow OLEDs Based on Fluorescence Dopant

利用真空蒸镀的方法制备了结构为:ITO/m-MTDATA(20 nm)/NPB(15 nm)/DPAVBi:Rub(x nm,2%)/Alq3(25 nm)/Li F(0.5 nm)/Al(100 nm)的器件.研究了掺杂层的不同厚度(x=15,25和30 nm)对器件性能的影响.结果是当掺杂层的厚度为25 nm时,器件的性能最好.当电流密度为524.22 m A/cm2时,获得最大电流效率,为4.37 cd/A;获得最大亮度,为22 890 cd/m2.器件的高亮度与高效率主要是因为主客体之间的能量转移很充分.

The OLED devices were fabricated with the sturcture of ITO/m-MTDATA（ 20 nm ）/NPB（ 15 nm ）/DPAVBi：Rub（ x nm,2%）/Alq3（25 nm）/LiF（0. 5 nm）/Al（100 nm）by using the method of vacuum evaporation. The performances of the devices were studied by adjusting the the different thickness（x=15,25 and 30 nm）of the yellow light emission layer（ DPAVBi：Rub）. When the thickness is 25 nm,the performance of the device is the best. The maximum luminous efficiency is 4. 37 cd/A and the maximum luminance is 22 890 cd/m2 when the current density is 524. 22 mA/cm2 . The energy transfer between the host and the guest is so sufficient that the devices have the high luminance and efficiency.