基于DOPPP的高效白光OLED器件

High efficient white OLEDs based on DOPPP

采用真空热蒸镀的方法,以荧光染料1-(2,5-dimethoxy-4-(1-pyrenyl)-phenyl)pyrene(DOPPP)为蓝发光层,5,6,11,12-Tetraphenylnaphthacene(Rubrene)为黄发光层,制备了结构为ITO/m-MTDATA(10nm)/NPB(30nm)/Rubrene(0.2nm)/DOPPP(xnm)/TAZ(10nm)/Alq3(30nm)/LiF(0.5nm)/Al的双发光层的高效白色有机电致发光器件(OLED)。通过调整DOPPP层的厚度,研究器件的发光性能。当DOPPP层厚小于25nm时,器件以黄光发射为主;当DOPPP层厚为25nm时器件的性能最佳,在电流密度为209.18mA/cm2时,获得最大亮度为9 232cd/m2,在电流密度为103.712mA/cm2时获得最大电流效率4.68cd/A,并随着驱动电压的升高,器件的色坐标从(0.366,0.365)变化到(0.384,0.399),都在白光的范围之内;当DOPPP层厚度超过25nm时,器件的效率和亮度都开始下降。

The double-light-emitting-layer white organic electrolumineseent devices with the structure of ITO/m-MTDATA （10 nm）/NPB（30 nm）/Rubrene （0.2 nm）/DOPPP （x nm）/TAz （10 nm）/Alq3 （30 nm）/LiF（0.5 nm）/A1 have been fabricated by using the method of vacuum thermal evaporation. The fluorescent dye 1-（2,5-dimethoxy-4-（1-pyrenyl）-phenyl）pyrene （DOPPP） is the blue emitting layer and the 5,6,11,12-Tetraphenytnaphthacene （Rubrene）is the yellow emitting layer. The luminescence performances of the devices are studied by adjusting the thickness of DOPPP layer. When the thickness of DOPPP layer is less than 25 nrn,the device has yellow emission mainly. When the thickness is 25 nm,the performance of the device is the best. The maximum luminance is 9 232 cd/m^2 when the current density is 209.18 mA / cm^2 , and the maximum current efficiency is 4. 68 cd / A when the current density is 103. 712 mA/cm^2. With the increasing of voltage ,color coordinates change from （0. 366,0. 365） to （0. 384,0. 399）. They are in the scope of white light. It is a better white light emission. When the thickness is more than 25 nm,the efficiency and luminance of the devices begin to reduce.