摘要
采用蓝色bis[3,5-difluoro-2-(2-pridyl)phenyl-(2-carboxypyribyl)iridumⅢ](FIrpic)和黄色bis[2-(4-tertbutylphenyl)benzothiazolato-N,C2']iridium(acetylacetonate)[(t-bt)2Ir(acac)]两种磷光染料,制备了双发光层结构的白色有机电致发光器件,器件结构为ITO/TAPC(30 nm)/host:(t-bt)2Ir(acac)[(10-x)nm,4%]/spacer(x nm)/host:FIrpic(15 nm,8%)/Bphen(40 nm)/Mg∶Ag(200 nm)。分别选用p型1,1-bis[(di-4-tolylamino)phenyl]cyclohexane(TAPC)和n型tris[3-(3-pyridyl)-mesityl]borane(3TPYMB)作为主体材料制备了两种类型的器件,通过在两个发光层之间加入一层较薄的间隔层进行器件优化。结果表明,加入间隔层之后,器件性能得到提高,获得了色稳定性较好的白光器件。当主体为TAPC时,使用间隔层后器件取得最大亮度为19 550 cd/m2,最大电流效率为8.3 cd/A;当主体为3TPYMB时,使用间隔层后器件的最大亮度为1 950 cd/m2,最大电流效率为30.7 cd/A。实验结果表明,器件性能的提高,是由于加入了间隔层之后载流子复合区域拓宽,促进了发光层中电子和空穴的平衡。
White organic light-emitting devices （WOLEDs） with double light-emitting layers （EMLs） were fabricated, which were based on phosphorescent blue bis [ 3,5-difluoro-2- （2-pyridyl） phenyl- （2-carboxypyridyl） iridium Ⅲ] （ FIrpic ） and yellow bis [ 2- （ 4-tertbutylphenyl ） benzothiazolato-N, C2＇ 1 iridium （acetylacetonate） [ （t-bt） 2Ir（acac） 1. Device structure was given as ： ITO/TAPC （30 nm）/host：（t-bt）zIr（acac） [ （10 - x） tam, 4% ]/spacer （x nm）/host： FIrpic （15 nm, 8%）/ Bphen （40 nm）/Mg： Ag （200 nm ）, while p-type 1,1-bis [ （di-4-tolylamino） phenyl ] cyclohexane （ TAPC ） and n-type tris[ 3-（3-pyridyl） -mesityl] borane （ 3TPYMB ） was separately employed as the host, and device optimization was made by introducing a spacer between the two EMLs. The results showed that, compared with that of spacer-without device, the devices employed a spacer yielded higher device performance as well as stable white emission. For TAPC as the host, a device with spacer obtained maximum luminance of 19 550 cd/m^2 and power efficiency of 8.3 cd/A, while 3TPYMB as the host, a device with spacer achieved maximum luminance of 1 950 cd/m^2 and power efficiency of 30.7 cd/A. It was suggested that by incorporating a spacer in the WOLEDs, charge carrier recombination zone was broadened, and electron-hole balance was improved in the EMLs.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2012年第1期45-50,共6页
Chinese Journal of Luminescence
基金
国家自然科学基金创新群体(61021061)
国家自然科学基金(61177032)
教育部博士点基金(20090185110020)
中央高校基本科研业务费重点项目(ZYGX2010Z004)资助项目
关键词
白色有机电致发光器件
磷光染料
双发光层
间隔层
white organic light-emitting devices
phosphorescent emitters
double EMLs
spacer
