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作 者:汪津[1] 王福军[1] 张冰[2] 王双[1] 常喜[1] 丁桂英[1] 姜文龙[1]
机构地区:[1]吉林师范大学信息技术学院,功能材料物理与化学教育部重点实验室,吉林四平136000 [2]四川大学电气信息学院,四川成都610065
出 处:《光电子.激光》2013年第3期445-450,共6页Journal of Optoelectronics·Laser
基 金:国家自然科学基金(10804036);吉林省基础研究计划基金(20100510);吉林省自然科学基金(20101512;201215221)资助项目
摘 要:采用蓝色有机荧光染料N-BDAVBi作为客体发光材料,将其分别掺入主体材料ADN和DPVBi中形成双发光层,制备了结构为ITO/m-MTDATA(40nm)/NPB(10nm)/ADN:N-BDAVBi(15nm)/DPVBi:N-BDAVBi(15nm)/TPBi(30nm)/LiF(0.6nm)/Al的高效率蓝色有机荧光器件(OLED)。器件的最大电流效率为8.13cd/A,对应色坐标为(0.178,0.302),电流密度为18.81mA/cm2,分别是ADN:N-BDAVBi和DPVBi:N-BDAVBi作为发光层的单发光层结构器件的2.4和1.8倍。器件性能提高主要源于双发光层结构减弱了载流子在界面处的积累,扩大了激子产生区域以及主体与客体之间有效的能量转移。当驱动电压为14V时,双发光层器件的最大亮度为20 620cd/m2。High-efficiency blue fluorescent organic light emitting devices (OLEDs) with double emission layers (DELs) have been demonstrated with structure of ITO/4,4',4-Tris (N-3-methylphenyl-N-phenyl-amino) triphenylamine (m-MTDATA) (40 nm)/N, N'-Bis(naphthalen-l-yl)-N, Nr-bis(phenyl) benzidine(NPB) / (10 nm) / 9,10-Di (naphth-2-yl) anthracene (ADN) : N- ( 4- ( (E) )-2- ( 6- ( ( E)-4- ( diphenylamino) styryl) naphthalen-2-yl) vinyl) phenyl)-N-phenylbenzenamine ( N-BDAVBi ) ( 15 nm) /4,4 r-Bis ( 2, 2- diphenyl- ether- 1- yl) biphenyl (DPVBi) : N-BDAVBi ( 15 nm) / 2,2', 2- ( 1,3,5- Benzinetriyl) - tris (1-phenyl-l-H-benzimidazole(TPBI)(30 nm)/LiF(0. 6 nm)/A1. N-BDAVBi as blue emitting dopant is doped into ADN host and DPVBi host simultaneously to form DELs. The DEL devices show significant improved efficiency compared with the conventional devices with a single emitting layer (SEL). The maximum current efficiency of 8. 13 cd/A with a Commission International deL'Eclairage (CIE) coordinate of (0. 178,0. 302) at current density of 18.81 mA/cm2 is obtained in DEL device,which is about 140; and 80% greater than that of the devices with ADN:N-BDAVBi and DPVBi:N-BDAVBi as emission layer, respectively. The improvement of the current efficiency is attributed to the reduced accumulation of charge carriers at the interfaces,the expansion of the exciton generation region, and the efficient energy transfer from host to dopant. The maximum luminance of 20 620 cd/m2 has been acieved at 14 V in DEL device. The CIE chromaticity coordinate of DEL device changes only from (0. 181, 0. 308) to (0. 172,0. 292) as the luminance increases from 1000 cd/m2 to 5 000 cd/m2.
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