发光层厚度对联苯乙烯衍生物蓝色有机发光器件性能的影响  

Influence of active layer thickness on the performance of distyrylarylene derivative blue organic light-emitting device

作　　者：吴有智[1] 张文林[1] 倪蔚德[1] 张材荣[2] 张定军[1] 

机构地区：[1]甘肃省有色金属新材料省部共建国家重点实验室,兰州理工大学材料科学与工程学院,兰州730050 [2]兰州理工大学理学院应用物理系,兰州730050

出　　处：《物理学报》2012年第9期475-481,共7页Acta Physica Sinica

基　　金：甘肃省自然科学基金(批准号:1010RJZA035);教育部留学回国人员科研启动基金(批准号:第40批);国家自然科学基金(批准号:11164015;11164016)资助的课题~~

摘　　要：本文制备了联苯乙烯衍生物(4,4'-bis(2,2'-diphenylvinyl)-l,l'-biphenyl,DPVBi)为发光层的蓝色有机电致发光器件.器件性能随发光层厚度变化而变.在DPVBi厚度为10—50 nm范围内,同样电流密度下器件亮度及效率随DPVBi厚度增加先增后减,40 nm时最佳,最高亮度达到15840 cd/m^2,最高外量子效率达到3.2%,器件色坐标(Commission Internationale de l'Eclairage(CIE)co-ordinates)为(0.15,0.15).DPVBi厚度超过40 nm时器件发光光谱出现红移而致色度变差,其原因可归于微腔效应所致.同时,通过实验结果分析表明DPVBi中激子扩散长度位于20—30 nm范围.Thickness of emissive layer in organic electroluminescent device is one of the important factors affecting the device performance. In this report, a blue electroluminescent device with an active layer of 4, 4＇-bis（2, 2＇-diphenylvinyl） -1, 1＇- biphenyl （DPVBi） is fabricated. The device performance varies with the thickness of DPVBi. With the increase of the DPVBi thickness between 10-50 nm, the device luminance and efficiency at the same current density first increase and then decrease, the device with a DPVBi thickness of 40 nm exhibits the highest luminance of 15840 cd/m^2 and a maximum external quantum efficiency of 3.2%, with Commission Internationale de 1＇Eclairage （CIE） co-ordinates being （0.15, 0.15）. The luminescent spectral red shift and the color purity deteriorate when the thickness is over 40 nm, which can be attributed to a result of microcavity effect. In the meantime, the analysis from experimental results shows that the exciton diffusion length in DPVBi is between 20---30 nm

关 键 词：发光学 有机电致发光 蓝色 发光效率 

分 类 号：TN383.1[电子电信—物理电子学]