摘要
采用7-N,N-二乙胺基-香豆素-3-羧酸(DCCA)为掺杂剂,4,4′-二(9-咔唑基)联苯(CBP)为基质,设计制备了掺杂蓝光器件ITO/2-TNATA(5 nm)/NPB(40 nm)/CBP∶DCCA(30 nm)/Bu-PBD(30 nm)/LiF(1 nm)/Al(100 nm),探讨了掺杂质量分数为1%和2%时器件的发光性能.结果表明2个掺杂器件均具有8 V左右的启亮电压,DCCA掺杂质量分数为1%时器件的性能较好,电致发光(EL)峰与其稀溶液的光致发光(PL)峰一致,位于456 nm,而且EL发光强度随电压的改变而改变,最大亮度594 cd.m-2时的电压为12.5 V.当电流密度为20 mA.cm-2时,器件的发光效率为1.01 cd·A-1.
Blue electroluminescence (EL) from organic light-emitting diodes (OLEDs) with the emitter consisiting of 7-(diethylamino)-coumarin-3-carboxylic acid(DCCA) as dopant and a hole transporting layer 4,4'-bis(9-carbazolyl)biphenyl(CBP) as the host have been investigated. The structure of the devices is indium tin oxide (ITO)/4,4', 4''-tris-N-naphthyl-N-phenylamino-triphenylamine (2-TNATA) ( 5 nm)/N, N'- bis-(naphthyl)-N, N%diphenyl-1, 1'-biphenyl-4,4'-diamine(NPB) (40 nm)/4,4'-bis(9-carbazolyl) biphenyl (CBP) : DCCA(30 nm)/2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1, 3,4-oxadiazole(Bu-PBD) (30 nm)/LiF (1 nm)/Al(100 nm). The performance of the devices is investigated at different current densities and doping concentrations. The results show that the device with 1 % doping concentration has the maximum brightness of 594 cd·m^-2 at 12. 5 V, and the luminance efficiency of 1.01 cd · A^-1 at 20 mA·cm^-2.
出处
《西北师范大学学报(自然科学版)》
CAS
北大核心
2009年第1期73-77,共5页
Journal of Northwest Normal University(Natural Science)
基金
国家自然科学基金资助项目(60776006)
长江学者和创新团队发展计划资助项目(IRT0629)
兰州交通大学"青蓝工程"资助项目(QL-05-23A)
关键词
香豆素衍生物
光致发光
电致发光
蓝光掺杂器件
coumarin derivative
photoluminescence
electroluminescence
blue doped OLEDs