采用真空热蒸镀方法以4,4′-bis(carbazol-9-yl)biphenyl(CBP)为主体材料、以bis[2-(4-tert-butylphenyl)benzothiazolato-N,C2′]iridium(acetylacetonate)[(t-bt)2Ir(acac)]磷光染料为掺杂剂构成黄色发光层,制备了高效白光的有机电致...采用真空热蒸镀方法以4,4′-bis(carbazol-9-yl)biphenyl(CBP)为主体材料、以bis[2-(4-tert-butylphenyl)benzothiazolato-N,C2′]iridium(acetylacetonate)[(t-bt)2Ir(acac)]磷光染料为掺杂剂构成黄色发光层,制备了高效白光的有机电致发光器件(OLEDs).OLEDs的器件结构为indium tin oxide(ITO)/N,N′-bis-(1-naphthyl)-N,N′-biphenyl-1,1′-biphenyl-4,4′-diamine(NPB)/CBP:(t-bt)2Ir(acac)/NPB/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP)/8-hydroxyquinoline aluminum(Alq3)/Mg∶Ag,从ITO阳极开始的第一层NPB为空穴传输层,第二层超薄的NPB为蓝色发光层,BCP为空穴阻挡层和激子阻挡层,Alq3为电子传输层.结果表明,器件电压在3V启亮,在16.5V时,器件的最高亮度达到15460cd·m-2;在4V时,器件达到最大流明效率为7.5lm·W-1,器件启亮后所发出的白光光谱在低电压时随电压变化有稍微的移动,但是都在白光范围内变化.在电压达到8V后Commission Internationale de l′Eclairage(国际照明委员会)(CIE)色坐标为(0.33,0.32),并且光谱及色坐标稳定,不随电压变化而改变,与最佳的白光坐标(0.33,0.33)几乎重合.同时,从机理上解释了光谱移动和效率衰减的原因,并探讨了载流子陷阱和能量传递的关系.展开更多
We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）...We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）. The device structure is ITO/2T-NATA （20 nm）/NPBX （20 nm）/CBP： x%Ir（ppy）3：0.5% rubrene （8 nm）/NPBX （5 nm）/DPVBi （30 nm）/Alq（30 nm）/LiF（0.5 nm）/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris （2-phenylpyridine） iridium [Ir（ppy）3], acts as a yellow light-emitting layer, and N,N＇ -bis- （1-naphthyl）- N,N＇ -diphenyl -1, 1＇ -biphenyl-4,4＇ -diamine （NPBX） acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir （PPY）3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.展开更多
文摘采用真空热蒸镀方法以4,4′-bis(carbazol-9-yl)biphenyl(CBP)为主体材料、以bis[2-(4-tert-butylphenyl)benzothiazolato-N,C2′]iridium(acetylacetonate)[(t-bt)2Ir(acac)]磷光染料为掺杂剂构成黄色发光层,制备了高效白光的有机电致发光器件(OLEDs).OLEDs的器件结构为indium tin oxide(ITO)/N,N′-bis-(1-naphthyl)-N,N′-biphenyl-1,1′-biphenyl-4,4′-diamine(NPB)/CBP:(t-bt)2Ir(acac)/NPB/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP)/8-hydroxyquinoline aluminum(Alq3)/Mg∶Ag,从ITO阳极开始的第一层NPB为空穴传输层,第二层超薄的NPB为蓝色发光层,BCP为空穴阻挡层和激子阻挡层,Alq3为电子传输层.结果表明,器件电压在3V启亮,在16.5V时,器件的最高亮度达到15460cd·m-2;在4V时,器件达到最大流明效率为7.5lm·W-1,器件启亮后所发出的白光光谱在低电压时随电压变化有稍微的移动,但是都在白光范围内变化.在电压达到8V后Commission Internationale de l′Eclairage(国际照明委员会)(CIE)色坐标为(0.33,0.32),并且光谱及色坐标稳定,不随电压变化而改变,与最佳的白光坐标(0.33,0.33)几乎重合.同时,从机理上解释了光谱移动和效率衰减的原因,并探讨了载流子陷阱和能量传递的关系.
基金the Ministry of Science and Technol- ogy of Jilin under Grant No. 20050523the Grant for the Scien- tific Research from the educational office of Jilin (Project No.25, [2003]+2 种基金 54, [2004])the Grant from the department of Science and Technology of Siping [Project No.2005007 2006008]
文摘We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）. The device structure is ITO/2T-NATA （20 nm）/NPBX （20 nm）/CBP： x%Ir（ppy）3：0.5% rubrene （8 nm）/NPBX （5 nm）/DPVBi （30 nm）/Alq（30 nm）/LiF（0.5 nm）/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris （2-phenylpyridine） iridium [Ir（ppy）3], acts as a yellow light-emitting layer, and N,N＇ -bis- （1-naphthyl）- N,N＇ -diphenyl -1, 1＇ -biphenyl-4,4＇ -diamine （NPBX） acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir （PPY）3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.
