为了研究掺杂发光体对红色有机电致发光二极管的增强效果,将DCJTB和C545 T分别掺入Alq3,制备了双发光层的OLED器件,器件结构为玻璃/ITO/4,4',4''-tris[2-naphthylphenyl-1-phenylamino]triphenylamine(2T-NATA)/N,N'-di(naphthalene-l-y1)-N,N'-diphenyl benzidine(NPB)/tris-(8-hydroxyquinoline)aluminum(Alq3):4-(dicyanomethylene)-2-tert-butyl-6(1,7,7,7-tetramethytjulolidin-4-yl-vinyl)-4H-pyran(DCJTB)/Alq3:10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7,-tetramethyl-1H,5H,11H-(1)-benzopyropyrano-(6,7-8-i,j)quinolizin-11-one(C5.5T)/Alq3/LiF/AI,并且将其与单发光层的红、绿光器件相比较.实验结果表明,与单发光层的红光器件相比,加入绿光发光层的红光器件的发光特性被增强了,这种双发光层器件的最优掺杂比例为[Alq3:(2.5%)C545 T]/[AIq3:(1.5%)DCJTB](质量分数),在电压为11.5 V时得到最大发光亮度为6 830 cd/m2,在11 V电压时能得到4.59 cd/A的最大电流效率.但是,这种方法的缺点是削弱了红光的色纯度.
Organic Light Emitting Diodes(OLEDs)with two emitters,doping DCJ TB and C545 T into Alq3 to form a double emitting layers respectively,were presented to investigate enhancement of doped emitter on performance of red organic light emitting diodes.The devices structure used are:Glass/ITO/4,4',4"-tris[2-naphthylphenyl-1-phenylamino-]triphenyhydroxyquinoline)aluminum(Alq3):4-(dicyanomethylene)-2-tert-butyl-6(1,7,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran(DCJTB)/Alq3:10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7,-tetramethyl-1H,5H,11H-(1)-benzopyropyrano-(6,7-8-i,j)quinolizin-11-one(G545 T)/Alq3/LiF/Al,and the devices were compared with single emitting-layer red and green devices.The results indicated the red emission was indeed enhanced by the green emitter as comparing with the single emitting-layer red organic light emitting devices,and the optimal doping proportion for green emitter enhanced red device is[Alq3;(1.5%)DCJTB]/[Alq3:(2.5%)C545T](mass fraction),which exhibited a maximum brightness of 6 830 cd/m2 at a voltage of 11.5 V,a maximum current efficiency of 4.59 cd/A at a voltage of 11 V,respectively,yet the means sacrifice the color purity of red light.
参考文献
| [1] | Wang Qi,Ma Dong ge.Fabrication methods of white organic light emitting diodes[J].Chin.J.Liquid Crystal and Displays,2009,24(5):617-629. |
| [2] | Hwang Do-Hoon,Lee Jong-Don,Cho Hoon-Je,et al.Organic white light-emitting diodes using a new DCM derivatire as an orange-red doping molecule[J].Synthetic Metals,2008,158(21-24):802-809. |
| [3] | WU Yuqi,Zhu Wenqing,ZHANG Zhi-lin,et al.Study on red organic thin-film electroluminescent Devices[J].Chin.J.Liquid Crystal and Displays,2003,18(4):271-274. |
| [4] | Lee Young Gu,Kang Sung Kee,Oh Tae Sik,et al.Comparison of two co-host systems for doped red organic lightemitting devices in an effort to improve the efficiency and the lifetime[J].Organic Electronics,2008,9:339-346. |
| [5] | Li Weizhi,Yu Junsheng,Wang Tao,et al.Electroluminescence of organic light-emitting diodes with an ultra-thin layer of dopant[J].Materials Science and Engineering B,2008,149(1):77-81. |
| [6] | Shen Weng-Chang,Su Y K,Ji Liang-Wem High brightness OLED with dual emitting layers[J].Materials Science and Engineering A,2007,445-446:509-512. |
| [7] | Lee Jiun-Haw,Huang Chih-Lun,Hsiao Chich-Hung,et al.Blue phosphorescent organic light emitting device with double emitting layer[J].Appl.Phys.Lett.,2009,94(22):223301(1-3). |
| [8] | Fukagawa H,Watanabe K,Tsuzuki T,et al.Highly efficient,deep-blue phosphorescent organic light emitting diodes with a double-emitting layer structure[J].Appl.Phys.Lett.,2008,93(13):133312(1-3). |
| [9] | Kim Young Kook,Hwang Seok-Hwan.Highly efficient organic light-emitting diodes using novel hole-transporting materials[J].Synthetic Metals,2006,156:1028-1035. |
| [10] | Kim M S,Lim J T,Jeong C H,et al.White organic light-emitting diodes from three emitter layers[J].Thin Solid Films,2006,515(3):891-895. |
| [11] | Shen Weng Chang,Su Yan-Kuin,Ji Liang-wen,et al.High bright white organic light-emitting diode based on mixing orange and blue emission[J].J.Crystal growth,2006,293(1):48-51. |
| [12] | Shen Weng Chang,Su Y K,Ji Liang-wen,et al.High brightness OLED with dual emitting layers[J].Materials Science and Engineering A,2007,445-446:509-512. |
| [13] | Karg S,Steiger J,Seggern H Von.Determination of trap energies in Alq3 and TPD[J].Synthetic Metals,2000,111-112:277-280; |
| [14] | Hou Jingying,Gao wenbao,Sun Jia-xin,et al.Improved efficiency of organic light emitting diodes by doping each other between the organic layer[J].Chin.J.Lumin.,2003,24(2):157-160. |
| [15] | George Vamvounis,Hany Aziz,Lee J H,et al.Temperature dependence of operational stability of organic light emitting diodes based on mixed emitter layers[J].Synthetic Metals,2004,143(1):69-73. |
| [16] | Liu s W,Huang C A,Lee J H,et al.Blue mixed host organic light emitting devices EJ3.Thin Solid Films,2004,453-454:312-315. |
| [17] | Lee Jonghee,Lee Jeong-Ik,Lee Jun Yeob,et al.Stable efficiency roll-off in blue phosphorescent organic-light emitting diodes by host layer engineering[J].Organic Electronics,2009,10(8):1529-1533. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%