为了研究阴极材料对有机电致发光器件的影响,在不改变其他功能层的情况下,分别采用不同比例的Ca/Al合金和纯Al作为器件的阴极制备了4种绿光OLED器件,器件结构分别为:ITO/2T-NATA(15nm)/NPB(25nm)/Alq3:C545T(20nm)/Alq3(30nm)/Ca(X%):Al(100nm)和ITO/2T-NATA(15nm)/NPB(25nm)/Alq3:C545T(20nm)/Alq3(30nm)/Al(100nm).从电流一电压、电压一亮度、器件的外量子效率和光谱特性等几个方面,对不同比例的Ca/Al合金作为阴极的器件与Al作为阴极的器件进行了对比分析,发现当Ca的质量分数为10%时,器件的亮度达到最大值10 100cd/m2,并且器件的效率最高.对上述现象产生的原因进行了探讨,分析了器件光谱与不同阴极和不同驱动电流间的关系,从机理上阐述了OLED器件阴极的选取准则.
参考文献
| [1] | Yuan T L,Wang X F,MU Q.Action mechanism of NEA composite cathode influencing electron injection efficiency in OLED[J].Materials Reviezo,2008,22(8):14-15. |
| [2] | LIU Q,Zhang F H,L Y L.Vacuum evaporation and film properties of Mg/Ag cathodes in organic light emitting display[J].Semiconductor Technology,2006,31(10):743-746. |
| [3] | Biswas P K,De A,Dua L K,et al.Work function of sol-gel indium tin oxide(ITO)films on glass[J].Appl.Surface Science,2006,253(4):1953-1959. |
| [4] | Naga S,Tamekawa M,Terashita T,et al.Electrical properties of organic electroluminescent devices with aluminium alloy cathode[J].Synth.Met.,1997,(91):129-130. |
| [5] | Stossel M,Staudigel J,Steuber F,et al.A quantitative numberical model of muhilayer vapor-deposited organic light emitting diodes[J].Appl.Phys.A,1999,(68):387-390. |
| [6] | Shi J,Tang C W.Dodeped organic electroluminescent devices with improved stability[J].Appl.Phys.Lett.,1997,(70):1665-1667. |
| [7] | Wang H,Yu J S,Li L,et al.Effect of BCP layer on organic light-emitting devices performance[J].Optoelectronics·Laser,2008,19(11):1429-1432. |
| [8] | 姜文龙,王静,丁桂英,等.电压对有机蓝光器件发光光谱的影响[J].液晶与显示,2007,22(3):235-239. |
| [9] | 丁桂英,汪津,王广德,等.基于rubrene掺杂剂的高亮度白色有机电致发光器件[J].液晶与显示,2008,23(1):5-10. |
| [10] | 许慧侠,陈柳青,陈简,等.两种宽谱带蓝光发射材料的制备、表征及光学特性[J].发先学报,2008,29(1):32-36. |
| [11] | Huang C H,Li F Y,H W.Introduction to Organic Light-Emitting Materials and Devices[M].Shanghai:Fudan Press,2005:87-89. |
| [12] | 李文连.用于有机EL的电极材料[J].液晶与显示,2000,15(2):108-113. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%