蓝光磷光微腔有机电致发光器件特性的研究

使用典型蓝色磷光材料Firpic作为磷光金属微腔 有机电致发光器件(OLED)的发光层, 以高反射的Al膜作为阴极顶电极和半透明的Al膜作为阳极底电极,其结构为 Glass/Al(15nm)/MoO₃(30nm)/NPB(40nm)/mCP:Firpic(30nm,x%)/BCP(10nm)/Alq(20nm)/LiF (1nm)/Al(100nm),x%为Firpic的掺杂 质量分数,分别为4%、6%、10%、12%和14%。实验 制备了不同的OLED,比较了测量角度和不同掺杂浓度对OLED发光特性的影响。结 果显示,对发光面积为0.8cm²的器件,测量角度的不同导致蓝光 辐射波长蓝移,色坐标发 生变化,器件的510nm和472nm两个峰值变化 不相同,随着角度的增大, 较大的峰值不断衰减,而较小的峰值不断增强；并且,当掺杂浓度为12%时,OLED得 到最好的发光性能,12V电压驱动下有最大亮度18870cd/m²,说明此时的主客体间能量转移最充分。

Characteristics of blue phosphorescent microcavity organic electrolu minescent light emitting device

The blue phosphor Firpic-based electro-phosphorescent metallic micro cavity organic light-emitting device (OLED) employs a structure of glass/Al (15nm)/MoO₃(30nm)/NPB (40nm)/mCP:Firpic (30nm,x%)/BCP(10nm)/Alq(20nm)/LiF( 1nm)/Al(100nm),in which x% (4%, 6%,10%,12%,14%) is the doping mass fraction of Firpic.We prepared different OLE Ds and compared the influence of measuring angle and dopant concentra tion on the luminescence properties of OLEDs.The results show that for the devices with ligh t-emitting area of 0.8cm²,the difference of measuring angles results in shift of blue emission a nd changes of color coordinates.There were two peaks of the devices,which are at 510nm and 472nm.T heir variations are different.The larger peak is attenuated while the smaller peak is continuously e nhanced with the increase of the measuring angle.Furthermore,when the doping concentration is 12%,the OLE D has the best performance.The device has the maximum brightness of 18870cd/m^2u nder 12V,which implies the energy transfer between host and guest is the fulles t.