新型顶发射有机电致白光二极管的研究

为了提高顶发射白光有机发光二极管(top-emitting white organic light-emitting diodes,TWOLEDs)色谱稳定性，对一种拥有Ag反射镜的新型双蓝光发光单元顶发射器件展开研究，发现结构为Ag/Glass/ITO/MoO₃(5nm)/TAPC(30nm)/TCTA(5nm)/Firpic:TCTA(10%,20nm)/Firpic:TmPyPb(10%,10nm)TPBi(30nm)/LiF(1nm)/Al(0.8nm)/Ag(22nm)/Alq₃(50nm)的蓝光器件具有最佳光电性能，其最高电流效率可以达到9.76cd·A^-1。基于该结构，结合DCJTB荧光染料制备的颜色转换层实现顶发射白光器件。结果表明，当颜色转换层DCJTB浓度为2.5%时，获得了电流效率为2.45cd·A^-1，CIE色坐标为(0.338,0.337)以及显色指数CRI为72的TWOLEDs，器件微腔效应较弱且光谱随电流密度与观测角度改变仅有微弱变化。

Study on new top-emitting white organic light-emitting devices

In order to improve the chromatographic stability of TWOLEDs, we investigated a new dual blue light-emitting unit top emitter device with an Ag reflector. It was found that Ag/Glass/ITO/MoO₃(5 nm)/TAPC(30 nm)/TCTA(5 nm)/Firpic: TCTA(10%, 20 nm)/Firpic: TmPyPb(10%, 10 nm)TPBi(30 nm)/LiF(1 nm)/Al(0.8 nm)/Ag(22 nm)/Alq₃(50 nm) blue light devices have the best optoelectronic performance and can reach a maximum current efficiency of 9.76 cd·A^-1. Based on this structure, a top-emitting white light device was realized by combining a color conversion layer prepared by DCJTB fluorescent dye. The results show that TWOLEDs with current efficiency of 2.45 cd·A^-1, CIE color coordinates of (0.338, 0.337) and color rendering index CRI of 72 were obtained when the concentration of DCJTB in the color conversion layer was 2.5%, and the microcavity effect of the device was weak and the spectrum changed only slightly with the change of current density and observation angle.