两种不同结构及掺杂的白色有机发光二极管

白色有机发光器件由于在其上加彩色滤光片可容易地达到全彩效果而备受关注，本文通过两种不同结构及掺杂的器件，实现了白色有机电致发光，一种为具有空穴锁定层并在其中掺杂的器件；另一种为蓝色染料和红色染料分别加在发光层与电子传输层中的普通3层结构器件。结构分别为ITO／NPB／TPBi;Rubrene/Alq/Mg;Ag和ITO/NPB/DPVBi;Perylene/Alq :DC JTB/Mg:Ag。具有空穴锁定层的器件和普通型器件的最大亮度、最大流明效率、色度分别为8635cd/m^2、0.851m/W、（x=0.31,y=0.32)10倍，空穴锁定层的器件寿命远小于普通型的。此文对此差异进行了分析。

White Emitting Organic Thin Film Electroluminescent Devices Doped with Dye

In this paper,two kinds of white emission were reported.One wasconstructed with a doped blocking layer,the other was conventional three-layer structure with blue dye in the emissive layer and red dye in the electron transport layer.The structure of the devices are ITO／NPB／TPBi：Rubrene／Alq／Mg：Ag and ITO／NPB／DPVBi：Perylene／Alq：DCJTB／Mg：Ag.Their highest luminance,the maximum efficiency,the CIE coordinate are 8 635 cd／m2，0．85 lm／W,(x＝0．31，y＝0．32) and 4 946 cd／m2,1.39 lm／W，（x＝0．34，y＝0．31） respectively.However,the durabilities of luminance under a constant driving current density (6 mA／cm2) increases by a factor of about 10.The runnign lifetime of the device with blocking layer is shorter than the conventional devices.The reasons of the difference are discussed based on tunnelling theory and the energy-level diagram of the device.