DPVBi的厚度和发光位置不同对有机电致发光器件性能的影响  

The Impact of Different DPVBi Thickness and Position on the Organic Light-emitting Devices

作　　者：王广德[1] 王立[1] 姜文龙[1] 王立忠[1] 汪津[1] 韩强[1] 丁桂英[1] 

机构地区：[1]吉林师范大学信息技术学院,吉林四平136000

出　　处：《发光学报》2007年第2期189-192,共4页Chinese Journal of Luminescence

基　　金：吉林省科技发展计划(20050523);吉林省教育厅科研计划(吉教科合字[2003]第25号);吉林省教育厅科研计划(吉教科合字[2004]第54号);四平科技局计划(四科合字第20030017号)资助项目

摘　　要：通过调整发光层DPVBi的厚度和在器件中的位置,在同一实验条件下设计了不同的器件结构,制备了有机电致发光器件,在实验中可看到DPVBi的厚度不同,器件的色度发生了改变,并且发现DPVBi在器件的不同位置,器件的发光特性也是不同的。通过实验可以得知处于器件不同位置的DPVBi,其发光机理是不同的,这是由于DPVBi和Alq3的最高未占有轨道(HOMO)能级相差不多,而它们的最低占有轨道(LUMO)能级相差0.4eV,这样DPVBi的存在有利于电子的注入,同时由于rubrene和DPVBi的HOMO相差0.5eV,这样空穴和电子就在rubrene和DPVBi的界面处形成激子复合而发光。也就是说,在rubrene之后的DPVBi对空穴有了阻挡作用,使器件中的空穴和电子达到平衡。通过改变DPVBi的厚度,制备了白光器件,这组白光器件,在7～17V变化范围内器件的色坐标从(0.35,0.37)到(0.33,0.35)变化不大,接近白光等能点(0.33,0.33),是色度比较好的器件。By adjusting thickness and luminous place of the luminous DPVBi layer in the same laboratory conditions, organic light-emitting devices have been produced. We designed different device structures and have produced a luminous device in the experiment. Firstly, we designed a group of devices with same structures perfectly, except different DPVBi layer thickness, as a result, their spectrum changed. When DPVBi layer thickness was 5 nm yellow-light was emitted. When DPVBi layer thickness was 10 nm white-light was emitted because blue and yellow light were emitted symmetrically. With increase gradually of DPVBi layer thickness, ingredient of blue-light was increasing, and the emission color of the devices transferred little by little into blue. As a result, the emission hue of device changed due to different thickness of DPVBi layer. Secondly, DPVBi layer was laid on the different places in the device, the luminous performance of the device was different. From the experiment we can see that the DPVBi layer in different place had the different luminous essences： the luminous DPVBi layer before rubrene emitted blue light as a light-emitting layer; but the luminous DPVBi layer after rubrene didn＇t emitted light. According to compare of HOMO and LUMO energy grade used in the materials, the luminous DPVBi layer after rubrene performed an function of hole block only. This would affect the luminous brightness and efficiency of the organic light-emitting devices to a large extent. If by adjusting reasonably thickness and luminous place of the luminous DPVBi layer, the light hue of devices may be adjusted to gain colors expected. On the other hand, white-light devices were expected to produce, which was significant.

关 键 词：有机电致发光器件 发光层的厚度和位置 性能 

分 类 号：TN381.1[电子电信—物理电子学] TN873.3