TBPe作蓝光材料的双层白色有机电致发光器件的性能  

Characteristics of a Double Layers White Organic Electroluminescent Device Using TBPe as Dopant in a Blue Mixed Layer

作　　者：牛霞[1] 华玉林[1] 吴空物[1] 朱飞剑[1] 吴晓明[1] 印寿根[1] 邓家春[1] 刘嵩[1] 

机构地区：[1]天津理工大学材料物理研究所,天津300191

出　　处：《发光学报》2006年第4期537-542,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(60576038);天津市自然科学基金(033601211);中英合作项目(国家自然科学基金委和英国皇家学会联合资助);天津市"材料物理与化学"重点学科基金资助项目

摘　　要：选用一种新型高效的蓝光有机小分子荧光染料TBPe,首次制备了以PVK∶TBPe为蓝光发光层和A lq3∶rubrene为橙红光发光层的双层白光有机电致发光器件,器件结构为ITO/PVK∶TBPe/A lq3∶rubrene/Mg∶Ag。通过适当调节各有机层的掺杂比例和厚度,得到了发光性能比较理想的白光器件。器件在7 V左右启亮,而且随着外加电压的变化,色坐标基本保持不变,在外加驱动电压为16 V时,器件的亮度为738 cd/m2,外量子效率为0.2%。我们还尝试选用本身可以发绿白光,而且兼具电子传输特性的母体材料Zn(BTZ)2替代A lq3,器件的最大亮度提高到1 300 cd/m2,色坐标为(0.32,0.36),更加接近白色等能点,器件其他光电性能也得到了显著地提高。White organic light-emitting devices（WOLED） have been attracting tremendous attention nowadays since from first being reported. They have many advantages such as their lightness and thinness, self lightemission, broad viewing angle, quick response, high efficiency, easy fabrication, low driving voltage, low energy consumption, low cost, etc. Therefore, they are becoming potential competitors in full color displays, backlights for liquid crystal displays and even next-generation of light sources. We fabricated a new type of white organic electroluminescent device using TBPe as blue fluorescent dopant. The configuration of the device is ITO/PVK： TBPe/Alq3： rubrene/Mg： Ag. In the device, PVK, Alq3 and rubrene are used as hole transport material, electron transport material and orange fluorescent dopant, respectively. By adjusting the thickness of each emitting layer and the adulterated proportion properly, a white light with CIE coordinates of （0.26, 0.33 ） was generated, which is located in the white-light region. The CIE coordinate stayed virtually constant when the voltage increased from 8 V to 16 V. The device had a maximumluminance of 738 cd/m^2, a maximum external efficiency of 0.2%. For enhancing the brightness and chromaticity of the device, we attempted to use Zn （ BTZ ） 2 instead of Alq3 as electron transport material. Bright white light, over 1 300 cd/m^2, was successfully obtained, and the maximum efficiency reached to 0.31% at 8 V. In conclusion, the performance of the whole device was increased remarkably. We try to blend the polymer and small molecule organic material together as blue-light-emitting layer, which makes up the shortcoming for each other. The efficiency of white light-emitting is improved only by designing the device structure and changing the electron transport material reasonable. We make the device structure as simply as possible to satisfy the need of the practical use.

关 键 词：白光发射 有机电致发光器件 TBPe Zn(BTZ)2 

分 类 号：TN383.1[电子电信—物理电子学] TN873.3