主客体掺杂和空穴阻挡对蓝色磷光OLED发光性能的影响研究  

Influence of doping and hole-blocking on the luminesent performance of blue OLED

作　　者：杨少鹏[1] 居秀琴[1] 赵方超[1] 邱晓丽[1] 王利顺[1] 刘素玲[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002

出　　处：《功能材料》2009年第9期1422-1424,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(60678006);河北省博士基金资助项目(06547002D-4);河北省自然科学基金资助项目(E2007000196)

摘　　要：以铱配合物蓝色磷光材料Firpic作为掺杂剂,制备了基于CBP为主体的蓝色有机电致发光器件,其结构为ITO/CuPc/FIrpic:CBP(x%)/BCP/Alq3/LiF/Al,其中x%为发光层主客体掺杂浓度。分别研究了主客体掺杂浓度和空穴阻挡层BCP的厚度对器件发光性能的影响,当掺杂浓度为8%时,主客体间的能量传转移最充分,器件的启亮电压为5V,器件在20V时的亮度为7122.25cd/m2。器件电致发光(EL)光谱出现明显的红移现象,为Alq3部分参与了发光,影响了发光的色纯度,改变BCP的厚度,可以调节载流子复合区域和器件发光的色度坐标,达到改善器件发光性能的目的。Blue orgnic eleetroluminescent devices（OLED） were fabricated by using blue phosphorescent dye Firpic doped with the host material CBP as the emitting layer. The configuration of the devices was ITO/CuPc/Firpic ： CBP （x%）/BCP/Alq3/LiF/AI, in which x% was the doping concentration of Firpie. The doping concentration between the host and guest and the thickness of hole blocking layer BCP on the the properties of light-emitting devices were separately studied. When the doping concentration was 8M, the energy transfer betwwen host and guest was most efficient, the turn-on voltage of the device was 5V, the brightness of it at 20V was 7122.25ed/m^2. Obvious red-shift took place in the eleetroluminescent spectra of the devices, this is because part of Alq3 participate in the luminescence, which reduce the color purity of blue luminescence. The carrier compound area and the CIE coordinates of the devices can be regulated by changing the thickness of BCP. So the device performance will be improved by controlling the BCP thickness.

关 键 词：有机电致发光器件 掺杂 空穴阻挡层 发光性能 

分 类 号：TN383.1[电子电信—物理电子学]