有机电致发光器件材料的椭偏研究

本文报道了用可变入射角椭圆偏振仪（Variable angle incidence Spectroscopic Ellipsometer）测量Alq3,NPB,CuPc,Rubrene薄膜的光学常数，我们采用真空蒸镀法在硅衬底上分别制备了以上四种薄膜，然后我们用可变入射角椭圆偏振仪对四种薄膜进行了测量，测量在大气中进行，光谱范围从200到1000nm（或1.24到5cV），测量角度为65℃、70℃、75℃、80℃，接着，用Wvase32软件对四种薄膜的光学常数随波长（光子能量）的变化函数进行拟合，通过拟合我们得到了真空蒸镀的Alq3,NPB,CuPc,薄膜的光学常数随波长的变化函数及曲线，并且从材料吸收谱的吸收边，我们还得到了这些材料的光学禁带宽度。     

High-Efficient Organic Light-Emitting Diodes Using Indium Tin Oxide Treated by KMnO4 Solution as Anode

High-efficient organic light-emitting diodes (OLEDs) with indium-tin-oxide (ITO) anode treated by KMnO4 solution are demonstrated. The performance of the OLEDs depends on the concentration of KMnO4 solution and time of ultrasonic treatment. The OLED whose ITO anode was treated by ultrasonic in KMnO4 solution with concentration of 50mg/L for 15 rain displays the best performance. It has higher electroluminescent brightness and lower turn-on voltage than those of traditional devices. In particular, its efficiency can be increased by approximately 40％. The surfaces of the ITO anode with and without treating are analysed by scanning electron microscopy.     

High－Efficiency White Organic Light－Emitting Devices Based on Multiple Quantum－Well Structure

We report the white organic-light devices (WOLEDs) employing a multiple quantum-well (MQW) structure,which consist of alternate layers of 4,48-bis(2,28-diphenylvinyl)-1,18-biphenyl (DPVBi) and (DPVBi:Rubrene) as the potential barrier and the potential well, respectively. The results demonstrate that the MQW structure can prominently increase the performance of WOLEDs, the double quantum well device exhibits the efficiency up to 5.4 cd/A, and yields a peak luminance of 14206 cd/m^2, It is also interesting to find that the MQW structure can enhance the colour stability of WOLEDs at different voltages.