Organic Light-Emitting Diodes with Magnesium Doped CuPc as an Efficient Electron Injection Layer

Bright organic electroluminescent devices are developed using a metal-doped organic layer intervening between the cathode and the emitting layer. The typical device structure is a glass substrate/indium-tin oxide （ITO）/copper phthalocyanine （CuPc）/N,N＇-bis-（1-naphthl）-diphenyl-1,1＇-biphenyl-4,4＇-diamine （NPB）/Tris（8-quinolinolato） aluminum（Alq3）/Mg-doped CuPc/Ag. At a driving voltage of 11 V, the device with a layer of Mg-doped CuPc （1：2 in weight） shows a brightness of 4312cd/m^2 and a current efficiency of 2.52cd/A, while the reference device exhibits 514 cd/m^2 and 1.25 cd/A.     

基于轮廓匹配的夜晚环境下猫眼目标识别方法

为了解决“猫眼”目标在夜晚环境下难识别的问题,提出了一种基于归一化中心矩的轮廓匹配“猫眼”目标识别方法。首先利用中值滤波对图像进行去噪,采用固定阈值分割完成了对图像的分割,使得“猫眼”目标与部分背景分离,使用Roberts边缘检测提取出了所有物体的边缘,最后采取了基于归一化中心矩的轮廓匹配算法,该算法不受平移和放缩的影响,提取出了图像中的所有圆形目标,并利用面积判别识别了真实目标,对识别出的目标绘制最小外接圆,利用圆心坐标对其定位。通过对不同光照强度下的“猫眼”图像进行实验与对比,验证了该方法的可行性,并通过目标识别评价指标验证了该方法的有效性。实验结果表明,该方法的全局准确率可达92.1%,可以在夜晚环境不同光照强度下成功地对“猫眼”目标进行识别。     

Organic light emitting diodes using magnesium doped organic acceptor as electron injection layer and silver as cathode

Organic light emitting diodes employing magnesium doped electron acceptor 3, 4, 9, 10 perylenetetracarboxylic dianhydride (Mg:PTCDA) as electron injection layer and silver as cathode were demonstrated. As compared to Mg:Ag cathode, the combination of the Mg:PTCDA layer and silver provided enhanced electron injection into tris (8-quinolinolato) aluminium. The device with 1:2 Mg:PTCDA and Ag showed an increase of about 12% in the maximum current efficiency, mainly due to the improved hole-electron balance, and an increase of about 28% in the maximum power efficiency, as compared to the control device using Mg:Ag cathode. The properties of Mg:PTCDA composites were studied as well.