Thin film light-emitting diodes with organic/inorganic heterostructure in which ZnO:Zn layer was used as electron transporting and hole blocking layer, PDDOPV, Poly(2,5- Didodecyloxy-1,4 Phenylenevinylene ) was used a...Thin film light-emitting diodes with organic/inorganic heterostructure in which ZnO:Zn layer was used as electron transporting and hole blocking layer, PDDOPV, Poly(2,5- Didodecyloxy-1,4 Phenylenevinylene ) was used as hole transport and emission layer have been successfully prepared. Comparing to single layer device, the luminescent efficiency of bilayer device is improved about twenty-six times, the emission spectrum’s peak wavelength shifts to short wavelength, the half width at full maximum (HWFM) widens. The improvement of luminescent efficiency is due to the insertion of ZnO:Zn layer.展开更多
文摘通过设定图像预测错误门限,并结合支持向量机（Support Vector Machines,SVM）对图像数据进行分类,提出一种二维（2-D）马尔科夫链模型的信息隐藏检测系统。在嵌入率为0.1bpp时,分别应用扩频（spreadspectrum,SS）和量化索引调制（Quantization Index Modulation,QIM）进行实验,系统实现数字水印的正确检测率超过90%;而应用LSB方法,在嵌入率为0.01bpp-0.3bpp条件下,系统实现的数字水印正确检测率在50%~90%以上。
文摘Thin film light-emitting diodes with organic/inorganic heterostructure in which ZnO:Zn layer was used as electron transporting and hole blocking layer, PDDOPV, Poly(2,5- Didodecyloxy-1,4 Phenylenevinylene ) was used as hole transport and emission layer have been successfully prepared. Comparing to single layer device, the luminescent efficiency of bilayer device is improved about twenty-six times, the emission spectrum’s peak wavelength shifts to short wavelength, the half width at full maximum (HWFM) widens. The improvement of luminescent efficiency is due to the insertion of ZnO:Zn layer.
