Synthesis and properties of novel blue-emitting materials:anthracene-based derivatives

Two kinds of novel blue-emitting materials, anthracene-based derivatives, are synthesized by the Suzuki coupling reaction. It is worth noting that the maximum emission wavelengths of the two materials are 441 and444 nm in tetrahydrofuran and 456 and 454 nm in film states, which are the typical blue fluorescence and the fluorescence quantum yields of them are 0.87 and 1.12 by using 9,10-diphenylanthracene eΦf=0.90 T as a calibration standard. The full width at half maximum of them are 56, 55 nm in solution, respectively, presenting good color purity. Both of them display superior thermal properties and electrochemical properties.Scanning electronic microscope results show that the films of two compounds are continuous, compact, and smooth after 100°C for 3 h. These data indicate their potential to be prepared for high efficiency and long operation lifetime organic light-emitting diodes devices.     

工程中的高梯度问题及Bezier耦合单元建模

高梯度是工程中关键的特征之一，本文讨论和研究描述高梯度问题的函数逼近，包括：多项式函数逼近、复合函数逼近、Bezier函数逼近。基于Bezier函数描述，构建了一维Bezier耦合单元、六节点三角形耦合单元、八节点矩形耦合单元，这些单元都具有较好的高梯度描述能力，最后还给出有关的算例。     

交流电在Al2O3模板中沉积金属机理探讨

以铝阳极氧化形成有序的多孔氧化铝为模板,利用交流电在模板孔洞中沉积金属Ag得到纳米Ag粒子/Al2O3组装体系,透射电镜观察证实在氧化铝模板中有金属纳米Ag粒子存在.分析了交流电能在孔洞中沉积金属的原因是由于Al/Al2O3界面的整流特性,测量了Al/Al2O3界面的I－U关系曲线.