Zhu Rui, Lin Jian-Ming, Wang Wei-Zhi, Zheng Chao, Wei Wei, Huang Wei, Xu Yun-Hua, Peng Jun-Biao, Cao Yong
Institute of Advanced Materials (IAM), Fudan University, Shanghai, China.
J Phys Chem B. 2008 Feb 14;112(6):1611-8. doi: 10.1021/jp076234n. Epub 2008 Jan 18.
Spin-coating one polymer solution on another spin-cast polymer film is believed to result in unfavorable interfacial mixing. Here, we show some results to demonstrate that some interesting properties will be obtained in such mixed bilayer films formed by sequential spin-coating. Poly(9-vinylcarbazole) and poly(9,9-dioctylfluorene-2,7-diyl) were chosen as the first and second polymer layers, respectively. By varying the initial thickness of the first layer, some interesting variations were observed. The spectroscopic features of beta-phase polyfluorene were utilized to reflect the variations at the complicated interface. Morphologies were also presented to illustrate that the variations of spectroscopic features were accompanied with some interesting morphological changes. On the basis of these results, a schematic model was proposed to gain insight into the mixed interface formed by sequential spin-coating. Polymer light-emitting devices based on such films were also investigated.
人们认为，将一种聚合物溶液旋涂在另一种旋铸聚合物薄膜上会导致不利的界面混合。在此，我们展示了一些结果，以证明通过连续旋涂形成的这种混合双层薄膜会获得一些有趣的特性。分别选择聚（9-乙烯基咔唑）和聚（9,9-二辛基芴-2,7-二亚基）作为第一和第二聚合物层。通过改变第一层的初始厚度，观察到了一些有趣的变化。利用β相聚芴的光谱特征来反映复杂界面处的变化。还展示了形态学，以说明光谱特征的变化伴随着一些有趣的形态变化。基于这些结果，提出了一个示意模型，以深入了解通过连续旋涂形成的混合界面。还研究了基于这种薄膜的聚合物发光器件。
