P‐48: Analysis of Degree of Imidization of Polyimide Organic Film Through Retardation Measurement

The degree of imidization of polyimide used in VIA and PDL materials is important characteristic because of relationship with life cycles in OLED. During the curing process, a polyimide film optically changes to a negative C‐plate like sheet structure. The more polyimide chains packed closely, the higher out‐of‐plane retardation (Rth) is. In other words, for analyzing retardation properties of polyimide except for imidization ratio, Rth could be a useful analyzing method. In this study, using polyimide formed from different curing temperature and various chemical compositions, relation between Rth and properties of polyimide film was investigated.