Endowed Polyimide Films with Fluorescence Properties by Introducing Yttrium Oxide Powder

Polyimide exhibits high optical transparency, exceptional thermal properties, robust mechanical characteristics, and dimensional stability. However, conventional polyimides typically do not possess luminescent properties, which significantly restricts their applicability in the domain of optoelectronic devices. A viable approach to address this limitation involves the incorporation of fluorescent powders into polyimide films, thereby ensuring that the films maintain their practical utility while also exhibiting certain fluorescent properties. In this study, we synthesized yttrium oxide (Y₂O₃), which possesses fluorescence characteristics, and incorporated it into polyimide films. The introduction of Y₂O₃ not only imparts fluorescence to the films but also enhances their thermal stability while preserving their mechanical integrity. The glass transition temperature of the modified films is approximately 300°C, and the tensile strength exceeds 85 MPa, surpassing the industry application standards.