Fluorescence behaviors of perylene-dispersed super engineering plastic films.

We attempted to manufacture films in which fluorescent dye is dispersed using engineering plastic as a matrix which has high heat and chemical resistance as well as excellent mechanical performance. In this study, films containing highly dispersed perylene in colorless and transparent aromatic polyamide (PA) and polyimide (PI) were manufactured. The perylene-dispersed PA film emitted strong blue light with a maximum fluorescence at 457 nm. On the other hand, the perylene-dispersed PI film showed significant fluorescence quenching with its maximum fluorescence wavelength significantly red-shifted to 546 nm. The perylene-dispersed PI film treated with ethylene diamine at 80 °C showed strong blue fluorescence, and when the film was further heated at 200 °C, the fluorescence was quenched. These films are expected to be applied as back light unit or color conversion layer for OLED and Micro LED due to their excellent physical properties. [Display omitted] • Aromatic polyamide and polyimide films in which perylene was dispersed were prepared. • The polyamide film emitted strong blue light. • The polyimide film showed significantly quenched orange fluorescence. • When treated with ethylene diamine, the polyimide film emitted strong blue light. • When heated at a higher temperature, the fluorescence was quenched again. [ABSTRACT FROM AUTHOR]