Dynamic Modulation of Afterglow Emission in Polymeric Phosphors via Inverse Opal Photonic Structures

Abstract

Tuning the afterglow of polymeric phosphors is critical for advancing their use in optical data storage and display technologies. Despite advancements in polymer matrix design and dopant engineering, achieving dynamic control over afterglow intensity remains a significant challenge. In this study, a novel approach is introduced for dynamically tuning the afterglow of polymeric phosphors by integrating them into an inverse opal photonic structure. By precisely aligning the photonic stopband of the inverse opal structure with the afterglow band of the polymer film, a remarkable 15-fold enhancement in afterglow intensity is achieved. This enhancement is tunable, decreasing from 15 to 1.2 by infiltrating the photonic structure with media of varying refractive indices ranging from 1.00 (air) to 1.37 (ethyl acetate). The tunability arises from reducing the mismatch between the stopband and the afterglow band, as the weighted refractive index shifts between 1.15 and 1.40. Additionally, the inverse opal photonic structure induces angle-dependent structural colors in the Janus polymeric phosphors, modulated by the refractive index of the infiltrating media. This integration of dynamically tunable afterglow with angle-dependent structural coloration unlocks new potential for advanced optoelectronic applications.