Design, Synthesis, and Luminescence Analysis of Rare Earth Doped Persistent Phosphors

Author(s)	Shahenaz Mulla, Sudhir Kumar, Prashant Narayan Rai
Country	India
Abstract	Due to the unique mechanism of photoelectron storage and release, long persistent phosphorescence (also known as long persistent luminescence or long-lasting afterglow) plays a crucial role in fields such as spectroscopy, photochemistry, photonics, and materials science. The phenomenon of persistent luminescence, where a luminescent material continues emitting light after the excitation source is removed, has fascinated researchers for centuries. In this review, we explore the mechanisms of afterglow, material systems, and applications of long persistent phosphors (LPPs). We discuss possible mechanisms that involve changes in trap distribution during the trapping and de-trapping processes, complex photo-ionization reactions of trap site levels and impurity centers, as well as the corresponding carrier migration kinetics. Additionally, we focus on defect characterization techniques, which help qualitatively or quantitatively describe the types, concentrations, and depths of the traps.
Keywords	Persistent phosphorescence, long persistent luminescence, afterglow, photoelectron storage, spectroscopy, photochemistry, photonics, materials science, trap distribution
Field	Engineering
Published In	Volume 5, Issue 6, November-December 2024
Published On	2024-11-08

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