Ultraviolet Persistent Emitting Phosphors and Upconversion Charging

We have developed ultraviolet (UV) persistent emitting phosphors utilizing upconversion charging, with blue or white LEDs as excitation sources. Unlike conventional phosphors that require a dark environment, these UV phosphors can glow even in broad daylight. The upconversion charging mechanism, facilitated by readily available LEDs, eliminates the need for high-energy radiation sources and bulky instruments, opening doors to innovative and practical applications.

In this talk, we will use various typical phosphor systems to demonstrate and analyze the dynamical processes of upconversion changing and UV emitting, including energy transfer, competition between trap filling and photo-stimulated detraping, and the effects of ambient conditions. Furthermore, we will explore several potential applications that have become feasible due to these pioneering advancements.