Efficient Visible Light Charging for Rare Earth‐Free Persistent Phosphor

Abstract Persistent phosphor, as an eco‐friendly energy storage material, usually needs high‐energy photonic rays in the storage process, such as ultraviolet (UV) light, X‐ray, or even γ‐ray. This strict requirement for light source which is harmful to human health greatly limits the popularity of persistent phosphors in the daily life. Here, a novel broadband orange persistent emissive phosphor LiGaO₂:1%Mn²⁺ (LGOM) is reported which supports efficient wide band excitation from UV to green light. The afterglow excited by 470 nm light even reaches ≈80% as intensity as UV excitation. The afterglow of LGOM excited by common blue lamp (450–460 nm) can be pictured by the smart phones for more than 48 h. The mechanism of visible light storage is discussed through the thermal‐luminescence measurements. In addition, interestingly, its persistent emissive color can shift from orange‐yellow to orange‐red after ceasing the excitation source. This unique broadband orange afterglow phosphor which supports efficient wide range visible‐light excitation, afterglow color shift, and long‐lasting luminescence is expected to have potential applications in the fields of emergency direction, anticounterfeiting, decoration design, etc.