Realizing Multidimensional UV/X-Ray Visualization Detection via Ionic Site Migration

Visualizing concealed optical information by using optical materials enables the identification of hidden threats and early risk warnings. However, current approaches to multimode optical detection using fluorescent materials often employ composite luminescence from multiple rare-earth ions, significantly limiting their application. Here, Mn2+ ions are introduced into LiAlO2 and ingeniously utilize multisite occupation to achieve visual detection of both UV and X-ray radiation. Compared to the yellow photoluminescence (PL) and green long-persistent luminescence (LPL) of LiAlO2:Mn2+, the LPL following X-ray irradiation exhibits a similar yellow emission. However, controlling temperature changes reveals a remarkable yellow-to-green color shift in the high-temperature LPL following X-ray irradiation at temperatures above 398 K. The integration of PL with LPL establishes a novel technical paradigm for designing multimode optical visualization detection materials.