Solar-blind ultraviolet-C persistent luminescence phosphors.

ABSTRACT: Visible-light and infrared-light persistent phosphors are extensively studied and are being used as self-sustained glowing tags in darkness. In contrast, persistent phosphors for higher-energy, solar-blind ultraviolet-C wavelengths (200-280?nm) are lacking. Also, persistent tags working in bright environments are not available. Here we report five types of Pr³⁺-doped silicates (melilite, cyclosilicate, silicate garnet, oxyorthosilicate, and orthosilicate) ultraviolet-C persistent phosphors that can act as self-sustained glowing tags in bright environments. These ultraviolet-C persistent phosphors can be effectively charged by a standard 254?nm lamp and emit intense, long-lasting afterglow at 265-270?nm, which can be clearly monitored and imaged by a corona camera in daylight and room light. Besides thermal-stimulation, in bright environments, photo-stimulation also contributes to the afterglow emission and its contribution can be dominant when ambient light is strong. This study expands persistent luminescence research to the ultraviolet-C wavelengths and brings persistent luminescence applications to light.

SUBMITTER: Wang X 

PROVIDER: S-EPMC7184723 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature