蓝光LED激发深紫外上转换发光材料的光学定位与追踪应用

Deep ultraviolet（UV） luminescent materials with emission wavelength shorter than 320 nm have great potential for photochemistry and photomedicine because of the unique spectral features of UV light including high-energy photon and interference-free by indoor ambient light， which have aroused significant attention in the past few years. In this paper， we have synthesized deep UV emissive LiYSiO₄∶Pr³⁺ and Li（Y，Gd）SiO₄∶Pr³⁺ phosphors by doping Pr³⁺ and Pr³⁺-Gd³⁺ ion pairs into LiYSiO₄ host. Upon 450 nm blue light（laser or LED） excitation， these phosphors can emit light in the ultraviolet C and narrowband ultraviolet B through photon upconversion. The deep UV upconversion luminescence properties were investigated in detail by varying the excitation power of 450 nm blue laser， indicating that two-photon upconversion luminescence process is responsible for the deep UV emission. Deep UV light source has been successfully created through a combination of LiYSiO₄∶Pr³⁺ phosphor as luminescence converter and 450 nm LED as excitation source， which shows promising application in the optical locating and tracking field.