Sr3B2O6:Pr3+荧光粉的紫外上转换发光性能研究OA

Ultraviolet C light,spanning the wavelength range of 200-280 nm,holds significant application value in areas such as sterilization and anti-counterfeiting.Different from conventional mercury lamp and deep ultraviolet light-emitting diodes,we prepared a series of Sr3-xB206:xPr3+(x=0.005-0.05)phosphors via a high-temperature sol-id-state method,and systematically investigated the phase structures,luminescence properties,and upconversion performance of these phosphors,aiming to develop an upconversion ultraviolet light source excited by blue light-emit-ting diodes.Under a 450 nm blue laser excitation,the samples exhibited upconversion ultraviolet emission,with the emission peak located in the 250-370 nm ultraviolet band,attributed to the 4f15d1→4f2 transition of Pr3+ions.The power dependence was further explored,and the results indicated that the ultraviolet emission originated from a two-photon upconversion process.The upconversion ultraviolet emission intensity showed no significant attenuation un-der continuous 450 nm laser irradiation for 2 h.Moreover,when the temperature was elevated to 436 K,the upcon-version ultraviolet emission intensity remained 75％of that at room temperature,demonstrating the excellent stability of the investigated system.Furthermore,an upconversion ultraviolet emitting device was fabricated by encapsulating the phosphor with a 450 nm light-emitting diode chip,and it was successfully applied for high signal-to-noise ratio marking in various complex scenarios.This study provides an important reference for the development of novel deep ultraviolet light sources and their applications in fields such as anti-counterfeiting marking.