Conceptual Ultraviolet‐C Light Source Based on Up‐Conversion Luminescence

Abstract

Ultraviolet‐C illumination may provide a promising solution for the disinfection technology, and thus the development of novel type of ultraviolet‐C light sources is continuously expected. Herein, a conceptual design of ultraviolet‐C light source based on up‐conversion luminescence of phosphor material is introduced. Accordingly, a composite film is prepared using YBO3:Pr3+ phosphor and a transmissive remote phosphor‐converted light source is built by combing the phosphor film with a 447 nm laser. Spectral measurements show that the phosphor‐converted design emits ultraviolet‐C light peaking at 263 and 274 nm with tunable emission intensities. Moreover, ultraviolet imaging demonstration implies that the present design has a potential to serve as an ultraviolet‐C germicidal light source for surface decontamination.

Enhanced biocidal activity of Pr3+ doped yttrium silicates by Tm3+ and Yb3+ co-doping

“…6 Similar studies were performed also for other types of lanthanide containing matrices ( e.g. , YBO 3 or Ca 2 SiO 4 ), 23,24 including UV light emission from Gd 3+ , Tm 3+ or Pr 3+ doped materials, 25 with particularly promising results obtained from yttrium silicate (Y 2 SiO 5 and Y 2 Si 2 O 7 ) phosphors, establishing those materials as being among the most efficient for Vis-to-UVC UC emission generation. 26,27 The Vis-to-UVC UC is of particular interest, since it does not require multiple (>2) photon sequential absorption to observe UVC emission (as in the case of NIR-to-UV UC), which increases the overall process efficiency.…”

Excellent red upconversion luminescence in GdLaO3:Er3+/Yb3+/Sc3+ under 980 nm laser excitation

“…2(a). The absorption peaks in the DR spectra, ranging from 200 to 1800 nm, are mainly attributed to the transitions of Er 3+ from 4 show that Sc 3+ doping can increase the bandgap values. It is noteworthy that when the concentration of Sc 3+ exceeds 10 mol%, the samples prepared by replacing La 3+ ions molar with Sc 3+ consistently exhibit a higher bandgap compared to the samples prepared by replacing Gd 3+ ions molar with Sc 3+ .…”

Ambient light stimulation enabling intense and long-lasting ultraviolet-C persistent luminescence from Pr3+-doped YBO3 in bright environments

“…[25][26][27][28][29][30][31] More excitingly, the absence of UVC signals in outdoor sunlight or artificial indoor lighting can ensure that there is no spectral overlap between the UVC luminescence signal from the phosphor and the ambient light. [32][33][34] On this basis, the storage phosphors emitting in the UVC spectral region can be potential candidates for investigating the effect of polychromatic ambient light on the PSL signal. However, desirable UVC storage phosphors that can work in a bright indoor or outdoor ambient light environment for an extended period of time are relatively lacking because of the continuous photostimulation from ambient light.…”