Solid-state far-ultraviolet C light sources for the disinfection of pathogenic microorganisms using graphene nanostructure field emitters

グラフェンナノ構造電界発光体を用いた病原微生物の殺菌のための固体遠紫外線C光源

根尾 陽一郎*; 橋本 凱*; Koike, Rei*; 大原 高志   ; 松本 貴裕*

Neo, Yoichiro*; Hashimoto, Gai*; Koike, Rei*; Ohara, Takashi; Matsumoto, Takahiro*

The ongoing global outbreak of coronavirus disease has necessitated the use of ultraviolet (UV) disinfection techniques to reduce viral transmission in public places. The previously used UV wavelength is harmful to the human body, the wavelength range from 200 to 235 nm, often referred to as far-UVC light, has attracted attention as a novel disinfection wavelength range that can be used in a safe manner. Here, an efficient mercury-free far-UVC solid-state light source is presented. This light source demonstrates intense 230 nm emission with a narrow spectral width of 30 nm and a long lifetime of more than 1000 h. These characteristics can be achieved by graphene nanostructure field emitters and wide-bandgap magnesium aluminate phosphors.