Sterilizing compositions comprising phosphors for converting electromagnetic radiation to UVC radiation and methods for using the same
There is disclosed a composition for converting electromagnetic energy to ultraviolet C (UVC) radiation or radiation of a shorter wavelength, the composition comprising at least one phosphor capable of converting an initial electromagnetic energy (A) to an electromagnetic energy (B) comprising UVC radiation or radiation of a shorter wavelength, and an organic or inorganic media containing said phosphor. There is also a method of sterilizing an article by exposing it to UVC radiation or radiation of a shorter wavelength for a time sufficient to deactivate or kill at least one microorganism and/or for a time sufficient to inhibit abnormal cell growth within the body, when said composition is in an implantable medical device. A method of coating an article with such compositions is also disclosed.
1. A composition for converting electromagnetic energy to UVC radiation or electromagnetic radiation of a shorter wavelength, said composition comprising: at least one phosphor capable of converting an initial electromagnetic energy (A) to a different electromagnetic energy (B), said different electromagnetic energy (B) comprising UVC, X-ray, or gamma radiation; and
an organic or inorganic media containing said phosphor, wherein said organic media comprises a plastic resin, and said inorganic media comprises a ceramic, metal or fabric.
2. The composition of claim 1 , wherein the initial electromagnetic radiation of frequency (A) comprises infrared radiation or visible light.
3. The composition of claim 1 , wherein said at least one phosphor has an average particle size ranging from 1 nm to 1 cm.
4. The composition of claim 1 , wherein said at least one phosphor is present in an amount ranging from 0.01% to 60% by weight, relative to the total weight of the composition.
5. The composition of claim 1 , wherein said plastic resin comprises a polymer or co-polymer of polyvinyl chloride (PVC), acrylonitrile butadiene styrene (ABS), olefin, polycarbonate, styrene, nylon, and acetal.
6. The composition of claim 1 , wherein said ceramic comprises glass or porcelain.
7. The composition of claim 1 , wherein said organic or inorganic media comprises a liquid for forming a sprayable slurry of said composition.
8. An article comprising the composition of claim 1 , said article comprising a consumer product, a children's toy, an animal toy, a medical device, a receptacle for biological fluids, a receptacle for holding drinking water, a bathroom fixture, a kitchen fixture, eating or cooking utensils, a cleaning product, or an article of clothing.
9. An article comprising the composition of claim 1 , said article comprising a cover for a medical device or consumer product that: is transparent or translucent to said initial electromagnetic energy A and converts said initial energy to UVC radiation or radiation of a shorter wavelength.
10. The article of claim 9 , wherein said cover further comprises a coating on at least one surface that is transparent or translucent to the initial energy but that prevents UVC from exiting the cover.
11. The article of claim 10 , wherein said at least one coating comprises a metal or oxide chosen from MgO, TiO 2 , SiO 2 and Al 2 O 3 .
12. The article of claim 9 , wherein said consumer product and medical device is chosen from a toothbrush, comb, razor, stethoscope, and dental implant.