Ultra Violet light emitting lamps coated with fluorescent material are used for many skin treatment applications e.g. tanning- and photo-therapies. The phosphors possessing emission in the range 200 nm - 400 nm plays very important role so far as phototherapy applications and hence many such devices such as Fluorescent Lamps for Medical use, Black-light Fluorescent Lamps, Medical and scientific UV Lamps. These medical lamp applications are used in the market already since many decades and have been shown to be crucial as a substantial group of patients need the typical spectrum of the light for a proper and effecting healing process and cannot be effectively treated by other technologies. All such devices are strongly depended on luminescence properties of phosphors used in them. The materials suggested in this book have sensitivity more than the commercial materials and may be good candidates as phototherapy phosphor materials and many other UV light emitting phosphor applications. In addition, this book helps a lot to the researchers who are working or willing to work in the field of UV emitting phosphor materials for various applications.