An ultraviolet light-generating target comprising a substrate transmitting ultraviolet light; and a light-emitting layer provided on the substrate and emitting ultraviolet light in response to an electron beam, wherein the light-emitting layer is an amorphous layer formed of Al.sub.2O.sub.3 doped with Sc.

The present application discloses an illumination light source including a base substrate; an anode layer on the base substrate; and a field emission illumination module having a carbon nanotubes layer on the base substrate; and a fluorescent powder layer on a side of the carbon nanotubes layer distal to the base substrate. The anode layer is on a side of the fluorescent powder layer distal to the carbon nanotubes layer.

The present invention relates to a field emission lighting arrangement, comprising an anode and a cathode, where the shape of the cathode is selected based on the shape of a evacuated envelope in which the anode and cathode is provided. The inventive shape of cathode allows for an improved uniformity of an electric field provided between the anode and cathode during operation of the field emission lighting arrangement. The invention also relates to a corresponding method for selecting a shape of such a cathode.

The present invention relates to a field emission lighting arrangement, comprising an anode and a cathode, where the shape of the cathode is selected based on the shape of a evacuated envelope in which the anode and cathode is provided. The inventive shape of cathode allows for an improved uniformity of an electric field provided between the anode and cathode during operation of the field emission lighting arrangement. The invention also relates to a corresponding method for selecting a shape of such a cathode.

An ultraviolet light emitting device without the use of a p-type semiconductor layer is described. For generating ultraviolet light, an electron beam generator is provided, and an electron beam generated in the electron beam generator is guided to an active layer of an ultraviolet light generator. In the active layer, the electron beam is collided, and electron-hole pairs generated by the collisions are confined in well layers due to barrier layers of the active layer. The confined electrons and holes generate ultraviolet light through recombination.

A target for ultraviolet light generation 20A includes a sapphire substrate 21 that transmits ultraviolet light UV, an interlayer 22 that is in contact with the sapphire substrate 21, includes oxygen atoms and aluminum atoms in a composition, and transmits ultraviolet light UV, and a luminous layer 23 that is provided on the interlayer 22, includes oxide crystals containing rare earth elements to which an activator agent is added, and receives electron beams EB so as to generate ultraviolet light UV.

An ultraviolet light-generating target comprising a substrate transmitting ultraviolet light; and a light-emitting layer provided on the substrate and emitting ultraviolet light in response to an electron beam, wherein the light-emitting layer is an amorphous layer formed of Al.sub.2O.sub.3 doped with Sc.

An ultraviolet light-generating target comprising a substrate transmitting ultraviolet light; and a light-emitting layer provided on the substrate and emitting ultraviolet light in response to an electron beam, wherein the light-emitting layer is an amorphous layer formed of Al.sub.2O.sub.3 doped with Sc.

A cathode-ray ultraviolet light source comprising: an elongated glass envelope having a first end and second end, the glass envelope defining an evacuated volume; an electron gun positioned within the evacuated volume proximate to the first end and being capable of developing an electron beam; a target disposed within the evacuated volume between the first and second end of the glass envelope, the target comprising a phosphor material covered with a reflective metal film; and an electron beam focusing and deflecting mechanism disposed within the evacuated volume between the electron gun and the target to direct the electron beam towards the reflective metal film of the target.

A cathode-ray ultraviolet light source comprising: an elongated glass envelope having a first end and second end, the glass envelope defining an evacuated volume; an electron gun positioned within the evacuated volume proximate to the first end and being capable of developing an electron beam; a target disposed within the evacuated volume between the first and second end of the glass envelope, the target comprising a phosphor material covered with a reflective metal film; and an electron beam focusing and deflecting mechanism disposed within the evacuated volume between the electron gun and the target to direct the electron beam towards the reflective metal film of the target.