A lighting device 1 has phosphors, a porous material (5), and emitters 4. The emitters are interposed between the phosphors and surfaces (2a) to be irradiated with light of the lighting device. The porous material has heat conductivity and is impregnated with the phosphors.

A lighting device 1 has phosphors, a porous material (5), and emitters 4. The emitters are interposed between the phosphors and surfaces (2a) to be irradiated with light of the lighting device. The porous material has heat conductivity and is impregnated with the phosphors.

The present invention relates to the field of field emission lighting, and specifically to a method for forming a field emission cathode. The method comprises arranging a growth substrate in a growth solution comprising a Zn-based growth agent, the growth solution having a pre-defined pH-value at room temperature; increasing the pH value of the growth solution to reach a nucleation phase; upon increasing the pH of the solution nucleation starts. The growth phase is then entered by decreasing the pH. The length of the nanorods is determined by the growth time. The process is terminated by increasing the pH to form sharp tips. The invention also relates to a structure for such a field emission cathode and to a lighting arrangement comprising the field emission cathode.

There is provided an ultraviolet-emitting material that is formed so as to include Mg.sub.1xZn.sub.xO (0<x<0.55) with a rock-salt structure or Be.sub.1xyzMg.sub.yZn.sub.xCa.sub.zO (0.45y+z<1, 0<x0.55) with a rock-salt structure.

There is provided an ultraviolet-emitting material that is formed so as to include Mg.sub.1xZn.sub.xO (0<x<0.55) with a rock-salt structure or Be.sub.1xyzMg.sub.yZn.sub.xCa.sub.zO (0.45y+z<1, 0<x0.55) with a rock-salt structure.

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 suffers collisions, 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.

An antimicrobial device, such as a flashlight, lantern, or lamp, is discussed herein. The antimicrobial device produces light in the ultraviolet (UV) spectrum (i.e., 150-250 nm), including 200-230 nm. The antimicrobial device includes an electron source, an extractor, and a target material. The electron source provides the electrons of sufficient energy to cause a photon to be released, whether by a target or by the electron itself. The extractor extracts the electrons from the electron source. The target material is a component at which the electron is directed. The target material can release a photon having a desired wavelength or within a desired wavelength range or cause the electron to release a photon having a desired wavelength or within a desired wavelength range.

A production method for an ultraviolet light-emitting body containing Sc:YPO.sub.4 crystals, the method containing: subjecting a raw material to a hydrothermal reaction to obtain a precursor, the raw material containing a Sc source, a Y source, and a PO.sub.4 source; and firing the precursor.

A production method for an ultraviolet light-emitting body containing Sc:YPO.sub.4 crystals, the method containing: subjecting a raw material to a hydrothermal reaction to obtain a precursor, the raw material containing a Sc source, a Y source, and a PO.sub.4 source; and firing the precursor.

A cathodoluminescent lamp includes a filament configured to emit electrons responsive to a voltage applied across the filament, an anode configured to receive electrons emitted from the filament, an emitter comprising cathodoluminescent material, disposed in proximity to the anode, configured to emit photons responsive to stimulation from the electrons and a vacuum envelope configured to enclose the filament, anode, and emitter, and to maintain a vacuum over a path of the electrons. The filament comprises a smooth electron emitting surface. The cathodoluminescent material may comprise a semiconductor material.