Abstract: Provided is a light source apparatus having a phosphor layer which is subjected to a light beam of a predefined wavelength emitted from a solid light source element as an excitation light beam and which generates fluorescent beam by being excited by the incident excitation light beam and emits the fluorescence beam to outside, and a metal layer which is joined to a predefined surface among outer surfaces of the phosphor layer except an incident surface of the excitation light beam and an outgoing surface of the fluorescence beam for converting excitons excited from a section of the phosphor layer close to the predefined surface into a light beam via surface plasmon polaritons. The light beam converted from the excitons via the surface plasmon polaritons is emitted out of the outgoing surface of the phosphor layer together with the fluorescence beam.

Abstract: A light source can include: a light source that emits light of a predetermined wavelength within a wavelength region covering the wavelength of ultraviolet light and that of visible light; and a wavelength conversion layer containing a fluorescent material of at least one type that is excited by excitation light from the fixed light source to emit fluorescent light of a wavelength longer than that of light emitted from the fixed light source. The fixed light source and the wavelength conversion layer can be spaced from each other. The light source device can employ a reflection system of extracting at least fluorescent light from an incident surface of the wavelength conversion layer through which excitation light from the fixed light source enters the wavelength conversion layer. The wavelength conversion layer can have a surface structure with depressions or projections.

Abstract: A light source unit including an excitation light source for emitting light in a blue wavelength band, a fluorescent wheel, a light emitting device for emitting light in a red wavelength band and a light guiding optical system for guiding light emitted from the fluorescent wheel and the light emitting device to a light guiding device. The fluorescent wheel has a fluorescent area where a green fluorescent material layer for emitting fluorescent light in a green wavelength band is disposed and a diffuse area for converting light emitted from the excitation light source into diffuse light of which directivity is weak are disposed end to end in a circumferential direction. A concentration of weight content of the green fluorescent material and a thickness thereof are such that a luminescent intensity of fluorescent light emitted from the green fluorescent material layer is enhanced.

Abstract: A light source device can include a solid-state light source configured to emit blue light as excitation light and a phosphor section which is excited by the excitation light from the solid-state light source and which emits fluorescent light longer in wavelength than the light emitted from the solid-state light source. In the light source device, a wavelength selective member configured to transmit the excitation light from the solid-state light source and to reflect the fluorescent light from the phosphor section can be provided between the phosphor section and the solid-state light source. The size of the wavelength selective member can be less than the size of the phosphor section which can be greater than the size of the excitation light spot irradiated with the solid-state light source.

Abstract: A color converted light emitting apparatus is provided that has excellent light emission characteristics and can be manufactured while a viscosity suitable for a printing method is maintained. The color converted light emitting apparatus can include a light emitting element and a color conversion layer containing a phosphor that is excited by light emitted from the light emitting element and which emits fluorescent light. The color conversion layer can further contain, as first and second thickeners, two types of particles with different average primary particle diameters. The average primary particle diameter of the second thickener can be less than one half of the average primary particle diameter of the first thickener. By appropriately adjusting the average primary particle diameters and the amounts of the thickeners added, the light emission characteristics and the emission chromaticity can be improved.

Abstract: A semiconductor light source apparatus can emit various color lights having a substantially uniform color tone and high brightness. The semiconductor light source apparatus can include a radiating substrate, at least one phosphor layer disposed on the radiating substrate and a semiconductor light source emitting blue light. The at least one phosphor layer can be composed of at least one of a glass phosphor and a phosphor ceramic. The light source can be located adjacent the phosphor layer so that the blue light having high brightness can be efficiently reflected on the radiating substrate via the phosphor layer while preventing the blue light from a mirror reflection on the phosphor layer. Thus, the disclosed subject matter can provide a semiconductor light source apparatus that can emit various uniform color lights having high brightness and a lighting unit using the light source apparatus, which can be used for general lighting, vehicle lighting etc.

Abstract: The disclosed subject matter includes reliable semiconductor light-emitting devices having a favorable light distribution using an LED chip, which can emit light having a different color as compared to that emitted directly by the LED chip. The semiconductor light-emitting device can include an LED chip having an electrode, a phosphor layer located on the LED chip except for the electrode, a bonding wire connected to the electrode, and a light-reflecting resin. The light-reflecting resin can be disposed on a light-emitting surface that is exposed around the electrode and on the electrode including the bonding wire, and can prevent the LED chip from exhibiting a leak of light that is not wavelength-converted via the phosphor layer, while increasing light that passes through the phosphor layer. In addition, the light-reflecting resin can protect the bonding wire from vibration, etc.

Abstract: A particle detector comprises a light source, and a metal layer having an incident/reflective surface and a photoelectric surface opposing the incident/reflective surface. Incident light from the light source reaches the incident/reflective surface to excite near-field surface plasmon resonance photons at the photoelectronic surface. A particle deposited on the photoelectronic surface of the metal layer changes the near-field surface plasmon resonance photons to far-field scattered light. The particle detector further comprises a unit, provided above the photoelectric surface of the metal layer, for detecting the far-field scattered light.

Abstract: A light source unit includes an excitation light source and a luminescent wheel on which luminescent light emitting areas including, on a reflecting surface, red and green luminescent materials which respectively emit light of red and green wavelength band, when receiving excitation light, and a diffuse transmission area which diffuses and transmits excitation light, are aligned end to end in a circumferential direction. An excitation light incident surface of a luminescent material layer of the luminescent wheel has a surface with a plurality of projecting bodies. Regular quadrangular pyramids are arranged thereon in a matrix with outer boundaries of bottom portions of adjacent regular quadrangular pyramids contacting each other. The pyramids rise at a rising angle of at least 30°, and a length of one side of an outer boundary of the bottom portion of the pyramid is between 10 and 100 ?m.

Abstract: Provided is a light source apparatus having a phosphor layer 3 which is subjected to a light beam of a predefined wavelength emitted from a solid light source element 2 as an excitation light beam and which generates fluorescent beam by being excited by the incident excitation light beam and emits the fluorescence beam to outside, and a metal layer 4 which is joined to a predefined surface among outer surfaces of the phosphor layer 3 except an incident surface of the excitation light beam and an outgoing surface of the fluorescence beam for converting excitons excited from a section of the phosphor layer 3 close to the predefined surface into a light beam via surface plasmon polaritons. The light beam converted from the excitons via the surface plasmon polaritons is emitted out of the outgoing surface of the phosphor layer 3 together with the fluorescence beam.

Abstract: With a view to providing a light source unit which can emit light source light of high luminance and high intensity even in the small quantity of excitation light, there is provided a light source unit including an excitation light source for emitting light in a blue wavelength band, a fluorescent wheel, a light emitting device for emitting light in a red wavelength band and a light guiding optical system for guiding light emitted from the fluorescent wheel and the light emitting device to a light guiding device, wherein the fluorescent wheel is made up of a fluorescent area where a green fluorescent material layer for emitting fluorescent light in a green wavelength band is disposed and a diffuse area for converting light emitted from the excitation light source into diffuse light of which directivity is weak are disposed end to end in a circumferential direction, and wherein the green fluorescent material layer is such that a concentration of weight content of the green fluorescent material in the green flu

Abstract: A color converted light emitting apparatus is provided that has excellent light emission characteristics and can be manufactured while a viscosity suitable for a printing method is maintained. The color converted light emitting apparatus can include a light emitting element and a color conversion layer containing a phosphor that is excited by light emitted from the light emitting element and which emits fluorescent light. The color conversion layer can further contain, as first and second thickeners, two types of particles with different average primary particle diameters. The average primary particle diameter of the second thickener can be less than one half of the average primary particle diameter of the first thickener. By appropriately adjusting the average primary particle diameters and the amounts of the thickeners added, the light emission characteristics and the emission chromaticity can be improved.

Abstract: The disclosed subject matter includes reliable semiconductor light-emitting devices having a favorable light distribution using an LED chip, which can emit light having a different color as compared to that emitted directly by the LED chip. The semiconductor light-emitting device can include an LED chip having an electrode, a phosphor layer located on the LED chip except for the electrode, a bonding wire connected to the electrode, and a light-reflecting resin. The light-reflecting resin can be disposed on a light-emitting surface that is exposed around the electrode and on the electrode including the bonding wire, and can prevent the LED chip from exhibiting a leak of light that is not wavelength-converted via the phosphor layer, while increasing light that passes through the phosphor layer. In addition, the light-reflecting resin can protect the bonding wire from vibration, etc.

Abstract: A light emitting apparatus with a combination of a plurality of LED chips and a phosphor layer is provided and can be configured to significantly reduce variations in chromaticity and luminance. The plurality of semiconductor light emitting devices (LED chips) are disposed with a gap therebetween, and the phosphor layer is formed on the upper surface thereof to bridge over the gaps between the LED chips. The phosphor layer may be uniform in thickness, but can be less in thickness over the gaps between the LED chips than on the upper surface of the LED chips. The phosphor layer can be continuously formed on the upper surface of the array of the chips with no phosphor layer present in between the chips. This configuration allows for reducing variations in luminance and chromaticity which may result from the gaps or the phosphor layer present in between the gaps.

Abstract: A light emitting diode device can include a pair of opposed electrodes and a thin film multilayer structure interposed between the pair of electrodes. The device can include one or more light emitting layers each having an emission interface. In the device, there can be adjacent layers having an interfacial plane therebetween. The interfacial plane being disposed in a position where an optical path length from the emission interface to the interfacial plane is substantially equal to, or less than, the coherent length of light emitted from the emission interface. Furthermore, the difference in refractive index between the adjacent layers is substantially equal to, or less than, 0.6. This can eliminate an interference effect within the thin film multilayer structure, thereby enhancing light emitting efficiency and achieving intended light color.