Ushio Denki Kabushiki Kaisha

Seiji Kitamura

Masaki Inoue

Kiyoyuki Kabuki

Disclosed is a fluorescent plate in which a high reflectance of a reflective layer can be maintained over a long period of time, and occurrence of peeling of the reflective layer can be suppressed. The fluorescent plate of the present invention includes a fluorescent material layer containing a fluorescent material, an oxide layer disposed below the fluorescent material layer, and a reflective layer which is disposed below the oxide layer and is formed of silver, and further includes an oxidation-preventive protective layer which is disposed between the oxide layer and the reflective layer and is formed of a translucent material, and a translucent adhesion layer interposed between the oxidation-preventive protective layer and the reflective layer.

Fluorescent plate

Provided are a light emitting element capable of maintaining high fluorescent intensity over a long period, and a fluorescent light source device. The light emitting element according to the present invention includes: a substrate; a reflection layer formed of a material containing Ag or Al, formed on the upper layer of the substrate; a diffusion prevention layer formed of a layer at least part of which being crystallized, the diffusion prevention layer being formed in contact with a surface of the reflection layer on a side opposite to the substrate; an enhanced reflection layer formed in contact with a surface of the diffusion prevention layer on a side opposite to the substrate; and a fluorescent body layer formed on the upper layer of the enhanced reflection layer.

Light emitting element, fluorescent light source device

The present invention has as its object the provision of a fluorescence light source apparatus which provides a high emission efficiency of a fluorescent plate and a sufficiently high fluorescence intensity. According to the present invention, the fluorescence light source apparatus includes a fluorescent plate that receives excitation light to emit fluorescence, and a heat dissipation substrate that dissipates heat generated in the fluorescent plate, the fluorescent plate and the heat dissipation substrate being bonded via a solder layer, wherein the solder layer has a void ratio of not more than 75% and a maximum void diameter of not more than 0.4 mm. The solder layer may preferably have a void ratio of not more than 50% and a maximum void diameter of not more than 0.2 mm.

Fluorescence light source apparatus

A fluorescence light source device includes a wavelength conversion member that emits fluorescence by excitation laser light. The wavelength conversion member has an excitation laser light receiving surface including a periodic structure having a periodic array of conical or truncated projections with an aspect ratio, which is a ratio of the height of the projection to the pitch in the periodic structure, of not lower than 0.2. The wavelength conversion member is formed from a phosphor composed of a polycrystal and contains a micro-scatterer with a refractive index of not lower than 1.0 for scattering the excitation laser light and fluorescence emitted from the phosphor. A ratio (T/R) between a light transmission percentage T [%] in the wavelength conversion member and a light reflection percentage R [%] in the wavelength conversion member is 1 to 20.

Fluorescence light source device with wavelength conversion member with particular ratio between light transmission percentage and light reflection percentage

The present invention has as its object the provision of a fluorescence light source apparatus that is prevented from a drop in reflectance and can provide high emission efficiency over a long period of time without causing the problem of exfoliation of a reflection layer from a fluorescent plate. The fluorescence light source apparatus according to the present invention includes a fluorescent plate that is made of a phosphor for emitting fluorescence under excitation light and a metal oxide and has a front surface serving as an excitation light incident surface, a reflection layer disposed on a back surface side of the fluorescent layer, and a heat dissipation substrate. A sealing layer covering the back surface and a peripheral side surface of the reflection layer is provided in close contact with a peripheral area of the back surface of the fluorescent plate via an adhesion layer.

Reflection type fluorescence light source apparatus

The fluorescence light source device of the present invention includes a fluorescence member formed from a phosphor composed of single crystal or polycrystal and excited by excitation light. A periodic structure layer made of a high refractive index material having a refractive index of not less than the refractive index of the fluorescence member is formed on the surface of the fluorescence member. The periodic structure layer has a surface with a periodic structure having a periodic array of conical or truncated projections and formed by an etching process. The aspect ratio which is a ratio of the height of the projections to the pitch in the periodic structure is within a range of 0.5 to 0.9.

Fluorescence light source device with periodic structure having an aspect ratio of 0.5 to 0.9 and method for producing the same

A fluorescent light source device includes a wavelength conversion member formed of a phosphor to be excited by excitation light. The wavelength conversion member includes a fluorescent member containing the phosphor, and a photonic structure part formed on the fluorescent member. An upper surface of the photonic structure part serves as a fluorescent light emitting surface of the wavelength conversion member. The photonic structure part is made from an inorganic compound layer that may be formed of a metal oxide and has a columnar structure extending in a direction away from the fluorescent member.

Fluorescent light source device, and method for manufacturing same

The present invention has as its object the provision of a fluorescence light source apparatus which has high reliability without a drop in reflectance over a long period of time. The fluorescence light source apparatus of the present invention includes a fluorescent plate that emits fluorescence under excitation light and has a front surface serving as an excitation light incident surface, a reflection layer that is disposed on a back surface side of the fluorescent plate, and a heat dissipation substrate, wherein a sealing layer covering a back surface and a peripheral side surface of the reflection layer is provided in close contact with a peripheral area of the back surface of the fluorescent plate via an adhesion layer, and a diffusion prevention layer formed by nickel plating is provided on the heat dissipation substrate via a bonding member layer.

Provided is a fluorescence-emitting light source unit that includes a wavelength conversion member having a light receiving surface and a phosphor. The light receiving surface is configured to receive excitation light, and the phosphor is configured to convert the excitation light received by the light receiving surface into fluorescence and emit the fluorescence. The light receiving surface includes a cyclic structure having projections, in which the projections are cyclically arrayed and each have a substantially cone shape. An aspect ratio is about 0.2 or greater, in which the aspect ratio is a ratio of a height of any of the projections to a pitch of the array of the projections. The pitch of the array is of a size that falls within a range in which diffraction of the fluorescence emitted from the phosphor occurs.

Growing community of inventors

Tokyo, Japan

Seiji Kitamura