Abstract: A wavelength conversion element according to an embodiment of the present disclosure includes: a phosphor layer; a refrigerant; a refrigerant transport member; and a housing. The phosphor layer includes a plurality of phosphor particles. The phosphor layer has a gap therein. The refrigerant cools the phosphor layer. The refrigerant transport member is provided in contact with the phosphor layer. The refrigerant transport member circulates the refrigerant. The phosphor layer, the refrigerant, and the refrigerant transport member are encapsulated in the housing.

Abstract: A light-emitting device of an embodiment of the present disclosure includes: a support member having one surface; a light-emitting element provided on the one surface of the support member; a wavelength conversion section disposed in parallel with the light-emitting element on the one surface of the support member; and a light reflective member that is disposed to be opposed to the light-emitting element with the wavelength conversion section interposed therebetween, and forms a light reflective surface inclined relative to the one surface of the support member.

Abstract: A light source apparatus (1) according to the present disclosure includes a wavelength conversion device (10) that includes two or more wavelength conversion units (11-13) serially coupled in a first direction. The wavelength conversion device (10) has a configuration in which the two or more wavelength conversion units (11-13) generate respective converted lights having wavelengths different from each other to generate two or more converted lights. The two or more wavelength conversion units (11-13) each include a first end surface and a second end surface that are formed in a direction parallel to the first direction, and a light entering surface (43) that is formed in a second direction different from the first direction and which an excitation light for generating the converted light enters.

Abstract: A wavelength conversion element according to an embodiment of the present disclosure includes: a phosphor layer including a plurality of phosphor particles; a refrigerant that cools the phosphor layer; a storage section that stores the phosphor layer and the refrigerant; and a light-transmissive section that seals the storage section in combination with the storage section, and controls an output direction of output light outputted from the phosphor layer.

Abstract: A wavelength conversion device according to one embodiment of the present disclosure includes: a phosphor layer including a plurality of phosphor particles; a refrigerant that cools the phosphor layer; a circulation path that contains the phosphor layer and the refrigerant, and in which the refrigerant circulates; and a waveguide separated from the circulation path, and through which excitation light that excites the phosphor layer and a fluorescence excited by the excitation light and outputted from the phosphor layer propagate.

Abstract: An object is to provide a light-emitting element capable of further suppressing the spread of a light-emitting region and further improving directivity. A light-emitting element is provided which includes at least a phosphor layer and an emission angle selection layer which emits light incident at a predetermined angle, in which the phosphor layer includes a phosphor and a light scatterer, and the phosphor layer and the light emission angle selection layer are arranged in this order.

Abstract: A light source unit according to an embodiment of the present disclosure includes: a light source section; and a wavelength conversion element that is excited by exciting light from the light source section to emit fluorescent light. The wavelength conversion element includes a substrate that is rotatable around a rotation axis, a phosphor layer including a plurality of phosphor particles, and a quantum-dot layer including a plurality of quantum dots. The phosphor layer and the quantum-dot layer are disposed in this order relative to the light source section.

Abstract: A light source device according to an embodiment of the present disclosure includes: a light source section including a first light source outputting light in a first wavelength range and a second light source outputting light in a second wavelength range in a same direction as the light in the first wavelength range; a wavelength converter that is excited by the light in the first wavelength range to output fluorescent light; a light condenser that concentrates the light in the first wavelength range and the light in the second wavelength range on the wavelength converter; and a multiplexer that transmits light in the first wavelength range and that reflects at least a portion of the light in the second wavelength range in accordance with incident angles of the light, and combines the light in the first wavelength range, the light in the second wavelength range, and the fluorescent light.

Abstract: A wavelength conversion element according to an embodiment of the present disclosure includes: a phosphor layer; a refrigerant; a refrigerant transport member; and a housing. The phosphor layer includes a plurality of phosphor particles. The phosphor layer has a gap therein. The refrigerant cools the phosphor layer. The refrigerant transport member is provided in contact with the phosphor layer. The refrigerant transport member circulates the refrigerant. The phosphor layer, the refrigerant, and the refrigerant transport member are encapsulated in the housing.

Abstract: An illumination unit of the present disclosure includes an excitation light source, a phosphor section, an excitation-light intensity distribution generation section, and an illumination optical system. The excitation light source emits excitation light. The phosphor section includes a fluorescent light-emission surface that performs fluorescent light emission in response to receiving of the excitation light. The excitation-light intensity distribution generation section is provided between the excitation light source and the phosphor section, and varies an intensity distribution of the excitation light to bring the intensity distribution of the excitation light closer to a desired excitation-light intensity distribution on the fluorescent light-emission surface. The illumination optical system generates, on the basis of light derived from the fluorescent light emission from the phosphor section, illumination light with which an image display device is to be irradiated.

Abstract: A light source apparatus (1) according to the present disclosure includes a wavelength conversion device (10) that includes two or more wavelength conversion units (11-13) serially coupled in a first direction. The wavelength conversion device (10) has a configuration in which the two or more wavelength conversion units (11-13) generate respective converted lights having wavelengths different from each other to generate two or more converted lights. The two or more wavelength conversion units (11-13) each include a first end surface and a second end surface that are formed in a direction parallel to the first direction, and a light entering surface (43) that is formed in a second direction different from the first direction and which an excitation light for generating the converted light enters.

Abstract: A wavelength conversion device according to an embodiment of the present disclosure includes a first base member, a second base member opposed to the first base member, and a phosphor layer with which a first space is filled. The second base member has a surface opposed to the first base member. The surface has an annular recessed portion. The recessed portion includes therein a plurality of protruding portions extending from an inner peripheral portion toward an outer peripheral portion. The first space is formed by the first base member and the recessed portion of the second base member.

Abstract: An object is to provide a light-emitting element capable of further suppressing the spread of a light-emitting region and further improving directivity. A light-emitting element is provided which includes at least a phosphor layer and an emission angle selection layer which emits light incident at a predetermined angle, in which the phosphor layer includes a phosphor and a light scatterer, and the phosphor layer and the light emission angle selection layer are arranged in this order.

Abstract: A light source apparatus according to an embodiment of the present disclosure includes: a rotator including a light emission unit on one surface, a heat dissipation member that is coupled to the rotator, and has a first cylindrical surface substantially parallel to a rotation axis of the rotator, and a housing that contains the rotator and the heat dissipation member, and has a second cylindrical surface substantially parallel to the first cylindrical surface of the heat dissipation member.

Abstract: A light conversion device according to one embodiment of the disclosure includes a light conversion section that is rotatable about an axis of rotation, a cooling section that cools the light conversion section, a housing that houses the light conversion section and the cooling section, and a partition member that is provided on the light conversion section, and partitions a space in the housing.

Abstract: A light source unit includes a substrate that is rotatable, a phosphor layer disposed at a center of the substrate, a light source that irradiates the phosphor layer with exciting light, and a support section that supports a portion, of the substrate, except for the center of the substrate. This makes it difficult for heat generated in the phosphor layer to travel to a motor through the substrate.

Abstract: An illumination unit of the present disclosure includes an excitation light source, a phosphor section, an excitation-light intensity distribution generation section, and an illumination optical system. The excitation light source emits excitation light. The phosphor section includes a fluorescent light-emission surface that performs fluorescent light emission in response to receiving of the excitation light. The excitation-light intensity distribution generation section is provided between the excitation light source and the phosphor section, and varies an intensity distribution of the excitation light to bring the intensity distribution of the excitation light closer to a desired excitation-light intensity distribution on the fluorescent light-emission surface. The illumination optical system generates, on the basis of light derived from the fluorescent light emission from the phosphor section, illumination light with which an image display device is to be irradiated.

Abstract: A light source device according to an embodiment of the present disclosure includes: a light source section including a first light source outputting light in a first wavelength range and a second light source outputting light in a second wavelength range in a same direction as the light in the first wavelength range; a wavelength converter that is excited by the light in the first wavelength range to output fluorescent light; a light condenser that concentrates the light in the first wavelength range and the light in the second wavelength range on the wavelength converter; and a multiplexer that transmits light in the first wavelength range and that reflects at least a portion of the light in the second wavelength range in accordance with incident angles of the light, and combines the light in the first wavelength range, the light in the second wavelength range, and the fluorescent light.

Abstract: The invention aims to provide small-sized and highly-reliable light converter and light source unit, as well as a projector each of which makes it possible to cool down heat generated in a fluorescent body in a motorless manner. A light converter of the disclosure includes a fluorescent body that is excited by excitation light; a first light-collecting lens that has a lens surface to which the fluorescent body is bonded, and causes the excitation light to enter the fluorescent body; and a heat-dissipating member to which the lens surface is adhered at least around a region to which the fluorescent body is bonded.

Abstract: A display device includes a first substrate, a second substrate, and a plurality of light emitting sections. The first substrate includes a first surface and a second surface which faces the first surface. The second substrate is arranged to face the first substrate, and is configured with a first surface which faces the second surface of the first substrate, and a second surface which faces the first surface. The plurality of light emitting sections is provided on the second surface of the first substrate while being separated from the second substrate. A light transmission suppression layer on which a light transmission section to transmit light from light emitting sections is provided is formed on the second surface of the second substrate in correspondence to each light emitting section. An anti-reflection layer is formed in the light transmission section.