A light emitting device includes a light emitting element having a peak emission wavelength of 410 nm to 440 nm and a phosphor member. The phosphor member includes a first phosphor having a peak emission wavelength of 430 nm to 500 nm and containing an alkaline-earth phosphate, a second phosphor having a peak emission wavelength of 440 nm to 550 nm and containing at least one of an alkaline-earth aluminate and a silicate containing Ca, Mg, and Cl, a third phosphor having a peak emission wavelength of 500 nm to 600 nm and containing a rare-earth aluminate, a fourth phosphor having a peak emission wavelength of 610 nm to 650 nm and containing a silicon nitride containing Al and at least one of Sr and Ca, and a fifth phosphor having a peak emission wavelength of 650 nm to 670 nm and containing a fluorogermanate.

A white light emitting device, a light bar and a light apparatus. A relative spectrum of the white light emitting device is (). A relative spectrum of a black body radiation with a corresponding color temperature is S(). An area normalization is performed on () and S() to convert an equal energy spectrum () of the white light emitting device and an equal energy spectrum S() of the black body radiation with the corresponding color temperature. A degree of similarity R of the equal energy spectrum of the white light emitting device and the equal energy spectrum of the black body radiation satisfies the following formula: $R=1-\frac{{}_i^n.Math.S^{}\left(\right)-{}^{}\left(\right).Math.}{{}_i^n{S}^{}\left(\right)},$
when i is 380 nm, n is 680 nm, R85%.

A hand held light having a light assembly is disclosed having a substrate carrying a light emitting element. A phosphor layer is disposed atop the substrate and light emitting element. A photoluminescent layer is disposed atop the phosphor layer.

Provided is a wavelength conversion member in which the following are dispersed in a thermoplastic resin: a LuYAG fluorescent material that is represented by (Y.sub.1--Lu.sub.Ce.sub.).sub.3Al.sub.5O.sub.12 (in which is a positive number between 0.3-0.8 inclusive and is a positive number between 0.01-0.05 inclusive), that emits yellow-green light as a result of excitation by blue light, and that has a diffraction peak within a range in which the diffraction angle 2 in X-ray diffraction by the K.sub.1 line of Cu is 52.9 to 53.2 inclusive; and a KSF fluorescent material that is represented by K.sub.2(Si.sub.1-xMn.sub.x)F.sub.6 (in which x is a positive number between 0.001 and 0.3 inclusive) and that emits red light as a result of excitation by blue light. The content of the KSF fluorescent material in the wavelength conversion member is 1 to 5 times the content of the LuYAG fluorescent material by mass ratio. The wavelength conversion member makes it possible to provide a light-emitting device that has small color deviation, that is suitable as a lighting device, that emits white light, and that has good color rendering properties in a color temperature range of 4,000-6,500K, i.e., the color temperature range from white to daylight color.

Provided are a light emitting device capable of reducing glare, a headlight, and a vehicle including the same.

The light emitting device comprises: a light emitting element having a light emission peak wavelength in a range of 400 nm or more and 490 nm or less; and a wavelength conversion member including a first fluorescent material having a light emission peak wavelength in a range of 480 nm or more and less than 580 nm and a second fluorescent material having a light emission peak wavelength in a range of 580 nm or more and 680 nm or less and having a composition different from that of the first fluorescent material, wherein the light emitting device emits light having a first luminance ratio Ls/L that is 0.9 or less, where Ls/L is a ratio of a first effective radiance Ls of the light emitted by the light emitting device in consideration of a spectral luminous efficiency curve for photopic vision of humans specified by the CIE (Commission Internationale de l'Eclairage) and S-cone spectral sensitivity of humans, to a luminance L of the light emitted by the light emitting device in consideration of the spectral luminous efficiency curve for photopic vision of humans.

Disclosed is a blue to white light conversion device, comprising: a light conversion subassembly comprising at least one light conversion layer, sandwiched between two light transmitting members, wherein the light conversion layer comprises a light conversion material comprising phosphors and/or quantum dots; at least one light diffusing subassembly neighboring the light conversion subassembly; and a top frame and a bottom frame surrounding the light diffusing subassembly and light conversion subassembly, respectively.

A light emitting device includes a light emitting element having a peak emission wavelength of 410 nm to 440 nm and a phosphor member. The phosphor member includes a first phosphor having a peak emission wavelength of 430 nm to 500 nm and containing an alkaline-earth phosphate, a second phosphor having a peak emission wavelength of 440 nm to 550 nm and containing at least one of an alkaline-earth aluminate and a silicate containing Ca, Mg, and Cl, a third phosphor having a peak emission wavelength of 500 nm to 600 nm and containing a rare-earth aluminate, a fourth phosphor having a peak emission wavelength of 610 nm to 650 nm and containing a silicon nitride containing Al and at least one of Sr and Ca, and a fifth phosphor having a peak emission wavelength of 650 nm to 670 nm and containing a fluorogermanate.

A light emitting device includes a light emitting element having a peak emission wavelength of 410 nm to 440 nm and a phosphor member. The phosphor member includes a first phosphor having a peak emission wavelength of 430 nm to 500 nm and containing an alkaline-earth phosphate, a second phosphor having a peak emission wavelength of 440 nm to 550 nm and containing at least one of an alkaline-earth aluminate and a silicate containing Ca, Mg, and Cl, a third phosphor having a peak emission wavelength of 500 nm to 600 nm and containing a rare-earth aluminate, a fourth phosphor having a peak emission wavelength of 610 nm to 650 nm and containing a silicon nitride containing Al and at least one of Sr and Ca, and a fifth phosphor having a peak emission wavelength of 650 nm to 670 nm and containing a fluorogermanate.

The various embodiments of the present invention relate to condensation curable silicone compositions comprising: a condensation curable polyorganosiloxane; and treated particles comprising a particulate solid having an effective amount of nitrogen-containing base (e.g., a nitrogen-containing superbase) disposed thereon. Other embodiments of the present invention relate to methods for preparing the aforementioned treated particles; the treated particles themselves; and methods of using the treated particles and compositions of the various embodiments of the present invention.

One aspect of this disclosure is a photoluminescent apparatus comprising a body made from a glow medium comprising a photoluminescent material and a biocompatible silicone, the photoluminescent material being hosted in and rechargeable through the biocompatible silicone, a total mass of the body comprising a concentration of the photoluminescent material greater than 20% and less than 50%. Related apparatus, kits, methods, and systems also are described.