A photosensitive composition, a quantum dot polymer composite pattern prepared therefrom, and a layered structure and an electronic device including the same. The photosensitive composition includes plurality of quantum dots; a luminescent material other than a quantum dot; a carboxylic acid group containing binder; a photopolymerizable monomer having a carbon-carbon double bond; and a photoinitiator, and the luminescent material comprises a fluorophore, a nanosized inorganic phosphor, or a combination thereof.

Provided is a wavelength conversion member that can be produced at low cost and can suppress temporal variation in the chromaticity of light when used in a light source device. The wavelength conversion member contains: a phosphor that performs wavelength conversion of at least a portion of incident light and releases emitted light of a different wavelength to the incident light; a light diffusing element that diffuses either or both of the incident light and the emitted light; and a base material that holds the light diffusing element. The light diffusing element is a silicone resin, and the base material includes a hydrogenated styrene copolymer.

A method for manufacturing green-emitting phosphor particles including the steps of producing a powder containing europium and strontium from a solution containing a europium compound and a strontium compound, mixing the resulting powder and a powdered gallium compound, and performing firing.

In one aspect, the disclosure relates to compositions comprising a surface-modified phosphor material comprising a phosphor material and a silane, methods of making same, and articles comprising same. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.

The invention provides a lighting device configured to provide red lighting device light, the lighting device comprising: (i) a first light source configured to provide first light source light having a peak wavelength (ls); (ii) a first red luminescent material configured to absorb at least part of the first light source light and to convert into first red luminescent material light having a first red emission peak wavelength (m1), the first red luminescent material having an excitation maximum (x1); (iii) a second red luminescent material configured to absorb at least part of the first light source light and to convert into second red luminescent material light having a second red emission peak wavelength (m2), the second red luminescent material having a second excitation maximum (x2); and wherein the first luminescent material and the second luminescent material are Eu2+ based, and wherein m1<m2, x1<ls and x2>ls.

Provided are a method of producing a thiogallate-based fluorescent material, a method of producing a light-emitting device, a thiogallate-based fluorescent material, and a light-emitting device. The method of producing a thiogallate-based fluorescent material includes preparing a first solution containing at least one M1 ion selected from the group consisting of Sr, Be, Mg, Ca, Ba and Zn, and at least one M2 ion selected from the group consisting of Eu and Ce, and a second solution containing a sulfite ion, simultaneously supplying the first solution and the second solution to a reactor to obtain a powder containing a sulfite that contains an element M1 and an element M2, mixing a raw material that contains the powder containing the sulfite that contains the element M1 and the element M2 and a powder containing a gallium compound, with lithium chloride to obtain a mixture, and heat-treating the mixture to obtain a thiogallate-based fluorescent material.

The invention provides a lighting device (1) comprising (a) a light source (10) configured to generate light source light (11), and (b) a light converter (100) configured to convert at least part of the light source light (11) into visible converter light (111), wherein the light converter (100) comprises a matrix (120) containing an organic luminescent material (140) of the benzoxanthene derivative type. The lighting device may further comprise a further luminescent material (130).

A lighting apparatus for emitting white light including a semiconductor light source emitting radiation with a peak emission between from about 250 nm to about 500 nm and a first phosphor having a peak emission between about 550 and 615 nm, wherein an overall emission spectrum of the lighting apparatus has a depression between about 550 and 615 nm, whereby the red-green color contrast is increased versus a reference illuminant.

A semiconductor light emitting device includes an LED and an associated recipient luminophoric medium that includes respective first through fourth luminescent materials that down-convert respective first through fourth portions of the radiation emitted by the LED to radiation having respective first through fourth peak wavelengths. The first peak wavelength is in the green color range and the second through fourth peak wavelengths are in the red color range. The second and third luminescent materials each emit light having a full-width half maximum bandwidth of at least 70 nanometers, while the fourth luminescent material emits light having a full-width half maximum bandwidth of less than 60 nanometers. Embodiments that only include three luminescent materials are also disclosed.

The present invention relates to a photochromic toy containing a light irradiator equipped with a light source and a toy main body containing a photochromic compound, in which the light source has a peak wavelength in the range of from 400 nm to 495 nm and the photochromic compound satisfies the following expression (1) between the integrated value of absorbance (x) in the range of from a wavelength showing a maximum absorbance in less than 400 nm to a wavelength of 400 nm and the integrated value of absorbance (y) in the wavelength range of from 400 nm to 700 nm.
y/x0.02(1)