The invention relates to a luminophore mixture which comprises at least one quantum dot luminophore and at least one functional material, the functional material is formed such that it scatters electromagnetic radiation and/or has a high density.

Provided are a light-emitting instrument, and an image display device utilizing an AlON phosphor and having wide color gamut. The light-emitting instrument includes an emission source emitting light having a wavelength from 410 nm to 470 nm and a phosphor or a light-transmitting body where the phosphor is dispersed, and the phosphor includes an inorganic compound where an AlON crystal, an AlON solid solution crystal, or an inorganic crystal having a crystal structure identical to AlON includes at least Mn, an A element (a monovalent metal element) it necessary, a D element (a divalent metal element) if necessary, an E element (a monovalent anion) if necessary, and a G element (one or more elements other than Mn, the A, Al, O, N, the D, or the E) if necessary, and emits fluorescence having a peak wavelength from 515 nm to 541 nm upon irradiation of an excitation source.

A wavelength converter includes: a plurality of phosphor particles; and a binder layer that adheres the plurality of adjacent phosphor particles to one another, the binder layer being composed of a nanoparticle-adhered body in which a plurality of nanoparticles having an average particle size D.sub.50 of 1 nm or more and less than 100 nm are adhered to one another.

The present invention relates to a composition comprising at least one phosphor.

A light emitting device includes: a solid-state light emitting element that emits excitation light having a maximum intensity value within a wavelength range of 440 nm or more and less than 470 nm; and a wavelength conversion member composed by combining a first wavelength converter, which includes a first phosphor activated by Ce.sup.3+, and a second wavelength converter, which includes a second phosphor activated by Ce.sup.3+, with each other. The first phosphor emits first fluorescence having a maximum intensity value within a wavelength range of 470 nm or more and less than 530 nm, and the second phosphor emits second fluorescence having a maximum intensity value within a wavelength range of 580 nm or more and less than 660 nm. The first wavelength converter has a dispersed state in which particles of the first phosphor are not in contact with one another.

An europium activating -type sialon phosphor contains at least one kind of element selected from the group made of yttrium, titanium, and gadolinium, wherein the total content of the at least one kind of element is more than 0 ppm and less than 1000 ppm.

Disclosed is a method for manufacturing crystals of aluminates of one or more element(s) other than aluminium, referred to as A. The method includes: placing starting reagents, including at least one aluminium element source and a source of the element(s) A that has a degree of oxidation of between 1 and 6, in suspension in a liquid medium, forming a suspension referred to as the starting suspension; milling the starting suspension at 50 C., in a three-dimensional liquid medium ball mill for 5 minutes; recovering, at the outlet of the three-dimensional ball mill, a suspension referred to as the end suspension including the starting reagents in activated form or crystals of aluminate of the element(s) A generally in hydrated form; if required, calcination of the end suspension when it includes the starting reagents in activated form, to obtain generally non-hydrated crystals of aluminate of the element(s) A.

A phosphor includes, as a main component, a compound represented by a general formula (3-a)YO.sub.3/2.aCeO.sub.3/2.(5-b)AlO.sub.3/2.bGaO.sub.3/2.cKO.sub.1/2.dPO.sub.5/2, where a, b, c and d satisfy 0.12a0.18, 1.50b3.00, 0.01c0.08, and 0.01d0.08.

A light-emitting device includes a light-emitting element that emits blue light, a Mn.sup.2+-activated -AlON green phosphor, and a dispersing material in which the green phosphor is dispersed. The green phosphor has an in-crystal Mn concentration of 2.5 wt % or more. The shortest path of the blue light through the dispersing material is 1 mm long or shorter.

A lighting apparatus includes light emitting elements having an emission peak wavelength of 400 to 510 nm, a first phosphor having an emission peak wavelength of 485 to 700 nm, a second phosphor having an emission peak wavelength of 510 to 590 nm, a third phosphor having an emission peak wavelength of 600 to 700 nm, and a color filter having transmittance for light with a wavelength of 600 to 730 nm that is 80% or more and transmittance for light with a wavelength of 410 to 480 nm that is 3% or more and 50% or less. The color filter transmits a part of light emitted from the first phosphor, at least a part of light emitted from the second phosphor, and at least a part of light emitted from the third phosphor. Light transmitted through the color filter is emitted to the outside.