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.

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 core-shell quantum dot comprising zinc, a core comprising a first semiconductor nanocrystal material; and a semiconductor nanocrystal shell disposed on the core, wherein the core-shell quantum dot does not comprise cadmium, and does comprise zinc, tellurium, selenium, and aluminum.

A core-shell quantum dot comprising zinc, a core comprising a first semiconductor nanocrystal material; and a semiconductor nanocrystal shell disposed on the core, wherein the core-shell quantum dot does not comprise cadmium, and does comprise zinc, tellurium, selenium, and aluminum.

Disclosed are a method of producing an aluminate fluorescent material, such an aluminate fluorescent material, and a light emitting device. The aluminate fluorescent material production method includes: subjecting a first mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, and at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, in which a compound containing Mg may be optionally mixed, to first heat treatment to give a first calcined product having an average particle diameter D1, as measured according to a Fisher Sub-Sieve Sizer method, of 6 m or more; and subjecting a second mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, and the first calcined product whose content is 10% by mass or more and 90% by mass or less relative to the total amount of the second mixture, in which a compound containing Mg may be optionally mixed, to second heat treatment to give a second calcined product.

Disclosed are a method of producing an aluminate fluorescent material, such an aluminate fluorescent material, and a light emitting device. The aluminate fluorescent material production method includes: subjecting a first mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, and at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, in which a compound containing Mg may be optionally mixed, to first heat treatment to give a first calcined product having an average particle diameter D1, as measured according to a Fisher Sub-Sieve Sizer method, of 6 m or more; and subjecting a second mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, and the first calcined product whose content is 10% by mass or more and 90% by mass or less relative to the total amount of the second mixture, in which a compound containing Mg may be optionally mixed, to second heat treatment to give a second calcined product.

A process for preparing a Mn.sup.+4 doped phosphor of formula I ##STR00001##
includes gradually adding a first solution comprising a source of M and HF and a second solution comprising a source of Mn to a reactor, in the presence of a source of A and an anion selected from phosphate, sulfate, acetate, and combinations thereof, to form a product liquor comprising the Mn.sup.+4 doped phosphor. The process also includes gradually discharging the product liquor from the reactor while volume of the product liquor in the reactor remains constant. A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MF.sub.y] ion; and y is 5, 6 or 7.

A process for preparing a Mn.sup.+4 doped phosphor of formula I ##STR00001##
includes gradually adding a first solution comprising a source of M and HF and a second solution comprising a source of Mn to a reactor, in the presence of a source of A and an anion selected from phosphate, sulfate, acetate, and combinations thereof, to form a product liquor comprising the Mn.sup.+4 doped phosphor. The process also includes gradually discharging the product liquor from the reactor while volume of the product liquor in the reactor remains constant. A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MF.sub.y] ion; and y is 5, 6 or 7.

The present invention provides a cosmetic product capable of making the skin look youthful and producing a natural three-dimensional appearance. The present invention relates to a cosmetic product including two or more phosphors each containing an inorganic compound, wherein the cosmetic product, upon excitation by excitation light having a wavelength of 365 nm, emits an emission spectrum having a fluorescence emission peak in each of the range of 400 to 530 nm and the range of 620 to 720 nm and having an I.sub.2/I.sub.1 of 1 to 30, where I.sub.1 is a maximum emission intensity in the range of 530 to 620 nm and I.sub.2 is a maximum peak intensity in the range of 620 to 720 nm.

The present invention provides a cosmetic product capable of making the skin look youthful and producing a natural three-dimensional appearance. The present invention relates to a cosmetic product including two or more phosphors each containing an inorganic compound, wherein the cosmetic product, upon excitation by excitation light having a wavelength of 365 nm, emits an emission spectrum having a fluorescence emission peak in each of the range of 400 to 530 nm and the range of 620 to 720 nm and having an I.sub.2/I.sub.1 of 1 to 30, where I.sub.1 is a maximum emission intensity in the range of 530 to 620 nm and I.sub.2 is a maximum peak intensity in the range of 620 to 720 nm.