Provided are a scintillator and the like capable of improving emission intensity. A scintillator (S) comprises a sapphire substrate (6), a GaN layer (4) that is provided on the incident side to the sapphire substrate (6) and includes GaN, a quantum well structure (3) provided on the incident side to the GaN layer (4), and a conductive layer (2) provided on the incident side to the quantum well structure (3), wherein a plurality of emitting layers (21) including InGaN and a plurality of barrier layers (22) including GaN are alternatively stacked in the quantum well structure (3), and an oxygen-containing layer (23) including oxygen is provided between the quantum well structure (3) and the conductive layer (2).

Provided are a quantum dot material, a preparation method and use thereof. The quantum material includes a quantum dot, and a first cladding layer and a second cladding clad outside of the quantum dot, wherein the first cladding layer is located between the quantum dot and the second cladding layer. The quantum dot material provided herein has good water and oxygen barrier properties and good stability.

A polymer, a quantum dot composition, and a light-emitting device employing the same are provided. The polymer includes a first repeat unit that has a structure represented by Formula (I):

##STR00001##

wherein the definitions of R.sup.1, R.sup.2, A.sup.1, A.sup.2, A.sup.3, and Z.sup.1 and n are as defined in the specification.

A coated phosphor including: an inorganic phosphor particle; and a silicon oxide coating that coats the inorganic phosphor particle, wherein a molar ratio (O/Si) of an oxygen atom to a silicon atom in the silicon oxide coating through ICP emission spectroscopy of the coated phosphor is 2.60 or less.

A phosphor in which at least some of an element M in a phosphor host crystal represented by M.sub.α(L,A).sub.βX.sub.γ is substituted with Eu as an activation material. M represents one or more (including at least Sr) of Mg, Ca, Sr, Ba, and Zn, L represents one or more of Li, Na, and K, A represents one or more of Al, Ga, B, In, Sc, Y, La, and Si, X represents one or more (except that X represents only N) of O, N, F, and Cl, α, β, γ, and δ satisfy 8.70≤α+β+γ+δ≤9.30, 0.00<α≤1.30, 3.70≤β≤4.30, 3.70≤γ≤4.30, and 0.00<δ≤1.30. In a fluorescence spectrum obtained by irradiation with light having a wavelength of 260 nm, when a fluorescence intensity at a wavelength of 569 nm is represented by I.sub.0 and a fluorescence intensity at a wavelength of 617 nm is represented by I.sub.1, I.sub.1/I.sub.0 is 0.01 or more and 0.4 or less.

A phosphor in which at least some of an element M in a phosphor host crystal represented by M.sub.α(L,A).sub.βX.sub.γ is substituted with Eu as an activation material. M represents one or more (including at least Sr) of Mg, Ca, Sr, Ba, and Zn, L represents one or more of Li, Na, and K, A represents one or more of Al, Ga, B, In, Sc, Y, La, and Si, X represents one or more (except that X represents only N) of O, N, F, and Cl, α, β, γ, and δ satisfy 8.70≤α+β+γ+δ≤9.30, 0.00<α≤1.30, 3.70≤β≤4.30, 3.70≤γ≤4.30, and 0.00<δ≤1.30. In a fluorescence spectrum obtained by irradiation with light having a wavelength of 260 nm, when a fluorescence intensity at a wavelength of 569 nm is represented by I.sub.0 and a fluorescence intensity at a wavelength of 617 nm is represented by I.sub.1, I.sub.1/I.sub.0 is 0.01 or more and 0.4 or less.

Provided are an inorganic fluorescent nanoparticle composite that can suppress the degradation of inorganic fluorescent nanoparticles when sealed in glass and a wavelength conversion member using the inorganic fluorescent nanoparticle composite. An inorganic fluorescent nanoparticle composite 1 is made up by including: an inorganic fluorescent nanoparticle 2; and an inorganic fine particle 3 deposited on a surface of the inorganic fluorescent nanoparticle 2.

Provided are an inorganic fluorescent nanoparticle composite that can suppress the degradation of inorganic fluorescent nanoparticles when sealed in glass and a wavelength conversion member using the inorganic fluorescent nanoparticle composite. An inorganic fluorescent nanoparticle composite 1 is made up by including: an inorganic fluorescent nanoparticle 2; and an inorganic fine particle 3 deposited on a surface of the inorganic fluorescent nanoparticle 2.

Provided are a core shell particle including a core which contains a Group III element and a Group V element, and a shell which covers at least a part of a surface of the core and contains a Group II element and a Group VI element, in which a ratio of a peak intensity showing a bond between the Group III element and the Group II element to a peak intensity showing a bond between the Group III element and the Group V element, which is measured by Raman spectroscopy, is in a range of 0.16 to 0.33; a method of producing the core shell particle; and a film formed of the core shell particle.

Provided are a core shell particle including a core which contains a Group III element and a Group V element, and a shell which covers at least a part of a surface of the core and contains a Group II element and a Group VI element, in which a ratio of a peak intensity showing a bond between the Group III element and the Group II element to a peak intensity showing a bond between the Group III element and the Group V element, which is measured by Raman spectroscopy, is in a range of 0.16 to 0.33; a method of producing the core shell particle; and a film formed of the core shell particle.