Denka Company Limited

National Institute for Materials Science

Hiroaki Toyoshima

Ryo Yoshimatsu

Hiroki Banno

Naoto Hirosaki

Hideyuki Emoto

Taiyo Yamaura

Masato Akabane

Mitsuru Kawagoe

A phosphor in which at least some of an element M in a phosphor host crystal represented by M(L, A)Xis 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 Iand a fluorescence intensity at a wavelength of 617 nm is represented by I, I/Iis 0.01 or more and 0.4 or less.

Phosphor, method of producing phosphor, light-emitting element, light-emitting device, and image display apparatus

A phosphor powder of the present invention is a phosphor powder which contains an inorganic compound in which Eu as an activator is solid-soluted in a crystal represented by BaSiONor in an inorganic crystal having the same crystal structure as the crystal represented by BaSiON, and which is constituted such that in an emission spectrum obtained by irradiating the phosphor powder with excitation light having a wavelength of 450 nm, when a luminescence intensity at a peak wavelength in a range of equal to or more than 750 nm and equal to or less than 950 nm is P0, and when a luminescence intensity at a peak wavelength in a range of equal to or more than 520 nm and equal to or less than 600 nm is P1, 0.01≤P1/P0≤0.12 is satisfied by P0 and P1.

Phosphor powder and light emitting device

A method for manufacturing a phosphor powder of the present invention, in which the phosphor powder contains an inorganic compound in which Eu as an activator is solid-soluted in a crystal represented by BaSiONor in an inorganic crystal having the same crystal structure as the crystal represented by BaSiON, the method including: a mixing step of mixing a raw material containing each element constituting the inorganic compound to obtain a raw material mixture blended such that b=51 and a/b>(26−c)/51 are satisfied when molar ratios of Ba, Si, and Eu in the raw material mixture are respectively a, b, and c; a firing step of firing the raw material mixture to obtain a fired product; and a cleaning treatment step of subjecting the fired product to an acid treatment and/or a water treatment.

Method for manufacturing phosphor powder, phosphor powder, and light emitting device

A phosphor in which an element represented by Ris solid-solutionized in a phosphor host crystal represented by M(L, A)X, wherein M is at least one type of element selected from Mg, Ca, Sr, Ba and Zn, L is at least one type of element selected from Li, Na and K, A is at least one type of element selected from Al, Ga, B, In, Sc, Y, La and Si, X is at least one type of element selected from O, N, F and Cl (where all of X being N is excluded), R is at least one type of element selected from Mn, Cr, Ti, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho and Yb, &#x3b1;, &#x3b2;, &#x3b3; and &#x3b4; satisfy &#x3b1;+&#x3b2;+&#x3b3;+&#x3b4;=9, 0.00&#x3c;&#x3b1;&#x2264;1.30, 3.70&#x2264;&#x3b2;&#x2264;4.30, 3.70&#x2264;&#x3b3;&#x2264;4.30, and 0.00&#x3c;&#x3b4;&#x2264;1.30.

Phosphor and light-emitting device using same

The present invention relates to a complex oxynitride phosphor which is efficiently excited in the UV to near-UV wavelength region and emits green to yellow light, and a light emitting device using the phosphor. The phosphor according to the present invention is characterized in that it is represented by general formula: M1M2ReSiON; wherein M1 is one or more elements selected from Y, Sc, La, and Al; M2 is one or more elements selected from Zn, Sr, Ba, Ca, and Mg; Re is one or more elements selected from Ce, Pr, Sm, Eu, Dy, Ho, Er, Tm, Yb, Ti, Cr, and Mn among rare-earth elements and transition metal elements; and a, b, c, d, e, and fin the formula satisfy the relationships:=1,0.20&#x3c;&#x3c;0.50,0.001&#x3c;&#x3c;0.10,2.5&#x3c;&#x3c;4.1,0.5&#x3c;&#x3c;1.0, and3.5&#x3c;&#x3c;5.6.

Phosphor and light emitting device

Provided are: a phosphor that has a crystal structure identical to a CaAlSiNcrystal phase, which absorbs light of a light emitting element such as an LED and emits red light, as a host crystal and exhibits luminous efficiency more excellent than those of conventional phosphors; and a light emitting device which has high luminance and long service life by the use of this phosphor. A powder phosphor, which is represented by general formula Ca(Si,Al)(N,O)(wherein 0.75&#x2266;x&#x2266;0.92 and &#x2212;0.2&#x2266;y&#x2266;0.2), and wherein some of Ca element is substituted by Eu element. This powder phosphor has an Si/Al ratio (molar ratio) of from 0.9 to 1.55 (inclusive), an Eu content of from 0.01 at % to 0.3 at % (inclusive), and an amount of intragranular solid-solved oxygen of from 0.4% by mass to 0.7% by mass (inclusive).

Growing community of inventors

Tokyo, Japan

Hiroaki Toyoshima