Nichia Corporation

Shigeki Yoshida

Hiroyuki Watanabe

Shoji Hosokawa

Eri Matsuka

Sadakazu Wakui

Hirofumi Ooguri

Tadayoshi Yanagihara

Takayuki Shinohara

Tomoya Fukui

A wavelength conversion member includes a support and a wavelength conversion layer including a first phosphor having a composition represented by Formula (1) and having an emission peak wavelength in a range from 550 nm to 620 nm, and a second phosphor having a different emission peak wavelength and/or a full width at half maximum from the first phosphor. An amount of the first phosphor in the wavelength conversion layer is in a range from 20 mass % to 80 mass % relative to a total amount of the phosphors In Formula (1), Mrepresents at least one of rare earth elements other than La and Ce, a total molar content percentage of Y, Gd, and Lu in Mis 90% or more, and p, q, r, and s satisfy 2.7≤(p+q+r)≤3.3, 0≤r≤1.2, 10≤s≤12, and 0<q≤1.2.LaCeMSiN  (1)

Wavelength conversion member and light emitting device

Provided is a fluorescent material with high brightness. The fluorescent material includes a nitride fluorescent material comprising La, Ce, Si, and N; and a first phosphorus compound disposed on a surface of the nitride fluorescent material. The first phosphorus compound includes at least one selected from the group consisting of lanthanum phosphate, lanthanum hydrogen phosphate, and hydrates thereof. A content of phosphorus atoms in the fluorescent material is 0.07% by mass or higher and 0.8% by mass or lower.

Fluorescent material and method for producing same

The wavelength converter includes a support, and a wavelength conversion layer disposed on the support. The wavelength conversion layer contains a fluorescent layer containing a fluorescent material with a composition represented by formula (1) below, and having a thickness of from 5 &#x3bc;m to 155 &#x3bc;m. A ratio of a sum of cross-sectional areas of particles of the fluorescent material in a cross-section of the wavelength conversion layer orthogonal to a disposed surface of the wavelength conversion layer that is disposed on the support and including a full width of the wavelength conversion layer to a cross-sectional area of the cross-section of the wavelength conversion layer is from 5% to 40%. In the formula (1), Mis at least one selected from the rare earth elements other than La and Ce; a total amount of yttrium (Y), gadolinium (Gd), and lutetium (Lu) by mole with respect to a total amount of Mby mole is 90% or more; and p, q, r, and s satisfy 2.7&#x2264;p+q+r&#x2264;3.3, 0&#x2264;r&#x2264;1.2, 10&#x2264;s&#x2264;12, and 0&#x3c;q&#x2264;1.2.LaCeMSiN&#x2003;&#x2003;(1)

Wavelength converter and light emitting device

Provided are a method for producing a ceramic composite material that has a high light emission intensity, a ceramic composite material, and a light emitting device. The method for producing a ceramic composite material, includes: preparing a green body containing a nitride fluorescent material having a composition represented by the following chemical formula (I) and aluminum oxide particles mixed with each other; and performing primary sintering the green body at a temperature in a range of 1,250&#xb0; C. or more and 1,600&#xb0; C. or less to provide a first sintered body:MLnAN&#x2003;&#x2003;(I)wherein in the chemical formula (I), M represents at least one element selected from the group consisting of Ce and Pr; Lnrepresents at least one element selected from the group consisting of Sc, Y, La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; A represents at least one element selected from the group consisting of Si and B; and w, x, y, and z each satisfy 0&#x3c;w&#x2264;1.0, 2.5&#x2264;x&#x2264;3.5, 5.5&#x2264;y&#x2264;6.5, and 10&#x2264;z&#x2264;12.

Method for producing ceramic composite material, ceramic composite material, and light emitting device

Provided are an oxynitride fluorescent material, a light emitting device, and a method for producing an oxynitride fluorescent material. The oxynitride fluorescent material containing a composition represented by the following formula (I): (BaEu)MSiON(I), wherein in the formula (I), M represents at least one element selected from the group consisting of rare earth elements excluding Eu and Sm; and a, b, c, and d each satisfy 0&#x3c;a&#x2264;1.0, 0&#x3c;b&#x2264;0.07, &#x2212;0.3&#x3c;c&#x3c;0.3, and &#x2212;0.3&#x3c;d&#x3c;0.3.

Oxynitride fluorescent material, light emitting device, and method for producing oxynitride fluorescent material

Provided is a production method of a nitride fluorescent material capable of producing a nitride fluorescent material having a higher emission intensity. The production method is for producing a nitride fluorescent material having a composition containing at least one element Mselected from the group consisting of Sr, Ca, Ba and Mg, at least one element Mselected from the group consisting of Li, Na and K, at least one element Mselected from the group consisting of Eu, Ce, Tb and Mn, and Al and N, which includes subjecting a raw material mixture containing elements constituting the composition of the nitride fluorescent material, along with SrFand/or LiF added thereto as a flux, to a heat treatment, wherein the amount of the flux is in a range of 5.0% by mass or more and 15% by mass or less relative to the total amount, 100% by mass of the raw material mixture and the flux.

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Anan, Japan

Shigeki Yoshida