Denka Company Limited

Marina Takamura

Yusuke Takeda

Shintaro Watanabe

Tomohiro Nomiyama

Masaru Miyazaki

Tatsuya Okuzono

A red phosphor represented by general formula: MSiAlN, wherein M is at least one or more elements selected from Mg, Ca, Sr and Ba, and is partially replaced with Eu and has, as a host crystal, a crystal structure identical to that of a CaAlSiNcrystal phase, and the phosphor has a bulk density of 0.70 g/cmor more and 2.30 g/cmor less. There is also provided a light-emitting element including the red phosphor and a semiconductor light-emitting element capable of exciting the red phosphor.

Red fluorescent body and light-emitting device

A phosphor having a main crystal phase having a crystal structure identical to that of CaAlSiN, and including a Ca element partially replaced with an Eu element, wherein the phosphor has a median size d50 of 12.0 &#x3bc;m or more and 22.0 &#x3bc;m or less, as measured according to a laser diffraction scattering method, and has a specific surface area of 1.50 m/g or more and 10.00 m/g or less, as measured according to a BET method.

Red phosphor and light emitting device

An &#x3b1;-sialon phosphor particle containing Eu. At least one minute recess is formed on a surface of the &#x3b1;-sialon phosphor particle. The &#x3b1;-sialon phosphor particle is preferably produced by undergoing a raw material mixing step, a heating step, a pulverizing step, and an acid treatment step.

Phosphor particle, composite, light-emitting device, and method for producing phosphor particle

The purpose of the invention is to both improve the luminance of a SCASN-based phosphor and achieve deep-color rendering properties. Provided is a red phosphor having a main crystal phase having the same crystal structure as a crystal structure of CaAlSiN, the main crystal phase represented by the general formula MAlSiN, wherein an internal quantum efficiency, as measured when the red phosphor is excited by light having a wavelength of 455 nm, is 71% or more, and M in the general formula represents an element group containing at least three elements selected from Eu, Sr, Mg, Ca, and Ba, the element group containing Eu, Sr, and Ca as essentials, and a Eu content is 4.5 mass % or more and 7.0 mass % or less, a Sr content is 34.0 mass % or more and 42.0 mass % or less, and a Ca content is 0.8 mass % or more and 3.0 mass % or less.

Red phosphor and light emission device

A phosphor powder composed of &#x3b1;-sialon phosphor particles containing Eu. With regard to the phosphor powder, a volume-based median diameter (D) determined by a laser diffraction scattering method is equal to or more than 10 &#x3bc;m and equal to or less than 20 &#x3bc;m, and a diffuse reflectance with respect to light at a wavelength of 600 nm is equal to or more than 93% and equal to or less than 99%.

Phosphor powder, composite, and light-emitting device

An &#x3b1;-sialon phosphor particle containing Eu. At least one slit is formed on a surface of the &#x3b1;-sialon phosphor particle. The &#x3b1;-sialon phosphor particle is preferably produced by undergoing a raw material mixing step, a heating step, a pulverizing step, and an acid treatment step.

Growing community of inventors

Tokyo, Japan

Marina Takamura