Denka Company Limited

Denki Kagaku Kogyo Kabushiki Kaisha

Tomohiro Nomiyama

Yusuke Takeda

Shintaro Watanabe

Masaru Miyazaki

Tatsuya Okuzono

Marina Takamura

Manabu Kobayashi

Suzuya Yamada

Ryozo Nonogaki

Masayoshi Ichikawa

Mitsuru Kawagoe

Hisayuki Hashimoto

Hideyuki Emoto

Keita Kobayashi

Saori Inoue

Go Takeda

Taiyo Yamaura

Shunsuke Mitani

A europium-doped β-sialon phosphor particle. When the element concentration of a Si atom on the surface portion of the particle that is obtained by analyzing a cross section of the phosphor particle by the energy dispersive X-ray analysis method is indicated by Ps [at %], and the element concentration of a Si atom near the center of the particle that is obtained by an analysis by the same method is indicated by Pc [at %], the Pc-Ps value is 3 at % or more.

Beta-sialon phosphor particle and light emitting device

A europium-doped β-sialon phosphor, in which, when the ratio of an aluminum element at a depth of 8 nm from the surface of the phosphor, which is obtained by X-ray photoelectron spectroscopy, is indicated by P[at %], and the ratio of an aluminum element at a depth of 80 nm from the surface of the phosphor is indicated by P[at %], P/P≤0.9 is satisfied. A light emitting device containing this β-sialon phosphor.

Beta-sialon phosphor and light emitting device

A β-sialon phosphor represented by general formula: SiAlON(0<z<4.2) has as a host crystal, a crystal structure identical to that of a β-sialon crystal phase and having a bulk density of 0.80 g/cmor more and 1.60 g/cmor less. Also, a light-emitting element includes the β-sialon phosphor and a semiconductor light-emitting element capable of exciting the β-sialon phosphor.

β-SiAlON phosphor and light-emitting apparatus

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 powder composed of α-sialon phosphor particles containing Eu. The phosphor powder has an ammonium ion concentration Cof the phosphor powder of equal to or more than 15 ppm and equal to or less than 100 ppm, which is determined from the following extracted ion analysis. (Extracted Ion Analysis A) 0.5 g of a phosphor powder is added to 25 ml of distilled water in a polytetrafluoroethylene (PTFE)-made container with a lid and held at 60° C. for 24 hours, and then a total mass Mof ammonium ions included in an aqueous solution obtained by removing a solid content from the solution by filtration is determined using ion chromatography. Then, Cis determined by dividing Mby the mass of the phosphor powder.

Phosphor powder, composite, 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

A phosphor powder contains an EU-activated &#x3b2;-type sialon phosphor particles. When a median diameter in the phosphor powder having not been subjected to an ultrasonic homogenizer treatment is set as D1 and a median diameter in the phosphor powder having been subjected to an ultrasonic homogenizer treatment is set as D2, 1.05&#x2264;D1/D2&#x2264;1.70. A dispersion liquid in which 30 mg of the phosphor powder is uniformly dispersed in 100 ml of a 0.2% concentration of a sodium hexametaphosphate aqueous solution is added to a columnar container of which a bottom surface has an inner diameter of 5.5 cm. Then, the dispersion liquid is irradiated with ultrasonic waves for 3 minutes at a frequency of 19.5 kHz, and an output of 150 W, in a state where a cylindrical tip, which has an outer diameter of 20 mm, of an ultrasonic homogenizer is immersed in the dispersion liquid in &#x2265;1.0 cm.

Phosphor powder and light-emitting device

A &#x3b2;-sialon phosphor that is a solid solution of europium, in which Dis 7.0 &#x3bc;m or more and 20.0 &#x3bc;m or less and (D&#x2212;D)/Dis 0.60 or less, where Dis a 50% area diameter of primary particles of the &#x3b2;-sialon phosphor, and Dis a 10% area diameter of the primary particles of the &#x3b2;-sialon phosphor. Primary particles are defined as single-crystal particles distinguished for each crystal orientation by identifying the crystal orientation of individual particles of the &#x3b2;-sialon phosphor by an electron backscatter diffraction image method. Dand Dare obtained by image analysis of the cross-sectional area of the primary particles.

B-sialon 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

A phosphor powder composed of &#x3b1;-sialon phosphor particles containing Eu. In a case where an internal quantum efficiency after the phosphor powder is held at 600&#xb0; C. for 1 hour in an air atmosphere is defined as P1 and an internal quantum efficiency after the phosphor powder is held at 700&#xb0; C. for 1 hour in an air atmosphere is defined as P2, P1 is equal to or more than 70% and (P1&#x2212;P2)/P1&#xd7;100 is equal to or less than 2.8%.

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%.

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.

An &#x3b1;-sialon phosphor represented by general formula: MEu(Si,Al)(O,N), where M represents at least one or more elements selected from Li, Mg, Ca, Y and a lanthanoid (excluding La and Ce), 0&#x3c;x, and 0&#x3c;y, where the phosphor includes, as a host crystal, a crystal structure identical to that of an &#x3b1;-sialon crystal phase, and the phosphor has a bulk density of 1.00 g/cmor more and 1.80 g/cmor less. Also provided is a light-emitting element including the &#x3b1;-sialon phosphor and a semiconductor light-emitting element capable of exciting the &#x3b1;-sialon phosphor.

Alpha-Sialon fluorescent body and light-emitting device

An object of the present invention is to provide a red phosphor, a light emitting element using the phosphor, and a light emitting device using the light emitting element. A phosphor represented by the general formula: CaEuSiAlNin which x+y is 1.0 or more and 1.1 or less, y is 0.004 or more and 0.012 or less, the phosphor being activated with Eu, and some of the Ca element(s) being substituted with the Eu element(s), wherein the phosphor has a lattice constant a of 0.9747 nm or more and 0.9770 nm or less, and a lattice constant c of 0.5050 nm or more and 0.5055 nm or less, and wherein the phosphor has a Ca content of 27.8% by mass or more and 28.8% by mass or less, a dissolved oxygen content in the phosphor of 0.3% by mass or more and 1.2% by mass or less, and an Eu content of 0.4% by mass or more and 1.2% by mass or less.

Growing community of inventors

Machida, Japan

Tomohiro Nomiyama