Kasei Optonix, Ltd.

Mitsubishi Chemical Corporation

Akihiro Ohto

Takayuki Hisamune

Kouhei Matsuda

Shiho Takashina

Satoshi Shimooka

The present invention related to a nitride phosphor represented by the following general formula (1), the nitride phosphor having an x value of less than 0.43 in luminescent color coordinates (x, y) upon being excited with excitation light of 455 nm, and a reflectance Ra of 89% or more at 770 nm;SiN:Z&#x2003;&#x2003;(1),wherein Ln is a rare-earth element excluding the element used as an activator, Z is an activator, x satisfies 2.7&#x2266;x&#x2266;3.3, y satisfies 5.4&#x2266;y&#x2266;6.6, and n satisfies 10&#x2266;n&#x2266;12.

Nitride phosphor and method for producing the same

A phosphor improved against luminance deterioration with time under vacuum ultraviolet irradiation, a phosphor paste composition, and a vacuum ultraviolet excitation light emitting element high in luminance retaining rate and improved in luminance, are presented. An alkaline earth aluminate phosphor which is a phosphor represented by the formula a (MEu)O.6AlO(wherein M represents at least one alkaline earth metal element selected from the group consisting of Ba, Sr and Ca, and x and a satisfy 0&#x3c;x&#x3c;1 and O.9&#x2266;a&#x2266;1.8, respectively) and which has a wide-band peak over an angle region of diffraction angle (2&#x3b8;) of from 28&#xb0; to 31&#xb0; in powder diffraction X-ray spectrum by CuK&#x3b1;1 characteristics X-ray, and a vacuum ultraviolet excitation light emitting element provided with a fluorescent layer made of the phosphor.

Alkaline earth aluminate phosphor, phosphor paste composition and vacuum ultraviolet excitation light emitting element

An aluminate phosphor activated with Eu or coactivated with Eu and Mn, which contains sulfur; a process for its production; a phosphor paste composition; and a vacuum ultraviolet ray excitation type light-emitting device having a fluorescent layer made of such a phosphor.

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Kanagawa, Japan

Akihiro Ohto