Mitsubishi Chemical Corporation

Hiroyasu Yamada

Naoto Kijima

Takatoshi Seto

Keiichi Seki

Ryuji Adachi

Tatsuya Inoue

A phosphor includes a crystal phase of a formula (Ln,Ca,Ce)SiN. In this formula, &#x3b1; is from &#x2212;0.1 to 1.5, inclusive. When an object color of the phosphor is expressed by the L*a*b* color system, the value of (a*+b*)satisfies 71&#x2266;(a*+b*). Also in the formula, Ln is La, Gd, Lu, Y, Sc, or any combination of these. When the phosphor is excited with light having a wavelength of 455 nm, it emits a color wherein x is from 0.400 to 0.570 inclusive, and y is from 0.420 to 0.590, inclusive, as expressed in the CIE standard coordinate system.

Phosphor, method for producing phosphor, phosphor-containing composition, light-emitting device, lighting system and image display device

To provide a yellow to orange phosphor which has high luminance and excellent temperature characteristics and which also has high luminance when mixed with a phosphor of a different color. A phosphor containing a crystal phase represented by the following formula [I], wherein when its object color is expressed by the L*a*b* color system, the values of a*, b* and (a*+b*)satisfy &#x2212;20&#x2266;a*&#x2266;&#x2212;2, 71&#x2266;b* and 71&#x2266;(a*+b*), respectively:RMASiAlON&#x2003;&#x2003;[I].

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Odawara, Japan

Hiroyasu Yamada