Mitsubishi Chemical Corporation

Kasei Optonix, Ltd.

Other

Yasuo Shimomura

Naoto Kijima

Hideaki Kaneda

Tomoyuki Kurushima

Kimiya Takeshita

Takashi Hase

Yutaka Mori

Keiichi Seki

Kikuo Okuyama

Etsuo Shimizu

Eiji Hattori

Takayuki Hisamune

Masakazu Nabu

Kouichi Adachi

Chisato Miura

Koichi Toriumi

Tetsuji Umebara

Ilgnatius Wuled Lenggoro

Kumie Shimizu, Legal Representative

Nobuhiro Kodama

Tomoko Takahashi

Hideaki c/o Mitsubishi Chemical Corp Kaneda

To achieve a light-emitting device emitting light with high brightness, closer to natural light, and less color shift due to a small change in intensity of emitted light, in a light-emitting device including a light source emitting light by driving current and at least one wavelength-converting material absorbing at least part of the light from the light source and emitting light having a different wavelength, the color coordinate x(17.5) and the color coordinate y(17.5) of the light emitted at a driving current density of 17.5 A/cmand the color coordinate x(70) and the color coordinate y(70) of the light emitted at a driving current density of 70 A/cmsatisfy the following Expressions (D) and (E):&#x2212;0.006&#x2266;(17.5)&#x2212;(70)&#x2266;0.006&#x2003;&#x2003;(D),&#x2212;0.006&#x2266;(17.5)&#x2212;(70)&#x2266;0.006&#x2003;&#x2003;(E).

Light-emitting device, white light-emitting device, illuminator, and image display

To enhance luminance and color rendering of a light emitting device comprising phosphors as wavelength converting material and at least one semiconductor light emitting device that emits visible light, as said phosphors, are used phosphors which are one or more kinds of phosphors selected from a group consisting of oxides, oxynitrides and nitrides, and are a mixture consisting of two or more kinds of phosphors whose luminous efficiency is 35% or higher when excited by the visible light from said semiconductor light emitting device at room temperature. In addition, said mixture contains a first phosphor, and a second phosphor that is different from said first phosphor and capable of absorbing emitted light from said first phosphor, and said first phosphor is contained 85 weight % or more of said mixture of phosphors.

Phosphor composition, light-emitting device having the same, cured product having the same, lighting system having the same, and display having the same

Light emitting device, and lighting system, image display using the same

The present invention relates to a phosphor represented by the following general formula (I), comprising: a composite oxide containing a divalent and trivalent metal elements as a host crystal; and at least Ce as an activator element in said host crystal, wherein the phosphor has a maximum emission peak in a wavelength range of from 485 nm to 555 nm in the emission spectrum at room temperature:MMMO&#x2003;&#x2003;(I)wherein Mrepresents an activator element containing at least Ce; Mrepresents a divalent metal element; Mrepresents a trivalent metal element; a is a number within a range of 0.0001&#x2266;a&#x2266;0.2; b is a number within a range of 0.8&#x2266;b&#x2266;1.2; c is a number within a range of 1.6&#x2266;c&#x2266;2.4; and d is a number within a range of 3.2&#x2266;d&#x2266;4.8. Further, a light emitting device comprising said phosphor and a display and a lighting system having said light emitting device as a light source are disclosed. In accordance with the present invention, a phosphor which can be easily produced and can provide a light emitting device having a high color rendering, a light emitting device comprising the phosphor, and a display and a lighting system comprising the light emitting device as a light source can be provided.

Phosphor, light-emitting device using same, image display and illuminating device

The present invention relates to a phosphor that satisfies requirements (1) to (3): The phosphor of the present invention has a high luminous efficiency and emits light of orange to red with high luminance. The use of the phosphor makes it possible to produce a light-emitting device, an illumination apparatus, and an image display, having a high efficiency and excellent color rendering properties.

Phosphor and light-emitting device using same

To provide a phosphor having nearly spherical shapes, the phosphor has an elemental ratio represented by the formula below, and contains at least two kinds of Li, Na, K, Rb, Cs, P, Cl, F, Br, I, Zn, Ga, Ge, In, Sn, Ag, Au, Pb, Cd, Bi and Ti.MMMO(Mrepresents Cr, Mn, Fe, Co, Ni, Cu, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm or Yb, Mmainly represents a bivalent metal element, Mmainly represents a trivalent metal element, and a, b, c and d are 0.0001&#x2266;a&#x2266;0.2, 0.8&#x2266;b&#x2266;1.2, 1.6&#x2266;c&#x2266;2.4 and 3.2&#x2266;d&#x2266;4.8, respectively.)

Phosphor and production method thereof, and phosphor-containing composition, light emitting device, image display and lighting system

A phosphor (A) comprising a host material composed of a compound having a garnet crystal structure represented by the general formula (I):MMMO&#x2003;&#x2003;(I)(wherein Mis a divalent metal element, Mis a trivalent metal element, Mis a tetravalent metal element containing at least Si, a is the number of 2.7 to 3.3, b is the number of 1.8 to 2.2, c is the number of 2.7 to 3.3, and d is the number of 11.0 to 13.0), and a luminescent center ion incorporated in the host material; a light emitting device (B) comprising the phosphor as a wavelength conversion material and a semiconductor light emitting element capable of emitting a light in the range of from ultraviolet light to visible light; and a display (C) and a lighting system (D) using the light emitting device (B) as a light source. The above phosphor can be readily produced, and can provide a light emitting device having a high color rendering property.

Phosphor, light emitting device using phosphor, and display and lighting system using light emitting device

To present a green- to yellow-emitting phosphor whereby a light-emitting device having high color rendering properties and high luminance can be obtained, a light-emitting device employing such a phosphor, and an image display device and a lighting system, containing such a light-emitting device. A phosphor made of a compound represented by the following formula (I), which comprises, as matrix, a compound of a garnet structure and which contains, as a luminescent center ion, a metal element in the matrix:MMXMMO&#x2003;&#x2003;(I)wherein Mis Mg and/or Zn, Mis a bivalent metal element excluding Mg and Zn, X is a metal element as a luminescent center ion composed mainly of Ce, Mis a trivalent metal element excluding X, Mis a tetravalent metal element, and a, b, c, d and e are numbers satisfying the following formulae, respectively:0.001&#x2266;a&#x2266;0.52.5&#x2266;b&#x2266;3.30.005&#x2266;c&#x2266;0.51.5&#x2266;d&#x2266;2.3={()&#xd7;2+()&#xd7;3+12}/2.

Fluorescent material, fluorescent device using the same, and image display device and lighting equipment

The present invention is to provide a phosphor of minimum particle size having an excellent crystallinity and a high brightness higher than conventional crude particles, which is usable for a highly precise display, a highly bright illuminating element or illuminating apparatus, a high speed immunoassay system or the like, i.e. a phosphor having a substantially spherical outer shape, which comprises primary particles having a median diameter Din a range of from 0.05 &#x3bc;m to 1 &#x3bc;m and secondary particles having a median diameter Din a range of from 0.1 &#x3bc;m to 2 &#x3bc;m, wherein at least 50 vol % of the total secondary particles has an aspect ratio of at least 0.8 and an internal quantum efficiency is in a range of from 0.8 to 1.

Phosphor and its production process

A process for producing fine phosphor particles having a high crystallinity, having a small amount of aggregated particles and comprising fine particles, thus capable of forming a homogeneous and dense high brightness fluorescent layer when applied to e.g. a cathode ray tube, a fluorescent lamp or PDP, and having a high purity, a uniform chemical composition and excellent emission properties, at a low cost, is provided. A process for producing a phosphor, which comprises heating droplets of a solution containing metal elements constituting the phosphor to carry out pyrolysis to obtain the phosphor, wherein the above heating is carried out in the coexistence of an additive comprising a metal or a metal compound to carry out the pyrolysis at an average crystal growth rate of at least 0.002 &mgr;m /sec.

An aluminate phosphor comprising (a) at least one element selected from the group consisting of Ba, Sr and Ca, (b) Eu, (c) Mg and/or Zn, (d) optionally Mn and (e) Al, said aluminate phosphor comprising a crystalline inorganic compound which shows, in its powder X-ray diffraction pattern upon incidence of X-rays of CuK.alpha..sub.1, no peak at Miller index 008 independent of a diffraction peak at Miller index 110.

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Yokohama, Japan

Yasuo Shimomura