Mitsubishi Chemical Corporation

Hideaki Kaneda

Naoto Kijima

Yasuo Shimomura

Eiji Hattori

Shin Kawana

Kimiya Takeshita

Hiromu Watanabe

Naoki Sako

Mitsunori Mochida

Noriko Endou

Itaru Sakamoto

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

To attain a high color reproducibility as a whole image without impairing the brightness of the entire image. A color image display device comprising a combination of light shutters, a color filter having color elements of at least three colors of red, green and blue corresponding to the light shutters, and a backlight for transmission illumination, wherein a light source to be used for the backlight comprises a combination of a blue or deep blue LED and a phosphor, and the relationship between the NTSC ratio W as a color reproduction range of the color image display element and the light use efficiency Y is represented Y&#x2267;&#x2212;0.38 W+51 (wherein W&#x2267;87).

Color image display device

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

A method for producing a CASN phosphor which has an emission peak wavelength in a long wavelength range and which is prevented from being reduced in emission peak intensity, a phosphor suitable for use in displays having a NTSC ratio higher than that of conventional one, a composition containing the phosphor, a light-emitting device containing the phosphor, a display, and a lighting system. A method for producing an inorganic compound represented by the following formula from a feedstock in which the amount of Si is greater than one mole and less than 1.14 moles per mole of Al:M1M2AlSiX&#x2003;&#x2003;(I)where M1 represents an activation element containing at least Eu, M2 represents one or more selected from alkaline-earth metal elements, X represents one or more selected from the group consisting of O and N, and a and b each represent a positive number satisfying the inequalities 0&#x3c;a&#x2266;0.1 and 0.8&#x2266;a+b&#x2266;1.

Method for producing inorganic compound, phosphor, phosphor-containing composition, light-emitting device, lighting system, and display device

The present invention relates to color image display devices having a combination of light shutters, a color filter having color elements of at least three colors of red, green and blue corresponding to the light shutters, and a backlight for transmission illumination, where the backlight has a phosphor layer or a phosphor film, and the phosphor layer or the phosphor film has a compound having at least element M, element A, element D, element E and element X, where Mis at least one element selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb, and includes at least Eu, A is at least one element selected from bivalent metal elements other than the element M, D is at least one element selected from tetravalent metal elements, E is at least one element selected from trivalent metal elements, and X is at least one element selected from O, N and F.

Blue color composition for color filter, color filter, and color image display device

To enhance emission efficiency and color rendering, a light emitting devicecomprises: at least one light source; at least one first emitting sectionhaving at least one sort of luminescent material that can emit light including a wavelength component that is longer than the light emitted from light sourcewhen excited by the light emitted from light source; at least one second emitting sectionhaving at least one sort of luminescent material that can emit light including a wavelength component that is longer than the light emitted from first emitting sectionwhen excited by the light emitted from light sourceand first emitting section; wherein light emitting devicecomprises at least one light shielding unitthat protects at least a part of the light emitted from first emitting sectionfrom entering second emitting section

Light emitting device, lighting system, backlight unit for display device and display device

The invention relates to a blue composition for a color filter to realize an image having a high color purity corresponding to the emission wavelength of an improved LED backlight, a color filter and a color image display device.

To enhance emission efficiency and color rendering, a light emitting device includes: at least one light source; at least one first emitting section having at least one sort of luminescent material that can emit light including a wavelength component that is longer than the light emitted from light source when excited by the light emitted from light source; at least one second emitting section having at least one sort of luminescent material that can emit light including a wavelength component that is longer than the light emitted from first emitting section when excited by the light emitted from light source and first emitting section; wherein light emitting device includes at least one light shielding unit that protects at least a of the light emitted from first emitting section from entering second emitting section.

Light emitting device, lighting system, backlight unit for display device, and display device

A light emitting device for enhancing emission efficiency and color rendering, comprising: a light source; a first emitting section having a luminescent material emitting light including a wavelength component longer than that of light from the light source when excited by the light from the light source; a second emitting section having a luminescent material emitting light including a wavelength component longer than that of the light from the first emitting section when excited by the lights from the light source and the first emitting section; and a light exit side from which the light from the light source, the first light-emitting section and the second light-emitting section emerges outside; and the first emitting section and the second emitting section are opened at the light exit side, and an area of a boundary surface between the first emitting section and the second emitting section is equal to or less than fifty percent of the surface area of the first emitting section.

Light emitting device, and lighting system, backlight for display and display using the same

A method of manufacturing a magnetic recording medium having at least a magnetic layer, optionally by means of an underlayer, on a non-magnetic substrate, and occasionally having a protective layer disposed on the magnetic layer, comprises irradiating to the surface of the non-magnetic substrate, the underlayer, the magnetic layer, the protective layer or the magnetic recording medium, a laser beam from a semiconductor laser module that moves relatively to the non-magnetic substrate, thereby applying a texturing; and a semiconductor laser texturing apparatus comprises a substrate rotating mechanism, a semiconductor laser module including a semiconductor laser beam source, a collimator for converting a semiconductor laser beam into a parallel beam and a light focusing mechanism for irradiating the laser beam to a projection-forming surface of a substrate supported rotatably by the substrate rotating mechanism, and a relative moving mechanism for the substrate supported rotatably by the substrate rotating mechanism and the semiconductor laser module.

Growing community of inventors

Ushiku, Japan

Hideaki Kaneda