Nichia Corporation

Toppan Printing Co., Ltd.

Suguru Takashima

Hiroto Tamaki

Masatoshi Kameshima

Yoshinori Murazaki

Takahiro Naitou

Shinpei Kinoshita

Tomohisa Kishimoto

Masafumi Harada

Motokazu Yamada

Tomokazu Yoshida

Junji Takeichi

Masato Aihara

Kazuhiko Sakai

Shoji Hosokawa

Hidesato Hagiwara

Kenichi Aoyagi

Takayuki Shinohara

Takeshi Kihara

Yoshiko Ishimaru

Hitomi Miki

The present invention provides a method for producing a fluoride fluorescent material comprising a chemical composition represented by the following formula (I):K[MMnF]&#x2003;&#x2003;(I)wherein M is at least one element selected from the group consisting of elements belonging to Groups 4 and 14 of the Periodic Table, and a is a value that satisfies the relationship: 0&#x3c;a&#x3c;0.2, and a minimum value of a weight median diameter of the fluoride fluorescent material is greater than or equal to 30 &#x3bc;m. The method comprises mixing together a first solution containing at least first complex ions comprising tetravalent manganese and hydrogen fluoride, a second solution containing at least potassium ions and hydrogen fluoride and a third solution containing at least second complex ions comprising at least one element selected from the group consisting of elements belonging to Groups 4 and 14 of the Periodic Table and fluorine ions.

Method for producing fluoride fluorescent material

The present invention provides a fluoride fluorescent material comprising a chemical composition represented by the following formula (I):K[MMnF]&#x2003;&#x2003;(I)wherein M is at least one element selected from the group consisting of elements belonging to Groups 4 and 14 of the Periodic Table, and a is a value that satisfies the relationship: 0&#x3c;a&#x3c;0.2, and a minimum value of a weight median diameter of the fluoride fluorescent material is 30 &#x3bc;m.

Fluoride fluorescent material and light emitting device using the same

The light emitting device comprises a light emitting element, a red phosphor formed from a nitride phosphor and a green phosphor formed from a halosilicate, wherein the emission spectrum has a first peak at a wavelength between 440 nm and 470 nm, a second peak at a wavelength between 510 nm and 550 nm and a third peak at a wavelength between 630 nm and 670 nm, and the minimum relative light emission intensity between the second peak wavelength and the third peak wavelength is 80% or less of whichever the lower of the relative light emission intensity of the second peak wavelength and the relative light emission intensity of the third peak wavelength.

Light emitting device including light emitting element and phosphor

A light emitting device that has excellent color rendering performance is provided. The light emitting device comprises, a light emitting element, a red phosphor formed from a nitride phosphor that emits light when excited by the light from the light emitting element, a green phosphor formed from a halosilicate that emits light when excited by the light from the light emitting element and a YAG phosphor emitting light when excited by the light from the light emitting element.

Light emitting device

A lamp includes a light-emitting body that converts electric energy into light energy and a translucent glass covering the light-emitting body, wherein a phosphor layer is provided on at least inner or outer surface of the translucent glass. The phosphor layer includes a fluorescent material including a first phosphor that at least partially converts energy emitted by an excitation source, which emits ultraviolet having a wavelength of about 365 nm, to a first emission spectrum that is different from the energy, and a second phosphor that at least partially converts the first emission spectrum to a second emission spectrum. Peak wavelengths of the emission spectrum of the first and second phosphors have a relation of complementary colors so that when the light created due to the peak wavelengths of the first and second phosphors are mixed, the resulting light is in the white region.

Fluorescent material and light-emitting device

Disclosed a liquid crystal display device including a backlight device including a white-emitting LED device which emits a white light arising from a color mixture created through a combination of a blue-emitting LED, a red-emitting phosphor and a green-emitting phosphor, and a color filter equipping color pixels exhibiting plural colors including a red pixel and formed on a transparent substrate, wherein the white-emitting LED device is enabled to exhibit an emission spectrum having a first peak wavelength falling within a range of 440-470 nm, a second peak wavelength falling within a range of 510-550 nm and a third peak wavelength falling within a range of 630-670 nm, and a red display chromaticity of the liquid crystal display device is confined within a region bounded by lines connecting four points (0.620, 0.280), (0.620, 0.300), (0.680, 0.315) and (0.680, 0.280) based on an xy chromaticity coordinate system.

Liquid crystal display device and color filter for liquid crystal display device

A light emitting device includes a wavelength converting member for absorbing light emitted by an exciting light source and emitting light of a different wavelength. With a wavelength at which the light from the exciting light source has a maximum energy intensity denoted as a first wavelength, a wavelength at which the light from the wavelength converting member has a maximum energy intensity denoted as a second wavelength, a wavelength lying between the first and second wavelengths at which the light from the light emitting device has a minimum energy intensity denoted as a third wavelength, and 650 nm denoted as a fourth wavelength, then the light emitting device has an emission spectrum such that the proportion of the energy intensity at the first wavelength to the energy intensity at the third wavelength is in a range from 100:15 to 100:150, and the proportion of the energy intensity at the first wavelength to the energy intensity at the fourth wavelength is in a range from 100:45 to 100:200.

To provide a phosphor containing a comparatively much red component and having high light emitting efficiency, high brightness and further high durability, the nitride phosphor is represented by the general formula LMN:R or LMON:R (wherein L is at least one or more selected from the Group II Elements consisting of Mg, Ca, Sr, Ba and Zn, M is at least one or more selected from the Group IV Elements in which Si is essential among C, Si and Ge, and R is at least one or more selected from the rare earth elements in which Eu is essential among Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er and Lu.); contains the another elements.

Nitride phosphor and production process thereof, and light emitting device

An oxynitride phosphor consisting of a crystal containing at least one or more of Group II elements selected from the group consisting of Be, Mg, Ca, Sr, Ba and Zn, at least one or more of Group IV elements selected from the group consisting of C, Si, Ge, Sn, Ti, Zr and Hf, and a rare earth element being an activator R, thereby providing a phosphor which is excited by an excitation light source at an ultraviolet to visible light region and which has a blue green to yellow luminescence color that is wavelength converted.

Oxynitride phosphor and production process thereof, and light-emitting device using oxynitride phosphor

A red phosphor with excellent luminescent characteristics, and a light emitting device that uses this phosphor are provided. The phosphor is a nitride phosphor that is activated by europium, and absorbs light from the near ultraviolet range to the blue range to emit red light. The nitride phosphor has the following general formula,MAlSiBN:Euwhere M is at least one element selected from the group consisting of Mg, Ca, Sr and Ba. In the general formula, w, x, y and z fall within the following ranges.

Nitride phosphor, method for producing this nitride phosphor, and light emitting device that uses this nitride phosphor

An object of the present invention is to provide a light emitting device which emits light of deep yellowish color with high luminance. The light emitting device of the present invention comprises a light emitting element having a peak emission wavelength shorter than 490 nm, a fluorescent material for wavelength conversion which absorbs light from the light emitting element and emits light of a wavelength longer than that of the light from the light emitting element, and a filter which cuts off a part of a mixed light produced by mixing the light of the light emitting element and the light of the fluorescent material, wherein the light transmitted through the filter has a chromaticity coordinate on the chromaticity diagram according to CIE 1931 plotted in a region defined by a first point (x=0.450, y=0.450), a second point (x=0.250, y=0.650), a third point (x=0.350, y=0.750) and a fourth point (x=0.250, y=0.750) and in the region defined by a closed curve consisting of the monochromatic locus and the purple boundary.

Yellow light emitting device with high luminance

A light emitting device that light of various colors by blending lights emitted by two or more kinds of fluorescent materials which are substantially directly excited by light emitted by an excitation source having principal emission peak in a range from 250 nm to 500 nm. Each of the fluorescent materials is of a direct-transition type.

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Anan, Japan

Suguru Takashima