Nichia Corporation

Toppan Printing Co., Ltd.

Yoshinori Murazaki

Hiroto Tamaki

Suguru Takashima

Masatoshi Kameshima

Yukihiro Hayashi

Atsutomo Hama

Shinpei Kinoshita

Shinichi Nagahama

Takahiro Naitou

Junji Takeichi

Masafumi Harada

Motokazu Yamada

Isamu Niki

Takafumi Sugiyama

Yoshiki Sato

Sadakazu Wakui

Naoto Morizumi

Takashi Ichihara

Kazuhiko Sakai

Naoki Saka

Tomotaka Honda

Hidesato Hagiwara

Yoshiko Ishimaru

Kiyotaka Arai

Atul Dnyaneshwar Sontakke

Arnoldus Jacobus Van Bunningen

Andries Meijerink

Provided is a wavelength converting member and a method of producing the same. Proposed is a wavelength converting member including: a fluorescent material containing at least one kind selected from a nitride-based fluorescent material and an oxynitride-based fluorescent material; and an aluminate containing at least one kind selected from the group consisting of a rare earth aluminate and an alkaline earth metal aluminate. Further, a method of producing a wavelength converting member, including: preparing a molded body obtained by mixing a fluorescent material containing at least one kind selected from a nitride-based fluorescent material and an oxynitride-based fluorescent material and an aluminate containing at least one kind selected from the group consisting of a rare earth aluminate and an alkaline earth metal aluminate; and sintering the molded body to obtain a wavelength converting member containing the fluorescent material and the aluminate, is proposed.

Wavelength converting member and method for producing the same

A boron nitride fluorescent material, having at least one light emission peak wavelength in a range of 480 nm or more and less than 650 nm as excited with light having a light emission peak wavelength in a range of 250 nm or more and 460 nm or less, and comprising: at least one element A selected from the group consisting of alkaline earth metal elements; nitrogen and boron; and optionally at least one element M1 selected from the group consisting of Tb, Sm, Pr, Ce, Mn, and Yb.

Boron nitride fluorescent material, and method for producing the same

Provided is a method of producing a wavelength conversion member, comprising the steps of forming a fluorescent material layer on the top surface of a substrate and filling a translucent material into the fluorescent material layer. The fluorescent material layer contains fluorescent material particles and has voids between the fluorescent material particles. The translucent material has a lower refractive index than the fluorescent material particles and is filled into a part of the voids to form a filled region in a manner to allow the voids to be partially left unfilled with the translucent material.

Method of producing wavelength conversion member

A wavelength converting member includes at least a first, second, and third regions, circumferentially on a disc-shaped light-transmissive substrate. The first region includes, from a light incident direction, a first and second phosphor layers. The first phosphor layer includes a first phosphor to absorb at least part of incident light and to emit a first light having a wavelength different from the incident light. The first phosphor layer defines an indentation in a surface on the second phosphor layer side, with a depth a half or more of the thickness of a portion of the first phosphor layer absent of the indentation. The second phosphor layer includes a second phosphor to absorb at least part of the first light emitted by the first phosphor and to emit a second light having a wavelength different from the first light, and is disposed in the indentation of the first phosphor layer.

Wavelength converting member and projector including the wavelength converting member

In a semiconductor light-emitting device, light from a laser diode is output to the outside after the luminance of the light being enhanced. It includes a support body provided with lead terminals, one or more laser diodes mounted on the support body, a cylindrical reflector fixed to the support body to surround the laser diode(s) and provided with a light reflection surface formed on an inner surface thereof, and a cap placed to cover an opening distal end face of the reflector and held at an opening distal end part of the reflector, the cap being provided at a central part thereof with a solid fluorescent member including a fluorescent substance that is excited by the light from the laser diode and emits light different in colors from light emitted by the laser diode.

Light-emitting device

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 light emitting device includes an excitation light source that emits excitation light, a wavelength conversion member, a light guide, and a light guide distal end member. The wavelength conversion member absorbs the excitation light emitted from the excitation light source, converts its wavelength, and releases light of a predetermined wavelength band. The light guide in which the center part (core) of its cross section has a refractive index that is higher than the refractive index of the peripheral portion (cladding) guides the excitation light emitted from the excitation light source to the wavelength conversion member. The light guide distal end member supports a distal end of the light guide on the wavelength conversion member side. The light guide distal end member is formed from a material that reflects the excitation light and/or the light that has undergone wavelength conversion.

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

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

A light emitting device includes a light emitting elementthat has a light emission peak wavelength in a range from 300 nm to 530 nm, and a phosphorthat absorbs light from the light emitting elementand converts the wavelength of the light to emit light with a light emission peak wavelength different from the light emitting element. The phosphor is represented by the general formula MEuMMOwhere x, m and n fall within ranges 0.0001&#x2266;x&#x2266;0.3, 1.0&#x2266;m&#x2266;2.5 and 0&#x2266;n&#x2266;2.5, Mis at least one element selected from the group consisting of Mg, Ca, Sr, Ba and Zn, Mis at least one element selected from the group consisting of Si, Ge and Sn, and Mis at least one element selected from the group consisting of B, Al, Ga, In and rare earth elements.

Phosphor and light emitting device

An optical component that can be attached to an end portion of an optical guiding member, and a light converting member used in the optical component. The optical component comprises a cap having an engaging portion defining a bore engaged with an end member of a light guiding member, and an arranging portion defining a opening connected to the bore in the engaging portion, and a light converting member disposed in the opening formed in the arranging portion.

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Anan, Japan

Yoshinori Murazaki