Nichia Corporation

Makiko Iwasa

Yuji Sato

Kazushige Fujio

Hiroki Fukuta

Shoji Hosokawa

Kazuya Nishimata

Yasuaki Mashima

Miyuki Kurata

Eri Matsuka

Masami Kumano

Atsushi Yoshinari

Masato Okawa

Takahiro Kubo

A light-emitting device includes a substrate, a wiring, a light-emitting element configured to emit light having a main wavelength in a range from 500 nm to 560 nm, and a diffusion member. When chromaticity x and chromaticity y of an emission color of the light-emitting device are measured in each of first and second measurement planes in a range in which an angle at the center of the outer shape is in a range from ±60° with reference to a perpendicular line passing through the center of the diffusion member, an average value α of a difference between a maximum value and a minimum value of a chromaticity difference Δx of the chromaticity x measured in the first measurement plane and a difference between a maximum value and a minimum value of a chromaticity difference Δx of the chromaticity x measured in the second measurement plane is less than 0.0024.

Light emitting device and diffusion member used therein

Provided is a light-emitting device having a high luminous flux. The light-emitting device comprises a light-emitting elementthat has a dominant wavelength in a range of 380 nm or more and 485 nm or less, and a fluorescent material layerthat includes a fluorescent material emitting light by being excited by light emitted from the light-emitting element, and a neodymium compound, wherein the light-emitting device emits light having a dominant wavelength in a range of 584 nm or more and 780 nm or less.

Light-emitting device

A wavelength conversion member includes: a light-transmissive member; and a wavelength conversion material located on a surface of the light-transmissive member and including: a resin, a phosphor with a median particle diameter of 10 μm or more and 30 μm or less, wherein an amount of the phosphor in the wavelength conversion material is 165 parts by mass or more and 400 parts by mass or less relative to 100 parts by mass of the resin, and a filler with a median particle diameter of 5 μm or more and 40 μm or less, wherein an amount of the filler in the wavelength conversion material is 5 parts by mass or more and 90 parts by mass or less relative to 100 parts by mass of the resin. A mixture volume ratio of the phosphor and the filler to the resin is 0.5 or more and 1.0 or less.

Wavelength conversion member and method of manufacturing the same

A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm to 420 nm and a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 2000 K to 7500 K as measured according to JIS Z8725, and the light emitting device has a spectral distribution in which, when the integral value over a wavelength range of 380 nm to 780 nm is normalized to 100%, the proportion of an integral value over a wavelength range of 380 nm to 420 nm is 15% or more, and the ratio a as defined by the expression (1) is 0.9 or more and 1.6 or less.

Light emitting device

A light emitting device includes a light emitting element having a dominant wavelength in a range of 400 nm or more and 500 nm or less, and a wavelength conversion member that is arranged on a light emitting side of the light emitting element and includes a rare earth aluminate fluorescent material having a composition represented by the following formula (I), wherein the light emitting device emits light having a dominant wavelength in a range of 475 nm or more and 500 nm or less, and wherein the light emitting device emits light having an S/P ratio of 6.5 or less derived from the formula (1), which is the ratio of a luminous flux in scotopic vision relative to a luminous flux in photopic vision:(LuLnCe)(AlGa)O&#x2003;&#x2003;(I)

Light emitting device emitting light bright in both scotopic vision and photipic vision

A light emitting device includes: a light emitting element having a light emission peak wavelength in a range of 380 nm or more and 485 nm or less; a wavelength conversion member including a fluorescent material layer disposed on a light emission side of the light emitting element and containing a fluorescent material having a reflectance to light having a wavelength of 450 nm of 10% or less and a light emission peak wavelength in a range of 610 nm or more and 780 nm or less, and a dielectric multilayer film disposed on a light emission side of the fluorescent material layer.

A light emitting device includes: a light emitting element having a dominant wavelength in a range greater than or equal to 380 nm and less than or equal to 470 nm; a wavelength conversion member that is disposed on the light emitting element and includes: a translucent member, and a first fluorescent material layer interposed between the light emitting element and the translucent material, the first fluorescent material layer comprising a resin that contains a first fluorescent material, and the first fluorescent material comprising at least one compound selected from (Ca, Sr)AlSiN: Eu and (Ca, Sr, Ba)SiN: Eu; and a covering member that covers sides of the wavelength conversion member and surrounds the light emitting element, the covering member comprising light reflecting material and a second fluorescent material, and the second fluorescent material comprising at least one compound selected from (Ca, Sr)AlSiN: Eu and (Ca, Sr, Ba)SiN: Eu.

A light emitting device has a covering member. The covering member includes light reflecting material and a second fluorescent material, and a dominant wavelength of an emission spectrum of the second fluorescent material differs from a dominant wavelength of an emission spectrum of the light emitting device by 30 nm or less. The light emitting device emits light with chromaticity that is within a four-sided region on a CIE 1931 chromaticity diagram, where chromaticity coordinates (x, y) are (0.645, 0.335) at a first point, (0.665, 0.335) at a second point, (0.735, 0.265) at a third point, (0.721, 0.259) at a fourth point, and a first line joins the first and second points, a second line joins the second and third points, a third line joins the third and fourth points, and a fourth line joins the fourth and first points to define the four-sided region of the chromaticity diagram.

Growing community of inventors

Anan, Japan

Makiko Iwasa