Nichia Corporation

Masami Kumano

Masahiko Sano

Dai Wakamatsu

Makiko Iwasa

Yuji Sato

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

A method of manufacturing a wavelength conversion member with improved capability of releasing heat from a fluorescent material is provided. The method of manufacturing the wavelength conversion member includes: disposing a fluorescent material paste containing a fluorescent material and a binder on a surface of a light-transmissive body; orienting face-down the surface where the fluorescent material paste is disposed, to settle the fluorescent material in the fluorescent material paste on a side opposite to another side of the fluorescent material paste, the another side being in contact with the light-transmissive body; and curing the binder in a state where the fluorescent material has been settled, to form a fluorescent material layer.

Light emitting device using wavelength conversion member, method of manufacturing wavelength conversion member, and method of manufacturing light emitting device

An optical component includes a phosphor member, an optical filter arranged over the phosphor member at a light extraction side of the phosphor member, and a light scattering member arranged on over the optical filter. An excitation spectrum of the phosphor member has a first local maximum wavelength in the visible region and a second local maximum wavelength in the ultraviolet region. The optical filter is configured to reflect a portion of light at the first local maximum wavelength and a portion or all of light at the second local maximum wavelength.

Growing community of inventors

Tokushima, Japan

Masami Kumano