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Light-emitting device and method of manufacturing the same

專利號
US11996504B2
公開日期
2024-05-28
申請人
NICHIA CORPORATION(JP Anan)
發(fā)明人
Shoichi Kashihara; Masanobu Sato; Toshimasa Amiya
IPC分類
H01L33/00; H01L25/075; H01L33/48; H01L33/50; H01L33/54; H01L33/56; H01L33/30; H01L33/62; H01L33/64
技術(shù)領(lǐng)域
light,diffusing,emitting,member,agent,resin,in,silicone,phosphor,surface
地域: Anan

摘要

A light-emitting device 100 includes: a light-emitting element; a light-transmissive member covering the light-emitting element; and a light-diffusing agent contained in the light-transmissive member and comprising hollow particles. The light-transmissive member has a first surface having irregularities according to the light-diffusing agent. The first surface of the light-transmissive member has a convex shape with a height gradually increased from a peripheral portion of the first surface toward a central portion of the first surface.

說明書

The phosphor 5 is adapted to absorb light emitted from the light-emitting element 1 and convert the light into light with a different wavelength. Examples of the phosphor 5 include cerium-activated yttrium-aluminum-garnet (YAG)-based phosphors; cerium-activated lutetium-aluminum-garnet (LAG)-based phosphors; europium- and/or chromium-activated nitrogen-containing calcium aluminosilicate (CaO—Al2O3—SiO2)-based phosphors; europium-activated silicate ((Sr, Ba)2SiO4)-based phosphors; nitride-based phosphors such as β-SiAlON phosphors, CaAlSiN3:Eu (CASN)-based phosphors, and (Sr, Ca)AlSiN3:Eu (SCASN) phosphors; K2SiF6:Mn (KSF) phosphors; and sulfide-based phosphors. With such a phosphor, a light-emitting device that emits mixed light (such as white light) of primary light and secondary light, each having a wavelength of visible light, or a light-emitting device that emits visible secondary light through excitation by ultraviolet primary light can be provided. A plurality of types of phosphors 5 may be used in combination. Color rendering properties and color reproducibility can be adjusted by employing a combination or mixing ratio suitable to a desired color tone. The density of the phosphor 5 at the light-emitting element 1 side in the light-transmissive member 3 is preferably higher than the density of the phosphor 5 at the first surface side of the light-transmissive member 3 in the light-transmissive member 3. Increasing the density of the phosphor 5 at the light-emitting element 1 side allows for increasing the wavelength conversion ratio and reducing the addition amount of the phosphor 5 required to achieve a desired chromaticity.

權(quán)利要求

1
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