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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

Accordingly, the light-emitting device in which the light-diffusing agent is added to the light-transmissive member and the light-emitting device in which no light-diffusing agent is added to the light-transmissive member have the same emission color even though having different colors of external appearance. In other words, the hollow structure of the light-diffusing agent located above the phosphor, which is present at the bottom surface of the light-transmissive member, can scatter extraneous light.

The difference in height of a surface of the light-emitting device was 0 μm in Comparative Example 1, while irregularities were observed in Example 1 to Example 5. In other words, adding the light-diffusing agent with a particle size in the range of 20 μm to 70 μm allows for forming irregularities according to the light-diffusing agent on the first surface of the light-transmissive member. The irregularities can efficiently scatter extraneous light and light emitted from the light-emitting devices incident on a surface of the light-emitting device and suppress glare.

In the light-emitting device of Comparative Example 1 in which no light-diffusing agent was added to the light-transmissive member, when the light-emitting device was turned on, the difference in brightness between the light-emitting portions, which included the light-emitting elements, and the non-light-emitting portions, which included no light-emitting element, was conspicuous.

權(quán)利要求

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