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Light-emitting device and method of manufacturing the same

專利號(hào)
US11996504B2
公開日期
2024-05-28
申請(qǐng)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

CROSS-REFERENCE TO RELATED APPLICATION

This application is a Continuation of co-pending U.S. application Ser. No. 17/181,780, filed on Feb. 22, 2021, which is a Divisional of U.S. application Ser. No. 16/262,284, filed on Jan. 30, 2019 (now U.S. Pat. No. 10,964,859, issued on Mar. 30, 2021), which is based upon and claims the benefit of priority from Japanese Patent Application No. 2018-014328, filed on Jan. 31, 2018, the contents of which are hereby incorporated by reference in their entirety.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present disclosure relates to a light-emitting device and a method of manufacturing the same.

2. Description of Related Art

White light-emitting devices employing phosphors such as yellow phosphors and red phosphors are widely used in recent years, and various studies on improvement in the light extraction efficiency, reduction of unevenness in emission color, and the like have been conducted.

In Japanese Patent No. 4167717, which describes one example of such light emitting devices, a surface of a sealing resin has projecting portions to improve light extraction efficiency and luminance.

SUMMARY OF THE INVENTION

However, the color of the phosphor is visible through the light-emitting surface of the light-emitting device in Japanese Patent No. 4167717, and thus an emission color of the light emitting device is different from an object color of the light-emitting surface.

權(quán)利要求

1
What is claimed is:1. A method of manufacturing a light-emitting device, the method comprising:providing a first intermediate product including:a base member having a recess, anda light-emitting element placed on or above an inner bottom surface of the base member;injecting into the recess a resin including a light-diffusing agent that includes hollow particles to form a light-transmissive member in a convex shape with a thickness that gradually increases from a peripheral portion of the light-transmissive member toward a central portion of the light-transmissive member;allowing the hollow particles to float up to a first surface of the injected light-transmissive member and to gather in the central region of the light-transmissive member; andhardening the light-transmissive member to form the light-emitting device,wherein, in a plan view, the central portion of the first surface of the light-transmissive member has irregularities formed by the light-diffusing agent and a peripheral region including the outer peripheral portion of the first surface of the light-transmissive member is smooth without the irregularities formed by the light-diffusing agent.2. The method of manufacturing a light-emitting device according to claim 1,wherein the light-transmissive member further comprises a phosphor, andwherein, the light-transmissive member is formed so that the phosphor density at the light-emitting element side of the light-transmissive member is higher than the phosphor density at the first surface side of the light-transmissive member.3. The method of manufacturing a light-emitting device according to claim 1, wherein the hollow particles are allowed to float up so that at least a portion of the light-diffusing agent is exposed at the first surface of the light-transmissive member and/or the light-diffusing agent is covered with the light-transmissive member to form irregularities by the hollow particles on the first surface of the light-transmissive member.4. The method of manufacturing a light-emitting device according to claim 1, wherein the light-diffusing agent has a particle size in a range of 20 μm to 70 μm.5. The method of manufacturing a light-emitting device according to claim 1, wherein the light-diffusing agent has a bulk density relative to the light-transmissive member in a range of 0.1 g/cm3 to 0.7 g/cm3.6. The method of manufacturing a light-emitting device according to claim 1, wherein the hollow particles are allowed to float up so that the light-diffusing agent is located at the central region of the light-transmissive member in a plan view and the light-diffusing agent is not present at the peripheral portion of the light-transmissive member in a cross-sectional view.7. The method of manufacturing a light-emitting device according to claim 1, wherein the hollow particles have a spherical shape.8. The method of manufacturing a light-emitting device according to claim 1, wherein the light-emitting device comprises a plurality of the light-emitting elements.9. The method of manufacturing a light-emitting device according to claim 1, wherein a base material of the light-transmissive member comprises a silicone resin.
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