Light emitting device and method for manufacturing the same

• US 10,629,789 B2
• Filed: 02/28/2018
• Issued: 04/21/2020
• Est. Priority Date: 05/26/2015
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Suzuki, Ryo
• Primary Examiner(s): Tran, Tan N
• Application Number:
  US15/908,577
• Publication Number:
  US 20180190886A1
• Time in Patent Office: 783 Days
• Field of Search: 257 98, 257 99, 257100
• CPC Class Codes: H01L 2933/0033 relating to semiconductor body packages
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 2933/0058 relating to optical field-shaping elements
• CPC Class Codes: H01L 33/0095 Post-treatment of devices, e.g. annealing, recrystallisation or short-circuit elimination
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

A light emitting device includes a light emitting element having a first face positioned on an emission face side of the light emitting device, a second face opposing the first face, and lateral faces disposed between the first face and the second face, a light transmissive member formed from a resin-containing material, covering at least a portion of the lateral faces of the light emitting element and having a first face positioned on the emission face side, a covering member covering an exterior of the light transmissive member and having a first face positioned on the emission face side, a wavelength converting member covering the first face of the light emitting element, the first face of the light transmissive member, and the first face of the covering member, and a light reflective film including a first reflective film portion made of an inorganic material disposed between the exterior of the light transmissive member and the covering member, and a second reflective film portion made of an inorganic material disposed between the first face of the covering member and the wavelength converting member.

Claims

1. A light emitting device comprising:

a light emitting element having a first face positioned on an emission face side of the light emitting device, a second face opposing the first face, and lateral faces disposed between the first face and the second face, the light emitting element comprising a pair of electrodes on the second face, each of the electrodes having a face that is in contact with the second face to electrically connect with the second face;

a light transmissive member formed from a resin-containing material, covering at least a portion of the lateral faces of the light emitting element;

a wavelength converting member covering the first face of the light emitting element;

a first covering member covering lateral faces of the wavelength converting member;

a second covering member covering an exterior of the light transmissive member, the second covering member being separated from the wavelength converting member; and

a light reflective film that is in contact with an inner surface of the second covering member, and that is in direct contact with lateral surfaces of the pair of electrodes at locations inward of the lateral faces of the light emitting element;

wherein the first covering member is disposed above the second covering member such that a lowermost surface of the first covering member faces an uppermost surface of the second covering member; and

wherein a portion of the light transmissive member directly contacts a lower surface of the wavelength converting member.

2. The light emitting device according to claim 1, wherein:

the second covering member has an upper surface positioned lower than the first face of the light emitting element.

3. The light emitting device according to claim 1, wherein:

an outer surface of the first covering member is flush with an outer surface of the second covering member.

4. The light emitting device according to claim 1, wherein:

a thickness of the first covering member is the same as a thickness of the wavelength converting member.

5. The light emitting device according to claim 1, wherein:

the inner surface of the second covering member comprises a tilted surface, and

a portion of the wavelength converting member is positioned on the tilted surface through the light transmissive member.

6. The light emitting device according to claim 1, wherein:

the light reflective film is in contact with the wavelength converting member.

7. The light emitting device according to claim 1, wherein:

a portion of the light reflective film is positioned lower than the light emitting element.

8. The light emitting device according to claim 1, wherein:

the light transmissive member is disposed between the first face of the light emitting element and the wavelength converting member.

9. The light emitting device according to claim 1, wherein:

the light reflective film is made of an inorganic material.

10. The light emitting device according to claim 1, wherein:

the light reflective film is made of an insulating material.

11. The light emitting device according to claim 1, wherein:

the light reflective film is made of an metal material.

12. The light emitting device according to claim 1, wherein:

the light reflective film includes a titanium oxide.

13. The light emitting device according to claim 1, wherein:

the light reflective film is in contact with the second face of the light emitting element.

14. The light emitting device according to claim 1, wherein:

the light reflective film is in contact with a portion of the second face of the light emitting element that is located between the electrodes.

15. The light emitting device according to claim 1, wherein:

a first portion of the light reflective film is located between the inner surface of the second covering member and an outer surface of the light transmissive member, and a second portion of the light reflective film is located between the inner surface of the second covering member and the lateral surfaces of the pair of electrodes, and

the light reflective film is continuous and has a substantially constant thickness from the first portion that is located between the inner surface of the second covering member and the outer surface of the light transmissive member to the second portion that is located between the inner surface of the second covering member and the lateral surfaces of the pair of electrodes.