Light emitting device

• US 9,818,731 B2
• Filed: 04/14/2015
• Issued: 11/14/2017
• Est. Priority Date: 05/30/2014
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Nada, Tomokazu, Kondoh, Masaki, Koizumi, Hideshi, Hata, Toshio
• Primary Examiner(s): Blum, David S
• Application Number:
  US15/307,597
• Publication Number:
  US 20170047311A1
• Time in Patent Office: 945 Days
• Field of Search: 257 89
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/49113 the connectors connecting different bonding areas on the semiconductor or solid-state body to a common bonding area outside the body, e.g. converging wires
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

The color purities of blue-green light and yellow or yellow-green light are enhanced. A light emitting device (100) configured to emit at least blue-green light and yellow or yellow-green light includes a substrate (51), an LED chip group, and a sealing resin part (50) collectively sealing the LED chip group, wherein the LED chip group at least includes a green LED chip (GB), a green LED chip (GY), a blue LED chip (B), and a red LED chip (R), and the green LED chip (GB) has a dominant wavelength shorter than a dominant wavelength of the green LED chip (GY).

Claims

1. A light emitting device configured to emit at least blue-green light and yellow or yellow-green light, the light emitting device comprising:

a substrate;

an LED chip group disposed on a main surface side of the substrate and including a plurality of LED chips; and

a sealing part collectively sealing the LED chip group, wherein

the LED chip group includes

at least two green LED chips including a first green LED chip and a second green LED chip,

at least one blue LED chip, and

at least one red LED chip,

the first green LED chip has a dominant wavelength shorter than a dominant wavelength of the second green LED chip,

the first green LED chip is disposed adjacently to at least one of the at least one blue LED chip,

the second green LED chip is disposed adjacently to at least one of the at least one red LED chip, and

when a vertical direction and a horizontal direction orthogonal to each other in a top view of the light emitting device are defined,

(A) the first green LED chip and the second green LED chip substantially align with each other along a same horizontal direction, and the blue LED chip and the red LED chip substantially align with each other along a same horizontal direction, or

(B) the red LED chip and a first one of the first green LED chip and the second green LED chip substantially align with each other along a same horizontal direction, and a second one of the first green LED chip and the second green LED chip and the blue LED chip substantially align with each other along a same horizontal direction.

2. The light emitting device according to claim 1, wherein the dominant wavelength of the first green LED chip is greater than or equal to 480 nm and less than or equal to 520 nm, and the dominant wavelength of the second green LED chip is greater than or equal to 520 nm and less than or equal to 560 nm.

3. The light emitting device according to claim 1, wherein a dominant wavelength of one of the green LED chips which has a dominant wavelength which is longest is longer than a dominant wavelength of each of the other green LED chips by 20 nm or greater.

4. The light emitting device according to claim 1, wherein regarding xy chromaticity coordinates of a CIE chromaticity diagram, a difference between an x value of one of the green LED chips which has a dominant wavelength which is longest and an x value of each of the other green LED chips is greater than or equal to 0.06.

5. The light emitting device according to claim 1, wherein each LED chip of the LED chip group is independently driven.