Semiconductor light-emitting device

• US 8,294,165 B2
• Filed: 01/29/2007
• Issued: 10/23/2012
• Est. Priority Date: 03/30/2006
• Status: Active Grant

• Current Assignee: Seoul Semiconductor Co., Ltd.
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Hattori, Yasushi, Nunoue, Shinya, Hatakoshi, Genichi, Saito, Shinji, Shida, Naomi, Yamamoto, Masahiro
• Primary Examiner(s): Such, Matthew W
• Assistant Examiner(s): WARD, ERIC A
• Application Number:
  US11/668,218
• Publication Number:
  US 20070228390A1
• Time in Patent Office: 2,094 Days
• Field of Search: 257 79-103, 257/E33.059, 257/E33.061, 438 22- 47, 313498-512
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/45015 being circular
• CPC Class Codes: H01L 2224/45139 Silver (Ag) as principal constituent
• CPC Class Codes: H01L 2224/45144 Gold (Au) as principal constituent
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00011 Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• 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 2924/01021 Scandium [Sc]
• CPC Class Codes: H01L 2924/01049 Indium [In]
• CPC Class Codes: H01L 2924/01066 Dysprosium [Dy]
• CPC Class Codes: H01L 2924/09701 Low temperature co-fired ceramic [LTCC]
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 2924/207 Diameter ranges
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin

Abstract

A light-emitting device is provided, which includes a substrate having a plane surface, a semiconductor light-emitting element mounted on the plane surface of the substrate and which emits light in a range from ultraviolet ray to visible light, a first light transmissible layer formed above the substrate and covering the semiconductor light-emitting element, a phosphor layer formed above the first light transmissible layer and containing phosphor particles and matrix, and a second light transmissible layer formed above the phosphor layer and contacting with the plane surface of the substrate. The surface of the phosphor layer has projections reflecting shapes of the phosphor particles.

Claims

1. A light-emitting device comprising:

a substrate having a plane surface;

a semiconductor light-emitting element mounted on the plane surface of the substrate and which emits light in a range from ultraviolet ray to visible light;

laminated structure which covers the semiconductor light-emitting element and contacts the plane surface of the substrate, the structure having a radius R1 and a height R2, where R1 and R2 satisfy ½

(R1)<

R2<

2R1, the laminated structure comprising;

a first light transmissible layer;

a phosphor layer which covers the first light transmissible layer, the phosphor layer contacting with the plane surface of the substrate and containing phosphor particles and matrix, a surface of the phosphor layer having unevenness reflecting shapes of the phosphor particles, the phosphor particles having a diameter ranging from 45 μ

m to 70 μ

m; and

a second light transmissible layer which covers the phosphor layer and contacting with the plane surface of the substrate,

wherein the phosphor particles are contained in the phosphor layer at a concentration of 20 wt % or more.

2. The light-emitting device according to claim 1, wherein the phosphor layer has a cross-section perpendicular to the plane surface of the substrate, a shape of an inner periphery of the cross-section being either semi-arc-shaped, parabola-shaped, or U-shaped, or cornered-shaped having at least two straight lines.

3. The light-emitting device according to claim 1, wherein the first light transmissible layer has a cross-section perpendicular to the plane surface of the substrate, a shape of an outer periphery of the cross-section being either semi-arc-shaped, parabola-shaped, or U-shaped, or cornered-shaped having at least two straight lines.

4. The light-emitting device according to claim 1, wherein the second light transmissible layer has a cross-section perpendicular to the plane surface of the substrate, a shape of an outer periphery of the cross-section being either semi-arc-shaped, parabola-shaped, or U-shaped, or cornered-shaped having at least two straight lines.

5. The light-emitting device according to claim 1, further comprising at least one another phosphor layer adjacent to the phosphor layer or inside of the first light transmissible layer or outside of the second light transmissible layer, the phosphor particles contained in respective phosphor layers being different in at least one of kind and concentration.

6. The light-emitting device according to claim 1, further comprising a third light transmissible layer above the second light transmissible layer, a refractive index of the third light transmissible layer being different from that of the second light transmissible layer.

7. The light-emitting device according to claim 1, further comprising at least one another phosphor layer between the first and second light transmissible layers, and a third light transmissible layer being sandwiched between adjacent phosphor layers.

8. The light-emitting device according to claim 1, wherein an edge of the second light transmissible layer coincides with an outline of the substrate.

9. The light-emitting device according to claim 1, wherein the unevenness occurs at a top part of the phosphor layer.

10. The light-emitting device according to claim 1, wherein the matrix is a resin.

11. The light-emitting device according to claim 10, wherein a reduced trailing of the resin occurs in a trailing part of the phosphor layer.

12. The light-emitting device according to claim 1, wherein the second light transmissible layer is in contact with air.