Light-emitting diode element and light-emitting diode device
View Patent ↗Disclosed is a light-emitting diode element including a first semiconductor layer of a first conductivity type, a second semiconductor layer of a second conductivity type, an active layer. A first electrode is provided on a surface of the second semiconductor layer. A second electrode is provided in a second region of the principal surface of the first semiconductor layer. A conductive layer is arranged such that the conductive layer covers a third region, a fourth region, and a fifth region in the rear surface of the first semiconductor layer. In the rear surface of the first semiconductor layer, the first semiconductor layer includes a sixth region which is not covered with the conductive layer and which overlaps another part of the first electrode. The first semiconductor layer is not provided with a through electrode.
1. A light-emitting diode element, comprising:
a first semiconductor layer of a first conductivity type which has a principal surface and a rear surface;
a second semiconductor layer of a second conductivity type which is provided in a first region of the principal surface of the first semiconductor layer;
an active layer interposed between the first semiconductor layer and the second semiconductor layer;
a first electrode provided on a surface of the second semiconductor layer;
the first semiconductor layer is formed on the active layer;
a second electrode provided in a second region of the principal surface of the first semiconductor layer; and
a conductive layer that is arranged such that, in the rear surface of the first semiconductor layer, when viewed from a direction perpendicular to the rear surface, the conductive layer covers a third region lying between the first electrode and the second electrode, a fourth region which is adjacent to the third region and which overlaps at least part of the second electrode, and a fifth region which is adjacent to the third region and which overlaps part of the first electrode,
wherein the conductive layer is in contact with the first semiconductor layer,
the first semiconductor layer includes, in the rear surface of the first semiconductor layer, a sixth region which is not covered with the conductive layer and which overlaps another part of the first electrode when viewed from a direction perpendicular to the rear surface, and
the first semiconductor layer of the first conductivity type is not provided with an electrode penetrating between the principal surface and the rear surface.
2. The light-emitting diode element of claim 1 , wherein
the conductive layer is formed of a metal, and
the following relationship is satisfied:
0.050
≤
a
5
a
5
+
a
6
≤
0.250
where a5 is a width of the fifth region, and a6 is a width of the sixth region.
3. The light-emitting diode element of claim 1 , wherein
the conductive layer is formed of a conductive transparent material, and
the following relationship is satisfied:
0.125
≤
a
5
a
5
+
a
6
≤
0.750
where a5 is a width of the fifth region, and a6 is a width of the sixth region.
4. The light-emitting diode element of claim 1 , wherein a thickness of the first semiconductor layer of the first conductivity type is not more than 20 μm.
5. The light-emitting diode element of claim 1 , wherein a maximum thickness of the conductive layer is not less than 4 μm and not more than 100 μm.
6. The light-emitting diode element of claim 1 , wherein the first semiconductor layer has an uneven structure provided in the sixth region of the rear surface.
7. The light-emitting diode element of claim 1 , wherein the conductive layer has an uneven structure on a front surface thereof.
8. The light-emitting diode element of claim 1 , wherein the first semiconductor layer includes
an epitaxial growth layer of a first conductivity type provided on the active layer side, and
a semiconductor substrate of a first conductivity type provided on the conductive layer side.
9. The light-emitting diode element of claim 8 , wherein an average value of a total thickness of the semiconductor substrate and the conductive layer in the third, fourth, and fifth regions is greater than an average value of a thickness of the semiconductor substrate in the sixth region.
10. The light-emitting diode element of claim 8 , wherein a minimum value of a total thickness of the semiconductor substrate and the conductive layer in the third, fourth, and fifth regions is greater than a minimum value of a thickness of the semiconductor substrate in the sixth region.
11. The light-emitting diode element of claim 1 , wherein when viewed from the rear surface of the first semiconductor layer, the fourth region accords to the second electrode.
12. The light-emitting diode element of claim 1 , wherein the first semiconductor layer, the second semiconductor layer, and the active layer are formed of a GaN-based non-polar or semi-polar semiconductor.
13. The light-emitting diode element of claim 1 , wherein the first conductivity type is n-type.
14. A light-emitting diode device, comprising:
a mounting base which has a mounting surface and which includes a first terminal and a second terminal provided on the mounting surface; and
the light-emitting diode element as set forth in claim 1 , wherein
the first electrode and the second electrode are arranged so as to be electrically connected to the first terminal and the second terminal, respectively.