Light-emitting diode
A light-emitting diode (LED) includes a first type semiconductor layer, a second type semiconductor layer, a current controlling structure, a first electrode, and a second electrode. The second type semiconductor layer is joined with the first type semiconductor layer. The current controlling structure is joined with the first type semiconductor layer, and the current controlling structure has at least one current-injecting zone therein. The first electrode is electrically coupled with the first type semiconductor layer through the current-injecting zone of the current controlling structure. The second electrode is electrically coupled with the second type semiconductor layer.
1. A light-emitting diode (LED), comprising:
a first type semiconductor layer;
a second type semiconductor layer joined with the first type semiconductor layer; and
a current controlling structure joined with the first type semiconductor layer, the current controlling structure having at least one current-injecting zone therein, wherein the current controlling structure comprises:
at least one inactivated portion in the first type semiconductor layer, the inactivated portion defining the current-injecting zone;
wherein the first type semiconductor layer comprises:
at least one activated portion in the current-injecting zone, the activated portion having a resistivity less than that of the inactivated portion;
a first electrode electrically coupled with the first type semiconductor layer through the current-injecting zone of the current controlling structure; and
a second electrode electrically coupled with the second type semiconductor layer.
2. The LED of claim 1 , wherein the inactivated portion extends to a surface of the first type semiconductor layer facing the second type semiconductor layer.
3. The LED of claim 1 , wherein at least a part of the first type semiconductor layer which has a resistivity smaller than that of the inactivated portion is present between the inactivated portion and the second type semiconductor layer.
4. The LED of claim 2 , wherein the part of the first type semiconductor layer which is present between the inactivated portion and the second type semiconductor layer has the resistivity greater than that of the activated portion.
5. The LED of claim 1 , wherein a surface of the inactivated portion and a surface of the activated portion facing the first electrode are coplanar.
6. The LED of claim 1 , wherein the current-injecting zone is a conductive channel extending from a surface of the first type semiconductor layer facing the first electrode toward a surface of the first type semiconductor layer facing away from the first electrode toward.
7. The LED of claim 1 , wherein the first type semiconductor layer has a resistivity, the resistivity of the first type semiconductor layer has a minimum value at a position within the current-injecting zone, and the resistivity of the first type semiconductor layer at an edge portion of the current-injecting zone is gradually decreased from the outside of the current-injecting zone to the inside of the current-injecting zone.
8. The LED of claim 1 , wherein
the activated portion has a nitrogen vacancy density less than that of the inactivated portion.
9. The LED of claim 1 , wherein
the activated portion has a carrier concentration more than that of the inactivated portion.
10. The LED of claim 9 , wherein at least one of the carrier concentration is one of a hole concentration and an electron concentration.
11. The LED of claim 9 , wherein carrier concentration of the inactivated portion is gradually increased along a direction from an interface between the current controlling structure and the first electrode to the second type semiconductor layer.
12. The LED of claim 1 , wherein the first type semiconductor layer and the current controlling structure are p type semiconductor layers with different resistivities, and the second type semiconductor layer is an n type semiconductor layer.
13. The LED of claim 1 , wherein the current controlling structure comprises at least one current controlling layer, and the current controlling layer has at least one opening to form the current-injecting zone.
14. The LED of claim 1 , wherein the current controlling structure further comprises:
at least one current controlling layer having at least one opening, wherein a vertical projection of the opening on the inactivated portion at least partially overlaps with the current-injecting zone, and
the activated portion has a carrier concentration more than that of the inactivated portion.
15. The LED of claim 14 , wherein the current controlling layer is present on surfaces of the inactivated portion and the activated portion facing away from the second type semiconductor layer, and the first electrode is electrically coupled with the first type semiconductor layer through the opening and the current-injecting zone.
16. The LED of claim 14 , further comprising:
an active layer disposed between the first type semiconductor layer and the second type semiconductor layer, wherein the current controlling layer is present between the inactivated portion and the active layer.
17. The LED of claim 14 , wherein the current controlling layer is present on a surface of the second type semiconductor layer facing away from the first type semiconductor layer, and the second electrode is electrically coupled with the second type semiconductor layer through the opening.
18. The LED of claim 14 , further comprising:
an active layer disposed between the first type semiconductor layer and the second type semiconductor layer, wherein the current controlling layer is present between the second type semiconductor layer and the active layer.