Light emitting device and display device including the same
A light emitting device, includes: a substrate; a light emitting element on the substrate, the light emitting element having a first end portion and a second end portion arranged in a longitudinal direction; one or more partition walls disposed on the substrate, the one or more partition walls being spaced apart from the light emitting element; a first reflection electrode adjacent the first end portion of the light emitting element; a second reflection electrode adjacent the second end portion of the light emitting element; a first contact electrode connected to the first reflection electrode and the first end portion of the light emitting element; an insulating layer on the first contact electrode, the insulating layer having an opening exposing the second end portion of the light emitting element and the second reflection electrode to the outside; and a second contact electrode on the insulating layer.
1. A light emitting device, comprising:
a substrate;
a first electrode and a second electrode on the substrate and spaced apart from each other;
a light emitting element on the first and second electrodes, the light emitting element having a first end portion and a second end portion facing each other arranged in a longitudinal direction;
one or more walls disposed on the substrate, the one or more walls being spaced apart from the light emitting element;
a first contact electrode directly connected to the first electrode and the first end portion of the light emitting element;
an insulating layer having an opening exposing the second end portion of the light emitting element and the second electrode to an outside, the insulating layer being disposed on the first contact electrode and entirely covering the first contact electrode; and
a second contact electrode connected to the second electrode and the second end portion of the light emitting element through the opening of the insulating layer.
2. The light emitting device of claim 1 , wherein:
any one of the first and second electrodes is on the one or more walls, and the first and second electrodes and the one or more walls comprise different materials.
3. The light emitting device of claim 2 , wherein the one or more walls include an insulating material and the first and second electrodes include a conductive material.
4. The light emitting device of claim 1 , wherein the light emitting element comprises:
a first semiconductor layer in which a first conductive dopant is doped;
a second semiconductor layer in which a second conductive dopant is doped; and
an active layer disposed between the first and second semiconductor layers.
5. The light emitting device of claim 1 , wherein any one of the first and second contact electrodes includes a conductive material, of which a work function is less than 4.1 eV, and the other of the first and second contact electrodes includes a conductive material, of which a work function is larger than 7.5 eV.
6. A light emitting device, comprising:
a substrate;
a first electrode and a second electrode on the substrate and spaced apart from each other;
a light emitting element on the first and second electrodes, the light emitting element having a first end portion and a second end portion facing each other arranged in a longitudinal direction;
a support member disposed between the substrate and at least a portion of the light emitting element;
one or more walls disposed on the substrate, the one or more walls being spaced apart from the light emitting element;
the first electrode adjacent the first end portion of the light emitting element;
the second electrode adjacent the second end portion of the light emitting element;
a first contact electrode directly connected to the first electrode and the first end portion of the light emitting element;
an insulating layer having an opening exposing the second end portion of the light emitting element and the second electrode to an outside, the insulating layer being disposed on the first contact electrode and entirely covering the first contact electrode; and
a second contact electrode connected to the second electrode and the second end portion of the light emitting element through the opening of the insulating layer.
7. The light emitting device of claim 6 , wherein the support member includes an insulating material.
8. The light emitting device of claim 7 , wherein:
the first end portion of the light emitting element faces the first electrode, the second end portion of the light emitting element faces the second electrode, and
a remaining portion between the first end portion and the second end portion of the light emitting element is on the support member.
9. A display device, comprising:
a substrate including at least one pixel area;
a pixel in the at least one pixel area and having one or more thin film transistors; and
a light emitting device on the one or more thin film transistors and connected to the one or more thin film transistors,
wherein the light emitting device comprises:
a first electrode and a second electrode on the substrate and spaced apart from each other;
a plurality of light emitting elements on the first and second electrodes, the plurality of light emitting elements each having a first end portion and a second end portion facing each other arranged along a longitudinal direction;
one or more walls spaced apart from each of the plurality of light emitting elements;
a support member disposed between the substrate and at least a portion of each of the light emitting elements;
the first electrode connected to the first end portion of each light emitting element;
the second electrode connected to the second end portion of each light emitting element;
a first contact electrode disposed on the first end portion of each light emitting element and the first electrode;
a first insulating layer disposed on the first contact electrode and entirely covering the first contact electrode; and
a second contact electrode disposed on the first insulating layer and provided in a layer different from the first contact electrode,
wherein any one of the first and second electrodes is electrically connected to the one or more thin film transistor.
10. The display device of claim 9 , wherein:
the first and second electrodes are on the one or more walls; and
the first and second electrodes and the one or more walls comprise different materials.
11. The display device of claim 10 , wherein the one or more walls include an insulating material and the first and second electrodes include a conductive material.
12. The display device of claim 9 , wherein each of the light emitting elements comprises:
a first semiconductor layer in which a first conductive dopant is doped;
a second semiconductor layer in which a second conductive dopant is doped; and
an active layer disposed between the first and second semiconductor layers.
13. The display device of claim 9 , wherein any one of the first and second contact electrodes includes a conductive material, of which a work function is less than 4.1 eV, and the other of the first and second contact electrodes includes a conductive material, of which a work function is larger than 7.5 eV.
14. The display device of claim 9 , wherein the support member includes an insulating material.
15. The display device of claim 14 , wherein:
the first end portion of each light emitting element faces the first electrode,
the second end portion of each light emitting element faces the second electrode, and
a remaining portion between the first end portion and the second end portion of each light emitting element is on the support member.
16. The display device of claim 9 , further comprising:
a second insulating layer disposed on each of the light emitting elements between the first contact electrode and the second contact electrode in a cross-sectional view,
wherein a first insulating layer is disposed on the second insulating layer.