Light emitting device

1. A light emitting device, comprising:

a first light emitting unit comprising a first composite layer, and the first composite layer comprising an organic light emitting layer; and

a second light emitting unit adjacent to the first light emitting unit, comprising a second composite layer, and the second composite layer comprising a quantum dot light emitting layer;

wherein a thickness of the first composite layer is less than a thickness of the second composite layer.

2. The light emitting device of claim 1 , wherein a ratio of the thickness of the first composite layer to the thickness of the second composite layer is greater than or equal to 0.1 and less than 1.

3. The light emitting device of claim 1 , wherein the organic light emitting layer and the quantum dot light emitting layer are manufactured in different processes.

4. The light emitting device of claim 1 , wherein the first light emitting unit further comprises a first anode and a first cathode respectively electrically connected to the first composite layer, and the second light emitting unit further comprises a second anode and a second cathode respectively electrically connected to the second composite layer.

5. The light emitting device of claim 4 , wherein the first anode and the second anode are manufactured in a same process.

6. The light emitting device of claim 4 , wherein the first cathode and the second cathode are manufactured in a same process.

7. The light emitting device of claim 4 , further comprising a pixel defining layer, wherein the first anode or the second anode contacts with at least a part of a side surface of the pixel defining layer.

8. The light emitting device of claim 1 , wherein the organic light emitting layer comprises a plurality of sub-layers having different thicknesses.

9. The light emitting device of claim 1 , wherein the quantum dot light emitting layer comprises a plurality of sub-layers having different thicknesses.

10. The light emitting device of claim 1 , wherein the organic light emitting layer or the quantum dot light emitting layer comprises a first sub-layer, a second sub-layer, and a third sub-layer, the second sub-layer is disposed between the first sub-layer and the third sub-layer, and a thickness of the second sub-layer is less than a thickness of the first sub-layer or a thickness of the third sub-layer.

11. The light emitting device of claim 1 , wherein a light emitted by the organic light emitting layer and a light emitted by the quantum dot light emitting layer have different colors.

12. The light emitting device of claim 1 , further comprising a pixel defining layer, wherein the first composite layer or the second composite layer is disposed in an aperture of the pixel defining layer, and the first composite layer or the second composite layer covers at least a part of a side surface of the pixel defining layer and a portion of a top surface of the pixel defining layer.

13. The light emitting device of claim 1 , further comprising a pixel defining layer and a spacer formed on the pixel defining layer, wherein the spacer is not overlapped with an aperture of the pixel defining layer.

14. The light emitting device of claim 1 , wherein an area of the first light emitting unit is different from an area of the second light emitting unit.

15. The light emitting device of claim 1 , wherein the first composite layer and the second composite layer respectively comprise an electron injection layer or an electron transporting layer, and the electron injection layer of the first composite layer and the electron injection layer of the second composite layer are separated, or the electron transporting layer of the first composite layer and the electron transporting layer of the second composite layer are separated,

wherein the first composite layer and the second composite layer respectively comprise a hole injection layer or a hole transporting layer, and the hole injection layer of the first composite layer and the hole injection layer of the second composite layer are separated, or the hole transporting layer of the first composite layer and the hole transporting layer of the second composite layer are separated.

16. A light emitting device, comprising:

a first light emitting unit comprising a first composite layer, and the first composite layer comprising an organic light emitting layer;

a second light emitting unit adjacent to the first light emitting unit, the second light emitting unit comprising a second composite layer, and the second composite layer comprising a quantum dot light emitting layer;

a pixel defining layer; and

a spacer disposed on the pixel defining layer and having a curved profile,

wherein a thickness of the organic light emitting layer is less than a thickness of the quantum dot light emitting layer.

17. The light emitting device of claim 16 , wherein a ratio of the thickness of the organic light emitting layer to the thickness of the quantum dot light emitting layer is greater than or equal to 0.1 and less than 1.