OLED device, method for manufacturing the same, and display apparatus

1. An OLED device, comprising:

an anode;

a cathode;

at least two organic light emitting layers between the anode and the cathode;

a charge generation layer between two adjacent organic light emitting layers in the at least two organic light emitting layers,

wherein at least one of two surfaces of the charge generation layer adjacent to the two adjacent organic light emitting layers is provided with microstructures, and

wherein the microstructures comprise recessed structures extending away from the anode, and the microstructures have a profile in a shape of semicircle or arc in a cross section perpendicular to the organic light emitting layers.

2. The OLED device according to claim 1 , wherein the microstructures comprise protruding structures extending away from the anode, and the microstructures have a profile in a shape of semicircle or arc in a cross section perpendicular to the organic light emitting layers.

3. The OLED device according to claim 2 , wherein the microstructures are in a shape of a hemisphere, a semi-ellipsoid, a hexahedron, a cylinder, a cone, a prism, a pyramid, a truncated cone or a truncated prism.

4. The OLED device according to claim 1 , wherein the microstructures are plural and the plurality of microstructures are arranged in an array.

5. The OLED device according to claim 1 , wherein the at least two organic light emitting layers comprise a first organic light emitting layer and a second organic light emitting layer, the first organic light emitting layer being disposed between the anode and the charge generation layer, and the second organic light emitting layer being disposed between the charge generation layer and the cathode, and

wherein the first organic light emitting layer comprises: a first hole injection layer, a first hole transport layer, a first light emitting layer, a first electron transport layer, and a first electron injection layer which are sequentially laminated on the anode, and the second organic light emitting layer comprises a second hole injection layer, a second hole transport layer, a second light emitting layer, a second electron transport layer, and a second electron injection layer which are sequentially laminated on the charge generation layer.

6. The OLED device according to claim 1 , wherein the OLED device is a top emission type light emitting device.

7. The OLED device according to claim 1 , further comprising a base substrate disposed on a surface of the anode away from the charge generation layer.

8. The OLED device according to claim 7 , wherein the base substrate is a glass substrate or a flexible substrate.

9. A method for manufacturing the OLED device according to claim 1 , comprising:

forming a structure in which one of the at least two organic light emitting layers, the charge generation layer, and another of the at least two organic light emitting layers are sequentially laminated,

wherein the forming a structure in which one of the at least two organic light emitting layers, the charge generation layer, and another of the at least two organic light emitting layers are sequentially laminated comprises forming the microstructures on the at least one of two surfaces of the charge generation layer adjacent to the two adjacent organic light emitting layers, and

wherein the forming the microstructure on the at least one of two surfaces of the charge generation layer adjacent to the two adjacent organic light emitting layers comprises:

forming the microstructure on a surface of the charge generation layer adjacent to the anode, the microstructures being recessed toward a direction away from the anode.

10. The method according to claim 9 , wherein the forming the microstructures on the at least one of two surfaces of the charge generation layer adjacent to the two adjacent organic light emitting layers comprises:

forming the microstructures on a surface of the charge generation layer away from the anode, the microstructures protruding toward a direction away from the anode.

11. The method according to claim 9 , further comprising: forming the anode; and forming the cathode,

wherein the forming a structure in which one of the at least two organic light emitting layers, the charge generation layer, and another of the at least two organic light emitting layers are sequentially laminated comprises:

sequentially forming a first hole injection layer, a first hole transport layer, a first light emitting layer, a first electron transport layer, and a first electron injection layer that are laminated on the anode;

forming the charge generation layer on the first electron injection layer;

sequentially forming a second hole injection layer, a second hole transport layer, a second light emitting layer, a second electron transport layer, and a second electron injection layer that are laminated on the charge generation layer.

12. The method according to claim 11 , wherein, before the forming the anode, the method further comprises forming a base substrate,

wherein the anode is disposed on the base substrate.

13. The method according to claim 12 , wherein the base substrate is a glass substrate or a flexible substrate.

14. The method according to claim 9 , wherein, before the forming the microstructures on a surface of the charge generation layer adjacent to the anode, the method comprises: forming protruded microstructures on a surface of the organic light emitting layer between the anode and the charge generation layer away from the anode.

15. The method according to claim 9 , wherein the microstructures are formed by using an evaporation, sputtering or plasma deposition process.

16. A display apparatus, comprising the OLED device according to claim 1 .

17. The OLED device according to claim 1 , wherein the microstructures are uniformly distributed.

18. The OLED device according to claim 1 , wherein a surface of the charge generation layer is provided with protrusions and a surface of one of the organic light emitting layers adjacent to the charge generation layer is provided with recesses; or

a surface of the charge generation layer is provided with recesses and a surface of one of the organic light emitting layers adjacent to the charge generation layer is provided with protrusions.