Granted Patent B2

US 12,379,528 · App. 17/782,775 · Granted Aug 5, 2025

Inventors: Qingyu Huang (Beijing, CN); Wenqi Liu (Beijing, CN); Fudong Chen (Beijing, CN); Zhiqiang Jiao (Beijing, CN)

Assignee: BOE Technology Group Co., Ltd.

G02B5/008H10K50/82H10K50/844H10K50/8445H10K50/85H10K59/8731H10K59/879H10K71/00H10K2102/00H10K2102/3026H10K2102/351

Abstract

Claims (198)

1. An encapsulation structure, applicable for encapsulating an electroluminescent device, the encapsulation structure comprising:

a first inorganic dielectric layer provided with a surface for being attached to a surface of a cathode layer of the electroluminescent device;

wherein a dispersion relation among the first inorganic dielectric layer, the cathode layer and an electron injection layer of the electroluminescent device satisfies a preset condition, wherein the preset condition is configured to define an optical parameter of a first interface, the optical parameter is related to dispersion and is configured to couple surface plasmon polaritons (SPPs) on interfaces of two sides of the cathode layer, and the first interface is an interface between the first inorganic dielectric layer and the cathode layer.

2. The encapsulation structure according to claim 1 , wherein the preset condition satisfies the following formula:

e

-

4

⁢

k

1

⁢

a

=

k

1

ε

1

+

k

2

ε

2

k

1

ε

1

-

k

2

ε

2

×

k

1

ε

1

+

k

3

ε

3

k

1

ε

1

-

k

3

ε

3

,

in which,

k 1 represents a wave vector of light in the cathode layer, in nm −1 ;

k 2 represents a wave vector of light in the electron injection layer of the electroluminescent device, in nm −1 ;

k 3 represents a wave vector of light in the first inorganic dielectric layer, in nm −1 ;

ε 1 represents a dielectric constant of light in the cathode layer, in C 2 /(N·M 2 );

ε 2 represents a dielectric constant of light in the electron injection layer of the electroluminescent device, in C 2 /(N·M 2 );

ε 3 represents a dielectric constant of light in the first inorganic dielectric layer, in C 2 /(N·M 2 );

a represents a thickness of the cathode layer, in nm; and

e represents the dispersion relation.

3. The encapsulation structure according to claim 1 , wherein a water vapor transmission rate of the first inorganic dielectric layer is not greater than 1×10 −4 g/m 2 d.

4. The encapsulation structure according to claim 1 , wherein the first inorganic dielectric layer is made from at least one of aluminium oxide, silicon oxide and silicon nitride.

5. The encapsulation structure according to claim 1 , wherein a thickness of the first inorganic dielectric layer ranges from 30 nm to 100 nm.

6. The encapsulation structure according to claim 5 , wherein the thickness of the first inorganic dielectric layer is 50 nm.

7. The encapsulation structure according to claim 1 , further comprising an organic encapsulation layer and a second inorganic dielectric layer, wherein the organic encapsulation layer is disposed between the first inorganic dielectric layer and the second inorganic dielectric layer, and the first inorganic dielectric layer is disposed between the organic encapsulation layer and the cathode layer.

8. The encapsulation structure according to claim 7 , wherein a thickness of the organic encapsulation layer ranges from 4 μm to 20 μm.

9. The encapsulation structure according to claim 7 , wherein a thickness of the second inorganic dielectric layer ranges from 50 nm to 2000 nm.

10. The encapsulation structure according to claim 7 , wherein the second inorganic dielectric layer is made from at least one of aluminium oxide, silicon oxide and silicon nitride.

11. The encapsulation structure according to claim 1 , wherein the first inorganic dielectric layer is manufactured through atomic layer deposition (ALD).

12. An encapsulation method, comprising:

forming a first inorganic dielectric layer on a surface of a cathode layer of an electroluminescent device;

wherein a dispersion relation among the first inorganic dielectric layer, the cathode layer and an electron injection layer of the electroluminescent device satisfies a preset condition, wherein the preset condition is configured to define an optical parameter of a first interface, the optical parameter is related to dispersion and is configured to couple surface plasmon polaritons (SPPs) on interfaces of two sides of the cathode layer, and the first interface is an interface between the first inorganic dielectric layer and the cathode layer.

13. The encapsulation method according to claim 12 , wherein the preset condition satisfies the following formula:

e

-

4

⁢

k

1

⁢

a

=

k

1

ε

1

+

k

2

ε

2

k

1

ε

1

-

k

2

ε

2

×

k

1

ε

1

+

k

3

ε

3

k

1

ε

1

-

k

3

ε

3

,

in which,

k 1 represents a wave vector of light in the cathode layer, in nm −1 ;

k 2 represents a wave vector of light in the electron injection layer of the electroluminescent device, in nm −1 ;

k 3 represents a wave vector of light in the first inorganic dielectric layer, in nm −1 ;

ε 1 represents a dielectric constant of light in the cathode layer, in C 2 /(N·M 2 );

ε 2 represents a dielectric constant of light in the electron injection layer of the electroluminescent device, in C 2 /(N·M 2 );

ε 3 represents a dielectric constant of light in the first inorganic dielectric layer, in C 2 /(N·M 2 );

a represents a thickness of the cathode layer, in nm; and

e represents the dispersion relation.

14. The encapsulation method according to claim 12 , wherein forming the first inorganic dielectric layer on the surface of the cathode layer of the electroluminescent device comprises:

forming the first inorganic dielectric layer on the surface of the cathode layer of the electroluminescent device through atomic layer deposition (ALD).

15. The encapsulation method according to claim 12 , further comprising:

sequentially forming an organic encapsulation layer and a second inorganic dielectric layer on the first inorganic dielectric layer.

16. An electroluminescent device, comprising the encapsulation structure and a cathode layer;

wherein a first inorganic dielectric layer of the encapsulation structure is attached to a surface of the cathode layer,

the encapsulation structure which is applicable for encapsulating the electroluminescent device comprises:

a first inorganic dielectric layer provided with a surface for being attached to a surface of the cathode layer of the electroluminescent device; wherein

a dispersion relation among the first inorganic dielectric layer, the cathode layer and an electron injection layer of the electroluminescent device satisfies a preset condition, wherein the preset condition is configured to define an optical parameter of a first interface, the optical parameter is related to dispersion and is configured to couple surface plasmon polaritons (SPPs) on interfaces of two sides of the cathode layer, and the first interface is an interface between the first inorganic dielectric layer and the cathode layer.

17. The electroluminescent device according to claim 16 , wherein the cathode layer is a metal layer.

18. The electroluminescent device according to claim 17 , wherein the cathode layer is at least one of an Ag layer, an Mg—Ag laminated layer, an Al—Ag laminated layer, a Cu—Ag laminated layer, and an Al layer.

19. The electroluminescent device according to claim 16 , wherein the preset condition satisfies the following formula:

e

-

4

⁢

k

1

⁢

a

=

k

1

ε

1

+

k

2

ε

2

k

1

ε

1

-

k

2

ε

2

×

k

1

ε

1

+

k

3

ε

3

k

1

ε

1

-

k

3

ε

3

,

in which,

k 1 represents a wave vector of light in the cathode layer, in nm −1 ;

k 2 represents a wave vector of light in an electron injection layer of the electroluminescent device, in nm −1 ;

k 3 represents a wave vector of light in the first inorganic dielectric layer, in nm −1 ;

ε 1 represents a dielectric constant of light in the cathode layer, in C 2 /(N·M 2 );

ε 2 represents a dielectric constant of light in the electron injection layer of the electroluminescent device, in C 2 /(N·M 2 );

ε 3 represents a dielectric constant of light in the first inorganic dielectric layer, in C 2 /(N·M 2 );

a represents a thickness of the cathode layer, in nm; and

e represents a dispersion relation.

20. A display device, comprising a power supply component and the electroluminescent device as defined in claim 16 , wherein the power supply component is configured to supply to the electroluminescent device.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (19)