ORGANIC LIGHT-EMITTING STRUCTURE AND DISPLAY DEVICE

• US 20180358417A1
• Filed: 10/18/2017
• Published: 12/13/2018
• Est. Priority Date: 06/13/2017
• Status: Active Grant

• Current Assignee: Wuhan Tianma Micro-Electronics Company Limited (Wuhan Donghu New Technology Development Zone Production Promotion Centre), Wuhan Tianma Microelectronics Company Limited Shanghai Branch
• Original Assignee: Shanghai Tianma AM-OLED Co. Ltd (Tianma Microelectronics Company Limited)
• Inventors: HAMADA, Yuji
• Granted Patent: US 10,510,808 B2
• Time in Patent Office: Days
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/16 Electron transporting layers
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]

Abstract

An organic light-emitting structure is described. The organic light-emitting structure includes a first light-emitting unit, a second light-emitting unit, a third light-emitting unit, and a fourth light-emitting unit. Each of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit comprises a first electrode, a second electrode, and an organic laminated body placed between the first electrode and the second electrode. One of the first electrode and the second electrode is a translucent electrode. At least one light-emitting unit is a fluorescent light-emitting unit. The color gamut range of the organic light-emitting structure is increased, the color saturation of the light-emitting device is improved, and quantity of colors is increased, so that the development trend of color reproducibility for the display devices can be satisfied.

Claims

1. An organic light-emitting structure, comprising:

a first light-emitting unit,

a second light-emitting unit,

a third light-emitting unit, and

a fourth light-emitting unit,

wherein each of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit comprises a first electrode, a second electrode, and an organic laminated body placed between the first electrode and the second electrode;

one of the first electrode and the second electrode is a translucent electrode;

the organic laminated body comprises a light-emitting layer; and

at least one of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit is a fluorescent light-emitting unit.

2. The organic light-emitting structure according to claim 1, wherein the at least one of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit is the fluorescent light-emitting unit, and each of the rest of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit is a phosphorescent light-emitting unit.

3. The organic light-emitting structure according to claim 1, wherein an emission wavelength of the first light-emitting unit, an emission wavelength of the second light-emitting unit, an emission wavelength of the third light-emitting unit, and an emission wavelength of the fourth light-emitting unit successively increase.

4. The organic light-emitting structure according to claim 3, wherein the light-emitting layer of the first light-emitting layer is a first light-emitting layer, the light-emitting layer of the second light-emitting layer is a second light-emitting layer, the light-emitting layer of the third light-emitting layer is a third light-emitting layer, and the light-emitting layer of the fourth light-emitting layer is a fourth light-emitting layer;

and a thickness of the first light-emitting layer, a thickness of the second light-emitting layer, a thickness of the third light-emitting layer, and a thickness of the fourth light-emitting layer successively increase.

5. The organic light-emitting structure according to claim 3, wherein the organic laminated body further comprises a monochromic hole transmission layer stacked with the light-emitting layer, the light-emitting layer is closer to the translucent electrode than the monochromic hole transmission layer is;

the monochromic hole transmission layer of the first light-emitting unit is a first monochromic hole transmission layer, the monochromic hole transmission layer of the second light-emitting unit is a second monochromic hole transmission layer, the monochromic hole transmission layer of the third light-emitting unit is a third monochromic hole transmission layer, and the monochromic hole transmission layer of the fourth light-emitting unit is a fourth monochromic hole transmission layer; and

a thickness of the first monochromic hole transmission layer, a thickness of the second monochromic hole transmission layer, a thickness of the third monochromic hole transmission layer, and a thickness of the fourth monochromic hole transmission layer successively increase.

6. The organic light-emitting structure according to claim 5, wherein the organic laminated body further comprises a common hole transmission layer, the common hole transmission layer is stacked on one side of the monochromic hole transmission layer away from the light-emitting layer.

7. The organic light-emitting structure according to claim 1, wherein the first electrode is a non-transparent anode;

and the second electrode is a translucent cathode.

8. The organic light-emitting structure according to claim 7, wherein each of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit further comprises a reflection film, and the reflection film is placed on one side of the first electrode away from the organic laminated body.

9. The organic light-emitting structure according to claim 8, further comprising:

a substrate;

wherein the substrate, the reflection film, and the first electrode are stacked up, and the reflection film is laminated onto the first electrode.

10. The organic light-emitting structure according to claim 8, wherein a transmissivity of the translucent electrode to light with a wavelength of 500 nm is at least 20%;

and a reflectivity of the reflection film to light with a wavelength of 500 nm is greater than or equal to 70%.

11. The organic light-emitting structure according to claim 8, wherein at least one of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit further comprises a light extraction layer, the light extraction layer covers one side of the translucent electrode away from the organic laminated body;

and a refractive index of the light extraction layer to light with a wavelength of 500 nm is greater than 1.85.

12. The organic light-emitting structure according to claim 1, wherein the first light-emitting unit is a blue-light emitting unit;

the second light-emitting unit is a green-light emitting unit;

the third light-emitting unit is a yellow-light emitting unit; and

the fourth light-emitting unit is a red-light emitting unit.

13. The organic light-emitting structure according to claim 12, wherein the first light-emitting unit is a fluorescent light-emitting unit.

14. The organic light-emitting structure according to claim 13, wherein each of the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit is a phosphorescent light-emitting unit.

15. The organic light-emitting structure according to claim 14, wherein a material of a light-emitting layer of the phosphorescent light-emitting unit is iridium compound or platinum compound.

16. A display device, comprising an organic light-emitting structure, wherein the organic light-emitting structure comprises:

a first light-emitting unit,

a second light-emitting unit,

a third light-emitting unit, and

a fourth light-emitting unit,

wherein each of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit comprises a first electrode, a second electrode, and an organic laminated body placed between the first electrode and the second electrode;

one of the first electrode and the second electrode is a translucent electrode;

the organic laminated body comprises a light-emitting layer; and

at least one of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit is a fluorescent light-emitting unit.