Light emitting microcapsule, method of preparing the same and OLED display device comprising the same

• US 10,312,463 B2
• Filed: 09/07/2017
• Issued: 06/04/2019
• Est. Priority Date: 12/26/2013
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Inventors: Chen, Changdi, Yuk, Sangman, Luo, Yiyong, Yang, Tao
• Primary Examiner(s): Zemel, Irina S
• Application Number:
  US15/697,872
• Publication Number:
  US 20170365807A1
• Time in Patent Office: 635 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 50/12 comprising dopants
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/873 Encapsulations
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/761 Biomolecules or bio-macromolecules, e.g. proteins, chlorophyl, lipids or enzymes

Abstract

The present invention, which belongs to the technical field of display technology, provides a microcapsule, a method of preparing the same, and an OLED (organic light emitting diode) display device comprising the same. The OLED display device comprises a microcapsule having a phosphorescent material as a core material, which reduces the probability of the phosphorescence self-quenching and is isolated from water and oxygen, thereby improving the display quality and extending the service life of the OLED display device. Therefore, the OLED display device can solve the problem that the phosphorescence OLED display device in the prior art has a low brightness and short service life.

Claims

1. An OLED display device including a light emitting material layer, wherein the light emitting material layer comprises a microcapsule comprising a wall material and a core material encapsulated in the wall material, wherein the core material is a phosphorescent material, and the wall material is selected from any one of gelatin, ethyl cellulose and arabic gum;

and

wherein the wall material has a transmittance greater than 90%, a moisture permeability less than 1 μ

g/(m2.day), and an oxygen permeability less than 1 mg/(m2.day).

2. The OLED display device according to claim 1, further including an electron transport layer, an electron injection layer and a cathode layer which are disposed sequentially on one side of the light emitting material layer, and a hole transport layer, a hole injection layer and a anode layer which are disposed sequentially on the other side of the light emitting material layer.

3. The OLED display device according to claim 2, further including a thin film layer for encapsulation which is disposed on the side of the cathode opposite to the light emitting layer.

4. The OLED display device according to claim 3, wherein the thin film layer comprises an aluminum-based complex having the following molecular structure: