Organic light emitting device

Patent metadata

Field	Value
Publication number	US-9525151-B2
Application number	US-201214130090-A
Country	US
Kind code	B2
Filing date	Jun 15, 2012
Priority date	Jun 30, 2011
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

Provided is an organic light emitting device including a nano composite layer. The organic light emitting device adopts a nano composite layer including an insulator and light emitting nano-particles within a device, thereby simultaneously insulating a control electrode and changing the color of light emitted from a light emitting layer, thereby improving external quantum efficiency. Further, the amount of electron holes and electrons injected into the light emitting layer may be adjusted through a voltage applied to the control electrode so as to secure a stable current when the device is operated. In addition, when compared to a conventional light emitting device, the surface area of positive and negative electrodes may be reduced so as to reduce reflectance with respect to external light.

First claim

The invention claimed is:

1. An organic light emitting device, comprising:
a substrate;
a control electrode formed on the substrate;
a nano-composite layer formed on the control electrode;
a light emitting layer formed on the nano-composite layer;
an anode formed on the light emitting layer; and
a cathode spaced apart from the anode and formed on the light emitting layer,
wherein the nano-composite layer insulates the control electrode and changes a color of light generated from the light emitting layer, and the control electrode controls the amount of charges injected into the light emitting layer, and
wherein the nano-composite layer includes an insulator and light emitting nano-particles.

2. The organic light emitting device of claim 1 , wherein the insulator includes polymethyl methacrylate (PMMA), polyimide (PI), polyvinyl alcohol (PVA), or polyvinyl pyrrolidone (PVP).

3. The organic light emitting device of claim 1 , wherein the insulator includes LiF, SiO 2 , SiN, WO 3 , Al 2 O 3 , BaTiO 2 , ZrTiO 2 , PbTiO 3 , Ba(Zr x Ti 1-x )O 3 , or Pb(Zr x Ti 1-x )O 3 .

4. The organic light emitting device of claim 1 , wherein the light emitting nano-particles include quantum dots or a fluorescent material.

5. The organic light emitting device of claim 4 , wherein the fluorescent material includes at least one selected from yellow, red, green, and blue fluorescent materials.

6. The organic light emitting device of claim 1 , wherein the control electrode is formed of a metal.

7. The organic light emitting device of claim 1 , wherein the control electrode is formed of at least one selected from carbon nano-tubes (CNTs), graphene, graphene oxide, Al-doped ZnO, Ga-doped ZnO, In-doped ZnO, (In, Ga)-doped ZnO, Mg-doped ZnO, Al- or Ga-doped MgO, Sn-doped In 2 O 3 , F-doped SnO 2 , and Nb-doped TiO 2 .

8. The organic light emitting device of claim 1 , further comprising:
a hole transport layer interposed between a part on the light emitting layer and the anode; and
an electron transport layer interposed between a part on the light emitting layer and the cathode and spaced apart from the hole transport layer.

Assignees

• Kim Tae Whan
• Bang Hyun Sung
• Choo Dong Chul
• Industry-Univ Coop Found Hanyang Univ
• Top Eng Co Ltd

Inventors

• Kim Tae Whan
• Bang Hyun Sung
• Choo Dong Chul

Classifications

• B82Y10/00 Primary

  Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic · CPC title

• H10K59/805

  Electrodes · CPC title

• H01L51/0048

  Electricity · mapped topic

• H01L51/502

  Electricity · mapped topic

• H01L51/5203 Primary

  Electricity · mapped topic