PROCESS FOR PRODUCING ELECTROLUMINESCENT DEVICE

• US 20090087546A1
• Filed: 09/23/2008
• Published: 04/02/2009
• Est. Priority Date: 09/28/2007
• Status: Abandoned Application

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Ilzumi, Yasuhiro, Shimogawara, Masaya
• Application Number:
  US12/236,000
• Publication Number:
  US 20090087546A1
• Time in Patent Office: Days
• US Class Current: 427/66
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: H05B 33/145 Arrangements of the electroluminescent material
• CPC Class Codes: H10K 50/115 comprising active inorganic nanostructures, e.g. luminescent quantum dots
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3

Abstract

A process for producing an electroluminescent device comprises the steps of preparing a substrate 1, forming a first electrode layer 2 on the substrate 1, and forming a luminescent layer 3 on the first electrode layer 2 by applying a luminescent-layer-forming coating liquid containing quantum dots 22, each quantum dot 22 being surrounded by organic ligands 21. After the luminescent-layer-forming step, the step of removing the organic ligands 21 from the quantum dots 22 by subjecting the luminescent layer 3 to UV-ozone cleaning is performed. After the organic-ligand-removing step, the step of forming a second electrode layer 4 on the luminescent layer 3 in which the organic ligands 21 have been removed from the quantum dots 22 is performed.

Claims

1. A process for producing an electroluminescent device, comprising the steps of:

preparing a substrate,

forming a first electrode layer on the substrate,

forming a luminescent layer on the first electrode layer by applying, to the first electrode layer, a luminescent-layer-forming coating liquid containing quantum dots, each quantum dot being surrounded by organic ligands,

removing the organic ligands from the quantum dots by subjecting the luminescent layer to UV-ozone cleaning, and

forming a second electrode layer on the luminescent layer in which the organic ligands have been removed from the quantum dots.

2. The process for producing an electroluminescent device according to claim 1, further comprising, between the first-electrode-layer-forming step and the luminescent-layer-forming step, the step of forming, on the first electrode layer, a hole injection transporting layer of an inorganic material having the property of injecting holes.

3. The process for producing an electroluminescent device according to claim 1, wherein the quantum dot is composed of a core part made of a semiconductor fine particle and a shell part covering the core part, made from a material having a greater band gap than the semiconductor fine particle.

4. A process for producing an electroluminescent device, comprising the steps of:

preparing a substrate,

forming a first electrode layer on the substrate,

forming a luminescent layer on the first electrode layer by applying, to the first electrode layer, a luminescent-layer-forming coating liquid containing quantum dots, each quantum dot being surrounded by organic ligands,

removing the organic ligands from the quantum dots by plasma irradiation of the luminescent layer, and

forming a second electrode layer on the luminescent layer in which the organic ligands have been removed from the quantum dots.

5. The process for producing an electroluminescent device according to claim 4, further comprising, between the first-electrode-layer-forming step and the luminescent-layer-forming step, the step of forming, on the first electrode layer, a hole injection transporting layer of an inorganic material having the property of injecting holes.

6. The process for producing an electroluminescent device according to claim 4, wherein the quantum dot is composed of a core part made of a semiconductor fine particle and a shell part covering the core part, made from a material having a greater band gap than the semiconductor fine particle.

7. A process for producing an electroluminescent device, comprising the steps of:

preparing a substrate,

forming a first electrode layer on the substrate,

forming a luminescent layer on the first electrode layer by applying, to the first electrode layer, a luminescent-layer-forming coating liquid containing quantum dots, each quantum dot being surrounded by organic ligands,

placing, above the luminescent layer, a photocatalytic treatment layer containing at least a photocatalyst,

removing the organic ligands from the quantum dots by applying energy to the photocatalytic treatment layer, and

forming a second electrode layer on the luminescent layer in which the organic ligands have been removed from the quantum dots.

8. The process for producing an electroluminescent device according to claim 7, further comprising, between the first-electrode-layer-forming step and the luminescent-layer-forming step, the step of forming, on the first electrode layer, a hole injection transporting layer of an inorganic material having the property of injecting holes.

9. The process for producing an electroluminescent device according to claim 7, wherein the quantum dot is composed of a core part made of a semiconductor fine particle and a shell part covering the core part, made from a material having a greater band gap than the semiconductor fine particle.