Nanocomposite, process for preparing the same, and surface emitting device

• US 9,193,850 B2
• Filed: 08/09/2012
• Issued: 11/24/2015
• Est. Priority Date: 08/11/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yagi, Tadao, Konno, Mikio, Miyao, Hiroshi, Nagao, Daisuke, Abe, Keisuke
• Primary Examiner(s): Yang, J. L.
• Application Number:
  US13/570,862
• Publication Number:
  US 20130037786A1
• Time in Patent Office: 1,202 Days
• Field of Search: None
• US Class Current: 1/1
• 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: C08K 9/04 Ingredients treated with organic substances treated with macromolecular compounds C08K9/08
• CPC Class Codes: G02B 2207/101 Nanooptics
• CPC Class Codes: H10K 2102/331 Nanoparticles used in non-emissive layers, e.g. in packaging layer
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses

Abstract

A nanocomposite including: a matrix including a polyimide; and surface-modified inorganic oxide particles disposed in the matrix, wherein a surface of a particle of the surface-modified inorganic oxide particles is modified with an imide functional group.

Claims

1. A nanocomposite comprising:

a matrix comprising a polyimide; and

surface-modified inorganic oxide particles dispersed in the matrix, wherein a surface of the surface-modified inorganic oxide particles is modified with a functional group having an imide backbone,

wherein the functional group having an imide backbone comprises at least one selected from the groups represented by Formulas 1a, 1b, and 1 d;

2. The nanocomposite of claim 1, wherein

X₃ is an unsubstituted C₁-C₂₀ alkylene group, and

R₆, R₇, R₈, R₉, R₁₀, and R₁₁ are each independently a hydrogen atom or an unsubstituted C₁-C₂₀ alkyl group.

3. The nanocomposite of claim 2, wherein X₃ is propylene, and

R₆, R₇, R₈, R₉, R₁₀, and R₁₁ are each hydrogen.

4. The nanocomposite of claim 1, wherein a refractive index of the nanocomposite is 1.7 or greater.

5. The nanocomposite of claim 1, wherein a haze value of the nanocomposite is 10% or less.

6. The nanocomposite of claim 1, wherein a 5% weight loss temperature of the nanocomposite, when measured by thermogravimetric differential thermal analysis, is 450°

C. or higher.

7. The nanocomposite of claim 1, wherein the inorganic oxide particles comprise at least one inorganic oxide selected from titanium oxide, zirconium oxide, and barium titanate.

8. The nanocomposite of claim 1, wherein the inorganic oxide particles comprise barium titanate.

9. The nanocomposite of claim 1, wherein an average particle diameter of the inorganic oxide particles is 2 nanometers to 100 nanometers.

17. A surface emitting device comprising:

a light-transmissive substrate comprising a transparent substrate and a coating layer disposed on the transparent substrate, wherein the coating layer comprises a nanocomposite according to claim 1;

a transparent conductive layer disposed on the light-transmissive substrate; and

an organic EL layer disposed on the transparent conductive layer.

10. A method of preparing a nanocomposite, the method comprising:

providing surface-modified inorganic oxide particles having a surface modified with a functional group having an imide backbone;

contacting the surface-modified inorganic oxide particles with a poly(amic acid) to form a mixture; and

heat-treating the mixture to form a polyimide and prepare the nanocomposite,

wherein the functional group having an imide backbone comprises at least one selected from the groups represented by Formulas 1a, 1b, and 1 d;

11. The method of claim 10, wherein the providing the surface-modified inorganic oxide particles comprises contacting a surface of inorganic oxide particles with an amino group-containing silane coupling agent represented by Formula 1:

12. The method of claim 11, wherein X₁ and X₂ are propylene.

13. The method of claim 11, wherein the surface-modified inorganic oxide particles comprise at least one inorganic oxide selected from zirconium oxide, yttria doped zirconium oxide, lead zirconate, strontium titanate, tin titanate, tin oxide, bismuth oxide, niobium oxide, tantalum oxide, potassium tantalate, tungsten oxide, cerium oxide, lanthanum oxide, gallium oxide, silica, alumina, titanium oxide, zirconium oxide, and barium titanate.

14. The method of claim 11, wherein the amino-functionalized inorganic oxide particles are at least partially imidized with a phthalic anhydride represented by Formula 8:

15. A method of preparing a nanocomposite, the method comprising:

providing surface-modified inorganic oxide particles having a surface modified with a functional group having an imide backbone;

contacting the surface-modified inorganic oxide particles with a diamine and an acid dianhydride to prepare a mixture of the surface-modified inorganic oxide particles and a poly(amic acid); and

heat-treating the mixture to form a polyimide and prepare the nanocomposite,

wherein the functional group having an imide backbone comprises at least one selected from the groups represented by Formulas 1a, 1b, and 1 d;

16. The method of claim 15, wherein the providing surface-modified inorganic oxide particles comprises contacting an inorganic oxide with an amino group-containing silane coupling agent represented by Formula 1: