Organic electroluminescent device and method of manufacturing the same

• US 20050046348A1
• Filed: 08/25/2004
• Published: 03/03/2005
• Est. Priority Date: 08/26/2003
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Hae-Seung, Park, Jin-Woo, Lee, Jong-Hyuk, Kim, Won-Jong, Cho, Yoon-Hyeung
• Granted Patent: US 7,436,117 B2
• Time in Patent Office: Days
• US Class Current: 313/512
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 59/874 including getter material or desiccant

Abstract

Provided are an organic electroluminescent device and a method of manufacturing the same. An organic electroluminescent device, comprising a rear substrate, an organic electroluminescent unit formed on one surface of the rear substrate and having a first electrode, an organic film, and a second electrode, and a front substrate joined to the rear substrate and having a porous oxide layer based on alumina on an inner surface of the front substrate. The alumina is hydrated amorphous alumina. The porous oxide layer is composed of hydrated amorphous alumina; hydrated amorphous alumina and silica; hydrated amorphous alumina, and one or more selected from alkaline metal oxide, alkaline earth metal oxide, metal halide, metal sulfate, and metal perchlorate, which are captured in a network of the alumina; or hydrated amorphous alumina, silica, and one or more selected from alkaline metal oxide, alkaline earth metal oxide, metal halide, metal sulfate, and metal perchlorate, which are captured in a network of the alumina and a network of the silica. The organic electroluminescent device may be used as a front emission type, a rear emission type, or a both-direction emission type display.

Claims

1. An organic electroluminescent device, comprising:

a rear substrate;

an organic electroluminescent unit formed on one surface of the rear substrate and having a first electrode, an organic film, and a second electrode; and

a front substrate joined to the rear substrate and having a porous oxide layer based on alumina on an inner surface of the front substrate.

2. The organic electroluminescent device of claim 1, wherein the alumina is hydrated amorphous alumina.

3. The organic electroluminescent device of claim 1, wherein the porous oxide layer is comprised of:

hydrated amorphous alumina;

hydrated amorphous alumina and silica;

hydrated amorphous alumina, and one or more selected from alkaline metal oxide, alkaline earth metal oxide, metal halide, metal sulfate, or metal perchlorate;

or

hydrated amorphous alumina, silica, and one or more selected from alkaline metal oxide, alkaline earth metal oxide, metal halide, metal sulfate, or metal perchlorate.

4. The organic electroluminescent device of claim 3, wherein the one or more selected from alkaline metal oxide, alkaline earth metal oxide, metal halide, metal sulfate, and metal perchlorate are captured in a network of the hydrated amorphous alumina or a network of hydrated amorphous alumina and a network of silica.

5. The organic electroluminescent device of claim 3, wherein the alkaline metal oxide is lithium oxide (Li₂O), sodium oxide (Na₂O), or potassium oxide (K₂O), the alkaline earth metal oxide is barium oxide (BaO), calcium oxide (CaO), or magnesium oxide (MgO), the metal sulfate is lithium sulfate (Li₂SO₄), sodium sulfate (Nai₂SO₄), calcium sulfate (CaSO₄), magnesium sulfate (MgSO₄), cobalt sulfate (CoSO₄), gallium sulfate (Ga₂(SO₄)₃), titanium sulfate (Ti(SO₄)₂), or nickel sulfate (NiSO₄), the metal halide is calcium chloride (CaCl₂), magnesium chloride (MgCl₂), strontium chloride (SrCl2), yttrium chloride (YCl₂), copper chloride (CuCl₂), cesium fluoride (CsF), tantalum fluoride (TaF₅), niobium fluoride (NbF₅), lithium bromide (LiBr), calcium bromide (CaBr₃), cerium bromide (CeBr₄), selenium bromide (SeBr₂), vanadium bromide (VBr₂), magnesium bromide (MgBr₂), barium iodide (BaI₂), or magnesium iodide (MgI₂), and the metal perchlorate is barium perchlorate (Ba(ClO₄)₂) or magnesium perchlorate (Mg(ClO₄)₂).

6. The organic electroluminescent device of claim 1 or 2, wherein the alumina is bohemite or bayerite.

7. The organic electroluminescent device of claim 1, wherein the porous oxide layer has a thickness in the range of 0.1 to 12 μ

m.

8. The organic electroluminescent device of claim 1, wherein the first electrode is a transparent electrode and the second electrode is a reflective electrode, or the first electrode is a reflective type electrode and the second electrode is a transparent electrode.

9. A method of manufacturing an organic electroluminescent device, comprising:

forming a rear substrate having a first electrode, an organic film, and a second electrode;

coating a composition for forming an alumina comprising aluminum alkoxide and a polar solvent on an inner surface of the front substrate and thermally treating the composition;

coating a sealant on at least a side of the rear substrate and on at least a side of the front substrate; and

joining the rear substrate and the front substrate.

10. The method of claim 9, wherein the alumina is hydrated amorphous alumina.

11. The method of claim 9, wherein the composition for forming an alumina further comprises 0.1 to 0.9 moles of a catalyst for facilitating a hydrolysis reaction, based on 1 mole of the aluminum alkoxide.

12. The method of claim 9, wherein the thermal treatment step is carried out at a temperature in the range of 100 to 550°

C.

13. The method of claim 9, wherein the composition for forming an alumina further comprises a composition for forming silica comprising silicon alkoxide and a polar solvent or a hydrolysate of the composition for forming silica.

14. The method of claim 13, wherein the composition for forming silica further comprises 0.1 to 0.9 moles of a catalyst for facilitating a hydrolysis reaction, based on 1 mole of the silicon alkoxide.

15. The method of claim 13, wherein the silicon alkoxide is tetraethylorthosilicate or tetramethylorthosilicate.

16. The method of claim 9 or 13, wherein the composition for forming an alumina further comprises one or more selected from alkaline metal salt, alkaline earth metal salt, metal halide, metal sulfate, or metal perchlorate.

17. The method of claim 16, wherein the alkaline metal salt is sodium acetate, sodium nitrate, potassium acetate, or potassium nitrate, the alkaline earth metal salt is calcium acetate, calcium nitrate, barium acetate, or barium nitrate, the metal sulfate is Li₂SO₄, Nai₂SO₄, CaSO₄, MgSO₄, CoSO₄, Ga₂(SO₄)₃, Ti(SO₄)₂, or NiSO₄, the metal halide is CaCl₂, MgCl₂, SrCl₂, YCl₂, CuCl₂, CsF, TaF₅, NbF₅, LiBr, CaBr₃, CeBr₄, SeBr₂, VBr₂, MgBr₂, BaI₂, or MgI₂, and the metal perchlorate is Ba(ClO₄)₂ or Mg(ClO₄)₂.

18. The method of claim 9, wherein the aluminum alkoxide is aluminum triisopropoxide and/or aluminum tributoxide.