GLASS SUBSTRATE COATED WITH A HIGH-INDEX LAYER UNDER AN ELECTRODE COATING, AND ORGANIC LIGHT-EMITTING DEVICE COMPRISING SUCH A SUBSTRATE

• US 20120313134A1
• Filed: 01/12/2011
• Published: 12/13/2012
• Est. Priority Date: 01/22/2010
• Status: Active Grant

• Current Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Inventors: Vermersch, François-Julien, Abensour, Sylvie, Allano, Jean-Luc, Ehrensperger, Marie-Virginie
• Granted Patent: US 9,108,881 B2
• Time in Patent Office: Days
• US Class Current: 257/99
• CPC Class Codes: C03C 17/3411 with at least two coatings of inorganic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: C03C 17/3423 at least one of the coatings comprising a suboxide
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3618 Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic
• CPC Class Codes: C03C 17/3671 specially adapted for use as electrodes
• CPC Class Codes: C03C 2217/425 consisting of a porous layer
• CPC Class Codes: C03C 2217/452 Glass
• CPC Class Codes: C03C 2217/48 having a specific function
• CPC Class Codes: C03C 2217/78 Coatings specially designed to be durable, e.g. scratch-resistant
• CPC Class Codes: C03C 4/20 for chemical resistant glass
• CPC Class Codes: C03C 8/04 containing zinc
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/854 comprising scattering means

Abstract

A glass substrate including a first face and a second face opposing the first face, the substrate including, above the second face, an electrode layer which includes at least one electrically conducting layer, wherein the substrate includes, between the second face and the electrode layer, at least one layer of vitreous material having an index in the range from 1.7to 2.4and including from 40% to 60% by weight of bismuth oxide Bi₂O₃ and from 5% to 30% by weight of ZnO.

Claims

1. A glass substrate comprising a first face and a second face opposing the first face, said substrate comprising, above the second face, an electrode layer which comprises an electrically conducting layer, wherein said substrate comprises, between the second face and the electrode layer, a layer of vitreous material having an index in the range from 1.7 to 2.4 and comprising from 40% to 60% by weight of bismuth oxide Bi₂O₃ and, from 5% to 30% by weight, of ZnO.

2. The substrate as claimed in claim 1, wherein said layer of vitreous material has a thickness in the range from 1 μ

m to 100 μ

m.

3. The substrate as claimed in claim 1, comprising between the second face and the electrode layer a plurality of layers of vitreous material each having a different index, a layer of vitreous material disposed in the direction of said second face of the substrate having an index lower than that of another layer of vitreous material disposed in the direction of said electrode layer and said layers of vitreous material all comprising from 40% to 60% by weight of bismuth oxide Bi₂O₃ and from 5% to 30% by weight of ZnO.

4. The substrate as claimed in claim 1, wherein the layer of vitreous material comprises diffusing elements of index different from that of the layer of vitreous material and/or crystals.

5. The substrate as claimed in claim 1, wherein the layer of vitreous material comprises, by weight:

from 0% to 10% of SiO₂,

from 0% to 5% of Al₂O₃,

from 8% to 25% of B₂O₃,

from 0% to 10% of CaO,

from 0% to 20% of BaO,

from 0% to 5% of Li₂O,

from 0% to 10% of Na₂O,

from 0% to 5% of K₂O,

from 0% to 5% of ZrO₂,

from 0% to 5% of SrO, and

from 0% to 5% of La₂O₃.

6. The substrate as claimed in claim 1, comprising diffusing elements with an index different from that of the layer of vitreous material and/or of crystals.

7. The substrate as claimed in claim 1, wherein said first face of the substrate is a diffusing surface.

8. The substrate as claimed in claim 1, wherein said second face of the substrate is a diffusing surface and/or is coated with a diffusing layer.

9. The substrate as claimed in claim 1, comprising, above the electrode layer, an organic light-emitting system.

10. A device with an organic light-emitting diode emitting polychromatic light comprising a substrate as claimed in claim 1, and the electrode layer forming one of several electrodes of the device.

11. A support in a device with an organic light-emitting diode including a substrate as claimed in claim 1, the electrode layer forming one of several electrodes of the device.

12. A method of fabrication of a glass substrate comprising a first face and a second opposing face, as claimed in claim 1, said substrate comprising, above the second face, an electrode layer which comprises an electrically conducting layer, the method comprising depositing a layer of vitreous material having an index in the range from 1.7 to 2.4 above said second face of said substrate prior to depositing said electrode layer, said layer of vitreous material comprising from 40% to 60% by weight of bismuth oxide Bi₂O₃ and from 5% to 30% by weight of ZnO, and said layer of vitreous material being deposited from a frit.

13. The substrate as claimed in claim 1, comprising from 45% to 58% by weight of bismuth oxide Bi₂O₃.

14. The substrate as claimed in claim 1, comprising from 10% to 25% by weight of ZnO.

15. The substrate as claimed in claim 2, wherein the thickness is in the range from 2 μ

m to 80 μ

m.

16. The substrate as claimed in claim 15, wherein the thickness is in the range from 5 μ

m to 60 μ

m.

17. The substrate as claimed in claim 4, wherein the diffusing elements include air bubbles and/or particles of material.

18. The substrate as claimed in claim 5, wherein the layer of vitreous material comprises, by weight:

from 0% to 5% of SiO₂,

from 0% to 1% of Al₂O₃,

from 10% to 22% of B₂O₃,

from 10% to 5% of CaO,

from 10% to 15% of BaO,

from 10% to 3% of Li₂O,

from 10% to 5% of Na₂O,

from 10% to 3% of K₂O, and

from 10% to 4% of ZrO₂.

19. The substrate as claimed in claim 1, wherein said first face of the substrate is coated with a diffusing layer.

20. The substrate as claimed in claim 1, wherein said first face of the substrate is coated with a diffusing layer and said first face of the substrate is a diffusing surface.

21. The method as claimed in claim 12, wherein said layer of vitreous material is deposited by silkscreen printing or by sputtering.

22. A structure for use in a light emitting device, the structure comprising:

a glass substrate comprising a first face and a second face opposite the first face;

an electrode layer arranged over the second face, the electrode layer including an electrically conducting layer; and

a layer of vitreous material arranged between the second face and the electrode layer, the layer of vitreous material having an index in the range from 1.7 to 2.4 and comprising from 40% to 60% by weight of bismuth oxide Bi₂O₃ and from 5% to 30% by weight of ZnO.

23. The structure as claimed in claim 22, wherein the layer of vitreous material is in contact with the second face and with the electrode layer.

24. An organic light-emitting diode device configured to emit polychromatic light comprising a structure including

a glass substrate comprising a first face and a second face opposite the first face;

an electrode layer arranged over the second face, the electrode layer including an electrically conducting layer; and

a layer of vitreous material arranged between the second face and the electrode layer, the layer of vitreous material having an index in the range from 1.7 to 2.4 and comprising from 40% to 60% by weight of bismuth oxide Bi₂O₃ and from 5% to 30% by weight of ZnO.

25. The organic light-emitting diode device as claimed in claim 24, wherein the layer of vitreous material is in contact with the second face and with the electrode layer.