Material for use in the manufacturing of luminous display devices
(19)AUSTRALIAN PATENT OFFICE(54) Title MAIbRIAL FOR USE IN THE MANUFACTURING OF LUMINOUS DISPLAY DEVICES (21) Application No: 2003265927 (22) Application Date: 2003.09.03 (87) WIPONo: WO04/023436 (30) Priority Data (31) Number (32) Date (33) Country 0210865 2002.09.03 FR (43) Publication Date : 2004.03.29 (43) Publication Journal Date : 2004.05.13 (71) Applicant(s) CORNING INCORPORAIbD (72) Inventor(s) DAHMANI, Brahim; GUZMAN, Guillaume (H) Application NoAU2003265927 A1(19)AUSTRALIAN PATENT OFFICE(54) Title MAIbRIAL FOR USE IN THE MANUFACTURING OF LUMINOUS DISPLAY DEVICES (21) Application No: 2003265927 (22) Application Date: 2003.09.03 (87) WIPONo: WO04/023436 (30) Priority Data (31) Number (32) Date (33) Country 0210865 2002.09.03 FR (43) Publication Date : 2004.03.29 (43) Publication Journal Date : 2004.05.13 (71) Applicant(s) CORNING INCORPORAIbD (72) Inventor(s) DAHMANI, Brahim; GUZMAN, Guillaume A material including a glass or vitroceramic substrate having a first layer and a second layer deposited thereon, each of the first and second layers including at least one transparent conducting oxide (TCO). The first layer has a roughness of more than 1 nm and the second layer has a roughness less than or equal to 1 nm. A transmittance in the visible wavelength range of the material is at least 80%. The work function of the second layer is greater than the work function of the first layer and is greater than 4.6 eV. CLAIMS We Claim: 1. A material comprising: - a glass or vitroceramic substrate, - a first layer deposited on one side of said substrate and having at least one transparent conducting oxide, simple or mixed, doped or not, said layer being hereafter called first TCO layer, - a second layer deposited on said first TCO layer and having at least one transparent conducting oxide, simple or mixed, doped or not, hereafter called the second TCO layer, both TCO layers being such that:STDC0468 - said first TCO layer has a roughness of more than 1 nm and said second TCO layer has a roughness less than or equal to 1 nm, - transmittance in the visible range of the product having said first and second TCO layers is equal to at least 80%, - the work function of said second TCO layer is greater than the work function of said first TCO layer and is greater than 4.6 eV.
2. The material according to claim 1, wherein said work function of said second TCO layer is greater than 4. 8 eV.
3. The material according to claim 1, wherein both TCO layers include at least one oxide in the form of a simple or mixed oxide or a mixture of oxides of at least one metal chosen from the group comprised of tin, zinc, indium and cadmium, possibly combined with at least one element from the group comprised of gallium, antimony, fluorine, aluminium, magnesium and zinc, said element entering into the composition of said mixed oxide or said mixture of oxides or acting as a doping agent for said oxide.
4. Material according to claim 1, wherein said first TCO layer includes as an essential constituent: - indium oxide doped with tin (In203 : Sn), hereafter called ITO, - tin oxide doped with fluorine (SnO2 : F), - zinc oxide doped with aluminium (ZnO: Al) - tin oxide doped with antimony (Sn02 : Sb). <Desc/Clms Page number 17> 5. Material according to claim 3, wherein said second TCO layer is essentially comprised of at least one oxide, doped or not, selected from the group consisting essentially of : - Sn02 - Sn02 : F - Sn02 : Sb -In4Sn3012 Zn2In205 - ZnSn03 - Zn2Sn04 -GaInO3 - Mgln204 6. The material according to claim 3, wherein said second TCO layer is a layer of tin oxide doped with antimony (ATO), Sn02 : Sb.
7. The material according to claim 1, wherein the thickness of said second TCO layer is between 30 and 200 nm.
8. The material according to claim 6, wherein the thickness of said second TCO layer is between 50 and 150 nm.
9. The material according to claim 7, wherein the thickness of said substrate is between 0.1 and 3 mm.
10. A luminous display device comprising an anode and a cathode, its anode side including a material such as that defined in claim 1.
11. Luminous display device according to claim 9, wherein said device is an organic light emitting diode (OLED) incorporating, on its anode side, a material coated with at least one light emitting layer inserted between the second TCO layer of said material and a metal cathode.
12. A process for manufacturing a material or a device, the process comprises: depositing, on a glass or vitroceramic substrate previously coated with a first TCO layer, a second TCO layer by means of a sol-gel type coating process. <Desc/Clms Page number 18> 13. The process according to claim 11, wherein the process also includes a heat consolidation step for said second TCO layer.
14. The process according to claim 11, wherein said preliminary deposition of the first TCO layer is carried out by a vacuum spraying process or in the form of chemical deposition in vapour phase.