EL device

• US 20010015619A1
• Filed: 12/08/2000
• Published: 08/23/2001
• Est. Priority Date: 04/08/1999
• Status: Active Grant

• Current Assignee: iFire IP Corporation
• Original Assignee: TDK Corporation
• Inventors: Nomura, Takeshi, Takeishi, Taku, Nagano, Katsuto, Takayama, Suguru
• Granted Patent: US 6,891,329 B2
• Time in Patent Office: Days
• US Class Current: 313/506
• CPC Class Codes: H05B 33/02 Details
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
• CPC Class Codes: H05B 33/26 characterised by the composition or arrangement of the conductive material used as an electrode
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

The invention provides an EL device having a structure in which a first electrode 12 formed according to a predetermined pattern, a first insulator layer 13, an electroluminescence-producing light emitting layer 14, a second insulator layer 15 and a second electrode layer 16 are successively stacked on an electrical insulating substrate 11. At least one of the first insulator layer 13 and the second insulator layer 15 contains as a main component barium titanate and as subordinate components magnesium oxide, manganese oxide, yttrium oxide, at least one oxide selected from barium oxide and calcium oxide and silicon oxide. The ratios of magnesium oxide, manganese oxide, yttrium oxide, barium oxide, calcium oxide and silicon oxide with respect to 100 moles of barium titanate are:

MgO:0.1 to 3 moles,MnO:0.05 to 1.0 mole,Y₂O₃:1 mole or less,BaO + CaO:2 to 12 moles, andSiO_2:2 to 12 moles,

as calculated on MgO, MnO, Y₂O₃, BaO, CaO, SiO₂ and BaTiO₃ bases, respectively.

Claims

1. An EL device having a structure in which a first electrode formed according to a predetermined pattern, a first insulator layer, an electroluminescence-producing light emitting layer, a second insulator layer and a second electrode layer are successively stacked on an electrical insulating substrate, wherein:

at least one of said first insulator layer and said second insulator layer contains as a main component barium titanate and as subordinate components magnesium oxide, manganese oxide, yttrium oxide, at least one oxide selected from barium oxide and calcium oxide, and silicon oxide, with ratios of magnesium oxide, manganese oxide, yttrium oxide, barium oxide, calcium oxide and silicon oxide with respect to 100 moles of barium titanate being;

MgO;

0.1 to 3 moles,MnO;

0.05 to 1.0 mole,Y₂O₃;

1 mole or less,BaO + CaO;

2 to 12 moles, andSiO₂;

2 to 12 moles,

as calculated on MgO, MnO, Y₂O₃, BaO, CaO, SiO₂ and BaTiO₃ bases, respectively.

2. The EL device according to

claim 1

, wherein said electrical insulating substrate and said first insulator layer are each formed of a ceramic material.

3. The EL device according to

claim 1

or

2

, which contains BaO, CaO and SiO₂ in a form represented by (Ba_xCa_1-xO)_y.SiO₂ where 0.3≦

x≦

0.7 and 0.95≦

y≦

1.05 and in an amount of 1 to 10% by weight with respect to the sum of BaTiO₃, MgO, MnO and Y₂O₃.

4. The EL device according to

claim 2

or

3

, wherein said first electrode contains one or two or more of Ni, Ag, Au, Pd, Pt, Cu, Ni, W, Mo, Fe, and Co or any one of Ag—

Pd, Ni—

Mn, Ni—

Cr, Ni—

Co and Ni—

Al alloys.