Aluminum oxide and aluminum oxynitride layers for use with phosphors for electroluminescent displays
First Claim
Patent Images
1. A phosphor laminate for a thick dielectric film electroluminescent device, said laminate comprising:
- a rare earth activated alkaline earth thioaluminate phosphor thin film layer;
an aluminum oxide or aluminum oxynitride layer having a thickness of 20 nm to 50 nm provided directly adjacent and in contact with a bottom of said phosphor thin film layer;
a thick film dielectric layer below said aluminum oxide or aluminum oxynitride layer, the thick film dielectric layer comprising a bottom layer and a smoothing layer; and
a layer of barium titanate provided on top of said smoothing layer.
3 Assignments
0 Petitions
Accused Products
Abstract
A novel laminate is provided to improve the operating stability of thioaluminate based phosphors used in ac thick film dielectric electroluminescent displays. The novel structure comprises a rare earth activated alkaline earth thioaluminate phosphor thin film layer and an aluminum oxide or aluminum oxynitride layer provided directly adjacent and in contact with the bottom of the phosphor thin film layer. The invention is particularly applicable to phosphors used in electroluminescent displays that employ thick dielectric layers subject to high processing temperatures to form and activate the phosphor films.
39 Citations
37 Claims
-
1. A phosphor laminate for a thick dielectric film electroluminescent device, said laminate comprising:
-
a rare earth activated alkaline earth thioaluminate phosphor thin film layer; an aluminum oxide or aluminum oxynitride layer having a thickness of 20 nm to 50 nm provided directly adjacent and in contact with a bottom of said phosphor thin film layer; a thick film dielectric layer below said aluminum oxide or aluminum oxynitride layer, the thick film dielectric layer comprising a bottom layer and a smoothing layer; and a layer of barium titanate provided on top of said smoothing layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A thick film dielectric electroluminescent device comprising:
-
a thioaluminate phosphor; a layer of aluminum oxide or aluminum oxynitride having a thickness of 20 nm to 50 nm directly adjacent a bottom surface of the phosphor; a thick film dielectric layer below said layer of aluminum oxide or aluminum oxynitride, the thick film dielectric layer comprising a bottom layer and smoothing layer; and a layer of barium titanate provided on top of said smoothing layer. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
-
Specification