United States Patent [19] [n] Patent Number: 4,551,397
Yaguchi et al. [45] Date of Patent: Nov. 5, 1985
o I 1 . 1 1 1
[54] ZINC SILICATE PHOSPHOR AND
ELECTRON EXCITED FLUORESCENT
DISPLAY DEVICE USING THE PHOSPHOR
[75] Inventors: Masachika Yaguchi; Tomoki Mikami;
Takashi Hase, all of Odawara, Japan
[73] Assignee: Kasei Optonix, Ltd., Tokyo, Japan
[21] Appl. No.: 596,387
[22] Filed: Apr. 3,1984
[30] Foreign Application Priority Data
Apr. 4, 1983 [JP] Japan 58-58987
Jun. 27, 1983 [JP] Japan 58-115396
[51] Int. CIS C09K 11/44
[52] U.S. CI 428/691; 428/690;
252/301.6 F; 252/301.6 P; 252/301.6 S;
313/467; 313/468
[58] Field of Search 252/301.6 F, 301.6 P,
252/301.6 S; 313/467, 468; 428/690, 691
[56] References Cited
U.S. PATENT DOCUMENTS
2,169,046 8/1939 Headrick 252/301.6 F
2,314,699 3/1943 Hale 252/301.6 F
4,315,190 2/1982 Peters et al 252/301.6 F
FOREIGN PATENT DOCUMENTS
10676 4/1982 Japan .
OTHER PUBLICATIONS
Royce "RCA Technical Notes"-RCA TN No. 117.
Primary Examiner—Jack Cooper
Attorney, Agent, or Firm—Obion, Fisher, Spivak,
McClelland & Maier
[57] ABSTRACT
A zinc silicate phosphor represented by the formula:
(Znw.2„, M«r, Naa^SiCkMn., As„, Mc . (I)
where M11 is at least one element selected from the group consisting of barium, calcium and strontium, M is at least one of antimony and bismuth, and x, y, a, b and c satisfy the conditions of O=xS5xl0-2, OS 2y^5xl0-3, 5xlO-5§aS3XlO-2, O^b^5xl0-3 and 0<c3= 1X 10-2, respectively (provided x+2y^=0).
15 Claims, 5 Drawing Figures
