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US4733128A Expired / Lapsed US ⏱️ 0.0 years remaining

Electroluminescence display device containing a zinc sulfide emission layer with rare earth elements and/or halides thereof and phosphorus

Assignee: Panasonic Holdings Corp
•
Filing: 1984-02-09
•
Granted: 1988-03-22
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Expires: 2004-02-09
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Abstract

Abstract An electroluminescense display device having a emission layer comprising zinc sulfide characterized in that at least one member selected from the group consisting of rare earth elements, manganese, copper, silver, magnesium, aluminum and their halides is contained as an activator, as well as at least one member selected from the group consisting of nitrogen, phosphorus, arsenic and antimony is contained as a coactivator. Said emission layer is formed by sputtering by using, as a target, zinc sulfide containing said activator and coactivator. Said sputtering is conducted in an atmosphere comprising a rare gas or rare gas containing a sulfide gas. The electroluminescence display device of the present invention has a higher brightness than conventional device with a good repeatability.

Inventors

  • 👤 Takao Tohda
  • 👤 Yosuke Fujita
  • 👤 Masahiro Nishikawa
  • 👤 Tomizo Matsuoka
  • 👤 Atsushi Abe
  • 👤 Tsuneharu Nitta

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 00:55
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; C; C09; C09K; C09K11/00; C09K11/08; C09K11/56; C09K11/562; C09K11/565; H05B33/10; H05B33/18

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 36 words
An electroluminescent display device having an emission layer comprising zinc sulfide containing at least one member selected from the group consisting of rare earth elements and their halides as an activator; and phosphorus as a coactivator.
Claim 2
Dependent Claim 36 words
An electroluminescent display device having an emission layer comprising zinc sulfide containing at least one member selected from the group consisting of rare earth elements and their halides as an activator; and phosphorus as a coactivator.
Claim 3
Dependent Claim 37 words
The electroluminescent display device according to claim 1, wherein said activator and said coactivator are contained in amounts of between about 0.1% and 10% of the number of atoms thereof to the number of atoms of zinc.
Claim 4
Dependent Claim 33 words
The electroluminescent display device according to claim 1, wherein the activator is at least one member selected from the group consisting of terbium, praseodynium, samarium, europium, dysprosium, holmium, erbium, thulium, and halides thereof.
Claim 5
Dependent Claim 23 words
The electroluminescent display device according to claim 1, further comprising an insulator layer formed on at least one surface of said emission layer.
Claim 6
Dependent Claim 21 words
The electroluminescent display device according to claim 1, wherein the thickness of said emission layer is less than about 1 μm.
Claim 7
Dependent Claim 21 words
The electroluminescent display device according to claim 5, wherein the thickness of said insulator layer is less than about 1 μm.

References Cited (Backward Citations)

US4381474A Cited
US4171501A Cited
JPS53141185A Cited
US4551397A Cited
JPH09329217A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1991-03-22 1991-09-21 1992-03-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1995-03-22 1995-09-21 1996-03-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1999-03-22 1999-09-21 2000-03-22 $7700.00 Window Closed / Lapsed

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