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EP0145470A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Thin-film electroluminescent element

Assignee: Panasonic Holdings Corp
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Filing: 1984-12-07
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Granted: —
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Expires: 2004-12-07
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Abstract

Abstract @ The development of a dielectric thin-film which is high (140 MV/cm or above) in product of dielectric constant ε i and dielectric breakdown field strength E ib is essential for realizing an EL element which can operate stably at a low voltage. Such dielectric film is also required which can withstand heat treatments at high temperatures above 500°C and is proof against clouding and in which the electrical breakdown caused by a minute fault produced in the process of film formation is self-healed. A film material which satisfies all of these requirements could be obtained from a Ti0 2 -BaO based composition by partially substituting the position of Ti with Sn, Zr or Hf and also partially substituting the position of Ba with Ca or Mg. By using these dielectric films, it is possible to obtain a low-voltage drive thin-film electroluminescent element which are high in production yield and reliability.

Inventors

  • 👤 Jun Kuwata
  • 👤 Yosuke Fujita
  • 👤 Tsuneharu Nitta
  • 👤 Tomizo Matsuoka
  • 👤 Atsushi Abe

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-07 07:53
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/22; H01; H01B; H01B3/00; H01B3/02; H01B3/12; Y; Y10; Y10S; Y10S428/00; Y10S428/917; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 118 words
A thin-film electroluminescent element comprising a filmy phosphor layer, a filmy dielectric layer provided on at least one side of said phosphor layer, and two electrode layers at least one of which is pervious to light, said electrode layers being so arranged as to apply a voltage to said phosphor and dielectric layers, wherein the essential composition of said dielectric layer is expressed by the following formula: wherein x, y and z are the numbers defined as: 0.4 < x < 0.8, 0 < y < 1, and 0 < z < 1, and A is at least one element selected from Zr, Hf and Sn, and B is at least one element selected from Mg and Ca.
Claim 2
Dependent Claim 118 words
A thin-film electroluminescent element comprising a filmy phosphor layer, a filmy dielectric layer provided on at least one side of said phosphor layer, and two electrode layers at least one of which is pervious to light, said electrode layers being so arranged as to apply a voltage to said phosphor and dielectric layers, wherein the essential composition of said dielectric layer is expressed by the following formula: wherein x, y and z are the numbers defined as: 0.4 < x < 0.8, 0 < y < 1, and 0 < z < 1, and A is at least one element selected from Zr, Hf and Sn, and B is at least one element selected from Mg and Ca.
Claim 3
Dependent Claim 36 words
A thin-film electroluminescent element according to Claim 1, wherein in the compositional formula of the essential components of the dielectric layer, A is Zr or Hf and y is a range defined as: y < 0.5.
Claim 4
Dependent Claim 34 words
A thin-film electroluminescent element according to Claim 1, wherein in the compositional formula of the essential components of the dielectric layer, A is Sn and y is a range defined as: y < 0.3.
Claim 5
Dependent Claim 34 words
A thin-film electroluminescent element according to Claim 1, wherein in the compositional formula of the essential components of the dielectric layer, B is Mg and z is a range defined as: z < 0.4.
Claim 6
Dependent Claim 34 words
A thin-film electroluminescent element according to Claim 1, wherein in the compositional formula of the essential components of the dielectric layer, B is Ca and z is a range defined as: z < 0.3.

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