EP0563009A1
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EP
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Organic electroluminescent element
Assignee: BASF Schweiz AG
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Filing: 1993-03-15
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Granted: —
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Expires: 2013-03-15
Abstract
Abstract An organic electroluminescent element (1) in which an anode (13), a hole transport layer (15), a light-emitting layer (17) and a cathode (19) are laminated in this order, wherein the cathode comprises a metal block portion or portions (19A) comprising a metal having a high work function and a metal block portion or portions (19B) comprising a metal having a low work function, both of the metal block portions of the metal having a high work function and of the metal having a low work function being in contact with the light-emitting layer (17), and a process for preparing the same by using the technique of vapor-deposition. The present invention can provide an El element which can give a higher luminance and longer lifetime than those proposed conventionally with a low applied voltage in the constitution of an anode/a hole transport layer/a light-emitting layer/a cathode, and, with no restriction of material used.
Inventors
- 👤 Junji Ohtani
- 👤 Michio Dr. Matsumura
- 👤 Katsura Ikuta
- 👤 Takashi Deno
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 05:17
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/26; H05B33/10; H10; H10K; H10K50/00; H10K50/80; H10K50/805; H10K50/82; H10K50/826
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
An organic electroluminsecent element (1) in which an anode (13), a hole transport layer (15), a light-emitting layer (17) and a cathode (19) are laminated in this order, characterized in that said cathode comprises a metal block portion or portions (19A) comprising a metal having a high work function and a metal block portion or portions (19B) comprising a metal having a low work function, both of the metal block portions of the metal having a high work function and of the metal having a low work function being in contact with the light-emitting layer (17).
Claim 2
Dependent Claim
40 words
An organic electroluminescent element according to Claim 1, wherein the difference between the work function of the metal having a high work function and the work function of the metal having a low work function is at least 0.4 eV.
Claim 3
Dependent Claim
22 words
An organic electroluminescent element according to Claim 2, wherein the difference is in the range of between 0.4 eV and 2.5 eV.
Claim 4
Dependent Claim
32 words
An organic electroluminescent element according to Claim 1, or 2 wherein Ni, Au, Pt, Pd, Ag or Cu or an alloy thereof, is used as the metal having a high work function.
Claim 5
Dependent Claim
28 words
An organic electroluminescent element according to Claim 4, wherein Ni, Au, Pt or Pd or an alloy thereof is used as the metal having a high work function.
Claim 6
Dependent Claim
27 words
An organic electroluminsecent element according to Claim 1, wherein Al, Mg, Li or In, or alloys thereof is used as the metal having a low work function.
Claim 7
Dependent Claim
27 words
An organic electroluminescent element according to Claim 1, wherein the thickness of the thin metal film having a high work function is 2 Å to 200 Å.
Claim 8
Dependent Claim
27 words
An organic electroluminescent element according to Claim 7, wherein the thickness of the thin metal film having a high work function is 5 Å to 150 Å.
Claim 9
Dependent Claim
125 words
A process of the preparation of an organic electroluminescent element comprised of an anode, a hole transport layer, a light-emitting layer and a cathode layer laminated in this order according to claim 1, characterized in that the cathode layer is formed on the light-emitting layer by firstly depositing by vacuum deposition a metal having a high work function to such a membrane thickness to form a discontinuous membrane of the metal having a high work function and subsequently depositing by vacuum deposition a metal having a low work function on the metal having a high work function, whereby both of the deposited metal having a high work function and the deposited metal having a low work function are brought into contact with the light-emitting layer.
Claim 10
Dependent Claim
125 words
A process of the preparation of an organic electroluminescent element comprised of an anode, a hole transport layer, a light-emitting layer and a cathode layer laminated in this order according to claim 1, characterized in that the cathode layer is formed on the light-emitting layer by firstly depositing by vacuum deposition a metal having a low work function to such a membrane thickness to form a discontinuous membrane of the metal having a low work function and subsequently depositing by vacuum deposition a metal having a high work function on the metal having a low work function, whereby both of the deposited metal having a high work function and the deposited metal having a low work function are brought into contact with the light-emitting layer.
References Cited (Backward Citations)
EP0468440A2
Cited
EP0468438A2
Cited
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