Claims
- 1. A method for minimizing the operating voltage of an organic light emitting diode, which comprises:providing a transparent substrate; applying thereto a transparent bottom electrode; applying directly onto said bottom electrode a semitransparent layer of a metal having a work function in the range from 4 to 7 eV; applying directly onto said semitransparent layer at least one organic functional layer and a top electrode comprising magnesium and silver.
- 2. The process according to claim 1, wherein magnesium and silver are applied successively.
- 3. The process according to claim 1, wherein magnesium and silver are applied simultaneously.
- 4. The process according to claim 1, wherein the semitransparent layer is applied by electron beam vaporization.
- 5. The process according to claim 1, wherein the semitransparent layer is applied by sputtering.
- 6. The process according to claim 1, wherein the semitransparent layer is applied by thermal vaporization.
- 7. The process according to claim 1, in which the semitransparent layer of a metal is a hole injection layer.
- 8. The process according to claim 1, wherein the metal of said semitransparent layer is platinum.
- 9. A method for minimizing the operating voltage of an organic light emitting diode, which comprises:providing a transparent substrate; applying thereto a transparent bottom electrode; applying directly onto said bottom electrode a semitransparent layer of a metal having a work function in the range of greater than 4 to 7 eV; applying directly onto said semitransparent layer at least one organic functional layer and a top electrode consisting of magnesium and silver.
- 10. A method for minimizing the operating voltage of an organic light emitting diode, which comprises:providing a transparent substrate; applying thereto a transparent bottom electrode; applying directly onto said bottom electrode a semitransparent layer of a metal having a work function in the range of greater than 4 to 7 eV; applying directly onto said semitransparent layer at least one organic functional layer and a top electrode comprising magnesium and silver.
- 11. The method according to claim 10, wherein said metal of said semitransparent layer is selected from the group consisting of palladium, silver, iridium, platinum, and gold.
- 12. The method according to claim 10, wherein said metal of said semitransparent layer is selected from the group consisting of chromium, iron, cobalt, nickel, molybdenum, and tungsten.
Priority Claims (1)
Number |
Date |
Country |
Kind |
198 27 222 |
Jun 1998 |
DE |
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CROSS-REFERENCE TO RELATED APPLICATION
This application is a division of U.S. application Ser. No. 09/335,565, filed Jun. 18, 1999 U.S. Pat. No. 6,262,441.
US Referenced Citations (11)