Fabrication of visible light emitting diodes soluble semiconducting polymers
AssigneeThe Regents of the University of California
InventorsAlan J. Heeger, David Braun
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Abstract
Visible light LEDs are produced having a layer of conjugated polymer which is cast directly from solution or formed as a gel-processed admixture with a carrier polymer. The LEDs can be formed so as to emit polarized light.
Claims73
A process for fabrication of a light-emitting diode which emits visible light and which turns on at voltages below 5 volts, which process comprises the steps of:
- i) precoating a substrate with a transparent conducting first layer, said first layer having high work function and serving as a hole-injecting electrode;
- ii) casting upon said first layer directly from solution, a transparent layer of a soluble semiconducting luminescent conjugated polymer;
- and
- iii) fabricating onto the semiconducting conjugated polymer layer from a low work function metal, an electron-injecting contact.
A process for fabrication of a light-emitting diode which emits visible light and which turns on at voltages below 5 volts, which process comprises the steps of:
- i) precoating a substrate with a transparent conducting first layer, said first layer having high work function and serving as a hole-injecting electrode;
- ii) casting upon said first layer directly from solution, a transparent layer of a soluble semiconducting luminescent conjugated polymer;
- and
- iii) fabricating onto the semiconducting conjugated polymer layer from calcium or a lower work function alkaline earth metal, an electron-injecting contact.
A process for fabrication of a light-emitting diode which emits visible light and which turns on at voltages below 5 volts, which process comprises the steps of:
- i) precoating a substrate with a transparent conducting first layer, said first layer having high work function and serving as a hole-injecting electrode;
- ii) casting upon said first layer directly from solution, a transparent layer of a soluble semiconducting luminescent conjugated polymer;
- and
- iii) fabricating onto the semiconducting conjugated polymer layer from calcium, an electron-injecting contact.
A process for fabrication of a light-emitting diode which emits visible light and which turns on at voltages below 5 volts, which process comprises the steps of:
- i) precoating a substrate with a transparent conducting first layer, said first layer having high work function and serving as a hole-injecting electrode;
- ii) casting upon said first layer directly from solution, a transparent layer of a soluble semiconducting luminescent conjugated polymer;
- and
- iii) fabricating onto the semiconducting conjugated polymer layer from barium, an electron-injecting contact.
A process for fabrication of a light-emitting diode which emits visible light and which turns on at voltages below 5 volts, which process comprises the steps of:
- i) precoating a substrate with a transparent conducting first layer, said first layer having high work function and serving as a hole-injecting electrode;
- ii) casting upon said first layer directly from solution, a transparent layer of a soluble semiconducting luminescent conjugated polymer selected from the group of poly(phenylenevinylene) and alkoxy derivatives thereof;
- and
- iii) fabricating onto the semiconducting conjugated polymer layer from calcium or a lower work function alkaline earth metal, an electron-injecting contact.
A process for fabrication of a light-emitting diode which emits visible light and which turns on at voltages below 5 volts, which process comprises the steps of:
- i) precoating a substrate with a transparent conducting first layer, said first layer having high work function and serving as a hole-injecting electrode;
- ii) casting upon said first layer directly from solution, a transparent layer of a soluble semiconducting luminescent conjugated polymer selected from the group of poly(phenylenevinylene) and alkoxy derivatives thereof;
- and
- iii) fabricating onto the semiconducting conjugated polymer layer from calcium, an electron-injecting contact.
A process for fabrication of a light-emitting diode which emits visible light and which turns on at voltages below 5 volts, which process comprises the steps of:
- i) precoating a substrate with a transparent conducting first layer, said first layer having high work function and serving as a hole-injecting electrode;
- ii) casting upon said first layer directly from solution, a transparent layer of a soluble semiconducting luminescent conjugated polymer selected from the group of poly(phenylenevinylene) and alkoxy derivatives thereof;
- and
- iii) fabricating onto the semiconducting conjugated polymer layer from barium, an electron-injecting contact.
Dependencies are inferred from the claim text.