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US 6,534,329 B2Granted
Visible light emitting diodes fabricated from 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.
Claims19
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) casting a free-standing film of a soluble semiconducting luminescent conjugated polymer, said film having a first side and a second side;
- ii) coating said first side of said free-standing film with a transparent conducting first layer, said first layer having high work function and serving as a hole-injecting electrode;
- and
- iii) fabricating onto said second side of said free-standing film from a low work function metal, an electron-injecting contact.
1 more element
Dependencies are inferred from the claim text.