Polymer light-emitting devices: Light-emitting diodes and light-emitting electrochemical cells

Conference · Tue Oct 01 00:00:00 EDT 1996

OSTI ID:370695

Heeger, A J ^[1]; Cao, Y; Pei, Q; Yu, G ^[2]

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1. Institute for Polymers and Organic Solids, Santa Barbara, CA (United States)
2. UNIAX Corp., Santa Barbara, CA (United States); and others

We will summarize recent progress using two different device configurations: tunneling injection light-emitting diodes (LEDs) and light-emitting electrochemical cells (LECs). In the LEC, a p-n junction diode is created in-situ through simultaneous p-type and n-type electrochemical doping on opposite sides, respectively, of a film of conjugated polymer which contains added electrolyte to provide the necessary counterions for doping. Blue, green and orange emitting LECs have been fabricated. The LEC has been used to directly measure the charge injection energy gap in semiconducting polymers. Simultaneous measurements of the onset of electrochemical doping, electrical injection, and electroluminescence from light-emitting electrochemical cells eliminates the uncertainty in the magnitude of the exciton binding energy; the LEC data are consistent with the semiconductor model in which the exciton binding energy is at most a few times k{sub B}T (at room temperature).

• OSTI ID: 370695
• Report Number(s): CONF-960376--
• Resource Type: Conference proceedings
• Conference Information: Spring national meeting of the American Chemical Society (ACS), New Orleans, LA (United States), 24-28 Mar 1996; Is Part Of 211th ACS national meeting; PB: 2284 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BINDING ENERGY
ELECTROCHEMICAL CELLS
ELECTROLUMINESCENCE
ENERGY GAP
LIGHT EMITTING DIODES
POLYMERS
SEMICONDUCTOR MATERIALS