Electrochemical light-emitting devices

Details Electrochemical light-emitting devices Electrochemical light-emitting devices

1995-11-08

1999-04-20

Yaminitzky, Marie

Stock material or miscellaneous articles

Composite

428457, 428690, 428917, 313502, 313504, 313506, 257 40, 257102, 257103, H05B 3300

Patent

active

058957170

ABSTRACT:
Electrochemical light emitting devices are disclosed which include a composite material in contact with two electrodes. The composite material is an admixture of ionic species and an `immobile` semiconductor and a high-boiling gel-forming liquid. The presence of high-boiling gel-forming liquid improves the efficiency of the devices. The semiconductor is capable of supporting both p- and n-type carriers and having a doping profile which can be dynamically changed in a controlled fashion through reversible electrochemical oxidation and reduction. Devices having this structure may be used to generate electrochemically induced p-n junctions, thereby providing a new means of exploiting the light emitting properties of such junctions under an applied voltage. Systems and methods for generating useful levels of light employing these devices are also disclosed.

REFERENCES:
patent: 3900418 (1975-08-01), Bard et al.
patent: 4517490 (1985-05-01), Takahashi et al.
patent: 4539507 (1985-09-01), VanSlyke et al.
patent: 5189549 (1993-02-01), Leventis et al.
patent: 5247190 (1993-09-01), Friend et al.
patent: 5682043 (1997-10-01), Pei et al.

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