Long operating life for polymer light-emitting diodes
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United States of America Patent
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Aug 25, 1998
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app pub date -
Feb 29, 1996
filing date -
Feb 29, 1996
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Abstract
Long-lived organic light-emitting diodes are achieved by positioning a layer comprising polyaniline in the emeraldine salt form directly contiguous with the anode side of the active light-emitting layer. Particular advantages are achieved if the emeraldine salt-containing layer has a sheet resistance of at least about 10.sup.3 ohms per square which can be achieved by casting the layer from solution in a polar solvent, most particularly, DMSO. The LED's can find advantageous application in displays where they exhibit long life and marked resistance to blurring, spreading or other degradations over time.
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