Long operating life for polymer light-emitting diodes
US5798170A · kind A · utility
110Cited by
3References
15Claims
0Family size
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Key dates
| Filing date | Feb 29, 1996 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | Feb 29, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.