Electroluminescent element
Patent 5281489 Issued on January 25, 1994. Estimated Expiration Date: 
September 16, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 16, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3172862 3173050 Radiation sources Organic electroluminescent cell Organic electroluminescent devices having improved power conversion efficiencies Electroluminescent device with organic luminescent medium Electroluminescent device Vacuum column web loop position sensing system Patent #: 4762292 InventorsAssigneeApplicationNo. 760190 filed on 09/16/1991US Classes:428/690, Fluroescent, phosphorescent, or luminescent layer313/498, Solid-state type313/503, With particular phosphor or electrode material313/504, Organic phosphor313/506, Plural layers313/507, With photosensitive layer428/691, Halogen-containing428/917ELECTROLUMINESCENTExaminersPrimary: Robinson, Ellis P.Assistant: Nold, Charles Attorney, Agent or FirmForeign Patent References
International ClassH05B 033/14AbstractDisclosed is an electroluminescent element comprising an anode, a cathode and, disposed therebetween, an organic luminescent layer comprising a mixture of a fluorescent luminescent agent, at least one hole moving and donating agent capable of moving holes and donating the same to the luminescent agent and at least one electron moving and donating agent capable of moving electrons and donating the same to the luminescent agent. In the element, the components of the luminescent layer have specific oxidation potential and reduction potential relationships. The element emits light in response to electrical signals. The element exhibits high luminescence efficiency and brightness even at low voltages, and it can efficiently be produced at low cost.Other References
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