Electroluminescent device with modified thin film luminescent zone
First Claim
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1. An organic electroluminescent device comprising in sequence, an anode, an organic hole injecting and transporting zone, a luminescent zone, and a cathode,characterized in thatsaid luminescent zone is formed of a thin film of less than 1 μ
- m in thickness comprised ofan organic host material forming a layer capable of sustaining both hole and electron injection andlocated in said layer as a fluorescent material a dye capable of emitting light in response to hole-electron recombination, said dye having a bandgap no greater than that of said host material and a reduction potential less negative than that of said host material.
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Abstract
An electroluminescent device is disclosed having a luminescent zone of less than one μm in thickness comprised of an organic host material capable of sustaining hole-electron recombination and a fluorescent material capable of emitting light in response to energy released by hole-electron recombination.
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Citations
19 Claims
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1. An organic electroluminescent device comprising in sequence, an anode, an organic hole injecting and transporting zone, a luminescent zone, and a cathode,
characterized in that said luminescent zone is formed of a thin film of less than 1 μ - m in thickness comprised of
an organic host material forming a layer capable of sustaining both hole and electron injection and located in said layer as a fluorescent material a dye capable of emitting light in response to hole-electron recombination, said dye having a bandgap no greater than that of said host material and a reduction potential less negative than that of said host material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- m in thickness comprised of
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12. An organic electroluminescent device comprising in sequence, an anode, an organic luminescent medium, and a cathode,
characterized in that said organic luminescent medium is less than 5000 Angstroms in thickness and is comprised of an electron injecting and transporting layer containing an organic host material capable of sustaining both hole and electron injection and located in said layer as a fluorescent material a dye chosen to provide favored sites for light emission having a bandgap no greater than that of said host material and a reduction potential less negative than that of said host material.
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18. An organic electroluminescent device comprising in sequence
an anode formed of one or more metals having a work function of greater than 4 eV, a cathode formed of a combination of metals, with one or more metals other than alkali metals having a work function of less than 4 eV accounting for greater than 50 percent on an atomic basis of the total cathode metals, and, interposed between said anode and cathode, an organic luminescent medium consisting of an organic hole injecting zone and a luminescent zone, said organic luminescent medium being less than 5000 Angstroms in thickness and comprised of an electron injecting and transporting layer containing an organic host material capable of sustaining both hole and electron injection and located in said layer as an optically coupled fluorescent material chosen to provide favored sites for light emission a dye having a bandgap no greater than that of said host material and a reduction potential less negative than that of said host material and a hole injecting and transporting zone comprised of a tetraphenyldiamine layer contacting said electron injecting and transporting zone, a hole injecting porphyrinic compound containing layer contacting said anode, and a triphenylamine layer interposed between said tetraphenyldiamine layer and porphyrinic compound.
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19. An organic electroluminescent device comprising in sequence
an anode, a cathode containing magnesium and a minor amount of another metal chosen from the class consisting of aluminum, copper, silver, gold, tin, lead, bismuth, tellurium, indium, and antimony, at least one of said anode and said cathode being light transmissive, and, interposed between said anode and said cathode, an organic luminescent medium consisting of an organic hole injecting zone and a luminescent zone, said organic luminescent medium being less than 5000 Angstroms in thickness and comprised of a hole injecting layer containing a phthalocyanine in contact with said anode, a first hole transporting layer containing a bis-triphenylamine, a second hole transporting layer containing a tetraphenyldiamine, and a luminescent zone containing a metal chelated 8-hydroxyquinoline host material and a fluorescent dye capable of absorbing light at the emission wavelength of said metal chelated 8-hydroxyquinoline, having a lower bandgap and a less negative reduction potential than said chelated 8-hydroxyquinoline.
Specification