WO2008150940A1 - Chrysenes for green luminescent applications - Google Patents
Chrysenes for green luminescent applications Download PDFInfo
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- WO2008150940A1 WO2008150940A1 PCT/US2008/065187 US2008065187W WO2008150940A1 WO 2008150940 A1 WO2008150940 A1 WO 2008150940A1 US 2008065187 W US2008065187 W US 2008065187W WO 2008150940 A1 WO2008150940 A1 WO 2008150940A1
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- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- 125000001424 substituent group Chemical group 0.000 claims description 10
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 9
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- 125000001037 p-tolyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1*)C([H])([H])[H] 0.000 description 1
- CBHCDHNUZWWAPP-UHFFFAOYSA-N pecazine Chemical compound C1N(C)CCCC1CN1C2=CC=CC=C2SC2=CC=CC=C21 CBHCDHNUZWWAPP-UHFFFAOYSA-N 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 150000005041 phenanthrolines Chemical class 0.000 description 1
- 229910000073 phosphorus hydride Inorganic materials 0.000 description 1
- 230000036211 photosensitivity Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003227 poly(N-vinyl carbazole) Polymers 0.000 description 1
- 229920000548 poly(silane) polymer Polymers 0.000 description 1
- 229920000172 poly(styrenesulfonic acid) Polymers 0.000 description 1
- 229920001798 poly[2-(acrylamido)-2-methyl-1-propanesulfonic acid] polymer Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003252 quinoxalines Chemical class 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007764 slot die coating Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000104 sodium hydride Inorganic materials 0.000 description 1
- 239000012312 sodium hydride Substances 0.000 description 1
- 238000010129 solution processing Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 1
- 150000004867 thiadiazoles Chemical class 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- 125000005259 triarylamine group Chemical group 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/622—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing four rings, e.g. pyrene
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C255/00—Carboxylic acid nitriles
- C07C255/49—Carboxylic acid nitriles having cyano groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
- C07C255/58—Carboxylic acid nitriles having cyano groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton containing cyano groups and singly-bound nitrogen atoms, not being further bound to other hetero atoms, bound to the carbon skeleton
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/151—Copolymers
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/626—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
- H10K85/633—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2603/00—Systems containing at least three condensed rings
- C07C2603/02—Ortho- or ortho- and peri-condensed systems
- C07C2603/40—Ortho- or ortho- and peri-condensed systems containing four condensed rings
- C07C2603/42—Ortho- or ortho- and peri-condensed systems containing four condensed rings containing only six-membered rings
- C07C2603/48—Chrysenes; Hydrogenated chrysenes
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2603/00—Systems containing at least three condensed rings
- C07C2603/56—Ring systems containing bridged rings
- C07C2603/86—Ring systems containing bridged rings containing four rings
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1003—Carbocyclic compounds
- C09K2211/1011—Condensed systems
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1003—Carbocyclic compounds
- C09K2211/1014—Carbocyclic compounds bridged by heteroatoms, e.g. N, P, Si or B
Definitions
- This invention relates to electroluminescent chrysene compounds which have green emission. It also relates to electronic devices in which the active layer includes such a chrysene compound. Description of the Related Art Organic electronic devices that emit light, such as light-emitting diodes that make up displays, are present in many different kinds of electronic equipment. In all such devices, an organic active layer is sandwiched between two electrical contact layers. At least one of the electrical contact layers is light-transmitting so that light can pass through the electrical contact layer. The organic active layer emits light through the light-transmitting electrical contact layer upon application of electricity across the electrical contact layers.
- organic electroluminescent compounds As the active component in light-emitting diodes. Simple organic molecules such as anthracene, thiadiazole derivatives, and coumarin derivatives are known to show electroluminescence. Semiconductive conjugated polymers have also been used as electroluminescent components, as has been disclosed in, for example, U.S. Patent 5,247,190, U.S. Patent 5,408,109, and Published European Patent Application 443 861. However, there is a continuing need for electroluminescent compounds, especially compounds that are green-emitting.
- Ar1 and Ar3 are the same or different and are aryl, and at least one of Ari and Ar3 has at least one alkyl substituent, with the proviso that there are no electron-withdrawing substituents;
- Ar2 and Ar4 are the same or different and are aryl, with the proviso that there are no electron-withdrawing substituents;
- R1 , R2, and R4 are the same or different and are selected from the group consisting of H and an electron-withdrawing group;
- R3 is an electron-withdrawing group;
- R5 and R7 through R11 are the same or different and are selected from the group consisting of H and alkyl; wherein said compound is capable of emitting green light.
- an electronic device comprising an active layer comprising the compound of Formula I.
- FIG. 1 includes an illustration of one example of an organic electronic device.
- the term "compound” is intended to mean an electrically uncharged substance made up of molecules that further consist of atoms, wherein the atoms cannot be separated by physical means.
- the phrase "adjacent to,” when used to refer to layers in a device, does not necessarily mean that one layer is immediately next to another layer.
- the phrase “adjacent R groups,” is used to refer to R groups that are next to each other in a chemical formula (i.e., R groups that are on atoms joined by a bond).
- photoactive refers to any material that exhibits electroluminescence and/or photosensitivity.
- the term “electron withdrawing” as it refers to a substituent group is intended to mean a group which decreases the electron density of an aromatic ring.
- aryl is intended to mean a group derived from an aromatic hydrocarbon having one point of attachment.
- the term includes groups which have a single ring and those which have multiple rings which can be joined by a single bond or fused together.
- the term is intended to include heteroaryls.
- arylene is intended to mean a group derived from an aromatic hydrocarbon having two points of attachment. In some embodiments, an aryl group has from 3-60 carbon atoms.
- alkyl is intended to mean a group derived from an aliphatic hydrocarbon having one point of attachment, and includes a linear, a branched, or a cyclic group.
- the term is intended to include heteroalkyls.
- alkylene is intended to mean a group derived from an aliphatic hydrocarbon and having two or more points of attachment. In some embodiments, an alkyl group has from 1-20 carbon atoms.
- binaphthyl is intended to mean a group having two naphthalene units joined by a single bond.
- the binaphthyl group is 1 ,1 -binaphthyl, which is attached at the 3-, 4-, or 5- position; in some embodiments, 1 ,2-binaphthyl, which is attached at the 3-, A-, or 5-position on the 1-naphthyl moiety, or the 4- or 5-position on the 2-naphthyl moiety; and in some embodiments, 2,2-binaphthyl, which is attached at the 4- or 5-position.
- biphenyl is intended to mean a group having two phenyl units joined by a single bond. The phenyl group can be attached at the 3-, 4-, or 5-position.
- fluoro indicates that one or more hydrogen atoms have been replaced with a fluorine atom.
- green refers to radiation that has an emission maximum at a wavelength in a range of approximately 500-600 nm.
- hetero indicates that one or more carbon atoms have been replaced with a different atom.
- the different atom is N, O, or S. All groups may be unsubstituted or substituted, unless otherwise indicated.
- the substituents are selected from the group consisting of alkyl, alkoxy, and aryl.
- layer is used interchangeably with the term “film” and refers to a coating covering a desired area. The term is not limited by size. The area can be as large as an entire device or as small as a specific functional area such as the actual visual display, or as small as a single sub-pixel.
- Layers and films can be formed by any conventional deposition technique, including vapor deposition, liquid deposition (continuous and discontinuous techniques), and thermal transfer.
- Continuous deposition techniques include but are not limited to, spin coating, gravure coating, curtain coating, dip coating, slot-die coating, spray coating, and continuous nozzle coating.
- Discontinuous deposition techniques include, but are not limited to, ink jet printing, gravure printing, and screen printing.
- organic electronic device or sometimes just “electronic device,” is intended to mean a device including one or more organic semiconductor layers or materials.
- One aspect of the present invention is a compound of Formula I:
- Ari and Ar3 are the same or different and are aryl, and at least one of Ari and Ar3 has at least one alkyl substituent, with the proviso that there are no electron-withdrawing substituents;
- Ar2 and Ar4 are the same or different and are aryl, with the proviso that there are no electron-withdrawing substituents;
- R1 , R2, and R4 are the same or different and are selected from the group consisting of H and an electron-withdrawing group;
- R3 is an electron-withdrawing group;
- R5 and R7 through R11 are the same or different and are selected from the group consisting of H and alkyl.
- the compound is capable of green emission.
- the electron-withdrawing group is selected from the group consisting of fluoro, perfluoroalkyl, cyano, nitro, — SO2R, where R is alkyl or perfluoroalkyl, and combinations thereof. In some embodiments, the EWG is thfluoromethyl or cyano.
- both R1 and R3 are EWGs.
- R2, R5, and R7 through R11 are H.
- Ar1 through Ar4 are independently selected from the group consisting of phenyl, biphenyl, naphthyl, and binaphthyl. In some embodiments, at least one of Ar1 through Ar4 is substituted with C1 -20 alkyl. In some embodiments, the alkyl is branched.
- Ar1 and Ar3 are phenyl groups. In some embodiments, the phenyl groups have 1 -5 alkyl substituents. In some embodiments, at least one of Ar2 and Ar4 has at least one alkyl substituent. In some embodiments, the alkyl group has 1-8 carbon atoms. In some embodiments, both Ar2 and Ar4 are selected from the group consisting of phenyl and biphenyl.
- Ar1 and Ar3 are phenyl groups having at least one alkyl substituent and Ar2 and Ar4 are biphenyl groups having at least one alkyl substituent.
- the green chrysene compound has Formula E1 :
- the new chrysenes can be prepared by known coupling and substitution reactions.
- An exemplary preparation is given in the Examples.
- the chrysene compounds described herein can be formed into films using liquid deposition techniques. Thin films of these materials dispersed in a host matrix exhibit good to excellent photoluminescent properties and green emission. 3. Electronic Device
- Organic electronic devices that may benefit from having one or more layers comprising the green luminescent materials described herein include, but are not limited to, (1 ) devices that convert electrical energy into radiation (e.g., a light-emitting diode, light emitting diode display, or diode laser), (2) devices that detect signals through electronics processes (e.g., photodetectors, photoconductive cells, photoresistors, photoswitches, phototransistors, phototubes, IR detectors), (3) devices that convert radiation into electrical energy, (e.g., a photovoltaic device or solar cell), and (4) devices that include one or more electronic components that include one or more organic semi-conductor layers (e.g., a transistor or diode).
- (1 ) devices that convert electrical energy into radiation e.g., a light-emitting diode, light emitting diode display, or diode laser
- devices that detect signals through electronics processes e.g., photodetectors, photoconductive cells, photoresistors,
- the device 100 has a first electrical contact layer, an anode layer 110 and a second electrical contact layer, a cathode layer 160, and a photoactive layer 140 between them.
- Adjacent to the anode is a buffer layer 120.
- Adjacent to the buffer layer is a hole transport layer 130, comprising hole transport material.
- Adjacent to the cathode may be an electron transport layer 150, comprising an electron transport material.
- devices may use one or more additional hole injection or hole transport layers (not shown) next to the anode 110 and/or one or more additional electron injection or electron transport layers (not shown) next to the cathode 160.
- Layers 120 through 150 are individually and collectively referred to as the active layers.
- the different layers have the following range of thicknesses: anode 110, 500-5000 A, in one embodiment 1000-2000 A; buffer layer 120, 50-2000 A, in one embodiment 200-1000 A; hole transport layer 130, 50-2000 A, in one embodiment 200-1000 A; photoactive layer 140, 10-2000 A, in one embodiment 100-1000 A; layer 150, 50-2000 A, in one embodiment 100-1000 A; cathode 160, 200-10000 A, in one embodiment 300-5000 A.
- the location of the electron-hole recombination zone in the device, and thus the emission spectrum of the device can be affected by the relative thickness of each layer.
- the desired ratio of layer thicknesses will depend on the exact nature of the materials used.
- the photoactive layer 140 can be a light-emitting layer that is activated by an applied voltage (such as in a light-emitting diode or light-emitting electrochemical cell), or a layer of material that responds to radiant energy and generates a signal with or without an applied bias voltage (such as in a photodetector).
- an applied voltage such as in a light-emitting diode or light-emitting electrochemical cell
- a layer of material that responds to radiant energy and generates a signal with or without an applied bias voltage
- Examples of photodetectors include photoconductive cells, photoresistors, photoswitches, phototransistors, and phototubes, and photovoltaic cells, as these terms are described in Markus, John, Electronics and Nucleonics Dictionary, 470 and 476 (McGraw-Hill, Inc. 1966).
- the chrysene compounds of Formula I are useful as photoactive materials in layer 140.
- the compounds can be used alone, or in combination with a host material.
- the host is a bis-condensed cyclic aromatic compound.
- the host is an anthracene derivative compound.
- the compound has the formula: An - L- An where:
- An is an anthracene moiety; L is a divalent connecting group.
- L is a single bond, -O-, -S-, - N(R)-, or an aromatic group.
- An is a mono- or diphenylanthryl moiety.
- the host has the formula: A - An - A where: An is an anthracene moiety;
- A is the same or different at each occurrence and is an aromatic group.
- the A groups are attached at the 9- and 10- positions of the anthracene moiety.
- A is selected from the group consisting naphthyl, naphthylphenylene, and naphthylnaphthylene.
- the compound is symmetrical and in some embodiments the compound is non-symmetrical.
- the host has the formula:
- the host is selected from the group consisting of H1
- chrysene compounds of Formula I in addition to being useful as emissive dopants in the photoactive layer, can also act as charge carrying hosts for other emissive dopants in the photoactive layer 140. b. Other Device Layers
- the other layers in the device can be made of any materials that are known to be useful in such layers.
- the anode 110 is an electrode that is particularly efficient for injecting positive charge carriers. It can be made of, for example, materials containing a metal, mixed metal, alloy, metal oxide or mixed- metal oxide, or it can be a conducting polymer, or mixtures thereof. Suitable metals include the Group 11 metals, the metals in Groups 4-6, and the Group 8-10 transition metals. If the anode is to be light- transmitting, mixed-metal oxides of Groups 12, 13 and 14 metals, such as indium-tin-oxide, are generally used.
- the anode 110 can also comprise an organic material such as polyaniline as described in "Flexible light- emitting diodes made from soluble conducting polymer," Nature vol. 357, pp 477-479 (11 June 1992). At least one of the anode and cathode is desirably at least partially transparent to allow the generated light to be observed.
- the buffer layer 120 comprises buffer material and may have one or more functions in an organic electronic device, including but not limited to, planahzation of the underlying layer, charge transport and/or charge injection properties, scavenging of impurities such as oxygen or metal ions, and other aspects to facilitate or to improve the performance of the organic electronic device.
- Buffer materials may be polymers, oligomers, or small molecules. They may be vapour deposited or deposited from liquids which may be in the form of solutions, dispersions, suspensions, emulsions, colloidal mixtures, or other compositions.
- the buffer layer can be formed with polymeric materials, such as polyaniline (PANI) or polyethylenedioxythiophene (PEDOT), which are often doped with protonic acids.
- the protonic acids can be, for example, poly(styrenesulfonic acid), poly(2-acrylamido-2-methyl-1 -propanesulfonic acid), and the like.
- the buffer layer can comprise charge transfer compounds, and the like, such as copper phthalocyanine and the tetrathiafulvalene- tetracyanoquinodimethane system (TTF-TCNQ).
- the buffer layer comprises at least one electrically conductive polymer and at least one fluorinated acid polymer.
- Such materials have been described in, for example, published U.S. patent applications 2004-0102577, 2004-0127637, and 2005/205860 Examples of hole transport materials for layer 130 have been summarized for example, in Kirk-Othmer Encyclopedia of Chemical Technology, Fourth Edition, Vol. 18, p. 837-860, 1996, by Y. Wang. Both hole transporting molecules and polymers can be used.
- hole transporting molecules are: N,N'-diphenyl-N,N'-bis(3-methylphenyl)- [1 ,1'-biphenyl]-4,4'-diamine (TPD), 1 ,1 -bis[(di-4-tolylamino) phenyl]cyclohexane (TAPC), N,N'-bis(4-methylphenyl)-N,N'-bis(4- ethylphenyl)-[1 ,1 '-(3,3'-dimethyl)biphenyl]-4,4'-diamine (ETPD), tetrakis-(3- methylphenyl)-N,N,N',N'-2,5-phenylenediamine (PDA), a-phenyl-4-N,N- diphenylaminostyrene (TPS), p-(diethylamino)benzaldehyde diphenylhydrazone (DEH),
- hole transporting polymers are polyvinylcarbazole, (phenylmethyl)- polysilane, and polyaniline. It is also possible to obtain hole transporting polymers by doping hole transporting molecules such as those mentioned above into polymers such as polystyrene and polycarbonate. In some cases, triarylamine polymers are used, especially tharylamine-fluorene copolymers. In some cases, the polymers and copolymers are crosslinkable.
- additional electron transport materials which can be used in layer 150 include metal chelated oxinoid compounds, such as tris(8-hydroxyquinolato)aluminum (Alq3); bis(2-methyl-8- quinolinolato)(para-phenyl-phenolato)aluminum(lll) (BAIQ); and azole compounds such as 2-(4-biphenylyl)-5-(4-t-butylphenyl)-1 ,3,4-oxadiazole (PBD) and 3-(4-biphenylyl)-4-phenyl-5-(4-t-butylphenyl)-1 ,2,4-triazole (TAZ), and 1 ,3,5-th(phenyl-2-benzinnidazole)benzene (TPBI); quinoxaline derivatives such as 2,3-bis(4-fluorophenyl)quinoxaline; phenanthroline derivatives such as 9,10-diphenylphenanthroline (DPA) and 2,5
- the cathode 160 is an electrode that is particularly efficient for injecting electrons or negative charge carriers.
- the cathode can be any metal or nonmetal having a lower work function than the anode.
- Materials for the cathode can be selected from alkali metals of Group 1 (e.g., Li, Cs), the Group 2 (alkaline earth) metals, the Group 12 metals, including the rare earth elements and lanthanides, and the actinides.
- Li-containing organometallic compounds, LiF, and Li 2 O can also be deposited between the organic layer and the cathode layer to lower the operating voltage. It is known to have other layers in organic electronic devices. For example, there can be a layer (not shown) between the anode 110 and buffer layer 120 to control the amount of positive charge injected and/or to provide band-gap matching of the layers, or to function as a protective layer.
- Layers that are known in the art can be used, such as copper phthalocyanine, silicon oxy-nitride, fluorocarbons, silanes, or an ultra-thin layer of a metal, such as Pt.
- a metal such as Pt.
- anode layer 110, active layers 120, 130, 140, and 150, or cathode layer 160 can be surface-treated to increase charge carrier transport efficiency.
- the choice of materials for each of the component layers is preferably determined by balancing the positive and negative charges in the emitter layer to provide a device with high electroluminescence efficiency.
- each functional layer can be made up of more than one layer.
- the device can be prepared by a variety of techniques, including sequential vapor deposition of the individual layers on a suitable substrate. Substrates such as glass, plastics, and metals can be used. Conventional vapor deposition techniques can be used, such as thermal evaporation, chemical vapor deposition, and the like.
- the organic layers can be applied from solutions or dispersions in suitable solvents, using conventional coating or printing techniques, including but not limited to spin-coating, dip-coating, roll-to-roll techniques, ink-jet printing, screen- printing, gravure printing and the like.
- the different layers will have the following range of thicknesses: anode 110, 500-5000A, preferably 1000-2000A; hole transport layer
- the present invention also relates to an electronic device comprising at least one active layer positioned between two electrical contact layers, wherein the at least one layer of the device includes the chrysene compound of Formula 1. Devices frequently have additional hole transport and electron transport layers.
- the HOMO (highest occupied molecular orbital) of the hole transport material desirably aligns with the work function of the anode
- the LUMO (lowest un-occupied molecular orbital) of the electron transport material desirably aligns with the work function of the cathode.
- Chemical compatibility and sublimation temperature of the materials are also important considerations in selecting the electron and hole transport materials.
- the efficiency of devices made with the chrysene compounds described herein can be further improved by optimizing the other layers in the device.
- more efficient cathodes such as Ca, Ba or LiF can be used.
- Shaped substrates and novel hole transport materials that result in a reduction in operating voltage or increase quantum efficiency are also applicable.
- Additional layers can also be added to tailor the energy levels of the various layers and facilitate electroluminescence.
- the chrysene compounds of the invention often are fluorescent and photoluminescent and can be useful in applications other than OLEDs, such as oxygen sensitive indicators and as fluorescent indicators in bioassays.
- Example 1 This example illustrates the preparation of Compound E1 , 6,12- bis((4-fe/t-butylphenyl)(3,4-dimethylphenyl)amino)chrysene-3-carbonitrile
- Tris(te/t-butyl)phosphine (0.056 g, 0.28 mmol) and ths(dibenzylideneacetone)dipalladium(0) (0.127 g, 0.14 mmol) were added next, followed by sodium te/t-butoxide (0.797 g, 8.29 mmol) and 10 ml of dry toluene.
- Glass tube was sealed, brought out of the box and placed into a 100 0 C oil bath for 24 hours. Reaction mixture was cooled to room temperature, diluted with 100 ml of dichloromethane and filtered through a plug of celite and silica. The plug was washed with additional 200 ml of dichloromethane.
- Example 2 This example demonstrates the fabrication and performance of a device having green emission. The following materials were used:
- ITO Indium Tin Oxide
- buffer layer Buffer 1 (25 nm), which is an aqueous dispersion of polypyrrole and a polymeric fluorinated sulfonic acid.
- the material was prepared using a procedure similar to that described in Example 1 of published U.S. patent application no. 2005/0205860.
- hole transport layer polymer P1 (20 nm)
- photoactive layer 13:1 host H2:dopant
- electron transport layer Tetrakis-( ⁇ -hydroxyquinoline) zirconium (ZrQ) (20 nm)
- cathode LiF/AI (0.5/100 nm)
- OLED devices were fabricated by a combination of solution processing and thermal evaporation techniques.
- Patterned indium tin oxide (ITO) coated glass substrates from Thin Film Devices, lnc were used. These ITO substrates are based on Corning 1737 glass coated with ITO having a sheet resistance of 30 ohms/square and 80% light transmission.
- the patterned ITO substrates were cleaned ultrasonically in aqueous detergent solution and rinsed with distilled water.
- the patterned ITO was subsequently cleaned ultrasonically in acetone, rinsed with isopropanol, and dried in a stream of nitrogen.
- ITO substrates were treated with UV ozone for 10 minutes.
- an aqueous dispersion of Buffer 1 was spin-coated over the ITO surface and heated to remove solvent.
- the substrates were then spin-coated with a solution of a hole transport material, and then heated to remove solvent.
- the substrates were spin-coated with the emissive layer solution, and heated to remove solvent.
- the substrates were masked and placed in a vacuum chamber.
- a ZrQ layer was deposited by thermal evaporation, followed by a layer of LiF.
- Masks were then changed in vacuo and a layer of Al was deposited by thermal evaporation.
- the chamber was vented, and the devices were encapsulated using a glass lid, dessicant, and UV curable epoxy.
- the OLED samples were characterized by measuring their
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Abstract
Description
Claims
Priority Applications (3)
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EP08769836A EP2150599B1 (en) | 2007-06-01 | 2008-05-30 | Chrysenes for green luminescent applications |
CN2008800167106A CN101679853B (en) | 2007-06-01 | 2008-05-30 | Chrysenes for green luminescent applications |
JP2010510499A JP5401449B2 (en) | 2007-06-01 | 2008-05-30 | Chrysene for green light emitting applications |
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US94135107P | 2007-06-01 | 2007-06-01 | |
US60/941,351 | 2007-06-01 |
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US (1) | US20080303428A1 (en) |
EP (1) | EP2150599B1 (en) |
JP (1) | JP5401449B2 (en) |
KR (1) | KR20100024451A (en) |
CN (1) | CN101679853B (en) |
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Also Published As
Publication number | Publication date |
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CN101679853A (en) | 2010-03-24 |
US20080303428A1 (en) | 2008-12-11 |
JP5401449B2 (en) | 2014-01-29 |
EP2150599B1 (en) | 2012-11-28 |
KR20100024451A (en) | 2010-03-05 |
EP2150599A1 (en) | 2010-02-10 |
CN101679853B (en) | 2013-10-30 |
JP2010529036A (en) | 2010-08-26 |
TW200907022A (en) | 2009-02-16 |
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