WO2007123061A1 - 有機発光素子 - Google Patents
有機発光素子 Download PDFInfo
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- WO2007123061A1 WO2007123061A1 PCT/JP2007/058146 JP2007058146W WO2007123061A1 WO 2007123061 A1 WO2007123061 A1 WO 2007123061A1 JP 2007058146 W JP2007058146 W JP 2007058146W WO 2007123061 A1 WO2007123061 A1 WO 2007123061A1
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- Prior art keywords
- emitting device
- donor
- organic light
- layer
- light
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Classifications
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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
-
- 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
- H05B33/20—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
-
- 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
-
- 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]
- H10K50/14—Carrier transporting layers
- H10K50/15—Hole transporting layers
- H10K50/155—Hole transporting layers comprising dopants
-
- 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]
- H10K50/14—Carrier transporting layers
- H10K50/16—Electron transporting layers
- H10K50/165—Electron transporting layers comprising dopants
Definitions
- the present invention relates to an organic light emitting device, and more particularly to an organic EL device.
- EL elements using electroluminescence are highly visible due to self-emission and are completely solid elements, and thus have excellent features such as excellent impact resistance. Therefore, as EL elements in various display devices, The use of is attracting attention.
- This EL device includes an inorganic EL device using an inorganic compound as a light emitting material and an organic EL device using an organic compound.
- the organic EL device particularly reduces the applied voltage significantly.
- it since it is easy to achieve full color and surface light emission with low power consumption is possible, it has been developed as a next-generation light-emitting element.
- Patent Document 1 discloses a light-emitting element having a constituent power of an anode Zn-type organic compound layer Zp-type organic compound layer Z light-emitting layer Z cathode.
- the negative force with a large difference in the affinity level between the n-type organic compound layer and the p-type organic compound layer and the negative force applied to the anode force are also injected into the n-type organic compound. Since it was not transported across the interface to the p-type organic material layer, it was unable to emit light even when a negative bias was applied to the anode of this device.
- Patent Document 2 also discloses a light-emitting element having a compositional force in which an acceptor-containing layer is interposed between a cathode and a light-emitting medium.
- Patent Document 1 WO2005Z109542
- Patent Document 2 Japanese Patent Laid-Open No. 4-230997
- An object of the present invention is to provide an organic light-emitting device that can reduce power consumption, has high efficiency, and has a long lifetime.
- An anode, a light emitting layer, a donor-containing layer, an acceptor-containing layer, and a cathode are provided in this order, and the donor-containing layer contains at least one selected from the group consisting of a donor metal, a donor metal compound, and a donor metal complex.
- Organic light emitting device is provided in this order, and the donor-containing layer contains at least one selected from the group consisting of a donor metal, a donor metal compound, and a donor metal complex.
- the donor metal power is an alkali metal, an alkaline earth metal, or a rare earth metal.
- the organic light-emitting device according to any one of 1 to 7, which has a transmittance power in visible light of 450 to 650 nm of 3 ⁇ 40% or more.
- FIG. 1 is a diagram showing a first embodiment of an organic light-emitting device of the present invention.
- FIG. 2 is a diagram showing a second embodiment of the organic light-emitting device of the present invention.
- the organic light-emitting device of the present invention comprises an anode, a light-emitting layer, a donor-containing layer, an acceptor-containing layer, and a cathode in this order.
- FIG. 1 shows an element configuration of the first embodiment of the organic light-emitting element according to the present invention.
- the organic light-emitting device 1 includes an anode 10, a hole injection layer 20, a hole transport layer 30, a light-emitting layer 40, a donor-containing layer 50, an acceptor-containing layer 60, and a cathode 70 that are stacked in this order. Has a configuration.
- the acceptor-containing layer 60 is a layer that extracts electrons from the cathode 70 (accepts electrons) and transfers them to the donor-containing layer 50.
- a material having a small work function is used as a material of the cathode in order to inject electrons from the cathode to the organic matter.
- a laminate of LiF and A1 is well known as a cathode.
- the work function of A1 is not so small, so the drive voltage is higher than that of LiFZAl.
- an increase in driving voltage can be reduced even without LiF.
- the donor-containing layer 50 is a layer that extracts electrons from the acceptor-containing layer 60 and injects electrons into the light emitting layer 40 (donates electrons). By providing the donor-containing layer 50, it becomes easier to receive electrons from the acceptor layer 60, which is effective in lowering the driving voltage, further increasing the efficiency, and extending the life.
- the acceptor-containing layer 60 is electron transportable, electrons are transported in the direction of the donor-containing layer 50 into the acceptor-containing layer 60 as well. The Further, it is injected from the donor-containing layer 50 toward the light emitting layer 40.
- positive holes are injected from the anode 10 into the hole injection layer 20 and the hole transport layer 30 and further injected into the light emitting layer 40. In the light emitting layer 40, holes and electrons are recombined to emit light.
- the provision of the donor-containing layer 50 can eliminate a large step difference between the light-emitting layer 40 and the acceptor-containing layer 60.
- a high voltage needs to be applied because the difference in the power level between the acceptor-containing layer 60 and the light emitting layer 40 is large. For this reason, in this device configuration, even if a negative bias is applied to the cathode, it cannot emit light well.
- an acceptor-containing layer 60 and a donor-containing layer 50 are provided between the cathode 70 and the light-emitting layer 40, thereby facilitating electron transport and reducing the voltage, efficiency, and life of the organic light-emitting device. Is planned.
- an ultra-thin film such as LiF is used together with ITO. I don't need it.
- the affinity level is determined by subtracting the energy gap from the value of the ionization potential.
- the energy gap can be determined from the wavelength at the edge of the absorption spectrum.
- the ion potential can be measured directly by photoelectron spectroscopy, or can be determined by correcting the electrochemically measured acid potential relative to the reference electrode. In the latter method, for example, when a saturated sweet potato electrode (SCE) is used as a reference electrode, the ionic potential is expressed as follows (Molecular Semiconductors, Springer-Verlag, 1985, p. 98).
- the ion potential is obtained in the same manner as the above-described electrochemical reduction potential force.
- the ionization potential is measured by an atmospheric photoelectron method or an electrochemical method to determine the affinity level.
- the light-emitting layer preferably contains a blue light-emitting component.
- the organic EL device of the present invention may be a top emission type or a bottom emission type. In any type, when light is extracted from the cathode side force, the cathode becomes light transmissive.
- the light transmittance in the visible light region (450 to 650 nm) of the cathode is preferably 50% or more.
- FIG. 2 is a cross-sectional view showing a second embodiment of the organic EL device according to the present invention. This embodiment is different from the first embodiment in that a nother layer 80 is provided between the acceptor-containing layer 60 and the cathode 70.
- the buffer layer is a layer in which charge is generated in the layer itself or in which the charge exists in the layer itself.
- the nofer layer preferably contains a hole transporting material such as a metal oxide or a metal nitride.
- a hole transporting material such as a metal oxide or a metal nitride.
- One of these compounds may be used alone, or two or more thereof may be used in combination.
- the organic light-emitting device of the present invention is not limited to the configuration shown in FIGS.
- the hole transport layer and the hole injection layer are optional layers and can be omitted.
- a transport layer or the like can be provided.
- the donor-containing layer is a layer containing, as a donor, at least one selected from the group in which a donor metal, a donor metal compound, and a donor metal complex force are also selected.
- the donor metal means a metal having a work function of 3.8 eV or less, preferably an alkali metal, an alkaline earth metal and a rare earth metal, more preferably Cs, Li, Na, Sr, K, Mg, 0 which is Ca, Ba, Yb, Eu and Ce
- the donor metal compound is a compound containing the above donor metal, preferably a compound containing alkali metal, alkaline earth metal, or rare earth metal, and more preferably halogenated metal of these metals. It is porridge, oxide, carbonate, borate.
- MO M is a donor metal
- X is 0.5 to 1.5
- MF X is 1 to 3
- M (CO) x is 0.5 to 1.5).
- the donor metal complex is a complex of the above-described donor metal, preferably an alkali metal, alkaline earth metal, or rare earth metal organometallic complex.
- Preferred is an organometallic complex represented by the following formula (I).
- M is a donor metal
- Q is a ligand, preferably a carboxylic acid derivative, a diketone derivative, or a quinoline derivative
- n is an integer of 1 to 4.
- a tandastene turbine [W (hhp)] (hpp: l, 3, 4, 6, 7, 8—hexahydro-1,24-pyrimido described in JP-A-2005-72012 [1, 2
- phthalocyanine compounds whose central metal is an alkali metal or alkaline earth metal described in JP-A-11-345687 can also be used as a donor metal complex.
- the above donors may be used alone or in combination of two or more.
- the content of the donor contained in the donor-containing layer is preferably 1 to the entire layer: a LOO mol 0/0, more preferably 50-100 mol 0/0.
- the donor-containing layer can contain a single substance or a plurality of kinds of substances as long as it is a light-transmitting substance in addition to the above donor. Specifically, the ability to use organic substances such as amine compounds, condensed ring compounds, nitrogen-containing ring compounds, metal complexes, and inorganic substances such as metal oxides, metal nitrides, metal fluorides, carbonates, etc. It is not limited.
- the thickness of the donor-containing layer is preferably 1 to: LOOnm.
- the donor-containing layer is preferably a high resistance layer.
- High resistance makes it possible to suppress electrical conduction in the direction perpendicular to the film thickness.
- the donor-containing layer has a high light transmittance.
- To have light transmittance means that the transmittance of visible light having a wavelength of 450 to 650 nm is 10% or more, preferably 30% or more, more preferably 50% or more.
- a target layer is provided on a flat and light-transmitting substrate, light is irradiated, and the ratio of the intensity of the transmitted light to the intensity of the irradiated light is obtained.
- the electrical resistance that can be determined from the ratio of the intensity of the transmitted light to the intensity of the light irradiated only by the force substrate, preferably has a specific resistance of 10 _1 ⁇ 'cm or more.
- the specific resistance can be determined, for example, by using parallel electrode stripes on a flat insulating substrate and providing a light-transmitting high-resistance layer thereon and measuring current-voltage characteristics.
- the light transmissive high resistance layer may contain a transition metal oxide, a metal complex such as Alq, and the like in addition to the donor.
- the light transmissive high resistance layer includes a mixture of a donor metal element and a transition metal oxide, and more preferably includes a mixture of an alkali metal and MoO (X is 1 to 4).
- the acceptor is an easily reducible organic compound.
- the ease of reduction of a compound can be measured by a reduction potential.
- saturated The reduction potential using a mel (SCE) electrode as a reference electrode is preferably at least 0.8 V, more preferably at least 0.3 V, and particularly preferably the reduction potential of tetracyanquinodimethane (TCNQ) (about OV ) Preference is given to compounds with larger values.
- the acceptor is preferably an organic compound having an electron-withdrawing substituent or an electron-deficient ring.
- Examples of the electron-withdrawing substituent include halogen, CN—, carbo group, aryl group and the like.
- the acceptor is preferably a quinoid derivative, and more preferably a quinodimethane derivative.
- the quinoid derivative preferably includes compounds represented by the following formulas (la) to (li). More preferred are compounds represented by (la) and (lb).
- X is an electron arch I group, and consists of a displacement force of the structure of the following formulas (j) to (p).
- the structure is (j), (k), or (1).
- R 49 to R 52 are each a hydrogen atom, a fluoroalkyl group, an alkyl group, an aryl group or a heterocyclic ring, and R 5 ° and R 51 may form a ring.
- fluoroalkyl group of ⁇ to 48 a trifluoromethyl group and a pentafluoroethyl group are preferable.
- alkoxyl group having 1-8 a methoxy group, an ethoxy group, iso-propoxy group, tert-butoxy group are preferable.
- the alkyl group of ⁇ to 8 is preferably a methyl group, an ethyl group, a propyl group, an isopropyl group, a tert butyl group or a cyclohexenole group.
- aryl group of ⁇ to 48 a phenyl group and a naphthyl group are preferable.
- X is preferably a substituent represented by the following formula.
- R 51 ′ and R 52 ′ are a methyl group, an ethyl group, a propyl group, and a tert-butyl group, respectively.
- quinoid derivative include the following compounds.
- the acceptor preferably has a thin film forming property. That is, the acceptor-containing layer can be formed by vapor deposition.
- a thin film can be formed means that a flat thin film can be formed on a substrate by a general thin film forming method such as vacuum deposition or spin coating.
- a flat thin film (thickness Inn! ⁇ LOOnm) can be produced on a glass substrate.
- flat means that the unevenness of the thin film is small, preferably the surface roughness (Ra) is lOnm or less, more preferably the surface roughness (Ra) is 1.5 nm or less, More preferably, the surface roughness (Ra) is 1 nm or less.
- the surface roughness can be measured with an atomic force microscope (AFM).
- the organic compound having a thin film forming property is preferably an amorphous organic compound, more preferably an amorphous quinodimethane derivative, and further preferably amorphous and having 5 or more CN-groups. It is a quinodimethane derivative.
- (CN) -TCNQ above is a quinodimethane derivative.
- the content of Akuseputa contained in Akuseputa containing layer is preferably 1 to 100 mole 0/0 for the whole layers, and more preferably from 50 to 100 mol 0/0.
- the acceptor-containing layer is capable of containing a hole-transporting and light-transmitting material, but is not necessarily limited thereto.
- the acceptor-containing layer may include a donor so that electrons can be easily injected into the donor-containing layer or holes can be easily transported to the negative electrode.
- This donor is a compound capable of passing electrons to a compound other than the donor included in the receptor-containing layer or a compound included in the adjacent layer.
- Examples of the donor include organic donor compounds such as amine compounds, polyamine compounds, and tandastene complexes in addition to the above donor metals.
- the thickness of the acceptor-containing layer is preferably 1 to 100 nm.
- the acceptor-containing layer when the light is taken out through the acceptor-containing layer, the acceptor-containing layer is light transmissive.
- the transmittance of the acceptor-containing layer in the visible light region is preferably 50% or more, more preferably 80% or more.
- the EL spectrum when a current density of 1 OmAZcm 2 was applied was measured with a spectral radiance meter CS 1000A (manufactured by Koryo Minolta), and the luminous efficiency (unit: cd / A) was calculated.
- the target layer (thickness 1 to lOOnm) is provided on a flat and light-transmitting glass substrate (thickness 0.7 mm), irradiated with light, and the ratio of transmitted light intensity to irradiated light intensity. Further, the value obtained by subtracting the ratio of the intensity of transmitted light to the intensity of light irradiated only by the substrate was defined as the light transmittance. (5) Specific resistance
- Two parallel electrode stripes (gap between electrodes lmm) are provided on a flat insulating substrate, and the target layer (thickness lOOnm) is provided on it, and between -10V to + 10V between the two electrode stripes Measure the current when the voltage is swept, and obtain the specific resistance from the slope of the current-voltage characteristics.
- ITO On a glass substrate having a thickness of 0.7 mm, ITO was deposited to a thickness of 130 nm by sputtering. This substrate was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, followed by UV ozone cleaning for 30 minutes, and then the substrate with the ITO electrode was mounted on the substrate holder of the vacuum deposition apparatus.
- TP D232 is used as the material for the hole injection layer
- TBDB is used as the material for the hole transport layer
- BH is used as the host material for the light emitting layer
- BD is used as the blue light emitting material.
- Alq was attached as an electron transport material, Li as a donor, (CN) TCNQ as an acceptor, and A1 as a cathode material.
- a TPD232 film functioning as a hole injection layer was formed to a thickness of 60 nm.
- a TBDB film functioning as a hole transport layer is formed with a film thickness of 20 nm, and then, as a light emitting layer, the ratio of compound BH and compound BD is 40: 2.
- an Alq film having a thickness of lOnm was formed as an electron transport layer. Then do
- Li film as the donor-containing layer (light transmittance: 90%, specific resistance: 10 _5 Omega -cm) was deposited in a thickness of lnm, then as Akuseputa containing layer (CN) TCNQ film (light transmittance: 90%) The film thickness lOnm
- the film was formed. On this film, an A1 film functioning as a cathode was formed with a thickness of 150 nm to obtain an organic light emitting device.
- Example 1 except that Liq was used instead of Li as a donor and a donor-containing layer (light transmittance: 90%, specific resistance: 10 14 ⁇ 'cm) was formed in the same manner as in Example 1, An organic light emitting device was obtained.
- An organic light emitting device was obtained in the same manner as in Example 2 except that the film was formed.
- An organic light emitting device was obtained in the same manner as in Example 1 except that a putter-containing layer (light transmittance: 90%) was formed.
- Example 1 Alq and Li were used as donors, and Alq and Li were co-deposited with a film thickness lOnm so as to be 10: 0.3, and a donor-containing layer (light transmittance: 90%, specific resistance: An organic light emitting device was obtained in the same manner as in Example 1 except that 10 1 (> ⁇ ′cm) was formed.
- An organic light emitting device was obtained in the same manner as in Example 1 except that in Example 1, the film was formed without forming a Li (donor-containing layer).
- ITO On a glass substrate having a thickness of 0.7 mm, ITO was deposited to a thickness of 130 nm by sputtering. This substrate was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, followed by UV ozone cleaning for 30 minutes, and then the substrate with the ITO electrode was mounted on the substrate holder of the vacuum deposition apparatus.
- HAT is used as an acceptor
- TBDB is used as a material for the hole transport layer
- BH is used as a host material for the light emitting layer
- a blue light emitting material is used.
- BD Alq as the electron transport material, Li as the donor, and A1 as the cathode material were attached.
- a HAT functioning as an acceptor-containing layer was formed with a film thickness of lOnm.
- a TBDB film that functions as a hole transport layer is formed to a thickness of 70 nm, and then the light-emitting layer is formed of a compound BH and a compound BD in a ratio of 40: 2.
- An Alq film with a thickness of 20 nm was formed on this film as an electron transport layer.
- a Li film having a thickness of 1 nm was formed as a donor-containing layer.
- an A1 film functioning as a cathode was formed on this film with a thickness of 150 nm to obtain an organic light emitting device.
- the light emission characteristics were evaluated by applying a negative bias to ITO adjacent to HAT.
- the organic light-emitting device of the present invention can be used as a light source for displays, lighting and the like.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP07741582A EP2020694A4 (en) | 2006-04-20 | 2007-04-13 | ORGANIC LIGHTING ELEMENT |
JP2008512094A JP4392050B2 (ja) | 2006-04-20 | 2007-04-13 | 有機発光素子 |
US12/297,520 US20090128024A1 (en) | 2006-04-20 | 2007-04-13 | Organic light-emitting device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006-116466 | 2006-04-20 | ||
JP2006116466 | 2006-04-20 |
Publications (1)
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WO2007123061A1 true WO2007123061A1 (ja) | 2007-11-01 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2007/058146 WO2007123061A1 (ja) | 2006-04-20 | 2007-04-13 | 有機発光素子 |
Country Status (7)
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US (1) | US20090128024A1 (ja) |
EP (1) | EP2020694A4 (ja) |
JP (1) | JP4392050B2 (ja) |
KR (1) | KR100972895B1 (ja) |
CN (1) | CN101427399A (ja) |
TW (1) | TW200810596A (ja) |
WO (1) | WO2007123061A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
KR100972895B1 (ko) | 2010-07-28 |
JPWO2007123061A1 (ja) | 2009-09-03 |
KR20080111485A (ko) | 2008-12-23 |
CN101427399A (zh) | 2009-05-06 |
JP4392050B2 (ja) | 2009-12-24 |
TW200810596A (en) | 2008-02-16 |
EP2020694A1 (en) | 2009-02-04 |
US20090128024A1 (en) | 2009-05-21 |
EP2020694A4 (en) | 2009-05-20 |
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