WO2007063760A1 - 有機化合物、電荷輸送材料、電荷輸送材料用組成物および有機電界発光素子 - Google Patents
有機化合物、電荷輸送材料、電荷輸送材料用組成物および有機電界発光素子 Download PDFInfo
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Definitions
- Organic compound charge transport material, composition for charge transport material and organic electroluminescent device
- the present invention relates to a novel organic compound, a charge transport material comprising the organic compound, and a composition for a charge transport material containing the charge transport material.
- the present invention also relates to an organic electroluminescence device having high luminance, high efficiency and long life using a charge transport material such as this novel organic compound.
- An electroluminescent device using an organic thin film has been developed.
- An electroluminescent device using an organic thin film that is, an organic electroluminescent device, usually has an anode, a cathode, and an organic layer including at least a luminescent layer provided between these electrodes on a substrate.
- As the organic layer in addition to the light emitting layer, a hole injection layer, a hole transport layer, a hole blocking layer, an electron transport layer, an electron injection layer, and the like are used. Usually, these layers are stacked to be used as an organic electroluminescent device.
- organic electroluminescent devices have used fluorescent light emission, but in an attempt to increase the light emission efficiency of the device, it has been studied to use phosphorescent light emission instead of fluorescent light. However, even if phosphorescence is used, sufficient luminous efficiency, luminance and lifetime are not yet obtained.
- Non-Patent Document 1 proposes the following polymer compound (C-1) for the purpose of improving the solubility of polyaline, which is a conductive polymer.
- the polymer material such as the compound (C-1) has the following problems.
- Non-Patent Document 1 discloses the following compound (C2) as a model compound of the compound (C1).
- the compound (C-2) since the compound (C-2) has a secondary amine moiety, the organic thin film containing the compound (C-2) having poor heat resistance and amorphous properties cannot be crystallized or aggregated. The problem is that it easily deteriorates due to factors such as In addition, since HOMO is localized at the secondary ammine site, the compound (C-2) has a problem of poor charge transportability.
- Patent Document 1 proposes the use of the following compound (C3) as a charge transport material for an electrophotographic photoreceptor.
- the compound such as the above compound (C-3) has a heat resistance because the group bonded to the nitrogen atom of the 1,3-dihydroimidazol-2-one ring has only an aromatic ring force.
- the compound such as the above compound (C-3) has a heat resistance because the group bonded to the nitrogen atom of the 1,3-dihydroimidazol-2-one ring has only an aromatic ring force.
- Patent Document 1 Japanese Patent Laid-Open No. 10-246973
- Non-patent literature l Macromolecules 2003, 36, 4368-4373
- the present invention provides a charge transport material having excellent heat resistance and amorphousness and excellent charge transport capability, and further a composition for forming an organic electroluminescent device having high brightness, high efficiency and long life. It is an object to provide a product and an organic electroluminescent device using the same.
- an organic compound represented by the following formula (I), a charge transport material comprising the compound, and a charge transport for an organic electroluminescent device represented by the following formula ( ⁇ ⁇ -2) A material and a composition for a charge transport material containing the material are provided.
- the organic electroluminescent element having the anode, the cathode, and the light emitting layer provided between the two electrodes is provided on the substrate, and has a layer containing the charge transport material.
- An organic electroluminescent device is provided.
- Ar 1 may have a substituent, may be an aromatic hydrocarbon group, may have a substituent! /, May have! Aromatic aromatic heterocyclic group, or have a substituent, Of course, it represents an alkyl group.
- Ar 2 represents an aromatic hydrocarbon group which may have a substituent, may be an aromatic hydrocarbon group, or may have a substituent.
- Each of RR 2 independently represents a hydrogen atom or a substituent.
- R 1 and R 2 may be bonded to each other to form a ring.
- Q is represented by the following formula (I 1) or (I 2).
- Ar 3 to Ar 5 each independently represents an aromatic hydrocarbon group which may have a substituent, or a substituent, which may represent an aromatic heterocyclic group.
- Ar 3 and Ar 4 may be bonded to each other to form a ring.
- Ring A 1 represents a benzene ring which may have a substituent, or a nitrogen-containing aromatic six-membered ring which may have a substituent.
- Ar 9 each independently represents an aromatic hydrocarbon group which may have a substituent, or an aromatic heterocyclic group which may have a substituent.
- FIG. 1 is a schematic cross-sectional view showing an example of an organic electroluminescent element of the present invention.
- FIG. 2 is a schematic cross-sectional view showing another example of the organic electroluminescent element of the present invention.
- FIG. 3 is a schematic cross-sectional view showing another example of the organic electroluminescent element of the present invention.
- FIG. 4 is a schematic cross-sectional view showing another example of the organic electroluminescent element of the present invention.
- FIG. 5 is a schematic cross-sectional view showing another example of the organic electroluminescent element of the present invention.
- FIG. 6 is a schematic cross-sectional view showing another example of the organic electroluminescent element of the present invention.
- FIG. 7 is a schematic cross-sectional view showing another example of the organic electroluminescent element of the present invention.
- FIG. 8 is a schematic cross-sectional view showing another example of the organic electroluminescent element of the present invention.
- This organic compound is excellent in heat resistance, amorphousness and charge transport ability, has high singlet and triplet excitation levels, and is excellent in solubility in an organic solvent.
- the organic electroluminescence device using the charge transport material such as the organic compound and the composition for the charge transport material including the charge transport material made of the organic compound, high luminance, high efficiency and A long-life organic electroluminescent device is provided.
- a charge transport material comprising the compound, and a composition for a charge transport material containing the material, a uniform organic thin film containing a material having a high charge transport ability is formed by a wet film forming method. This makes it easy to increase the area of the organic electroluminescent device. Furthermore, according to the organic electroluminescence device using the charge transport material of the present invention and the composition for a charge transport material containing the material, it is possible to emit light with low voltage and high efficiency.
- the charge transport material of the present invention is applicable to both the vacuum deposition method and the wet film formation method because of its excellent film forming property, charge transporting property, light emitting property, and heat resistance.
- the charge transport material of the present invention and the composition for a charge transport material containing the material are excellent. Depending on the layer structure of the element, it can be used as a hole injection material, a hole transport material, a light emitting material, a host material, an electron injection material, an electron transport material, etc. Applicable.
- the organic electroluminescent device of the present invention using the charge transport material of the present invention and the composition for a charge transport material containing the material is a flat panel display (for example, for OA computer or wall-mounted television), an in-vehicle display device. It can be applied to light sources (for example, light sources for copiers, backlight sources for liquid crystal displays and instruments), display boards, and sign lamps that take advantage of the features of cell phone displays and surface light emitters. Is a big one.
- the charge transport material of the present invention and the composition for a charge transport material containing the material have essentially excellent redox stability, and thus are not limited to organic electroluminescent devices, and other electrophotosensitive materials. It can also be used effectively for bodies, photoelectric conversion elements, organic solar cells, organic rectifier elements, and the like.
- the organic compound of the present invention is represented by the following formula (I).
- Ar 1 may have a substituent, may be an aromatic hydrocarbon group, may have a substituent! /, May have! Aromatic aromatic heterocyclic group, or have a substituent, Of course, it represents an alkyl group.
- Ar 2 represents an aromatic hydrocarbon group which may have a substituent, may be an aromatic hydrocarbon group, or may have a substituent.
- Each of RR 2 independently represents a hydrogen atom or a substituent.
- R 1 and R 2 may be bonded to each other to form a ring.
- Q is represented by the following formula (I 1) or (I 2).
- Ar 3 to Ar 5 each independently represents an aromatic hydrocarbon group which may have a substituent, or an aromatic heterocyclic group which may have a substituent.
- Ar 3 and Ar 4 may be bonded to each other to form a ring.
- the organic compound of the present invention has a 5-membered ring (1,3-dihydroimidazol-2-one) structure containing a urea bond (—NR—CO—NR′—), it has an appropriate polarity and is amorphous. High quality and high heat resistance. Therefore, it is possible to form an amorphous organic thin film that is soluble in various organic solvents and does not easily crystallize. In addition, since the structure is a rigid planar structure, the organic compound of the present invention has high singlet and triplet excited levels.
- the organic compound of the present invention has a tertiary amine moiety (—Ar 2 —N (Ar 3 ) —Ar 4 ) or two directly bonded aromatic groups (Ar 2 —Ar 5 ). Therefore, charge transportability and heat resistance are further improved.
- the molecular weight of the organic compound of the present invention is usually 5000 or less, preferably 3000 or less, more preferably 2000 or less, and usually 300 or more, preferably 500 or more, more preferably 600 or more.
- the molecular weight exceeds the upper limit, purification may be difficult due to the high molecular weight of impurities, and if the molecular weight is lower than the lower limit, the glass transition temperature, melting point, vaporization temperature, etc. will decrease. The heat resistance may be significantly impaired.
- the organic compound of the present invention usually has a glass transition temperature of 40 ° C or higher, but from the viewpoint of heat resistance, it is preferably 80 ° C or higher, more preferably 110 ° C or higher.
- the organic compound of the present invention usually has a vaporization temperature of 300 ° C or higher and 800 ° C or lower.
- the organic compound of the present invention usually has an energy difference between an excited triplet state and a ground state of 2. OeV or more and 4. OeV or less, but has a viewpoint of improving the efficiency of an organic electroluminescence device using phosphorescence emission. Therefore, the energy difference between the excited triplet state and the ground state is preferably 2.3 eV or more, more preferably 2.6 eV or more, and even more preferably 2.9 eV or more.
- the method for obtaining the energy difference between the excited triplet state and the ground state is, for example, as follows.
- a solution in which a sample compound is dissolved in a spectroscopically purified solvent for example, 2-methyltetrahydrofuran
- a spectroscopically purified solvent for example, 2-methyltetrahydrofuran
- the phosphorescence emission and the fluorescence emission are separated by delaying the photoluminescence observation start time after the excitation light is incident.
- N laser light source wavelength 337nm is used according to the absorption of the material.
- R 2 each independently represents a hydrogen atom or an arbitrary substituent, and R ⁇ R 2 may be bonded to each other to form a ring.
- Examples of the optional substituent include organic groups as exemplified below, and preferably a group having a molecular weight of 500 or less. Specific examples include the following.
- alkyl group preferably a straight-chain or branched anolenoquinoyl group having 1 to 8 carbon atoms, such as methinole, ethynole, n-propyl, 2-propyl, n-butynole, isobutyl, may be substituted. And tert-butyl group).
- a alkenyl group (preferably a alkenyl group having 2 to 9 carbon atoms, such as bur, allyl, 1-butenyl group, etc.), which may have a substituent.
- alkynyl group (preferably an alkynyl group having 2 to 9 carbon atoms) may be substituted.
- ethur, propargyl group and the like can be mentioned.
- An aralkyl group (preferably an aralkyl group having 7 to 15 carbon atoms, such as a benzyl group).
- An amino group having a substituent preferably an alkylamino group having at least one alkyl group having 1 to 8 carbon atoms (for example, a methylamino-containing dimethylamine). Injecting jetylamino, dibenzylamino groups, etc.),
- a heteroaryl amino group having a 5- or 6-membered aromatic heterocycle for example, a pyridylami-containing chenilamino-containing dichenilamino group, etc.
- It may have a substituent, but may be an alkoxy group (preferably, it may have a substituent, which is an alkoxy group having 1 to 8 carbon atoms, and examples thereof include methoxy, ethoxy and butoxy groups.
- an aryloxy group (preferably having an aromatic hydrocarbon group having 6 to 12 carbon atoms, such as phenyl, 1-naphthyloxy, 2-naphthyloxy group, etc.) ),
- a substituent it may be a heteroaryloxy group (preferably having a 5- or 6-membered aromatic heterocyclic group, and examples thereof include a pyridyloxy group, a ceroxy group, and the like. ),
- an acyl group preferably, it may have a substituent, an acyl group having 2 to 10 carbon atoms, such as formyl, acetyl, benzoyl group, etc. ⁇
- It may have a substituent, but may be an alkoxy carbo group (preferably has a substituent! /, May be an alkoxy carbo group having 2 to 10 carbon atoms, for example, methoxy carbo , Ethoxycarbonyl groups, etc.), It may be substituted with a aryloxycarbol group (preferably with a substituent).
- V may be an arylcarbonyl group having 7 to 13 carbon atoms, such as a phenoxy group sulfonyl group.
- alkylcarbonyloxy group (preferably V having a substituent, or an alkylcarboxoxy group having 2 to 10 carbon atoms, such as an acetooxy group) ),
- Halogen atoms especially fluorine or chlorine atoms
- alkylthio group (preferably an alkylthio group having 1 to 8 carbon atoms, for example, a methylthio group, an ethylthio group, etc.), may have a substituent.
- An arylthio group (preferably an arylothio group having 6 to 12 carbon atoms, such as a phenolthio group, a 1-naphthylthio group, etc.) may be used.
- a sulfonyl group which may have (for example, a mesyl group, a tosyl group, etc.),
- a silyl group which may have a substituent for example, trimethylsilyl group, triphenylsilyl group, etc.
- a substituent such as a boryl group (for example, a dimesitylboryl group),
- a phosphino group for example, a diphenylphosphino group
- An aromatic hydrocarbon group which may have a substituent (e.g., benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, perylene ring, tetracene ring, pyrene ring, benzpyrene ring, taricene ring, triphenylene ring, fluoreoranthene A monovalent group derived from a 5- or 6-membered monocyclic ring or a 2-5 condensed ring, such as a ring)
- a substituent e.g., benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, perylene ring, tetracene ring, pyrene ring, benzpyrene ring, taricene ring, triphenylene ring, fluoreoranthene A monovalent group derived from a 5- or 6-membered monocyclic
- An optionally substituted heterocyclic group e.g., furan ring, benzofuran ring, thiophene ring
- substituent when the substituent further has a substituent, examples of the substituent include the above-described exemplified substituents.
- R 2 from the viewpoint of improving the viewpoint and heat resistance improving electrochemical durability, a optionally substituted aromatic hydrocarbon group is preferred instrument substituent More preferred are unsubstituted or more preferred phenyl groups, or even more preferred are mono- or di-substituted phenol groups.
- R 2 is preferably a methyl group, an ethyl group, an n-propyl group, an alkyl group which may have a substituent, from the viewpoint of further improving solubility and amorphousness.
- a methyl group, an ethyl group, and an n-propyl group are more preferable, and an alkyl group having 1 to 4 carbon atoms such as a propyl group, an n-butyl group, an isobutyl group, and a tert-butyl group is more preferable.
- R 2 is preferably a hydrogen atom from the viewpoint of preventing a decrease in triplet excited level.
- RR 2 is that you have to form a ring is preferably bonded to each other.
- Examples of the organic compound represented by the formula (I) when RR 2 is bonded to each other to form a ring are shown below, but the present invention is not limited thereto.
- examples of R include the substituents exemplified as R 1 and R 2 or a hydrogen atom.
- R 2 is able to form a benzene ring or a nitrogen-containing aromatic six-membered ring bonded to each other I like it. That is, the organic compound of the present invention is preferably represented by the following formula (II).
- Ar 2 and Q have the same meanings as in formula (I).
- Ring A 1 represents a benzene ring which may have a substituent, or a nitrogen-containing aromatic six-membered ring which may have a substituent.
- Examples of the nitrogen-containing aromatic six-membered ring of ring A 1, a pyridine ring, a pyrazine ring, a pyrimidine ring, pyrid Jin ring, Toriajin ring.
- a pyridine ring is preferable.
- Examples of the substituent for ring A 1 include those exemplified as RR 2 , which is preferable! /
- Ar 1 in the organic compound of the present invention is an aromatic hydrocarbon group which may have an arbitrary substituent, an aromatic heterocyclic group which may have an arbitrary substituent, or an arbitrary substituent.
- Ar 2 represents an aromatic hydrocarbon group that may have an arbitrary substituent, or an aromatic group that may have an arbitrary substituent, and may be an aromatic group. Represents a heterocyclic group.
- Ar 2 may have, examples of the substituent include the substituents exemplified as R 2 .
- the substituents for Ar 1 and Ar 2 may be formed by linking a plurality of substituents exemplified as R 1 and R 2 . In addition, these substituents may be bonded to adjacent groups to form a ring.
- Ar 1, including its substituents preferably has a molecular weight of 3000 or less, more preferably 1000 or less.
- Ar 2 —Q, including its substituents preferably has a molecular weight of 3000 or less, preferably 1000 or less.
- Ar 2 may have a substituent, and from the viewpoint of improving heat resistance, the substituent may have an aromatic hydrocarbon group, more preferably a substituent.
- a group having a group may be an unsubstituted group, more preferably an unsubstituted group, or a mono- or di-substituted group.
- an alkyl group which may have a substituent is more preferable from the viewpoint of further improving solubility and amorphousness.
- Ar 2 may have a low singlet and triplet excited level as a substituent.
- a group derived from a 1,3-dihydroimidazol 2-one ring is preferred because it further improves heat resistance and charge transport capability while preventing lowering.
- Illustrative examples of the aromatic hydrocarbon group applicable to Ar 2 include benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, perylene ring, tetracene ring, pyrene ring, benzpyrene ring, tarisene ring, triphenyl ring.
- aromatic heterocyclic groups applicable to Ar 2 include furan ring, benzofuran ring, thiophene ring, benzothiophene ring, pyrrole ring, pyrazole ring, imidazole ring, oxadiazole ring, indole ring, force rubazole ring , Pyrroloimidazole ring, pyrrolopyrazole ring, pyrrolopyrrole ring, chenovirol ring, chenotiophen ring, furopyrrole ring, furofuran ring, thienofuran ring, benzoisoxazole ring, benzoisothiazole ring, benzimidazole ring, pyridine ring, pyrazine ring, 5 or 6 such as pyridazine ring, pyrimidine ring, triazine ring, quinoline ring, isoquinoline ring, sinoline ring, quinoxa
- alkyl groups applicable to Ar 1 include alkyls having 1 to 4 carbon atoms such as methyl, ethyl, n-propyl, 2 propyl, n-butyl, isobutyl, sec butyl group, tert butyl group, etc. Groups.
- Ar 1 may have a substituent from the viewpoint of preventing a decrease in the triplet excitation level. It may be! / ⁇ A group derived from a benzene ring, or a pyridine ring optionally having a substituent A group having a benzene ring or a substituent, or a group in which a plurality of pyridine rings (for example, 2 to: LO) are linked (for example, biphenyl group, terphe- And the like, and the like.
- Ar 1 is preferably the same as Ar 2-Q because it is easy to synthesize and tends to have a high triplet excitation level.
- Ar 1 is preferably a group different from Ar 2 —Q from the viewpoint of improving solubility.
- Ar 2 may have a substituent from the viewpoint of preventing a decrease in the triplet excited level. It may be! / ⁇ ⁇ A group derived from a benzene ring, or a pyridine ring optionally having a substituent Even if it has a substituent or
- a divalent group for example, biphenyl, terphel, bibilidyl, terpyridyl, phenol
- -Dipyridine derived from dipyridine, diphenylpyridine, dipyridylbenzene, etc.).
- Ar 2 is further improved in electrochemical durability from the point of view of p-phenylene group, 4, 4, 1 biphenylene group, 4, 3, 1 biphenylene group, 3, 4, 1 More preferably, it is a biphenylene group.
- Ar 2 is more preferably an m-phenylene group or a 3,3′-biphenylene group from the viewpoint of further improving the solubility.
- the preferred tool Pirijinjiiru group include pyridine ring, or Bibirijiru, terpyridyl, phenylalanine pyridine, di phenylalanine pyridine, from dipyridyl benzene More preferably, it is a divalent group.
- both Ar 1 and Ar 2 are groups derived from a benzene ring from the viewpoints of solubility and heat resistance, and prevention of lowering of the triplet excited level.
- the organic compound of the present invention is preferably represented by the following formula (III).
- R ⁇ R 2 and Q have the same meanings as in formula (I).
- Ring B 1 may have a substituent and may represent a benzene ring, and ring C 1 may have a substituent other than Q! /! May represent a benzene ring.
- ring have the ring C 1 is also O, examples and preferred that the substituent, examples, respectively, in front Symbol Ar 1, Ar 2 has, even I, similar to the substituent It is.
- both Ar 1 and Ar 2 are groups derived from a pyridine ring. This is preferable from the viewpoint of preventing the lowering of the triplet excited level.
- the organic compound of the present invention is preferably represented by the following formula ( ⁇ -2).
- R ⁇ R 2 and Q have the same meanings as in formula (I).
- Ring D 1 may have a substituent and may represent a pyridine ring, and ring E 1 may have a substituent other than Q! Or may represent a pyridine ring.
- Q in the organic compound of the present invention represents a group whose formula (1-1) or (1-2) force is also selected.
- Ar 3 to Ar 5 each independently represents an aromatic hydrocarbon group which may have a substituent, or an aromatic heterocyclic group which may have a substituent.
- Ar 3 and Ar 4 may be bonded to each other to form a ring.
- Ar 3 to Ar 5 may have, and examples of the substituent include those exemplified as RR 2 .
- Ar 3 to Ar 5 have! /, May ! / Are preferred as substituents! /, For example, ⁇ Ar 2 has! / ⁇ The preference for substituents is the same as in the examples.
- Examples of aromatic hydrocarbon groups and aromatic heterocyclic groups applicable to Ar 3 to Ar 5 are: This is the same as the examples of the aromatic hydrocarbon group and aromatic heterocyclic group applicable to Ar 2 .
- Ar 3 and Ar 4 are more preferably substituted with an aromatic hydrocarbon group which may have a substituent.
- a phenyl group which may have a group, more preferably an unsubstituted phenyl group, 1 or
- Q is preferably represented by the formula (1-1).
- Ar 3 and Ar 4 may be bonded to each other to form a ring that may have a substituent.
- Preferred examples of Ar 3 Ar 4 N— when Ar 3 and Ar 4 are bonded to each other to form a ring are shown below. Of these, N-carbazolyl group is more preferable because it has a high triplet excited level.
- Q is preferably represented by the formula (1-2).
- Ar 5 has a substituent from the viewpoint of preventing a decrease in triplet excited level.
- V or a group derived from a benzene ring or a group in which a plurality of benzene rings (for example, 2 to: LO) are connected (for example, biphenylene group, terfenylene group, etc.) is preferable.
- the organic compound of the present invention is preferably represented by the following formula (IV) because it has all of high charge transporting ability, high electrochemical stability, and high triplet excited level.
- Ar 2 to Ar 4 , R 1 and R 2 have the same meanings as in the formula (I) and the formula (I-1).
- Ar 6 to Ar 8 each independently represents an aromatic hydrocarbon group which may have a substituent, or an aromatic heterocyclic group which may have a substituent.
- Ar 7 and Ar 8 may be bonded to each other to form a ring.
- Examples of Ar 6 and preferred examples are the same as those of Ar 2 , respectively.
- Examples and preferred examples of Ar 7 and Ar 8 are the same as each, Ar 3 or Ar 4.
- the site of Ar 1 to the onset Ming organic compounds, Ar 2 - sites of Q, the site of R 1 or R 2 it is preferable to have 1 or more, preferably 1 to 6, more preferably 2 to 4 N-force rubazolyl groups represented by the following formula (I-3).
- the carbazolyl group may have a substituent, but is preferably unsubstituted.
- the organic compound of the present invention can be synthesized by selecting a raw material according to the structure of the target compound and using a known method.
- a 2-hydroxyimidazole derivative represented by the formula (i) and a halide (Ar 1 —X 1 ) are mixed with copper powder, copper halide (1), copper oxide (1), and palladium complex.
- Transition metal catalysts about 0.001 to 5 equivalents to the halogen atom of the norogenide (A —X 1 )
- potassium carbonate calcium carbonate, potassium phosphate, cesium carbonate, tert-butoxy sodium
- a basic substance such as triethylamine (about 1 to 10 equivalents to the halogen atom of neurogen (Ar 1 —X 1 )) in an inert gas stream, no solvent or aromatic solvent, ether
- a compound represented by the following formula (ii) can be obtained by stirring and mixing in a solvent such as a silver solvent at 20 to 300 ° C.
- a compound represented by the following formula (ii) and a halide (X 2 —Ar 2 —Q) are converted into a transition metal such as copper powder, copper halide (I), copper oxide (I), or palladium complex.
- the halide (X 2 —Ar 2 —Ar 5 ) can be synthesized using a known coupling reaction.
- a known coupling method specifically, “Pallad mm in Heterocyclic Chemistry: A guide for tne Synthetic and hemistj (younger brother 2nd edition, 2 002, Jie Jack Li and Gordon W.
- Gribble, Pergamon Organic synthesis pioneered by metals "Various reaction types and latest results” (1997, Tatsuro Nichiro, Kagaku Dojinsha), “Bolhard's Shore One Contemporary Organic Chemistry” (2004, KPCVollhardt, Kagaku Dojinsha)
- a coupling reaction between rings such as a coupling reaction between a halogenated aryl and an aryl borate described or cited in the above can be used.
- Usable reagents and the like are the same as in the step of synthesizing the compound represented by the formula (ii) from the compound represented by the above formula (i).
- Ar 4 Ar 4 Purification methods of synthesized compounds include “Separation and purification technology handbook” (Year, Japan Chemical Society), “High-level separation of trace components and difficult-to-purify substances by chemical conversion method” (Year, Published by IPC Co., Ltd.), or the method described in the section “Separation and Purification” of “Experimental Chemistry Course (Ver.)” (Year, Japan Society of Social Sciences) Is available.
- extraction including suspension washing, boiling washing, ultrasonic washing, acid-base washing), adsorption
- Product chromatography and purity analysis methods include gas chromatograph (, high-performance liquid chromatograph, high-speed amino acid analyzer, capillary electrophoresis measurement, size exclusion chromatograph (, gel permeation chromatograph (, cross-fractionation chromatograph (mass spectrometry) (,, Nuclear magnetic resonance equipment
- the organic compound of the present invention has a high charge transport property, an electron is used as a charge transport material. It can be suitably used for photographic photoreceptors, organic electroluminescent elements, photoelectric conversion elements, organic solar cells, organic rectifying elements and the like.
- the organic compound and the charge transport material of the present invention are particularly suitable as an organic electroluminescent element material.
- the charge transport material of the present invention is composed of the organic compound of the present invention, or the following formula (
- Ring A 1 represents a benzene ring which may have a substituent, or a nitrogen-containing aromatic six-membered ring which may have a substituent.
- Ar 9 each independently represents an aromatic hydrocarbon group which may have a substituent, or an aromatic heterocyclic group which may have a substituent.
- ring A Ar 1 has the same meaning as A Ar 1 in formula (II), and the substituents and preferred examples thereof are also the same.
- Ar 9 can be the same as Ar 1 , Ar
- Ar 1 may have the same as the substituent.
- the molecular weight of the charge transport material of the present invention represented by the above formula (II-2) is usually 5000 or less, preferably 3000 or less, more preferably 2000 or less, and usually 300 or more, preferably 500. Above, more preferably 600 or more. If the molecular weight exceeds the upper limit, purification may be difficult due to the high molecular weight of the impurities, and if the molecular weight is lower than the lower limit, the glass transition temperature, melting point, vaporization temperature, etc. will decrease. The heat resistance may be significantly impaired.
- the charge transport material of the present invention usually has a glass transition temperature of 40 ° C or higher, but from the viewpoint of heat resistance, it is preferably 80 ° C or higher, more preferably 110 ° C or higher.
- the charge transport material of the present invention usually has a vaporization temperature of 300 ° C or higher and 800 ° C or lower.
- the charge transport material of the present invention usually has an energy difference between an excited triplet state and a ground state of 2. OeV or more and 4. OeV or less, but from the viewpoint of improving the efficiency of an organic electroluminescence device using phosphorescence.
- the energy difference between the excited triplet state and the ground state is preferably 2.3 eV or more, more preferably 6 eV or more, and even more preferably 2.9 eV or more.
- the hydrocarbon contained in the composition for charge transport material is preferably an aromatic hydrocarbon.
- Toluene is listed as a representative example of aromatic hydrocarbons, and in the present invention, toluene is used as an index indicating the solubility of organic compounds (charge transport materials).
- the layer constituting the organic electroluminescence device can be easily formed by a wet film forming method.
- the upper limit of solubility is not particularly limited, but is usually about 50% by weight.
- composition for a charge transport material of the present invention contains the above-described charge transport material of the present invention, usually contains the charge transport material of the present invention and a solvent, and more preferably contains a phosphorescent material. Preferably, it is used for organic electroluminescent elements.
- the solvent contained in the composition for a charge transport material of the present invention is not particularly limited as long as it is a solvent in which the charge transport material of the present invention which is a solute dissolves well.
- aromatic hydrocarbons such as toluene, xylene, methicylene, cyclohexylbenzene, and tetralin
- halogenated aromatic hydrocarbons such as chlorobenzene, dichlorobenzene, and trichlorobenzene
- 1,2-dimethoxybenzene, 1,3-dimethoxybenzene, carsol hue
- Aromatic ethers such as netol, 2-methoxytoluene, 3-methoxytoluene, 4-methoxytoluene, 2,3dimethylasol, 2,4 dimethylasol
- Aromatic esters such as methyl, ethyl benzoate, propyl benzoate, and n-butyl benzoate
- Ketones having an alicyclic ring such as cyclo
- organic electroluminescent devices use many materials such as cathodes that deteriorate significantly due to moisture, the presence of moisture in the composition causes moisture to remain in the dried film, resulting in device characteristics. The possibility of lowering is considered preferable.
- Examples of the method for reducing the amount of water in the composition include nitrogen gas sealing, use of a desiccant, dehydration of the solvent in advance, use of a solvent with low water solubility, and the like.
- a solvent having low water solubility because the solution film can prevent whitening by absorbing moisture in the atmosphere during the wet film-forming process.
- the charge transport material composition to which the present embodiment is applied has, for example, a water solubility at 25 ° C. of 1% by weight or less, preferably 0.1% by weight or less. It is preferable to contain 10% by weight or more of a solvent in the composition.
- the boiling point is 100 ° C or higher as the solvent of the composition for charge transport materials. It is effective to use a solvent having a boiling point of 150 ° C or higher, more preferably 200 ° C or higher. In order to obtain a more uniform film, it is necessary for the solvent to evaporate from the liquid film immediately after film formation at an appropriate rate.
- the boiling point is usually 80 ° C or higher, preferably the boiling point is 100 ° C or higher.
- the boiling point is 120 ° C or higher, usually the boiling point is less than 270 ° C, preferably the boiling point is 250 It is effective to use a solvent having a boiling point of less than ° C, more preferably less than 230 ° C.
- a solvent that satisfies the above-mentioned conditions that is, the conditions of solute solubility, evaporation rate, and water solubility may be used alone, or two or more kinds of solvents may be mixed and used.
- the charge transport material composition of the present invention particularly the charge transport material composition used as the charge transport material composition, preferably contains a light emitting material.
- the light emitting material refers to a component that mainly emits light in the composition for a charge transport material of the present invention, and corresponds to a dopant component in an organic electroluminescent device. That is, the amount of light emitted from the charge transport material composition (unit: cdZm 2 ) is usually 10 to: LOO%, preferably
- the light-emitting material a known material can be applied, and a fluorescent light-emitting material or a phosphorescent light-emitting material can be used alone or in combination. From the viewpoint of internal quantum efficiency, a phosphorescent light-emitting material is preferable. is there.
- the maximum emission peak wavelength of the luminescent material is preferably in the range of 390 to 490 nm.
- Examples of fluorescent dyes that emit blue light include perylene, pyrene, anthracene, coumarin, P-bis (2-phenylethyl) benzene, and derivatives thereof.
- Examples of the green fluorescent dye include quinacridone derivatives and coumarin derivatives.
- Examples of yellow fluorescent dyes include rubrene and perimidone derivatives.
- Examples of red fluorescent dyes include DCM compounds, benzopyran derivatives, rhodamine derivatives, benzothixanthene derivatives, azabenzothixanthene, and the like.
- Examples of the phosphorescent material include organometallic complexes containing a metal selected from Group 7 to Group 11 forces in the periodic table.
- Periodic table 7 and metal in a phosphorescent organometallic complex containing a metal selected from group 11 Preferred examples thereof include ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum, and gold.
- Preferred examples of these organometallic complexes include compounds represented by the following general formula (V) or formula (VI).
- M represents a metal
- q represents the valence of the metal
- L and L ′ represent bidentate ligands.
- j represents 0, 1 or 2;
- M d represents a metal
- T represents represents a carbon or nitrogen.
- R 92 to R 95 each independently represents a substituent. However, when T is nitrogen, there is no R 94 or R 95 .
- the compound represented by formula (V) will be described first.
- M represents an arbitrary metal, and specific examples of preferable ones include the metals described above as the metals for which the periodic table 7 and 11 group forces are also selected.
- the bidentate ligands L and L ′ in the general formula (V) have the following partial structures, respectively.
- the ligand to be shown is shown.
- the ring A1 represents an aromatic hydrocarbon group or an aromatic heterocyclic group, and these may have a substituent.
- Ring A2 represents a nitrogen-containing aromatic heterocyclic group, and these may have a substituent.
- substituents include: a halogen atom such as a fluorine atom; an alkyl group such as a methyl group or an ethyl group; an alkenyl group such as a vinyl group; a methoxy carb group Alkoxy group such as ethoxycarbol group; alkoxy group such as methoxy group and ethoxy group; aryloxy group such as phenoxy group and benzyloxy group; dialkylamino group such as dimethylamino group and jetylamino group; diphenylamino group A diarylamino group such as carbazolyl group; an acyl group such as acetyl group; a haloalkyl group such as trifluoromethyl group; a cyano group; an aromatic hydrocarbon group such as a phenol group, a naphthyl group, and a phenanthyl group.
- a halogen atom such as a fluorine atom
- an alkyl group such
- the compound represented by the general formula (V) is more preferably the following general formula (Va), (Vb), (
- M a represents the same metal as M, and w represents the valence of the metal.
- Ring A1 may have a substituent and may represent an aromatic hydrocarbon group, and Ring A2 may have a substituent and may have a substituent! / ⁇ represents a nitrogen-containing aromatic heterocyclic group. .
- M b represents the same metal as M, and w represents the valence of the metal.
- Ring A1 may have a substituent, may have an aromatic hydrocarbon group or a substituent, and may represent a V ⁇ aromatic heterocyclic group, and ring A2 may have a substituent. Or a nitrogen-containing aromatic heterocyclic group.
- M e represents the same metal as M, w represents the valence of the metal.
- J represents 0, 1 or 2;
- ring A1, ring A1 and ring A1 ′ may each independently have a substituent! / ⁇ ! / ⁇ may have an aromatic hydrocarbon group or substituent! / ⁇ ! ⁇
- Ring A2 and Ring A2 ′ each independently represent a nitrogen-containing aromatic heterocyclic group which may have a substituent.
- the group of ring A1 and ring Al ′ is preferably, for example, a phenyl group, a biphenyl group, a naphthyl group or an anthryl group.
- Chael group, fu Examples include a ryl group, a benzochel group, a benzofuryl group, a pyridyl group, a quinolyl group, an isoquinolyl group, and a carbazolyl group.
- the group of ring A2 and ring A2 ' is preferably a pyridyl group, pyrimidyl group, pyrazyl group, triazyl group, benzothiazole group, benzoxazole group, benzoimidazole group, quinolyl group, for example. Group, isoquinolyl group, quinoxalyl group, phenanthridyl group and the like.
- the compounds represented by the general formulas (Va), (Vb), (Vc) may have a halogen atom such as a fluorine atom as a substituent; a methyl group, an ethyl group Alkyl groups such as vinyl groups; Alkyl groups such as vinyl groups; Alkoxycarbonyl groups such as methoxycarbon groups and ethoxycarbonyl groups; Alkoxy groups such as methoxy groups and ethoxy groups; Aryloxy groups such as phenoxy groups and benzyloxy groups A dialkylamino group such as a dimethylamino group or a jetylamino group; a diarylamino group such as a diphenylamino group; a carbazolyl group; an acyl group such as an acetyl group; a haloalkyl group such as a trifluoromethyl group; a cyano group;
- a halogen atom such as a fluorine atom as a substituent
- the carbon number is usually 1 or more and 6 or less. Furthermore, when the substituent is an alkenyl group, the carbon number is usually 2 or more and 6 or less. Further, when the substituent is an alkoxycarbo group, the carbon number is usually 2 or more and 6 or less. Furthermore, when the substituent is an alkoxy group, the carbon number is usually 1 or more and 6 or less. When the substituent is an aryloxy group, the carbon number is usually 6 or more and 14 or less. Further, when the substituent is a dialkylamino group, the carbon number is usually 2 or more and 24 or less.
- the number of carbon atoms is usually 12 or more and 28 or less.
- the number of carbon atoms is usually 1 or more and 14 or less.
- the substituent is a haloalkyl group, the carbon number is usually 1 or more and 12 or less.
- substituents may be linked to each other to form a ring.
- substituent of ring A1 and the substituent of ring A2 are bonded, or the substituent of ring A1 ′ and the substituent of ring A2 ′ are bonded,
- One condensed ring may be formed. Examples of such a condensed ring group include a 7,8-benzoquinoline group.
- ring Al ring A1 ', ring A2 and ring A2'
- alkyl preferably alkyl.
- organometallic complex represented by the above general formula (V), (Va), (Vb) or (Vc) are shown below, but are not limited to the following compounds (in the following) , Ph represents a full group.
- the ligands L and Z or L are 2-aryl pyridine ligands, that is, 2-aryl pyridines, those having an arbitrary substituent bonded thereto, and those having an arbitrary group condensed thereto. Preference is given to compounds having.
- M d represents a metal, and specific examples thereof include the metals described above as metals for which the periodic table group 7 to 11 forces are also selected. Among these, ruthenium, rhodium, noradium, silver, rhenium, osmium, iridium, platinum or gold are preferable, and divalent metals such as platinum and palladium are particularly preferable.
- R 92 and R 93 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an alkenyl group, a cyano group, an amino group, an acyl group, an alkoxycarboxyl.
- R 94 and R 95 each independently represents a substituent represented by the same exemplary compounds and R 92 and R 93.
- R 94 and R 95 are absent.
- R 92 to R 95 may further have a substituent, also.
- the substituent that may be further added can be any group that is not particularly limited.
- R 92 to R 95 may be bonded to each other to form a ring, and this ring may further have an arbitrary substituent.
- T-1, T-10 to T-15 of the organometallic complex represented by the general formula (VI) are shown below, but are not limited to the following exemplified compounds.
- Me represents a methyl group
- Et represents an ethyl group.
- composition for a charge transport material of the present invention particularly the composition for a charge transport material used as the composition for a charge transport material, in addition to the solvent and the light emitting material described above, various other types can be used as necessary.
- a solvent may be included. Examples of such other solvents include amides such as ⁇ , ⁇ -dimethylformamide, ⁇ , ⁇ -dimethylacetamide, and dimethyl sulfoxide.
- a photocurable resin or a thermosetting resin may be contained for the purpose of curing and insolubilizing after film formation.
- the solids concentration of the charge transport material composition, particularly the charge transport material, the luminescent material, and components that can be added as required (e.g. leveling agent) in the charge transport material composition is usually 0. 01% by weight or more, preferably 0.05% by weight or more, more preferably 0.1% by weight or more, more preferably 0.5% by weight or more, most preferably 1% by weight or more, usually 80% by weight or less, It is preferably 50% by weight or less, more preferably 40% by weight or less, further preferably 30% by weight or less, and most preferably 20% by weight or less. If this concentration is lower than the lower limit, it is difficult to form a thick film when forming a thin film, and if it exceeds the upper limit, it may be difficult to form a thin film.
- the light-emitting material Z charge transport material has a weight mixing ratio of usually 0.1 / 99.9 or more. More preferably 0.5 / 99.5 or more, more preferably 1Z99 or more, most preferably 2 Z98 or more, usually 50Z50 or less, more preferably 40Z60 or less, More preferably, it is 30Z70 or less, and most preferably 20Z80 or less. If this ratio falls below the lower limit or exceeds the upper limit, the luminous efficiency may be significantly reduced.
- the composition for a charge transport material of the present invention is a solute comprising a charge transport material, a light emitting material, and various additives such as a leveling agent and an antifoaming agent that can be added as necessary. Is dissolved in a suitable solvent. In order to shorten the time required for the dissolution process and to keep the solute concentration in the composition uniform, the solute is usually dissolved while stirring the solution. The dissolution step may be performed at room temperature, but if the dissolution rate is slow, it can be dissolved by heating. After completion of the dissolution process, a filtration process such as filtering may be performed as necessary.
- the organic electroluminescent device is used for the charge transport material composition of the present invention (charge transport material composition).
- charge transport material composition When a layer is formed by a wet film-forming method using), if moisture is present in the composition for charge transport material used, moisture is mixed into the formed film and the uniformity of the film is impaired. It is preferable that the water content in the composition for a charge transport material of the present invention, particularly the composition for a charge transport material, is as low as possible.
- organic electroluminescent devices use many materials such as cathodes that deteriorate significantly due to moisture, when moisture is present in the composition for charge transport material, moisture remains in the dried film. It is preferable because there is a possibility of deteriorating the characteristics of the element.
- the amount of water contained in the charge transport material composition of the present invention is usually 1 wt% or less, preferably 0.1 wt% or less, more preferably. Is less than 0.01 wt%.
- the composition for a charge transport material of the present invention in order to improve the stability in a wet film forming process, for example, the ejection stability of the nozzle force in an ink jet film forming method, It is preferably a uniform liquid at room temperature.
- a uniform liquid at room temperature means that the composition is a liquid having a uniform affinity and does not contain a particle component having a particle size of 0.1 m or more in the composition.
- the viscosity of the charge transport material composition of the present invention especially the charge transport material composition, if the viscosity is extremely low, for example, the coating surface is uneven due to excessive liquid film flow in the film forming process. Ink jet film formation tends to cause nozzle discharge defects, and when the viscosity is extremely high, nozzle clogging or the like occurs easily in ink jet film formation. Therefore, the viscosity of the composition of the present invention at 25 ° C is usually 2 mPa's or more, preferably 3 mPa's or more, more preferably 5 mPa's or more, and usually lOOOOmPa's or less, preferably 100 mPa's. It is' s or less, more preferably 50 mPa's or less.
- the surface tension of the composition for a charge transport material of the present invention is usually less than 50 mNZm, preferably less than 40 mNZm.
- the vapor pressure of the composition for a charge transport material of the present invention is high, problems such as a change in solute concentration due to evaporation of the solvent may easily occur.
- the vapor pressure at 25 ° C. of the composition of the present invention is usually 50 mmHg or less, preferably 10 mmHg or less, more preferably ImmHg or less.
- the composition for a charge transport material of the present invention is preferably stored in a container capable of preventing the transmission of ultraviolet rays, for example, a brown glass bottle, and sealed.
- the storage temperature is usually ⁇ 30 ° C or higher, preferably 0 ° C or higher, and usually 35 ° C or lower, preferably 25 ° C or lower.
- the organic electroluminescent device of the present invention has an anode, a cathode, and a light emitting layer provided between both electrodes on a substrate, and has a layer containing the charge transport material of the present invention. .
- the layer containing the charge transport material is preferably formed using the charge transport material composition of the present invention.
- the layer containing the charge transport material is preferably the light emitting layer.
- an organometallic complex is doped in the layer containing the charge transport material. As this organometallic complex, those exemplified as the light emitting material can be used.
- FIG. 1 is a substrate
- 2 is an anode
- 3 is a hole injection layer
- 4 is A light emitting layer
- 5 represents an electron injection layer
- 6 represents a cathode.
- the substrate 1 serves as a support for the organic electroluminescent element, and quartz or glass plates, metal plates or metal foils, plastic films or sheets, etc. are used.
- a glass plate and a transparent synthetic resin plate such as polyester, polymetatalylate, polycarbonate, and polysulfone are preferable.
- gas barrier properties it is necessary to pay attention to gas barrier properties. . If the gas barrier property of the substrate is too small, the organic electroluminescent element may be deteriorated by the outside air that has passed through the substrate, which is not preferable. For this reason, a method of securing a gas noria property by providing a dense silicon oxide film or the like on at least one surface of the synthetic resin substrate is also a preferable method.
- An anode 2 is provided on the substrate 1.
- the anode 2 plays a role of hole injection into the layer on the light emitting layer side (such as the hole injection layer 3 or the light emission layer 4).
- This anode 2 is usually made of metal such as aluminum, gold, silver, nickel, iron ⁇ radium, platinum, metal oxide such as indium and z or tin, copper iodide, etc. It is composed of a metal halide, carbon black, or a conductive polymer such as poly (3-methylthiophene), polypyrrole or polyaline.
- the anode 2 is usually formed by a sputtering method, a vacuum evaporation method, or the like.
- a suitable noder is used.
- the anode 2 can also be formed by dispersing it in a resin solution and applying it on the substrate 1.
- a thin film can be formed directly on the substrate 1 by electrolytic polymerization, or the anode 2 can be formed by applying a conductive polymer on the substrate 1 (Appl. Phys. Lett., 60 ⁇ , 2711, 1992).
- the anode 2 usually has a single-layer structure, but if desired, it should have a laminated structure with multiple material forces.
- the thickness of the anode 2 varies depending on the required transparency.
- the visible light transmittance is usually 60% or more, preferably 80% or more.
- the thickness of the anode is usually 5 nm or more, preferably lOnm or more, and usually lOOOnm or less, preferably about 500 nm or less. If it can be opaque, the thickness of the anode 2 is arbitrary, and the anode 2 may be the same as the substrate 1. Furthermore, it is also possible to laminate different conductive materials on the anode 2 described above.
- Impurities attached to the anode are removed, and the ion injection potential is adjusted to improve the hole injection property. It is preferable to treat the surface of the anode with ultraviolet (uv) Z ozone, oxygen plasma, or argon plasma for the purpose of improving the surface.
- ultraviolet (uv) Z ozone, oxygen plasma, or argon plasma for the purpose of improving the surface.
- the hole injection layer 3 is a layer that transports holes from the anode 2 to the light emitting layer 4, the hole injection layer 3 preferably contains a hole transporting compound.
- a cationic radical in which one electron is removed from an electrically neutral compound accepts one electron from a nearby electrically neutral compound, whereby a hole is generated.
- the hole transporting compound gives electrons to the anode 2 when energized, so that the cation of the hole transporting compound A radical is generated, and holes are transported by transferring electrons between the cation radical and an electrically neutral hole transporting compound.
- the hole injection layer 3 contains a cation radical compound
- cation radicals necessary for hole transport exist at a concentration higher than that generated by the acid generated by the anode 2, and the positive injection is present.
- the hole injection layer 3 preferably contains a cation radical compound.
- an electrically neutral hole transporting compound is present in the vicinity of the cation radical compound, electrons are transferred smoothly, and therefore the cationic radical compound and the hole transporting compound are combined in the hole injection layer 3. More preferably.
- the cation radical compound is a cation radical that is a chemical species in which one electron is removed from a hole transport property, and an ion compound that has an anti-ion force.
- V-holes free carriers
- the hole injection layer 3 contains a hole transporting compound and an electron accepting compound.
- the hole-injecting layer 3 contains a hole-transporting compound and an electron-accepting compound. It is even more preferable to include. Further, it is more preferable that the hole injection layer 3 contains a cation radical compound and a hole transport compound which preferably contain a cation radical compound. [0180] Further, as required, the hole injection layer 3 may contain a binder resin that hardly traps charges or a coating property improving agent.
- the hole injection layer 3 only an electron-accepting compound or an electron-accepting compound and a hole-transporting compound is used to form a film on the anode 2 by a wet film-forming method.
- the composition for a charge transport material of the present invention can also be laminated directly by coating or vapor deposition. In this case, a part or all of the charge transport material composition of the present invention interacts with the electron-accepting compound, whereby hole transport excellent in hole injecting property as shown in FIGS. Layer 10 is formed.
- the hole transporting compound a compound having an ionization potential of 4.5 eV to 6. OeV is preferable.
- Examples of the hole transporting compound include, in addition to the charge transporting material of the present invention, aromatic amine compounds, phthalocyanine derivatives, porphyrin derivatives, oligothiophene derivatives, polythiophene derivatives, and the like. Of these, aromatic amine compounds are preferable from the viewpoint of amorphousness and visible light transmittance.
- aromatic tertiary amine compounds such as the charge transport material of the present invention are particularly preferable.
- the aromatic tertiary amine compound is a compound having an aromatic tertiary amine structure and also includes a compound having a group derived from an aromatic tertiary amine.
- the type of the aromatic tertiary amine compound is not particularly limited, but from the viewpoint of the surface smoothing effect, a polymer compound having a weight average molecular weight of 1000 or more and 1000000 or less (polymerization-type organic compound in which repeating units are connected). Compound) is more preferred.
- Preferred examples of the aromatic tertiary amine polymer compound include a polymer compound having a repeating unit represented by the following general formula (VII).
- Ar 21 and Ar 22 each independently represent an aromatic hydrocarbon group which may have a substituent or an aromatic heterocyclic group which may have a substituent.
- Ar 23 to Ar 25 are each independently O 2 CH 2 and may have a divalent aromatic hydrocarbon group which may have a substituent, or a divalent aromatic heterocyclic ring which may have a substituent.
- Y represents a linking group selected from the following linking group group.
- two groups bonded to the same N atom among Ar 21 to Ar 25 may be bonded to each other to form a ring.
- Ar 31 to Ar 41 are each independently 1 derived from an aromatic hydrocarbon ring which may have a substituent or an aromatic heterocyclic ring which may have a substituent. Represents a divalent or divalent group.
- R 1Cn and R 1C> 2 each independently represent a hydrogen atom or an optional substituent
- Examples of the aromatic hydrocarbon ring include a 5- or 6-membered monocyclic ring or a 2-5 condensed ring. Specific examples include a benzene ring, a naphthalene ring, an anthracene ring, a phenanthrene ring, a perylene ring, a tetracene ring, a pyrene ring, a benzpyrene ring, a taricene ring, a triphenylene ring, a acenaphthene ring, a fluoranthene ring, and a fluorene ring.
- Examples of the aromatic heterocyclic ring include a 5- or 6-membered monocyclic ring or a 2-4 condensed ring. Specific examples include furan ring, benzofuran ring, thiophene ring, benzothiophene ring, pyrrole ring, pyrazole ring, imidazole ring, oxadiazole ring, indole ring, strong rubazole ring, pyrroloimidazole ring, pyrrolopyrazole ring, pyrrolopyrrole ring, chenoviolol.
- Ar 23 to Ar 25 , Ar 31 to Ar 35 , Ar 37 to Ar 4 are derived from one or more of the aromatic hydrocarbon rings and Z or aromatic heterocycles exemplified above. Two or more divalent groups can be linked and used.
- aromatic hydrocarbon ring and Z or aromatic heterocyclic group derived from Ar 21 to Ar 41 may further have a substituent.
- the molecular weight of the substituent is usually 400 or less, preferably about 250 or less.
- the type of the substituent is not particularly limited, and examples thereof include one or more selected from the following substituent group D force.
- Groups such as phenylmethylamino groups, usually having 6 or more carbon atoms, preferably 7 or more, usually 25 or less, preferably 17 or less aryl alkylamino groups; acetyl groups, benzoyl groups, etc.
- a halogen atom such as a fluorine atom or a chlorine atom; a trifluoromethyl group or the like
- the carbon number is usually 1 or more, usually 8 or less, preferably 4 or less
- Ar 21 and Ar 22 are monovalent derived from a benzene ring, a naphthalene ring, a phenanthrene ring, a thiophene ring, and a pyridine ring from the viewpoint of the solubility, heat resistance, and hole injection 'transportability of the polymer compound. More preferred are a phenyl group and a naphthyl group.
- Ar 23 to Ar 25 are divalent groups derived from a benzene ring, a naphthalene ring, an anthracene ring, and a phenanthrene ring from the viewpoint of heat resistance and hole injection and transport properties including redox potential.
- Preferred phenylene groups, biphenylene groups, and naphthylene groups are more preferable.
- R 10 ⁇ R 1C> 2 a hydrogen atom or an arbitrary substituent is applicable. These may be the same or different from each other.
- the type of the substituent is not particularly limited. Examples of applicable substituents include alkyl groups, alkenyl groups, alkynyl groups, alkoxy groups, silyl groups, siloxy groups, aromatic hydrocarbon groups, aromatic heterocyclic groups. And a halogen atom. Specific examples thereof include the groups exemplified in the above substituent group D.
- aromatic tertiary amine polymer compound having a repeating unit represented by the general formula (VII) include those described in WO2005Z089024, and preferred examples thereof are also included.
- the compound (PB-1) represented by the following structural formula is exemplified, but the present invention is not limited thereto.
- aromatic tertiary amine polymer compounds include, for example, the following general formula (VIII) and
- Examples thereof include a polymer compound containing a repeating unit represented by Z or general formula (IX).
- Ar 45 , Ar 47 and Ar 48 may each independently have a substituent.
- Ar 44 and Ar 46 each independently represents a divalent aromatic hydrocarbon group which may have a substituent, or a divalent aromatic heterocyclic group which may have a substituent.
- Ar 45 to Ar 48 two groups bonded to the same N atom may be bonded to each other to form a ring.
- R m to R 113 each independently represents a hydrogen atom or an arbitrary substituent.
- Ar 45 , Ar 47 , Ar 48 and Ar 44 , Ar 46 may include Ar 21 , Ar 22 and Ar 23 to Ar 25 .
- R m to R 113 are preferably a hydrogen atom or a substituent described in [Substituent group D], more preferably a hydrogen atom, an alkyl group, an alkoxy group, an amino group, an aromatic hydrocarbon group, It is an aromatic hydrocarbon group.
- aromatic tertiary amine polymer compound containing the repeating unit represented by the general formula (VIII) and Z or (IX) include those described in WO2005Z089024, and preferred examples thereof. Is the same, but is not limited thereto.
- a hole transporting compound that is easily dissolved in various solvents is preferable.
- the aromatic tertiary amine compound for example, a binaphthyl compound (Japanese Patent Laid-Open No. 2004-014187) and an asymmetric 1,4-phenylenediamine compound (Japanese Patent Laid-Open No. 2004-026732) are preferred.
- aromatic amine compounds that have been conventionally used as thin film refining materials having hole injection and transport properties in organic electroluminescent devices, compounds that are easily dissolved in various solvents may be appropriately selected. Good.
- aromatic amine compound applicable to the hole transporting compound of the hole injection layer for example, it has been conventionally used as a layer forming material for hole injection and transporting in organic electroluminescence devices. A well-known compound is mentioned.
- aromatic diamine compounds in which tertiary aromatic amine units such as 1, 1 bis (4-di-P-triamylaminophenol) cyclohexane are linked JP-A-59-194393
- 4 , 4'-bis [N- (1-naphthyl) -N-phenolamino] biphenyl, which contains two or more tertiary amines, and two or more condensed aromatic rings are attached to the nitrogen atom.
- Substituted aromatic amine compounds JP-A-5-234681; derivatives of triphenylbenzene and aromatic triamine compounds having a starburst structure (US Pat. No.
- N N, —Diphenyl—N, N, —Bis (3-methylphenol) bi-fluoro 4,4, aromatic diamine compounds such as diamine (US Pat. No. 4,764,625); ⁇ , ⁇ , ⁇ ', ⁇ , monotetramethyl ⁇ , ⁇ , monobis (4 di ( ⁇ tolyl) aminophenyl) - ⁇ xylene (Japanese Patent Laid-Open No.
- a sterically asymmetric triphenylamine derivative as a whole molecule JP-A-4-129271; a compound in which a plurality of aromatic diamino groups are substituted on a pyrenyl group (JP-A-4-175395); ethylene Aromatic diamine compounds in which tertiary aromatic amine units are linked by a group (JP-A-4-264189); aromatic diamines having a styryl structure (JP-A-4-290851); thiophene groups Compound obtained by linking aromatic tertiary amine units (JP-A-4-304466); Starburst type aromatic triamine compound (JP-A-4-308688); benzylphenol compound (JP-A-4-308688) 4-364153); a compound in which a tertiary amine is linked by a fluorene group (JP-A-5-25473); a triamine compound (JP-A-5-239455); a bis-dip
- phthalocyanine derivative or porphyrin derivative applicable to the hole transporting compound in the hole injection layer include porphyrin, 5, 10, 15, 20-tetraphenyl 21H. , 23H Porphyrin, 5, 10, 15, 20—Tetraphenol— 21H, 23H —Porphyrin cobalt (11), 5, 10, 15, 20—Tetraferro-Lu 21H, 23H Porphyrin copper (11), 5, 10 , 15, 20—Tetraphenol—21H, 23H Porphyrin zinc ( ⁇ ), 5, 10, 15, 20—Tetraferroic 21H, 23H Porphyrin vanadium (IV) oxide, 5, 10, 15, 20—Tetra (4 Pyridyl) -21H, 23H porphyrin, 29H, 31H phthalocyanine copper ( ⁇ ), phthalocyanine zinc (11), phthalocyanine titanium, phthalocyanine oxide magnesium, phthalocyanine lead, phthalocyanine copper (11), 4, 4, 4
- examples thereof include oligothiophene derivatives (JP-A-6-256341).
- a polythiophene derivative applicable as a hole-transporting compound in the present invention Preferred specific examples include poly (3,4-ethylenedioxythiophene) (PEDOT), poly (3-hexylthiophene) and the like.
- the molecular weights of these hole transportable compounds are usually 9000 or less, preferably 5000 or less, except for polymer compounds (polymerizable compounds in which repeating units are linked).
- the range is usually 200 or more, preferably 400 or more. If the molecular weight of the hole transporting compound is too high, synthesis and purification are difficult, which is not preferable. On the other hand, if the molecular weight is too low, the heat resistance may be lowered, which is also not preferable.
- the hole transporting compound used as the material for the hole injection layer may contain one or more of these compounds, and may contain two or more kinds. Also good. When two or more kinds of hole transporting compounds are contained, the combination thereof is arbitrary, but one or more aromatic tertiary amine polymer compounds and one other hole transporting compound are used. Or it is preferable to use 2 or more types together.
- An electron-accepting compound is preferably a compound having an oxidizing power and the ability to accept one electron from the above-described hole-transporting compound. Specifically, a compound having an electron affinity of 4 eV or more is used. Preferred is a compound that is a compound of 5 eV or more.
- Examples include 4-isopropyl-1,4'-methyldiphenyl-tetrakis (pentafluorophenol) borate and other organic group-substituted onium salts, salted iron (III) ( JP-A-11-251067), high-valence inorganic compounds such as ammonium peroxodisulfate, cyano-compounds such as tetracyanethylene, tris (pentafluorophenyl) borane (JP-A-2003-31365), etc. Aromatic boron compounds, fullerene derivatives, iodine and the like.
- onium salts substituted with organic groups and high-valent inorganic compounds are soluble in various solvents and are applicable to wet coating because they have strong acid-like properties.
- an organic salt-substituted onium salt, a cyan compound, and an aromatic boron compound are preferable.
- organically substituted onium salts, cyan compounds, and aromatic boron compounds suitable as electron-accepting compounds include those described in WO2005Z089024, and preferred examples thereof are also included.
- the compound (A-2) represented by the following structural formula is listed, but it is not limited thereto.
- the cation radical compound is a cation radical that is a chemical species obtained by removing one electron from a hole transporting compound, and an ionic compound that also has an anti-ion force.
- the cation radical when the cation radical is derived from a hole transporting polymer compound, the cation radical has a structure in which one electron of a repeating unit force of the polymer compound is removed.
- the cation radical is a chemical compound obtained by removing one electron from the above-described compound in the hole transporting compound, and more preferably as a hole transporting compound which is preferably a chemical species. It is more preferable to be a chemical species from the viewpoints of amorphousness, visible light transmittance, heat resistance, and solubility.
- the cation radical compound can be generated by mixing the hole transport compound and the electron acceptor compound described above. That is, by mixing the aforementioned hole transporting compound and the electron accepting compound, electron transfer occurs from the hole transporting compound to the electron accepting compound, and the cation radical of the hole transporting compound is produced. A cationic ion compound with a counter-on force is generated.
- Cationic labs derived from polymer compounds such as PEDOT / PSS Advanced Mater., 2000, 12 ⁇ , 481) Jameraldine hydrochloride (J. Phys. Chem., 1990, 94 ⁇ , 7716)
- Dical compounds are also produced by acid-sodium polymerization (dehydrogenation polymerization), that is, by oxidizing a monomer chemically or electrochemically with peroxysulfate in an acidic solution. To do.
- this oxidative polymerization dehydrogenation polymerization
- the monomer is oxidized to increase the molecular weight, and one electron from a polymer repeating unit, which is a key ion derived from an acidic solution.
- the removed cation radical is generated.
- the hole injection layer 3 is formed on the anode 2 by a wet film forming method or a vacuum deposition method.
- ITO indium stannate
- ITO indium stannate
- Ra roughness
- the defect of the device due to the unevenness of the surface of the anode is generated compared to the case of forming by the vacuum deposition method. Has the advantage of reducing.
- a predetermined amount of one or more of the above-mentioned materials is added, Do not become a trap of charge if necessary! / ⁇ Binder ⁇
- a coating improver and dissolve in a solvent to prepare a coating solution, spin coat, spray coat, dip coat, die coat, flexo
- the positive hole injection layer 3 is formed by applying on the anode by a wet film formation method such as printing, screen printing, or ink jet method, and drying.
- the solvent used for the layer formation by the wet film-forming method the above-mentioned materials (hole transporting compound, electron accepting compound, cation radical compound) can be dissolved. If it is a solvent, the type is not particularly limited, but a deactivating substance that may deactivate each material (hole transporting compound, electron accepting compound, cation radical compound) used for the hole injection layer. Or prefer something that doesn't contain deactivating material.
- Examples of preferable U and solvent that satisfy these conditions include ether solvents and ester solvents.
- the ether solvent include aliphatic ethers such as ethylene glycolenoresmethinoleatenore, ethyleneglycololecinoleethenore, propylene glycol 1 monomethyl ether acetate (PGMEA); , 2-dimethoxybenzene, 1,3 dimethoxybenzene, anisole, phenetole, 2-methoxytoluene, 3-methoxytoluene, 4-methoxytoluene, 2,3 dimethylaninol, 2,4 dimethylarsole, etc.
- ether solvent include aliphatic ethers such as ethylene glycolenoresmethinoleatenore, ethyleneglycololecinoleethenore, propylene glycol 1 monomethyl ether acetate (PGMEA); , 2-dimethoxybenzene, 1,3 dimethoxybenzene, anisole, phenetole
- ester solvent examples include aliphatic ethers such as ethyl acetate, n-butyl acetate, ethyl acetate, and n-butyl lactate. Steal; aromatic esters such as acetate acetate, propionate, methyl benzoate, ethyl benzoate, propyl benzoate and n-butyl benzoate. Any one of these may be used alone, or two or more may be used in any combination and ratio.
- Solvents that can be used in addition to the ether solvents and ester solvents described above include, for example, aromatic hydrocarbon solvents such as benzene, toluene, xylene, N, N-dimethylformamide, N, N-dimethyl. Examples include amide solvents such as acetoamide, dimethyl sulfoxide and the like. Any of these may be used alone, or two or more may be used in any combination and ratio. Further, one or more of these solvents may be used in combination with one or more of the ether solvents and ester solvents described above.
- aromatic hydrocarbon solvents such as benzene, toluene, xylene, N, N-dimethylformamide, N, N-dimethyl.
- amide solvents such as acetoamide, dimethyl sulfoxide and the like. Any of these may be used alone, or two or more may be used in any combination and ratio. Further, one or more of these solvents may be used in combination with one or more of the
- aromatic hydrocarbon solvents such as benzene, toluene and xylene have low ability to dissolve electron-accepting compounds and cation radical compounds, so they are mixed with ether solvents and ester solvents. It is preferable to use it.
- the concentration of the solvent in the coating solution is usually 10% by weight or more, preferably 30% by weight or more, more preferably 50% by weight or more, and usually 99.999% by weight or less, preferably 99.99%. It is in the range of not more than wt%, more preferably not more than 99.9 wt%. When two or more solvents are used as a mixture, the total force S of these solvents must satisfy this range.
- one or more of the aforementioned materials are placed in a vacuum vessel.
- Place the crucibles in the crucibles (in case of using more than 2 kinds of materials, put them in each crucible), evacuate the vacuum container to about 10 _4 Pa with a suitable vacuum pump, and then heat the crucibles
- heat each crucible and evaporate by controlling the amount of evaporation (when using two or more materials, evaporate by independently controlling the amount of evaporation) and face the crucible
- a hole injection layer is formed on the anode of the substrate placed on the substrate.
- a mixture of them can be put in a crucible and heated and evaporated to form a hole injection layer.
- the thickness of the hole injection layer 3 formed in this way is usually in the range of 5 nm or more, preferably 1 Onm or more, and usually lOOOnm or less, preferably 500 nm or less.
- the hole injection layer 3 may be omitted as shown in FIG.
- a light emitting layer 4 is usually provided on the hole injection layer 3.
- the light-emitting layer 4 is a layer containing a light-emitting material. Between the electrodes to which an electric field is applied, holes injected from the anode 2 through the hole injection layer 3 and electrons injected from the cathode 6 through the electron transport layer 5 are used. It is a layer that is excited by recombination with the main light source.
- the light emitting layer 4 preferably contains a light emitting material (dopant) and one or more host materials, and the light emitting layer 4 more preferably contains the charge transport material of the present invention as a host material. Although it may be formed by a method, a layer produced by a wet film-forming method using the composition for a charge transport material of the present invention is particularly preferred.
- the wet film-forming method is a method for applying the composition for a charge transport material of the present invention containing the above-mentioned solvent by spin coating, spray coating, dip coating, die coating, flexographic printing, screen printing, or inkjet method. To form a film.
- the light emitting layer 4 may contain other materials and components as long as the performance of the present invention is not impaired.
- the organic layer such as the hole injection layer 3 and the electron transport layer 5 described later is provided in addition to the light emitting layer 4, the light emitting layer 4, the hole injection layer 3, the electron transport layer 5, etc.
- the total film thickness combined with other organic layers is usually 30 nm or more, preferably 50 nm or more, more preferably 1 OO nm or more, usually lOOOnm or less, preferably 500 nm or less, more preferably 3 OOnm or less.
- the conductivity of the hole injection layer 3 other than the light emitting layer 4 or the electron injection layer 5 described later is high, the amount of charge injected into the light emitting layer 4 increases.
- the thickness of the light emitting layer 4 is usually 10 nm or more, preferably 20 nm or more, and usually 300 ⁇ m or less, preferably 200 nm or less.
- the film thickness of the light emitting layer 4 is usually 30 nm or more, preferably 50 nm or more, usually 500 nm or less, preferably 300 nm or less. It is.
- the electron injection layer 5 serves to efficiently inject electrons injected from the cathode 6 into the light emitting layer 4.
- the material for forming the electron injection layer 5 is an alkali metal such as sodium or cesium, which is preferable for a metal having a low work function, or an alkaline earth metal such as norium or calcium.
- the film thickness of the electron injection layer 5 is preferably 0.1 to 5 nm.
- organic electron transport materials typified by metal complexes such as nitrogen-containing heterocyclic compounds such as bathophenantorin described later and aluminum complexes of 8-hydroxyquinoline are described as sodium.
- Electron injection by doping with an alkali metal such as potassium, cesium, lithium, or rubidium (described in JP-A-10-270171, JP-A-2002-100478, JP-A-2002-100482, etc.) It is preferable because the transportability is improved and excellent film quality can be achieved.
- the film thickness is usually 5 nm or more, preferably 10 nm or more, and usually 200 nm or less, preferably lOOnm or less.
- the electron injection layer 5 is formed by laminating on the light emitting layer 4 by a wet film forming method or a vacuum deposition method in the same manner as the light emitting layer 4.
- the evaporation source is placed in a crucible or metal boat installed in a vacuum vessel, the inside of the vacuum vessel is evacuated to about 10 _4 Pa with an appropriate vacuum pump, and then the crucible or metal boat is heated. Then, it is evaporated to form an electron injection layer on the substrate placed facing the crucible or metal boat.
- the alkali metal is deposited using an Al metal dispenser in which nichrome is filled with an alkali metal chromate and a reducing agent. Heating this dispenser in a vacuum vessel Thus, the alkali metal chromate is reduced and the alkali metal is evaporated.
- an organic electron transport material and an alkali metal place the organic electron transport material in a crucible installed in a vacuum vessel and evacuate the vacuum vessel to about 10 _4 Pa with a suitable vacuum pump. Each crucible and dispenser are simultaneously heated and evaporated to form an electron injection layer on the substrate placed facing the crucible and dispenser.
- the electron injection layer 5 may be omitted as shown in FIGS.
- the cathode 6 serves to inject electrons into a layer on the light emitting layer side (such as the electron injection layer 5 or the light emitting layer 4).
- the material used for the cathode 6 can be the material used for the anode 2, but a metal having a low work function is preferred for efficient electron injection.
- Tin, magnesium, indium, calcium A suitable metal such as aluminum, silver, or an alloy thereof is used.
- Specific examples include low work function alloy electrodes such as magnesium-silver alloy, magnesium-indium alloy, and aluminum-lithium alloy.
- the film thickness of the cathode 6 is usually the same as that of the anode 2.
- a cathode made of a low work function metal further laminating a metal layer having a high work function and stable to the atmosphere on the cathode increases the stability of the device.
- metals such as aluminum, silver, copper, nickel, chromium, gold and platinum are used.
- the element having the layer structure shown in FIG. 1 has been mainly described.
- an arbitrary layer may be provided, and any layer other than the light emitting layer 4 may be omitted.
- Examples of the layer that may be included include the electron transport layer 7.
- the electron transport layer 7 is provided between the light emitting layer 4 and the electron injection layer 5 as shown in FIG. 2 for the purpose of further improving the light emission efficiency of the element.
- the electron transport layer 7 is formed of a compound capable of efficiently transporting electrons injected from the cathode 6 between the electrodes to which an electric field is applied in the direction of the light emitting layer 4.
- an electron transporting compound used for the electron transport layer 7 the electron injection efficiency from the cathode 6 or the electron injection layer 5 is high, and the injected electrons are transported efficiently with high electron mobility. It must be a compound that can
- Metal complexes such as aluminum complexes of 8-hydroxyquinoline (Japanese Patent Laid-Open No. 59-194393), metal complexes of 10-hydroxybenzo [h] quinoline, oxadiazole derivatives, distyryl biphenyl. Derivatives, silole derivatives, 3- or 5-hydroxyflavone metal complexes, benzoxazole metal complexes, benzothiazole metal complexes, trisbenzimidazolylbenzene (US Pat. No.
- quinoxaline compounds JP-A-6-207169
- phantom phosphorus derivatives JP-A-5 331459
- 2t-butinole 9 10-N, N, dicyananoanthraquinonediimine
- n-type hydrogenated amorphous Examples include silicon carbide, n-type zinc sulfide, and n-type selenium zinc.
- the thickness of the electron transport layer 7 is usually 1 nm, preferably about 5 nm, and the upper limit is usually about 300 nm, preferably about 10 nm.
- the electron transport layer 7 is formed by laminating on the light emitting layer 4 by the wet film forming method or the vacuum vapor deposition method in the same manner as the hole injection layer 3. Usually, a vacuum deposition method is used.
- the hole transport layer 10 which preferably has the hole transport layer 10 in the present invention preferably contains the charge transport material of the present invention.
- the compounds exemplified as the hole transportability compound of the hole injection layer can also be used.
- a polymer material such as polyarylene ether sulfone containing polybutacarbazole, polybutyltriamine, tetraphenylpentidine may be used.
- the hole transport layer 10 is formed by laminating these materials on the hole injection layer by a wet film forming method or a vacuum deposition method.
- the thickness of the hole transport layer 10 thus formed is usually 10 nm or more, preferably 30 nm. However, it is usually 300 nm or less, preferably lOOnm or less.
- Hole blocking layer 8 is hole And has the function of confining the electrons in the light emitting layer 4 and improving the light emission efficiency. That is, the hole blocking layer 8 is generated by increasing the probability of recombination with electrons in the light emitting layer 4 by blocking the holes moving from the light emitting layer 4 from reaching the electron transport layer 7. There are a role of confining excitons in the light emitting layer 4 and a role of efficiently transporting electrons injected from the electron transport layer 8 toward the light emitting layer 4.
- the hole blocking layer 8 serves to block the holes moving from the anode 2 from reaching the cathode 6, and efficiently transports the electrons injected from the cathode 6 toward the light emitting layer 4.
- the compound that can be formed is laminated on the light emitting layer 4 so as to be in contact with the interface of the light emitting layer 4 on the cathode 6 side.
- the physical properties required of the material constituting the hole blocking layer 8 include high electron mobility and low hole mobility, a large energy gap (difference between HOMO and LUMO), and excited triplet levels. (T1) is high.
- mixed ligands such as bis (2-methyl-8 quinolinolato) (phenolato) aluminum, bis (2-methyl-8 quinolinolato) (triphenylsilanolato) aluminum, etc.
- metal complexes such as bis (2-methyl-8quinolato) aluminum 1 ⁇ -oxo-bis- (2 methyl-8quinolinato) aluminum binuclear metal complexes, and styryl compounds such as distyrylbiphenyl derivatives (JP-A-11 242996), 3 — (4 Biphenyl) — 4—Ferru 5 (4—tert-Butylphenol) — Triazole derivatives such as 1, 2, 4 Triazole (JP-A-7-41759), and anthroline such as bathocuproine Derivatives (Japanese Patent Laid-Open No. 10-79297).
- styryl compounds such as distyrylbiphenyl derivatives (JP-A-11 242996), 3 — (4 Biphenyl) — 4—Ferru 5 (4—tert-Butylphenol) — Triazole derivatives such as 1, 2, 4 Triazole (JP-A-7-41759), and anthroline such as bathocupro
- the thickness of the hole blocking layer 8 is usually 0.3 nm or more, preferably 0.5 nm or more, and usually ⁇ m or less, preferably 50 nm or less.
- the hole blocking layer 8 can also be formed by the same method as the hole injection layer 3, but usually a vacuum evaporation method is used.
- the electron transport layer 7 and the hole blocking layer 8 may be provided as necessary. 1) Only the electron transport layer, 2) Only the hole block layer, 3) The hole block layer Z electron transport Layer stack, 4) not use, Etc., there is usage. Further, the electron injection layer 5 as shown in FIG. 7 may be omitted and the hole blocking layer 8 and the electron transport layer 7 may be laminated, or only the electron transport layer 7 as shown in FIG.
- the hole blocking layer 8 it is also effective to provide an electron blocking layer 9 between the hole injection layer 3 and the light emitting layer 4 as shown in FIG.
- the electron blocking layer 9 prevents the electrons moving from the light emitting layer 4 from reaching the hole injection layer 3, thereby increasing the probability of recombination with holes in the light emitting layer 4 and generating excitons. In the light emitting layer 4 and efficiently transports holes injected from the hole injection layer 3 in the direction of the light emitting layer 4.
- the characteristics required for the electron blocking layer 9 include a high energy gap (difference between HOMO and LUMO) with high hole transportability and a high excited triplet level (T1). Further, when the light emitting layer 4 is formed by a wet film forming method, it is preferable that the electron blocking layer 9 is also formed by a wet film forming method because the device can be easily manufactured.
- the electron blocking layer 9 also has wet film forming compatibility.
- the material used for such an electron blocking layer 9 include dioctylfluorene and triphenyl represented by F8-TFB. -Lumamine copolymer (described in WO2004Z084260).
- the structure opposite to that shown in Fig. 1, that is, the cathode 6, the electron injection layer 5, the light emitting layer 4, the hole injection layer 3, and the anode 2 can be laminated on the substrate 1 in this order.
- the organic electroluminescent element of the present invention between two substrates, at least one of which has high transparency.
- Sarako may have a structure in which a plurality of layers shown in FIG. 1 are stacked (a structure in which a plurality of light emitting units are stacked).
- V 2 O is used as the charge generation layer (CGL).
- the barrier between the stages is reduced, and the viewpoint power of the light emission efficiency 'drive voltage is more preferable.
- the present invention is effective in shifting the organic electroluminescent element from a single element, an element having a structure arranged in an array, and a structure in which an anode and a cathode power are arranged in a Y matrix! However, it can be applied.
- the glass transition temperature was determined by DSC measurement
- the vaporization temperature was determined by TG DTA measurement
- the melting point was determined by DSC measurement or TG-DTA measurement.
- Target 1 (8. 01g), 2 Hydroxybenzimidazole (1.04g), Copper powder in nitrogen stream
- This had a glass transition temperature of 146 ° C, a melting point of 355 ° C, and a vaporization temperature of 507 ° C.
- the energy difference between the excited triplet state and the ground state of this product was 3.04 eV.
- target 3 (4. 36 g), force rubazole (5.76 g), copper powder (1.88 g), carbonated lithium (8. 15 g), tetraglyme (20 ml), 210 ° Stir at C for 7.5 hours.
- the reaction mixture was mixed with black mouth form and stirred.
- the insoluble material was filtered off, added to methanol (200 ml), stirred, and the precipitate was collected by filtration.
- the obtained solid content was converted into a silica gel column chromatograph.
- the product was purified with a fee (toluene) and washed with a dichloromethane / methanol mixture solution to obtain the target compound 4 (2. 29 g).
- the energy difference between the excited triplet state and the ground state of this product was 2.99 eV.
- the glass transition temperature was 124 ° C, the melting point was not observed, and the vaporization temperature was 527 ° C. This dissolved in 5.0% by weight or more in toluene.
- This product had a glass transition temperature of 56 ° C, a melting point of 150 ° C, and a vaporization temperature of 391 ° C. This product was dissolved by 5.0% by weight or more in Tolene.
- target 8 (0. 860 g), target 7 (1.22 g), copper powder (0. 492 g), potassium carbonate (2.14 g), and tetraglyme (6 ml)
- the mixture was stirred at 200 ° C for 14 hours and then allowed to cool.
- chloroform was added, stirred for 30 minutes, insolubles were filtered off, the filtrate was concentrated, the precipitate was suspended and washed with ethanol, and silica gel column chromatography (n-hexane Z ethyl acetate mixed).
- the product 9 (0. 465 g) was obtained by suspension washing with an ethyl acetate Z ethanol mixed solution.
- the target product 12 (1.27 g) was obtained.
- the energy difference between the excited triplet state and the ground state of this product was 2.96 eV.
- Target 13 (1. 188 g), Target 10 (5. 125 g), CuI (2. 26 g), Carbonated Lithium (3.28 g), and anhydrous N, N-dimethylformamide ( 19 ml) was stirred for 6.2 hours under heating and reflux. Furthermore, the target product 10 (1.41 g), Cul (l. 15 g), and potassium carbonate (1.8 g) were further added thereto, and the mixture was stirred for 4.5 hours while heating under reflux. Methanol (30 ml) and water (30 ml) were added to the resulting solution, followed by filtration. The residue was poured into 150 ml of chloroform and stirred. Activated clay is added to the solution and stirred, followed by filtration.
- the filtrate is concentrated and purified by column chromatography on neutral spherical silica gel (developing solvent: hexane Z salt methylene), and then suspended in methanol. Purification by cloudy washing and hot washing in a mixed solvent of ethyl acetate and ethanol gave the target product 14 (2.164 g).
- This had a glass transition temperature of 126 ° C, a melting point of 282 ° C, and a vaporization temperature of 399 ° C.
- the energy difference between the excited triplet state and the ground state of this product was 2.97 eV.
- Target 15 (1. Og), N— (3-bromophenol) rubazole (6.8 g), Cul (2.8 g), potassium carbonate (4.2 g), and anhydrous in nitrogen stream
- a mixed solution of N, N-dimethylformamide (10 ml) was stirred with heating under reflux for 6.2 hours.
- the target product 10 (11.4 g), Cul (l. 15 g), and potassium carbonate (1.8 g) were further added thereto, and the mixture was stirred for 15 hours while heating under reflux.
- the reaction mixture was diluted with dichloromethane, filtered, washed with brine, 1N hydrochloric acid and dried over sodium sulfate.
- the product that became brown oil by concentration under reduced pressure was purified by silica gel column chromatography (developing solvent: toluene) and then purified by suspension washing in methanol to obtain the target product 16 (1. lg). Obtained.
- the energy difference between the excited triplet state and the ground state of this product was 2.99 eV.
- target 7 (1.6 g), 6, 6 "—jib mouth mor 2, 2 ,: 6, 2, 2" -terpyridine (1. Og), copper powder (0.35 g), Potassium carbonate (1.4 g) and tetraglyme (5 ml) were added to a 100 mL 4-necked flask, placed in a 170 ° C. oil bath, and stirred with heating for 13 hours.
- the yellowish white solid obtained by diluting with dichloromethane, filtering, and then distilling off under reduced pressure was heated and washed with tetrahydrofuran to give the desired product 17 (0.9 g) as a white powder.
- An organic electroluminescent device having the structure shown in FIG. 7 was produced by the following method.
- Anode 2 was formed by patterning into stripes of width.
- the patterned ITO substrate is cleaned in the order of ultrasonic cleaning with acetone, water with pure water, and ultrasonic cleaning with isopropyl alcohol, followed by drying with a nitrogen blow, and finally UV irradiation. Cleaning was performed.
- a non-conjugated polymer compound (PB-2) having an aromatic amino group having the structural formula shown below is used as an electron-accepting compound (A-2) having the structural formula shown below.
- Spin coating was performed under the following conditions.
- Weight average molecular weight 48900
- a uniform thin film having a thickness 30nm was formed by spin coating of the Next, the substrate on which the hole injection layer 3 was formed was placed in a vacuum evaporation apparatus. After roughly exhausting the apparatus with an oil rotary pump, the apparatus was evacuated with a cryopump until the vacuum in the apparatus was 9.8 X 10 _5 Pa (about 7.5 X 10 "7 Torr) or less.
- the arylene amine compound (H-1) of the following structural formula placed in a ceramic crucible placed in the above apparatus was heated with a tantalum wire heater around the crucible, and was deposited. The temperature of the crucible was controlled in the range of 300 to 314 ° C. Degree of vacuum during deposition 9.0 x 10 _5 Pa (about 6.9 x 10 " 7 Torr), Deposition rate was 0. InmZ seconds A hole transport layer 10 having a thickness of 40 nm was formed.
- the target compound synthesized in Example 2 as the main component (host material) of the light-emitting layer 4 was used as a subcomponent (dopant) of the structural formula shown below.
- the organic iridium complex (D-1) was placed in a separate ceramic crucible and deposited by the binary co-evaporation method.
- the crucible temperature of the organic compound (EM-1) of the present invention is 270 to 284 ° C, the deposition rate is 0. In m / sec, and the crucible temperature of the organic iridium complex (D-1) is 230 to 237 ° C.
- the light emitting layer 4 having a thickness of 30 nm and containing about 12.5 wt% of the organic iridium complex (D-1) was laminated on the hole transport layer 10 under the control of C.
- the degree of vacuum during the deposition 7.4X10 _5 Pa (about 5.7X10 Torr) with a thickness 7 this o
- a triarylbenzene derivative (HB-2) having the following structural formula was laminated at a crucible temperature of 343 to 350 ° C and a deposition rate of 0.09 nmZ seconds with a film thickness of lOnm. did.
- the degree of vacuum during deposition was 7. lX10 _5 Pa (about 5.5X 10 _7 Torr).
- a bath opening (ET-2) having the following structural formula was deposited as the electron transport layer 7 in the same manner.
- Crucible temperature at this time of bathocuproine (ET- 2) is adjusted in the range of 160 ⁇ 172 ° C, the vacuum degree during vapor deposition 6.6 ⁇ 10 _5 Pa (about 5.1X10 “Torr), the deposition rate was 0. InmZ seconds, and the film thickness was 30 nm.
- the substrate temperature during vacuum deposition of the hole transport layer 10, the light emitting layer 4, the hole blocking layer 8, and the electron transport layer 7 was kept at room temperature.
- the element on which the electron transport layer 7 has been deposited is once taken out into the atmosphere from the vacuum deposition apparatus, and a 2 mm wide striped shadow mask is used as the cathode deposition mask.
- the degree of vacuum in the apparatus is 2.8 X 10 _6 Torr (about 3.6 X 10 _ 4 Pa) was exhausted to below.
- LiF lithium fluoride
- a molybdenum Nboto deposition rate 0. 03NmZ seconds
- a vacuum degree of 2. 8 X 10 _6 Torr about 3. 7 X 10 "4Pa
- the cathode 6 was completed by forming an aluminum layer with a thickness of 80 nm at 3 ⁇ 10_3 Pa).
- the substrate temperature at the time of vapor deposition of the above two-layered cathode 6 was kept at room temperature.
- the electroluminescence of this device was blue-green light emission with a maximum wavelength of 473 nm and a half-value width of 67 nm, and it was identified as having an organic iridium complex (D-1) power.
- An organic electroluminescent device having the structure shown in FIG. 7 was produced in the same manner as in Example 11 except that the light emitting layer 4 was formed by the method described below.
- the target compound synthesized in Example 9 as the main component (host material) of the light-emitting layer 4 16 was placed in separate ceramic crucibles and deposited by the dual co-evaporation method.
- the crucible temperature of the organic compound (EM-3) of the present invention is 400 to 407 ° C, the deposition rate is 0. In m / sec, and the crucible temperature of the organic iridium complex (D-1) is 201 to 207 ° C.
- the light emitting layer 4 having a thickness of 30 nm and containing about 10.4 wt% of the organic iridium complex (D-1) was laminated on the hole transport layer 10 under the control of C.
- the degree of vacuum during deposition is 4.6 X 10 _5 Pa (approximately 3.5 X 10 Torr).
- the electroluminescence of this device was a blue-green light emission with a maximum wavelength of 471 nm and a half-value width of 53 nm, and was identified as having an organic iridium complex (D-1) power.
- Example 11 An organic electroluminescent device having the structure shown in FIG. 7 was produced by the following method.
- the organic iridium complex used in Example 11 as the subcomponent (dopant) of the organic compound (EM-4) of the present invention ( D-1) was placed in separate ceramic crucibles, and a film was formed by the binary co-evaporation method.
- the crucible temperature of the organic compound (EM-4) of the present invention is 217 to 242 ° C
- the deposition rate is 0.09 nmZ seconds
- the crucible temperature of the organic iridium complex (D-1) is 213 to 216 ° C.
- the light emitting layer 4 having a film thickness of 30 nm and containing about 13.1% by weight of the organic iridium complex (D-1) was laminated on the hole transport layer 10.
- the degree of vacuum during deposition is 5.0 X 10 _5 Pa (approximately 4.0 X 10 Torr).
- the electroluminescence of this device was blue-green light emission with a maximum wavelength of 472 nm and a half-value width of 53 nm, and was identified as having an organic iridium complex (D-1) power.
- An organic electroluminescent device having the structure shown in FIG. 7 was produced in the same manner as in Example 11 except that the light emitting layer 4 was formed by the method described below.
- the film was placed in a crucible and deposited by the binary simultaneous vapor deposition method.
- the crucible temperature of the force rubazole derivative (CBP) was controlled to 411-406 ° C, the deposition rate was 0.08 nm / sec, and the crucible temperature of the organic iridium complex (D-1) was controlled to 204-209 ° C.
- the light emitting layer 4 having a film thickness of 30 nm and containing about 13.1 wt% of the organic iridium complex (D-1) was laminated on the hole transport layer 10.
- the degree of vacuum during deposition is 3.8 X 10 _5 Pa (approximately 2.9 X 10—Torr), 7 pieces o
- the electroluminescence of this device was blue-green light emission with a maximum wavelength of 490 nm and a half-value width of 59 nm.
- An organic electroluminescent device having the structure shown in FIG. 7 was produced by the following method.
- Anode 2 was formed by patterning into stripes of width. Patterned ITO substrate is cleaned with acetone, washed with pure water, isopropyl alcohol. After cleaning in the order of ultrasonic cleaning with Cole, it was dried with nitrogen blow, and finally UV ozone cleaning was performed.
- a non-conjugated polymer compound (PB-1) having an aromatic amino group represented by the following structural formula (weight average molecular weight: 29400, number average molecular weight: 12600) is used as a material for the hole injection layer 3.
- the sample was spin-coated with the electron-accepting compound (A-2) used in Example 11 under the following conditions.
- a uniform thin film having a thickness of 30 nm was formed by the above spin coating.
- the substrate on which the hole injection layer 3 was formed was placed in a vacuum evaporation apparatus. After roughly exhausting the apparatus with an oil rotary pump, the apparatus was evacuated with a cryopump until the vacuum in the apparatus was 9.0 X 10 _5 Pa (about 6.8 X 10 "7 Torr) or less.
- the arylene amine compound (H-1) used in Example 11 placed in a ceramic crucible placed in the above apparatus was heated by a tantalum wire heater around the crucible, and was deposited. The temperature of the film was controlled in the range of 300 to 314 ° C. Degree of vacuum during deposition 9.3 X 10 _5 Pa (about 7.0 X 10 " 7 Torr), deposition rate was 0.1 nm / sec.
- a hole transport layer 10 having a thickness of 40 nm was formed.
- the target compound synthesized in Example 2 as the main component (host material) of the light-emitting layer 4 the organic compound (EM-1) of the present invention as a subcomponent (dopant) of the structural formula shown below Organic Iri
- the film complex (D-2) was placed in a separate ceramic crucible and deposited by the binary co-evaporation method.
- the crucible temperature of the organic compound (EM-1) of the present invention is 270 to 284 ° C
- the deposition rate is 0. In m / sec
- the crucible temperature of the organic iridium complex (D-2) is 245 to 246 °
- the light emitting layer 4 having a thickness of 30 nm and containing about 5.9 wt% of the organic iridium complex (D-2) was laminated on the hole transport layer 10 under the control of C.
- the degree of vacuum during deposition is 7.8 X 10 _5 Pa (approximately 5.9 X 10 "Torr).
- a fluoro-lidine derivative (HB-1) having the structural formula shown below was formed at a crucible temperature of 343 to 350 ° C, a deposition rate of 0.09 nmZ seconds, and a film thickness of lOnm. It was stacked with. The degree of vacuum during deposition was 7. l X 10 _5 Pa (about 5. 5 X 10 _7 Torr).
- tris (8-hydroxyquinolinato) aluminum (Alq3) having the following structural formula was deposited on the hole blocking layer 8 as the electron transport layer 7 in the same manner.
- the temperature of the crucible of tris (8-hydroxyquinolinato) aluminum (Alq3) is controlled in the range of 296-300 ° C, and the degree of vacuum during deposition is 6.6 X 10 _5 Pa (about 5.1 X 10 _7 Torr), deposition rate is 0.15m
- the film thickness was 30 nm in Z seconds.
- the substrate temperature during vacuum deposition of the hole transport layer 10, the light emitting layer 4, the hole blocking layer 8 and the electron transport layer 7 was kept at room temperature.
- the electroluminescence of this device was green light with a maximum wavelength of 514 nm and a half-value width of 70 nm, and was identified as having an organic iridium complex (D-2) power.
- An organic electroluminescent device having the structure shown in FIG. 7 was produced in the same manner as in the method shown in Example 14 except that the light emitting layer 4 was formed by the method described below.
- the target compound synthesized in Example 6 as the main component (host material) of the light-emitting layer 4 11 The organic compound (EM-5) of the present invention was used as the secondary component (dopant) and the organic iridium complex (Example 14) D-2) was placed in separate ceramic crucibles, and a film was formed by the binary co-evaporation method.
- the organic compound (EM-5) of the present invention was used as the secondary component (dopant) and the organic iridium complex (Example 14) D-2) was placed in separate ceramic crucibles, and a film was formed by the binary co-evaporation method.
- the vapor deposition rate of the organic compound (EM-5) of the present invention was controlled at 0. InmZ seconds, and the crucible temperature of the organic iridium complex (D-2) was controlled at 257 to 255 ° C.
- the light emitting layer 4 containing about 6.2% by weight of iridium complex (D-2) was laminated on the hole transport layer 10.
- the degree of vacuum at the time of deposition was 1.5 X 10 _4 Pa.
- the electroluminescence of this device was green light with a maximum wavelength of 513 nm and a half-value width of 68 nm, and was identified as having an organic iridium complex (D-2) power.
- An organic electroluminescent device having the structure shown in FIG. 7 was produced by the following method in the same manner as in Example 14 except that the hole transport layer 10 and the light emitting layer 4 were formed by the method described below. did.
- the substrate on which the hole injection layer 3 was formed was placed in a vacuum deposition apparatus. After roughly evacuating the above device with an oil rotary pump, it was evacuated with a cryopump until the vacuum in the device was 5.3 X 10 _5 Pa (approximately 4.0 X 10 " 7 To rr) or less.
- Deposition was carried out by heating an arylamine compound (PPD) of the following structural formula placed in a ceramic crucible located in the above apparatus with a tantalum wire heater around the crucible. The temperature of the film was controlled in the range of 260 to 272 ° C. Degree of vacuum during deposition 6.0 X 10 _5 Pa (about 4. 9 X 10 " ? Torr), deposition rate was 0.1 nm, second in film thickness A 40 nm hole transport layer 10 was formed.
- PPD arylamine compound
- the target compound synthesized in Example 1 as the main component (host material) of the light-emitting layer 4 The organic compound (EM-6) of the present invention used in Example 14 as the accessory component (dopant).
- the complex (D-2) is placed in a separate ceramic crucible and deposited by the binary co-evaporation method.
- the deposition rate of the organic compound (EM-6) of the present invention was 0. InmZ seconds, and the organic iridium complex
- the crucible temperature of (D-2) was controlled at 268 to 270 ° C, respectively, and the light emitting layer 4 containing about 6.1% by weight of the organic iridium complex (D-2) with a film thickness of 30 nm was added to the hole transport layer. Laminated on top of 10. The degree of vacuum during vapor deposition 6. was 3 X 10 _5 Pa (about 4. 7 X 10 _7 Torr).
- the electroluminescence of this device was green light with a maximum wavelength of 513 nm and a half-value width of 69 nm, and it was identified as having an organic iridium complex (D-2) power.
- An organic electroluminescent device having the structure shown in FIG. 7 was produced in the same manner as in the method shown in Example 14 except that the light emitting layer 4 was formed by the method described below.
- Separate ceramic crucibles are the power rubazole derivative (SiM CP) shown in the following structural formula as the main component (host material) of the light-emitting layer 4 and the organic iridium complex (D-2) used in Example 14 as the subcomponent (dopant).
- the film was formed by the binary simultaneous vapor deposition method.
- the deposition rate of the strong rubazole derivative (SiMCP) was controlled at 0. InmZ seconds, and the crucible temperature of the organic iridium complex (D-2) was controlled at 268 to 270 ° C.
- the light emitting layer 4 containing about 5.9% by weight of D-2) was laminated on the hole transport layer 10.
- the degree of vacuum during vapor deposition 6. was 3 X 10 _5 Pa (about 4. 7 X 10 _7 Torr).
- the electroluminescence of this device was a green light with a maximum wavelength of 513 nm and a half-value width of 70 nm, and was identified as having an organic iridium complex (D-2) power.
- Table 4 shows the luminance after 40 seconds of energization, the luminance immediately after energization, and the value obtained by dividing the luminance value after 40 seconds of energization by the luminance value immediately after energization.
- An organic electroluminescence device having the structure shown in FIG. 7 was produced by the following method in the same manner as in Example 14 except that the hole transport layer 10 and the light emitting layer 4 were formed by the method described below. did.
- the substrate on which the hole injection layer 3 was formed was placed in a vacuum deposition apparatus. After roughly evacuating the above device using an oil rotary pump, the device was evacuated using a cryopump until the vacuum inside the device was 7.5 X 10 _5 Pa (approximately 5.6 X 10 " ? To rr) or less.
- the organic compound (EM-7) of the present invention is heated with a tantalum wire heater around the crucible. and. vacuum degree 7. 0 X 10 during the deposition _5 subjected to vapor deposition Pa, the deposition rate was obtained a hole transport layer 10 of thickness 40nm with 0. lnm / sec.
- the organic iridium complex (D-2) used in Example 14 as a sub-component (dopant) was placed in a separate ceramic crucible, and a film was formed by a binary co-evaporation method.
- Crucible temperature of force rubazole derivative (E-1) is 300-304 ° C
- deposition rate is 0.08nm / sec
- crucible temperature of organic iridium complex (D-2) is 239-242 ° C, respectively
- the light emitting layer 4 having a thickness of 30 nm and containing 6.4 wt% of the organic iridium complex (D-2) was laminated on the hole transport layer 10.
- the degree of vacuum during the deposition was 6.6 X 10 _5 Pa.
- the electroluminescence of this device was green light with a maximum wavelength of 513 nm and a half-value width of 69 nm, and it was identified as having an organic iridium complex (D-2) power.
- An organic electroluminescent element having the structure shown in FIG. 7 was produced in the same manner as in the method shown in Example 18 except that the hole transport layer 10 was formed by the method described below.
- the arylene amine compound (PPD) having the structural formula shown below was placed in a ceramic crucible and heated by a tantalum wire heater around the crucible for vapor deposition. The degree of vacuum during the evaporation was 6. OX 10 _5 Pa, the deposition rate was controlled at 0. 08-0. 13nmZ seconds, to obtain a hole transport layer 10 having a thickness of 40 nm.
- the electroluminescence of this device was green light with a maximum wavelength of 513 nm and a half-value width of 67 nm, and was identified as having an organic iridium complex (D-2) power.
- An organic electroluminescent device having the structure shown in FIG. 7 was produced by the following method.
- the target compound synthesized in Example 2 as the main component (host material) of the light-emitting layer 4 4 present
- the organic iridium complex (Facial body: D-3, where Me is a methyl group) having the structural formula shown below is placed in a separate ceramic crucible as an accessory component (dopant).
- the film was formed by the binary simultaneous vapor deposition method.
- the crucible temperature of the organic compound (EM-1) of the present invention is 277 to 283 ° C
- the deposition rate is 0.07 nm / sec
- the crucible temperature of the organic iridium complex (D-3) is 279 to 281 ° C.
- the light emitting layer 4 having a thickness of 30 nm and containing about 5.8 wt% of the organic iridium complex (D-3) was laminated on the hole transport layer 10 under the control of C.
- the degree of vacuum during deposition is 5.0 X 10 _5 Pa (approximately 3.8 X 10 "Torr).
- the hole blocking layer 8 only the organic compound (EM-1) of the present invention was laminated with a crucible temperature of 283 to 297 ° C and a film thickness of lOnm at a deposition rate of 0.09 nmZ seconds.
- the degree of vacuum during deposition is 4. was 5 X 10 _5 Pa (about 3. 4 X 10 _7 Torr).
- bathocuproine (ET-2) used in Example 11 was deposited on the hole blocking layer 8 as the electron transport layer 7 in the same manner.
- the crucible temperature of bathocuproine (ET-2) at this time is controlled in the range of 162 to 183 ° C, and the vacuum during deposition is 4.4 X 10 _5 Pa (approximately 3.3 X 10 " 7 Torr).
- the speed was set to 0.09 nmZ seconds and the film thickness was set to 30 nm.
- the substrate temperature at the time of vacuum deposition of the hole transport layer 10, the light emitting layer 4, the hole blocking layer 8 and the electron transport layer 7 was kept at room temperature.
- the electroluminescence of this device was blue emission with a maximum wavelength of 403 nm, and it was identified as having an organic iridium complex (D-3) power.
- An organic electroluminescent device having the structure shown in FIG. 7 was produced by the following method.
- the target product synthesized in Example 6 as the main component (host material) of the light-emitting layer 4 11 present
- the organic iridium complex (D-1) used in Example 11 was placed in a separate ceramic crucible as the organic compound (EM-5) of the invention as a subsidiary component (dopant), and a film was formed by binary co-evaporation. went.
- the deposition rate of the organic compound (EM-5) of the present invention is 0. InmZ seconds, and the organic iridium complex is
- the crucible temperature of (D-1) was controlled at 252 to 260 ° C, respectively, and the light-emitting layer 4 containing about 7.6% by weight of the organic iridium complex (D-1) with a film thickness of 33 nm was added to the hole transport layer. Laminated on top of 10. The degree of vacuum during deposition was 4.2 X 10 _5 Pa.
- the ferruleidine derivative (HB-1) used in Example 14 was set to a crucible temperature of 340 to 341 ° C, and a deposition rate of 0.08 to 0.09 nmZ for 5 nm. Laminated with film thickness. The degree of vacuum at the time of deposition was 4.6 X 10 _5 Pa.
- the electroluminescence of this device was blue-green light emission with a maximum wavelength of 471 nm and a half-value width of 66 nm, and was identified as having an organic iridium complex (D-1) power.
- An organic electroluminescence device having the structure shown in FIG. 3 (however, an electron injection layer is not required! /) was fabricated by the following method.
- ITO indium stannate oxide
- Anode 2 was formed by patterning into stripes of width.
- the patterned ITO substrate is cleaned in the order of ultrasonic cleaning with acetone, water with pure water, and ultrasonic cleaning with isopropyl alcohol, followed by drying with a nitrogen blow, and finally UV irradiation. Cleaning was performed.
- the hole injection layer 3 was formed in the same manner as in Example 11 except that the drying conditions at the time of spin coating were 230 ° C and 180 minutes.
- the light emitting layer 4 was formed on the hole injection layer 3 by a wet film forming method as follows.
- the target compound synthesized in Example 2 was used as the material for the light-emitting layer 4.
- the organic compound (EM-1) of the present invention and the organic iridium complex (D-1) used in Example 11 were used as a solvent.
- a composition for an organic electroluminescence device was prepared by dissolving in Lwen, and spin coating was performed using the yarn composition for the organic electroluminescence device under the following conditions.
- a uniform thin film having a thickness of 65 nm was formed by the above spin coating.
- the electroluminescence of this device was blue-green light emission with a maximum wavelength of 471 nm and a half-value width of 67 nm, and it was identified as having an organic iridium complex (D-1) power.
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Abstract
Description
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US12/095,024 US8022617B2 (en) | 2005-11-30 | 2006-11-22 | Organic compound, charge-transporting material, composition for charge-transporting material and organic electroluminescent device |
KR1020087009361A KR101395615B1 (ko) | 2005-11-30 | 2006-11-22 | 유기 화합물, 전하 수송 재료, 전하 수송 재료용 조성물 및유기 전계 발광 소자 |
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WO2008153088A1 (ja) * | 2007-06-13 | 2008-12-18 | Ube Industries, Ltd. | 有機エレクトロルミネッセンス素子及び素子用材料 |
JP2010067959A (ja) * | 2008-08-13 | 2010-03-25 | Mitsubishi Chemicals Corp | 電子デバイス、有機電界発光素子、有機el表示装置および有機el照明 |
US20110049497A1 (en) * | 2009-08-31 | 2011-03-03 | Fujifilm Corporation | Material for organic electroluminescence device and organic electroluminescence device |
WO2012105629A1 (ja) * | 2011-02-02 | 2012-08-09 | 出光興産株式会社 | 含窒素複素環誘導体、有機エレクトロルミネッセンス素子用電子輸送材料、及びそれを用いてなる有機エレクトロルミネッセンス素子 |
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US9318714B2 (en) * | 2009-08-31 | 2016-04-19 | UDC Ireland | Material for organic electroluminescence device and organic electroluminescence device |
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WO2012105629A1 (ja) * | 2011-02-02 | 2012-08-09 | 出光興産株式会社 | 含窒素複素環誘導体、有機エレクトロルミネッセンス素子用電子輸送材料、及びそれを用いてなる有機エレクトロルミネッセンス素子 |
US9748496B2 (en) | 2011-02-02 | 2017-08-29 | Idemitsu Kosan Co., Ltd. | Nitrogenated heterocyclic derivative, electron-transporting material for organic electroluminescent elements, and organic electroluminescent element using same |
Also Published As
Publication number | Publication date |
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EP1956008B1 (en) | 2012-03-28 |
KR20080074103A (ko) | 2008-08-12 |
TWI388549B (zh) | 2013-03-11 |
US20090284134A1 (en) | 2009-11-19 |
CN101287713A (zh) | 2008-10-15 |
TW200736230A (en) | 2007-10-01 |
EP1956008A1 (en) | 2008-08-13 |
US8022617B2 (en) | 2011-09-20 |
EP1956008A4 (en) | 2010-12-01 |
KR101395615B1 (ko) | 2014-05-16 |
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