WO2011068083A1 - 有機el素子および有機el素子の製造方法 - Google Patents
有機el素子および有機el素子の製造方法 Download PDFInfo
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- 0 *C(C(*)c1c2*)C(*)=C(*)c1c(*)c1c2c(*)c(c(O)cc(*)c2*)c2c1* Chemical compound *C(C(*)c1c2*)C(*)=C(*)c1c(*)c1c2c(*)c(c(O)cc(*)c2*)c2c1* 0.000 description 1
- GYUPAYHPAZQUMB-UHFFFAOYSA-N c(cc1)ccc1-c(ccc1ccc2cc3)nc1c2nc3-c1cc(-c(ccc2ccc3cc4)nc2c3nc4-c2ccccc2)ccc1 Chemical compound c(cc1)ccc1-c(ccc1ccc2cc3)nc1c2nc3-c1cc(-c(ccc2ccc3cc4)nc2c3nc4-c2ccccc2)ccc1 GYUPAYHPAZQUMB-UHFFFAOYSA-N 0.000 description 1
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
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- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/622—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing four rings, e.g. pyrene
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- C07C13/28—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof
- C07C13/32—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings
- C07C13/62—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings with more than three condensed rings
- C07C13/66—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings with more than three condensed rings the condensed ring system contains only four rings
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- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/626—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
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- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
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- C09K2211/1011—Condensed systems
Definitions
- the present invention relates to an organic EL element and a manufacturing method thereof. More specifically, the present invention relates to a technique for producing a high-performance organic EL element by defining a residual amount of a precursor compound contained in an organic compound material constituting a light emitting layer in an organic EL element.
- An organic EL device is a light emitting device with an organic light emitting material sandwiched between a cathode and an anode, and emits energy generated by recombination of electrons injected from the cathode and holes injected from the anode in the organic layer. It is a light emitting element based on the principle of taking it out as energy.
- a dry process such as a vacuum deposition method or a patterning method using a shadow mask is generally used as a method for producing an organic layer included in an organic device typified by an organic EL element.
- the vacuum deposition method has problems such as expensive manufacturing equipment and low material utilization efficiency.
- the patterning method using a shadow mask has a problem that it is difficult to manufacture a large area device.
- the above-mentioned soluble precursor is used for an organic EL device, it is possible to manufacture the device by a wet process and facilitate the creation of a large area device, but there is a possibility that an unconverted soluble precursor remains in the organic layer. There is a concern that the performance of the organic EL element is degraded.
- An object of the present invention is to suppress deterioration with time of light emission luminance of an organic EL element and prolong the life of the organic EL element in an organic EL element manufactured using a precursor compound such as a light emitting material.
- the present invention provides an organic EL device having an organic compound layer including a light emitting layer sandwiched between at least a pair of electrodes, and a naphthacene derivative represented by the following general formula (1) in the light emitting layer and a precursor thereof:
- R 1 to R 12 may be the same as or different from each other, and hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, Alkoxy group, alkylthio group, aryl ether group, aryl thioether group, aryl group, heteroaryl group, halogen, cyano group, carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group, amino group, silyl group, phosphine oxide group, and
- X is an atom or atomic group selected from C ⁇ O, CH 2 , O, and CHR 21.
- R 21 is selected from condensed rings formed between adjacent substituents. Is a substituent selected from an alkyl group, an alkenyl group, an alkoxy group, and an acyl group, and has a bond with each other to form a ring. May be.
- a decrease in the light emission luminance of the organic EL element is suppressed, and the lifetime is greatly improved.
- Sectional drawing which shows an example of the organic EL element by which the light emitting layer was patterned by this invention.
- the figure which shows an example of the shape of ITO produced on the glass substrate.
- the organic EL device of the present invention contains a naphthacene derivative in the light emitting layer and has a small content of a naphthacene precursor compound having a bicyclo structure contained in the light emitting layer.
- One preferred example of the method for producing the organic EL element of the present invention is a method using a wet process. Specifically, a naphthacene precursor compound having a bicyclo structure that can be converted into a naphthacene derivative used in the organic EL device of the present invention and is soluble is used.
- a naphthacene precursor compound having a bicyclo structure is highly soluble in many solvents, and further has a property of being converted into a naphthacene derivative by a conversion treatment such as light irradiation or heat treatment.
- a thin film of a naphthacene precursor compound having a bicyclo structure is formed by a wet process in a place where a light emitting layer is formed in an organic EL element, a light emitting layer containing a naphthacene derivative can be manufactured by performing a conversion process.
- a naphthacene precursor compound having a bicyclo structure is applied to a donor substrate, and after conversion to a naphthacene derivative, the converted naphthacene derivative is transferred to a place where a light emitting layer is formed on the device substrate.
- An organic EL element having a light-emitting layer containing a naphthacene derivative can be manufactured.
- the naphthacene precursor compound having a bicyclo structure may remain completely converted into a naphthacene derivative. It has been found that it is preferable that the content of the naphthacene precursor compound having a bicyclo structure in the light emitting layer is small in order to achieve a long lifetime of the organic EL element.
- FIG. 1 is a cross-sectional view showing an example of a typical structure of the organic EL element 10 (display).
- An active matrix circuit including the TFT 12 and the planarization layer 13 is formed on the support 11.
- the element portion is the first electrode 15 / hole transport layer 16 / light emitting layer 17 / electron transport layer 18 / second electrode 19 formed thereon.
- An insulating layer 14 that prevents a short circuit from occurring at the electrode end and defines a light emitting region is formed at the end of the first electrode.
- the configuration of the organic EL element is not limited to this example. For example, only one light emitting layer having a hole transport function and an electron transport function is formed between the first electrode and the second electrode.
- the hole transport layer may be a multilayer structure of a hole injection layer and a hole transport layer, or the electron transport layer may be a multilayer structure of an electron transport layer and an electron injection layer.
- the electron transport layer may be omitted when the light emitting layer has an electron transport function.
- these layers may be a single layer or a plurality of layers.
- a protective layer, a color filter, sealing, or the like may be performed using a known technique.
- the light emitting layer of the organic EL device of the present invention contains a naphthacene derivative represented by the following general formula (1), and further has a bicyclo structure represented by the following general formula (2), which is a precursor thereof. Precursor compounds are included.
- the content of the naphthacene precursor compound having a bicyclo structure represented by the general formula (2) contained in the light emitting layer is 5 with respect to 100 parts by weight of the naphthacene derivative represented by the general formula (1). It is important that it is not more than 0.0 parts by weight. More preferably, it is 0.001 part by weight or more and 5.0 part by weight or less.
- the naphthacene derivative represented by the general formula (1) is a compound that exhibits a function as a light emitting material, particularly a host compound.
- the naphthacene precursor compound itself having a bicyclo structure has a low function as a host compound. Therefore, the host purity in the light emitting layer of the organic EL element is improved by setting the content to 5.0 parts by weight or less with respect to 100 parts by weight of the naphthacene derivative represented by the general formula (1). Long life can be achieved.
- the host purity is improved, the probability that holes or electrons are trapped in the light emitting layer is reduced, so that the light emission efficiency is improved.
- the content of the naphthacene precursor compound having a bicyclo structure represented by the general formula (2) is 1.0 part by weight or less with respect to 100 parts by weight of the naphthacene derivative represented by the general formula (1). is there.
- the amount is 1.0 parts by weight or less, it is possible to achieve a longer lifetime of the organic EL element.
- R 1 to R 12 may be the same or different from each other, and hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl Group, alkoxy group, alkylthio group, aryl ether group, aryl thioether group, aryl group, heteroaryl group, halogen, cyano group, carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group, amino group, silyl group, phosphine oxide group As well as a condensed ring formed between adjacent substituents.
- X is an atom or atomic group selected from C ⁇ O, CH 2 , O, and CHR 21 .
- R 21 is a substituent selected from an alkyl group, an alkenyl group, an alkoxy group, and an acyl group, and may have a bond with each other to form a ring.
- the alkyl group is, for example, a saturated aliphatic hydrocarbon group such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, and tert-butyl group. This may or may not have a substituent. There are no particular limitations on the additional substituent when it is substituted, and examples thereof include an alkyl group, an aryl group, and a heteroaryl group. This point is also common to the following description.
- the number of carbon atoms of the alkyl group is not particularly limited, but is usually in the range of 1 to 20 and more preferably 1 to 8 from the viewpoint of availability and cost.
- the cycloalkyl group represents, for example, a saturated alicyclic hydrocarbon group such as a cyclopropyl group, a cyclohexyl group, a norbornyl group, and an adamantyl group, which may or may not have a substituent.
- carbon number of an alkyl group part is not specifically limited, Usually, it is the range of 3-20.
- the heterocyclic group refers to an aliphatic ring having atoms other than carbon, such as a pyran ring, a piperidine ring, and a cyclic amide, in the ring, which may or may not have a substituent. .
- carbon number of a heterocyclic group is not specifically limited, Usually, it is the range of 2-20.
- alkenyl group refers to an unsaturated aliphatic hydrocarbon group containing a double bond such as a vinyl group, an allyl group, or a butadienyl group, which may or may not have a substituent.
- carbon number of an alkenyl group is not specifically limited, Usually, it is the range of 2-20.
- the cycloalkenyl group refers to an unsaturated alicyclic hydrocarbon group containing a double bond such as a cyclopentenyl group, a cyclopentadienyl group, or a cyclohexenyl group, which may have a substituent. You don't have to. Although carbon number of a cycloalkenyl group is not specifically limited, Usually, it is the range of 2-20.
- the alkynyl group refers to, for example, an unsaturated aliphatic hydrocarbon group containing a triple bond such as an ethynyl group, which may or may not have a substituent.
- carbon number of an alkynyl group is not specifically limited, Usually, it is the range of 2-20.
- An alkoxy group refers to a functional group to which an aliphatic hydrocarbon group is bonded via an ether bond such as a methoxy group, an ethoxy group, and a propoxy group, and the aliphatic hydrocarbon group may have a substituent. It may not have. Although carbon number of an alkoxy group is not specifically limited, Usually, it is the range of 1-20.
- the alkylthio group is a group in which an oxygen atom of an ether bond of an alkoxy group is substituted with a sulfur atom.
- the hydrocarbon group of the alkylthio group may or may not have a substituent. Although carbon number of an alkylthio group is not specifically limited, Usually, it is the range of 1-20.
- An aryl ether group refers to a functional group to which an aromatic hydrocarbon group is bonded via an ether bond, such as a phenoxy group, and the aromatic hydrocarbon group may or may not have a substituent. .
- carbon number of an aryl ether group is not specifically limited, Usually, it is the range of 6-40.
- the aryl thioether group is a group in which an oxygen atom of an ether bond of an aryl ether group is substituted with a sulfur atom.
- the aromatic hydrocarbon group in the aryl thioether group may or may not have a substituent.
- the number of carbon atoms of the arylthioether group is not particularly limited, but is usually in the range of 6 or more and 40 or less.
- the aryl group is, for example, an aromatic hydrocarbon group such as a phenyl group, a naphthyl group, a biphenyl group, a fluorenyl group, a phenanthryl group, a terphenyl group, an anthracenyl group, and a pyrenyl group, or a group in which a plurality of these are connected, It can be unsubstituted or substituted.
- carbon number of an aryl group is not specifically limited, Usually, it is the range of 6-40.
- aryl groups may have are alkyl groups, cycloalkyl groups, alkenyl groups, alkynyl groups, alkoxy groups, aryl ether groups, alkylthio groups, halogens, cyano groups, amino groups (amino groups are further An aryl group or a heteroaryl group, which may be substituted), a silyl group and a boryl group.
- a heteroaryl group refers to an aromatic group having a non-carbon atom in the ring, such as a furanyl group, a thiophenyl group, an oxazolyl group, a pyridyl group, a quinolinyl group, or a carbazolyl group, which has a substituent. Even if it does not have.
- carbon number of heteroaryl group is not specifically limited, Usually, it is the range of 2-30.
- the substituent that such a heteroaryl group may have is the same as the substituent that the aryl group may have.
- Halogen is fluorine, chlorine, bromine or iodine.
- the carbonyl group refers to a substituent containing a carbon-oxygen double bond such as an acyl group or a formyl group.
- An acyl group is a substituent in which hydrogen of a formyl group is substituted with an alkyl group, an aryl group, or a heteroaryl group.
- the oxycarbonyl group is a substituent containing an ether bond on the carbon of the carbonyl group, such as t-butyloxycarbonyl group or benzyloxycarbonyl group.
- the carbamoyl group indicates a substituent from which the hydroxyl group of carbamic acid is removed, and may or may not have a substituent.
- An amino group shows nitrogen compound groups, such as a dimethylamino group, for example, and this may be unsubstituted or substituted.
- the silyl group indicates, for example, a silicon compound group such as a trimethylsilyl group, which may be unsubstituted or substituted.
- carbon number of a silyl group is not specifically limited, Usually, it is the range of 3-20.
- the number of silicon is usually 1-6.
- the phosphine oxide group refers to a substituent containing a phosphorus-oxygen double bond, which may be unsubstituted or substituted.
- the condensed ring formed between the adjacent substituents is, as explained in the general formula (1), any two adjacent substituents selected from R 1 to R 12 (for example, R 10 and R 11 ). They are bonded to each other to form a conjugated or non-serving condensed ring.
- These condensed rings may contain a nitrogen, oxygen, or sulfur atom in the ring structure, or may be further bonded to another ring.
- the naphthacene derivative represented by the general formula (1) preferably has a structure represented by the following general formula (3) because the luminous efficiency is improved.
- the naphthacene precursor compound having a bicyclo structure is more preferably a structure represented by the following general formula (4) corresponding to the naphthacene derivative represented by the general formula (3).
- R 13 to R 20 may be the same or different and are each hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group, alkoxy Group, alkylthio group, aryl ether group, aryl thioether group, aryl group, heteroaryl group, halogen, cyano group, carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group, amino group, silyl group, phosphine oxide group, and adjacent It is selected from the condensed rings formed between the substituents.
- Ar 1 and Ar 2 are selected from an aryl ether group, an aryl thioether group, an aryl group, and a heteroaryl group. Ar 1 and Ar 2 may or may not have a substituent.
- X is an atom or atomic group selected from C ⁇ O, CH 2 , O, and CHR 22 .
- R 22 is a substituent selected from an alkyl group, an alkenyl group, an alkoxy group, and an acyl group, and may have a bond with each other to form a ring.
- R 13 to R 20 and each substituent of Ar 1 and Ar 2 is the same as the description of R 1 to R 12 in the general formula (1).
- R 13 to R 20 are formed between hydrogen, an alkyl group, a heterocyclic group, an alkoxy group, an alkylthio group, an aryl ether group, an aryl thioether group, an aryl group, a heteroaryl group, and an adjacent substituent. It is preferable that the ring is selected from the condensed rings because high organic EL performance can be expressed. Among these, it is particularly preferable to select from a condensed ring formed between hydrogen, an alkyl group, a heterocyclic group, an aryl group, a heteroaryl group, and an adjacent substituent.
- Ar 1 and Ar 2 may be the same or different.
- the naphthacene precursor compound having a bicyclo structure more preferably has an ethylene cross-linked structure or a diketo cross-linked structure, and particularly preferably has a diketo cross-linked structure. That is, in the naphthacene precursor compound having a bicyclo structure represented by the general formula (1) and the general formula (3), X is preferably C ⁇ O or CH 2 , and more preferably C ⁇ O. . By setting it as the said structure, the conversion from a naphthacene precursor compound to a naphthacene derivative can be performed more efficiently.
- naphthacene derivatives represented by the above general formula (1) or general formula (3) include the following structures.
- the naphthacene derivative represented by the general formula (1) exhibits a function as a host compound as described above, a naphthacene precursor compound having a bicyclo structure can be prepared among such compounds.
- the present invention can be widely applied to. Accordingly, examples of the naphthacene derivative represented by the general formula (1) or the general formula (3) are not limited to the above, and Japanese Patent No. 4308317 (particularly 0033 to 0057), International Publication WO2007 / 097178 pamphlet (particularly 0015 to 0024). ), Naphthacene derivatives other than those mentioned in JP 3712760 (in particular, 0011 to 0039) and the like can also be preferably used.
- such naphthacene derivatives having structural isomers can be more preferably used.
- 2-substituted naphthacene, 4-substituted naphthacene, 2-substituted pentacene and the like are particularly preferable.
- the disubstituted naphthacene is preferably one in which the 5th and 12th positions of the naphthacene skeleton are substituted.
- the 4-substituted naphthacene is preferably one in which the 5th, 6th, 11th and 12th positions of the naphthacene skeleton are substituted.
- the disubstituted pentacene is preferably one in which the 6th and 13th positions of the pentacene skeleton are substituted.
- examples of the naphthacene precursor compound having a corresponding bicyclo structure include the following structures.
- Examples of the naphthacene precursor compound having a corresponding bicyclo structure include the following structures.
- Examples of the naphthacene precursor compound having a corresponding bicyclo structure include the following structures.
- naphthacene precursor compounds having a corresponding bicyclo structure can be exemplified.
- the naphthacene derivative and the naphthacene precursor compound having a bicyclo structure used in the present invention can be synthesized by a known method.
- a naphthacene derivative for example, there is a method of linking an aryl group to the 5th and 12th positions of naphthacene.
- An example is a method in which an aryl halide and 5,12-naphthacenequinone are linked using n-butyllithium and then reduced with a tin catalyst.
- a method of isolating a corresponding naphthacene derivative can be used.
- a bicyclo structure having a diketo bridge structure can be formed.
- a bicyclo structure having an ethylene cross-linked structure can be formed by a method exemplified in Journal of The American Chemical Society, 1965, Vol. 87, No. 20, pages 4649-4651.
- the naphthacene derivative used in the present invention and the naphthacene precursor compound having a bicyclo structure are preferably removed from impurities such as raw materials and by-products used in the synthesis process.
- impurities such as raw materials and by-products used in the synthesis process.
- a method for removing impurities for example, silica gel columnography, recrystallization, reprecipitation, filtration, sublimation purification, and the like can be used. Two or more of these methods may be combined.
- the organic EL device of the present invention may be manufactured by a dry process such as a vacuum vapor deposition method, or may be manufactured using a wet process. However, since it is possible to cope with the production of a large panel as compared with the conventional shadow mask deposition method, it is preferably manufactured by using a wet process. Since the naphthacene precursor compound having a bicyclo structure is soluble, the wet process can be easily applied.
- a wet process method a known method such as an inkjet method, a nozzle coating method, a spin coating method, or a dipping method can be used.
- the solubility in the present invention specifically means that 0.5 part by weight or more of a naphthacene precursor material having a bicyclo structure is dissolved in 100 parts by weight of any of the following solvents at room temperature and normal pressure.
- an organic thin film having a preferable thickness as a light emitting layer can be produced by the above-described coating method. It is more preferable to dissolve 1.0 part by weight or more.
- Solvents include toluene, xylene, chlorobenzene, chloroform, dichloromethane, dichloroethane, ethyl acetate, tetrahydrofuran, trimethylbenzene, ⁇ -butyrolactone, n-methylpyrrolidone, tetralin, o-dichlorobenzene, trichlorobenzene, ethyl benzoate, etc.
- a solvent can be used, and one having a boiling point and viscosity suitable for the coating method to be used can be selected.
- these solvents may be used alone, or a plurality of solvents may be mixed and used.
- it may dissolve by adding ultrasonic irradiation or heat treatment, and a step of filtration may be added after dissolution.
- a conversion treatment is performed in order to convert the naphthacene precursor compound having a bicyclo structure into a naphthacene derivative.
- the conversion treatment described here is a treatment for causing a structural change of a naphthacene precursor compound having a bicyclo structure by heating, light irradiation, contact with a chemical solution, or the like, and converting it to a target naphthacene derivative.
- a factor that does not remain in the constituent material of the organic EL element is preferable.
- Volatile compounds refer to acids and alkalis that do not remain after treatment, such as hydrochloric acid ether complexes and ammonia gas.
- a structural change by light irradiation and / or heat treatment is particularly preferable.
- a hot plate, an inert oven, an infrared heater, or the like can be used for heating.
- ultraviolet light In the case of converting the structure by light irradiation, it is preferable to use ultraviolet light to visible light. However, it is more preferable to use visible light because an undesired photoreaction due to ultraviolet light may occur depending on the precursor compound used.
- medical solution, etc. can be illustrated. In either case, the conversion may be promoted by heating after contact with the chemical solution. Moreover, you may introduce the process of wash
- the conversion reaction examples include Retro Diels-Alder reaction, chiral retropy reaction, decarboxylation reaction, decarbonylation reaction from carbonyl compound, deoxygenation reaction and the like.
- An optimal conversion process can be selected for each reaction. For example, in the general formula (2), when X is C ⁇ O, decarbonylation reaction by light irradiation, and when X is CH 2 , ethylene elimination reaction by heating and the like can be mentioned.
- a naphthacene having a bicyclo structure finally represented by the general formula (2) contained in the light emitting layer It is possible to control the precursor compound content to be 5.0 parts by weight or less, and further 1.0 part by weight or less with respect to 100 parts by weight of the naphthacene derivative represented by the general formula (1). is there.
- increasing the time of each treatment is generally effective for increasing the amount of conversion and reducing the amount of precursor.
- performing light irradiation while heating also has the effect of increasing the reaction rate depending on the type of conversion reaction.
- a reaction by light irradiation it is preferable to select one having a wavelength that matches the absorption of the compound, and it is more preferable to select light having a wavelength that maximizes the absorption intensity of the compound.
- the light-emitting diode can select a desired wavelength with a relatively narrow half-value width, and therefore can efficiently perform light conversion.
- a light source having a plurality of wavelengths such as a high-pressure mercury lamp
- it is desirable that light other than the desired wavelength is cut in advance through a blue filter or the like. In this case, the light intensity is weakened by passing through the filter, but sufficient conversion is possible by increasing the irradiation time.
- a specific method for producing the organic EL device of the present invention by a dry process or a wet process will be described in more detail.
- the following content is an example and the method for manufacturing the organic EL element of this invention is not restricted to these.
- a dry process such as a vacuum deposition method
- a naphthacene precursor compound having a bicyclo structure dissolved in an arbitrary solvent is subjected to a conversion treatment, and an insoluble and precipitated naphthacene derivative is recovered.
- a light emitting layer can be produced by a known method such as a vacuum deposition method.
- the precipitated naphthacene derivative may incorporate a naphthacene precursor compound having a bicyclo structure, but its weight can be sufficiently reduced if a sufficient conversion treatment is performed.
- the conversion process may be performed on a naphthacene precursor compound having a solid state bicyclo structure instead.
- a coating liquid containing at least a naphthacene derivative compound having a bicyclo structure and a solvent is applied to a device substrate on which a hole transport layer is formed and dried.
- a solvent to be used is selected so that the underlying layer does not dissolve or react.
- the naphthacene precursor compound is subjected to a conversion treatment to be converted into a naphthacene derivative, whereby an organic layer having a high function as a light emitting layer can be formed.
- a naphthacene precursor compound having a bicyclo structure is applied and converted on a substrate different from the device substrate, and the obtained film is applied to the device substrate on which the hole transport layer is formed.
- an organic layer having a high function as a light emitting layer can be formed.
- the other substrate is hereinafter referred to as “donor substrate”.
- the coating film of the naphthacene precursor compound prepared on the donor substrate is subjected to conversion treatment, and then transferred to the device substrate to produce a light-emitting layer, thereby causing uneven coating on the material before transfer on the donor substrate. Even so, unevenness is eliminated during transfer, and a uniform device constituent material layer can be formed on the device substrate.
- the device constituent material layer is a layer in which a material included in a device forms a layer, such as a light emitting layer in an organic EL element (a layer in which a light emitting material forms a layer).
- a known method can be used for the transfer step, and examples thereof include a method in which the donor substrate and the device substrate are opposed to each other and heating from the donor substrate side, and a method in which light is irradiated from the donor substrate side. If the naphthacene precursor compound having a bicyclo structure applied to the donor substrate is structurally changed by heat, if the transfer is performed by heating, the structural change also proceeds at that time, so the naphthacene precursor having the remaining bicyclo structure Body compounds can be further reduced.
- a conversion process of a naphthacene precursor compound having a bicyclo structure may be further added to the layer transferred onto the device substrate. That is, the layer transferred onto the device substrate may be further subjected to light irradiation, heating, chemical treatment, and the like. Thereby, the naphthacene precursor compound having a bicyclo structure remaining after the conversion treatment on the donor substrate and transferred onto the device substrate together with the naphthacene derivative can be further reduced. Thereby, the lifetime improvement of an organic EL element can be achieved.
- the light emitting layer may contain a known dopant material.
- a well-known thing can be used as a dopant material, For example, indenoperylene, pyromethene, those derivatives, etc. are mentioned.
- the weight concentration of the naphthacene precursor compound having a bicyclo structure relative to the naphthacene derivative in the light emitting layer is a value obtained by analysis by high performance liquid chromatography-ultraviolet absorptiometry.
- Silica gel is used as the filler, and octadecyl group-bonded silica gel, octyl group-bonded silica gel, and phenyl group-bonded silica gel are preferably used. be able to.
- As the mobile phase acetonitrile, tetrahydrofuran, distilled water, phosphoric acid aqueous solution, methanol or the like can be used, and these may be used in combination. In particular, detection can be performed with high resolution by using only acetonitrile or a mixed solvent of acetonitrile-phosphoric acid aqueous solution.
- the liquid feeding pressure of the mobile phase at this time is preferably about 35 MPa to 50 MPa.
- the production of portions other than the light emitting layer in the organic EL device of the present invention will be described.
- the following description is an example and is not restricted to these.
- the organic EL element shown in FIG. 1 up to the first electrode 15, that is, the TFT 12, the planarizing layer 13, and the first electrode 15 are patterned on the support 11 by photolithography, and then the insulating layer 14 is formed. Patterning is performed by a known technique using a photosensitive polyimide precursor material or the like. Thereafter, the hole transport layer 16 is formed on the entire surface by a known technique using a vacuum deposition method or the like. The hole transport layer 16 is used as a base layer, and the light emitting layers 17R, 17G, and 17B are patterned thereon. On top of that, if the electron transport layer 18 and the second electrode 19 are formed on the entire surface by a known technique such as a vacuum deposition method, an organic EL element can be manufactured.
- the light emitting layer may be a single layer or a plurality of layers as long as it contains the naphthacene derivative represented by the general formula (1), and may further include other materials. From the viewpoint of light emission efficiency and color purity, the light emitting layer preferably has a single layer structure of a mixture of a host material and a dopant material.
- a known method such as vapor deposition, solution coating, ink jetting, or nozzle coating can be used as a method for forming the light emitting layer.
- a film by vapor deposition it is preferable to form a film by vapor-depositing a material obtained by converting the naphthacene precursor compound having a bicyclo structure of the present invention into a naphthacene derivative. Since the naphthacene derivative obtained by converting the naphthacene precursor compound having a bicyclo structure contains a trans structure, the performance of the organic EL device is improved.
- the coating film of the naphthacene precursor compound having a bicyclo structure prepared on the donor substrate using a wet process is subjected to a conversion process, and then subjected to a transfer process onto the device substrate, and then the light emitting layer
- the method of forming is particularly preferred.
- the hole transport layer may be a single layer or a plurality of layers, and each layer may be a single material or a mixture of a plurality of materials.
- a layer called a hole injection layer is also included in the hole transport layer. From the viewpoint of hole transportability (low driving voltage) and durability, an acceptor material that promotes hole transportability may be mixed in the hole transport layer. Therefore, the transfer material for forming the hole transport layer may be made of a single material or a mixture of a plurality of materials.
- hole transport materials include N, N′-diphenyl-N, N′-dinaphthyl-1,1′-diphenyl-4,4′-diamine (NPD) and N, N′-biphenyl-N, N′—.
- aromatic amines N-isopropylcarbazole, pyrazoline derivatives, stilbene compounds, hydrazone compounds, low molecular materials such as oxadiazole derivatives and heterocyclic compounds represented by phthalocyanine derivatives, and these low molecules
- polymer materials such as polycarbonate having a compound in the side chain, styrene derivative, polyvinyl carbazole, and polysilane.
- acceptor material examples include low molecular weight materials such as 7,7,8,8-tetracyanoquinodimethane (TCNQ), hexaazatriphenylene (HAT) and its cyano group derivative (HAT-CN6).
- TCNQ 7,7,8,8-tetracyanoquinodimethane
- HAT hexaazatriphenylene
- HAT-CN6 cyano group derivative
- metal oxides such as molybdenum oxide and silicon oxide that are thinly formed on the surface of the first electrode can also be exemplified as hole transport materials and acceptor materials.
- the electron transport layer may be a single layer or a plurality of layers, and each layer may be a single material or a mixture of a plurality of materials.
- a layer called a hole blocking layer or an electron injection layer is also included in the electron transport layer.
- the electron transport layer may be mixed with a donor material that promotes electron transport properties.
- a layer called the electron injection layer is often discussed as this donor material.
- the transfer material for forming the electron transport layer may be made of a single material or a mixture of a plurality of materials.
- electron transport materials include quinolinol complexes such as Alq 3 and 8-quinolinolatolithium (Liq), condensed polycyclic aromatic derivatives such as naphthalene and anthracene, and 4,4′-bis (diphenylethenyl) biphenyl.
- quinolinol complexes such as Alq 3 and 8-quinolinolatolithium (Liq)
- condensed polycyclic aromatic derivatives such as naphthalene and anthracene
- 4,4′-bis (diphenylethenyl) biphenyl 4,4′-bis (diphenylethenyl) biphenyl.
- Styryl aromatic ring derivatives such as anthraquinone and diphenoquinone, phosphorus oxide derivatives, benzoquinolinol complexes, hydroxyazole complexes, azomethine complexes, various metal complexes such as tropolone metal complexes and flavonol metal complexes, heterogeneous containing electron-accepting nitrogen Examples thereof include low molecular materials such as compounds having an aryl ring structure, and polymer materials having these low molecular compounds in the side chain.
- the donor material examples include alkali metals and alkaline earth metals such as lithium, cesium, magnesium, and calcium, various metal complexes such as quinolinol complexes, and oxides and fluorides such as lithium fluoride and cesium oxide. be able to.
- At least one of the first electrode and the second electrode is transparent in order to extract light emitted from the light emitting layer.
- the first electrode In the case of bottom emission in which light is extracted from the first electrode, the first electrode is transparent, and in the case of top emission in which light is extracted from the second electrode, the second electrode is transparent.
- the organic EL element in the present invention is not generally limited to the active matrix type in which the second electrode is formed as a common electrode.
- the organic EL element is formed of a stripe electrode in which the first electrode and the second electrode intersect each other. It may be a simple matrix type or a segment type in which the display unit is patterned so as to display predetermined information. Examples of these applications include televisions, personal computers, monitors, watches, thermometers, audio equipment, automobile display panels, and the like.
- reaction composition organism was purified by silica gel column chromatography to obtain an intermediate 1-1 represented by the following formula.
- Dimethyl sulfoxide (1.2 mL) was dissolved in dehydrated dichloromethane (10 mL) and cooled to -78 ° C.
- Acetic anhydride (2.1 mL) was added dropwise, and the mixture was stirred at ⁇ 78 ° C. for 15 minutes.
- a dehydrated dichloromethane solution (10 mL) of Intermediate 3-2 (0.25 g)
- the mixture was stirred at ⁇ 78 ° C. for 90 minutes.
- triethylamine (2.5 mL) was added dropwise, and the mixture was further stirred at ⁇ 78 ° C. for 90 minutes, and then the reaction mixture was warmed to room temperature.
- Example 1 A donor substrate was prepared as follows. An alkali-free glass substrate was used as a support, and after cleaning / UV ozone treatment, a titanium film having a thickness of 1.0 ⁇ m was formed as a photothermal conversion layer on the entire surface by sputtering. Next, after the photothermal conversion layer has been subjected to UV ozone treatment, a positive polyimide photosensitive coating agent (DL-1000, manufactured by Toray Industries, Inc.) is spin-coated thereon, pre-baked and UV exposed, and then a developer. The exposed part was dissolved and removed by ELM-D (manufactured by Toray Industries, Inc.). The polyimide precursor film thus patterned was baked on a hot plate at 350 ° C.
- DL-1000 positive polyimide photosensitive coating agent
- the partition pattern had a height of 2 ⁇ m and a cross section of a forward tapered shape. Openings exposing the photothermal conversion layer having a width of 80 ⁇ m and a length of 280 ⁇ m were arranged in the partition pattern at a pitch of 100 and 300 ⁇ m, respectively.
- a chloroform solution containing 3% by weight of Compound [28] and 0.15% by weight of DCJTB represented by the following formula was spin-coated and dried.
- the obtained thin film was irradiated with light of a blue light-emitting diode (center wavelength: 460 nm, half-value width: 20 nm) for 3 hours in a nitrogen atmosphere to convert compound [28] into compound [1].
- a layer having an average thickness of 25 nm made of compound [1], compound [28] and DCJTB was formed in the partition pattern (opening).
- the device substrate was produced as follows. An alkali-free glass substrate (manufactured by Geomatech Co., Ltd., sputtering film-formed product) on which an ITO transparent conductive film was deposited to 140 nm was cut into 38 ⁇ 46 mm, and the ITO was etched into the shape shown in FIG. 2 by photolithography. Next, the polyimide precursor film patterned similarly to the donor substrate was baked at 300 ° C. for 10 minutes to form a polyimide-based insulating layer. The height of this insulating layer was 1.8 ⁇ m and the cross section was a forward tapered shape.
- Openings exposing ITO with a width of 70 ⁇ m and a length of 270 ⁇ m were arranged at a pitch of 100 and 300 ⁇ m inside the pattern of the insulating layer.
- This substrate was subjected to UV ozone treatment, installed in a vacuum deposition apparatus, and evacuated until the degree of vacuum in the apparatus became 3 ⁇ 10 ⁇ 4 Pa or less.
- 20 nm of copper phthalocyanine (CuPc) and 40 nm of NPD were stacked as a hole transport layer by vapor deposition over the entire light emitting region.
- the partition pattern of the donor substrate and the insulating layer of the device substrate were aligned and held in a vacuum of 3 ⁇ 10 ⁇ 4 Pa or less, and then taken out into the atmosphere.
- the transfer space partitioned by the insulating layer and the partition pattern was kept in a vacuum.
- an irradiation shape is formed into a rectangle of 340 ⁇ m wide and 50 ⁇ m long at a center wavelength of 940 nm from the glass substrate side of the donor substrate so that a part of the material in the partition pattern and a part of the partition pattern are heated simultaneously.
- the material in the partition pattern was transferred onto the hole transport layer which is the underlayer of the device substrate.
- the laser intensity was 148 W / mm 2
- the scan speed was 0.6 m / s
- the scan was repeated 24 times in such a manner that the lasers were overlapped so as to be transferred to the entire light emitting region.
- the transferred device substrate was placed in the vacuum deposition apparatus again and evacuated until the degree of vacuum in the apparatus became 3 ⁇ 10 ⁇ 4 Pa or less.
- E-1 shown below as an electron transporting layer was deposited on the entire surface of the light emitting region by resistance heating.
- lithium fluoride was deposited at a thickness of 0.5 nm as a donor material (electron injection layer), and aluminum was deposited at a thickness of 100 nm as a second electrode to produce an organic EL device having a 5 mm square light emitting region.
- the content of the compound [28] was measured by HPLC, it was 2.0 parts by weight with respect to 100 parts by weight of the compound [1].
- Example 2 An organic EL device was produced in the same manner as in Example 1 except that the compound [34] represented by the following formula was used instead of DCJTB. The content of the compound [28] in the organic EL device produced at this time was 1.8 parts by weight with respect to 100 parts by weight of the compound [1].
- Example 3 An organic EL device was produced in the same manner as in Example 1 except that the light irradiation time with the blue light emitting diode was set to 10 hours. The content of the compound [28] in the organic EL device produced at this time was 0.3 parts by weight with respect to 100 parts by weight of the compound [1].
- Example 4 An organic EL device was produced in the same manner as in Example 1 except that the compound [30] was used instead of the compound [28].
- compound [30] When compound [30] is irradiated with light from a blue light-emitting diode (center wavelength: 460 nm, half-value width: 20 nm) for 3 hours, it is converted to compound [2].
- the content of the compound [30] in the organic EL device produced at this time was 3.1 parts by weight with respect to 100 parts by weight of the compound [2].
- Example 5 An organic EL device was produced in the same manner as in Example 1 except that the compound [32] was used instead of the compound [28]. When compound [32] is irradiated with light from a blue light-emitting diode (center wavelength: 460 nm, half width: 20 nm) for 3 hours, it is converted to compound [3]. Content of compound [32] in the organic EL element produced at this time was 1.5 parts by weight with respect to 100 parts by weight of compound [3].
- Example 6 After the transfer step, an organic EL device was produced in the same manner as in Example 3 except that the device substrate onto which the light emitting layer was transferred was irradiated with light from a blue light emitting diode for 1 hour under vacuum. Content of compound [28] in the organic EL element produced at this time was 0.1 part by weight with respect to 100 parts by weight of compound [1].
- Example 7 An organic EL device was produced in the same manner as in Example 1 except that the light irradiation time by the blue light emitting diode was set to 4 hours. Content of compound [28] in the organic EL element produced at this time was 1.2 parts by weight with respect to 100 parts by weight of compound [1].
- Example 8 An organic EL device was produced in the same manner as in Example 1 except that the light irradiation time by the blue light emitting diode was 2.5 hours. The content of the compound [28] in the organic EL device produced at this time was 2.6 parts by weight with respect to 100 parts by weight of the compound [1].
- Example 9 An organic EL device was produced in the same manner as in Example 1 except that the light irradiation time by the blue light emitting diode was set to 2 hours. The content of the compound [28] in the organic EL device produced at this time was 4.2 parts by weight with respect to 100 parts by weight of the compound [1].
- Example 10 An organic EL device was produced in the same manner as in Example 1 except that the light irradiation time by the blue light emitting diode was 1.7 hours. The content of the compound [28] in the organic EL device produced at this time was 4.8 parts by weight with respect to 100 parts by weight of the compound [1].
- Comparative Example 1 An organic EL device was produced in the same manner as in Example 1 except that the light irradiation time by the blue light emitting diode was set to 1 hour. Content of compound [28] in the organic EL element produced at this time was 6.3 parts by weight with respect to 100 parts by weight of compound [1].
- Comparative Example 2 An organic EL device was produced in the same manner as in Example 1 except that the light irradiation time by the blue light emitting diode was 1.5 hours. The content of the compound [28] in the organic EL device produced at this time was 5.3 parts by weight with respect to 100 parts by weight of the compound [1].
- Comparative Example 3 Except for using light (peak wavelength 405 nm (half width 5 nm), 436 nm (half width 5 nm)) of a high-pressure mercury lamp (600 W) that passed through a blue filter instead of a blue light emitting diode (center wavelength 460 nm, half width 20 nm)
- An organic EL element was produced in the same manner as in Example 1.
- the content of the compound [28] in the organic EL device produced at this time was 6.0 parts by weight with respect to 100 parts by weight of the compound [1].
- Example 11 An organic EL device was produced in the same manner as in Comparative Example 3 except that the light irradiation time with a high-pressure mercury lamp through a blue filter was set to 7 hours.
- the content of the compound [28] in the organic EL device produced at this time was 4.0 parts by weight with respect to 100 parts by weight of the compound [1].
- Example 12 An organic EL device was produced in the same manner as in Example [1] except that Compound [32] was used instead of Compound [28] and Compound [34] was used instead of DCJTB.
- the content of the compound [32] in the organic EL device produced at this time was 1.5 parts by weight with respect to 100 parts by weight of the compound [3].
- Example 13 An organic EL device was produced in the same manner as in Example 11 except that the light irradiation time with the blue light emitting diode was set to 10 hours. The content of the compound [32] in the organic EL device produced at this time was 0.1 part by weight with respect to 100 parts by weight of the compound [3].
- Example 14 An organic EL device was produced in the same manner as in Example 11 except that the light irradiation time with the blue light emitting diode was set to 8 hours.
- the content of the compound [32] in the produced organic EL device was 0.3 part by weight with respect to 100 parts by weight of the compound [3].
- Example 15 An organic EL device was produced in the same manner as in Example 11 except that the light irradiation time with the blue light emitting diode was set to 5 hours. The content of the compound [32] in the organic EL device produced at this time was 0.6 parts by weight with respect to 100 parts by weight of the compound [3].
- Example 16 An organic EL device was produced in the same manner as in Example 11 except that the light irradiation time with the blue light emitting diode was set to 2 hours. The content of the compound [32] in the organic EL device produced at this time was 2.3 parts by weight with respect to 100 parts by weight of the compound [3].
- Example 17 An organic EL device was produced in the same manner as in Example 11 except that the light irradiation time by the blue light emitting diode was set to 1 hour.
- the content of the compound [32] in the produced organic EL device was 3.3 parts by weight with respect to 100 parts by weight of the compound [3].
- Example 18 An organic EL device was produced in the same manner as in Example 11 except that the light irradiation time by the blue light emitting diode was 30 minutes. The content of the compound [32] in the organic EL device produced at this time was 4.6 parts by weight with respect to 100 parts by weight of the compound [3].
- Comparative Example 4 An organic EL device was produced in the same manner as in Example 11 except that the light irradiation time by the blue light emitting diode was set to 20 minutes.
- the content of the compound [32] in the produced organic EL device was 6.0 parts by weight with respect to 100 parts by weight of the compound [3].
- Comparative Example 5 An organic EL device was produced in the same manner as in Example 11 except that the light irradiation time by the blue light emitting diode was set to 10 minutes. The content of the compound [32] in the produced organic EL device was 12 parts by weight with respect to 100 parts by weight of the compound [3].
- Organic EL elements (device substrates) 11 Support 12 TFT (including extraction electrode) 13 planarization layer 14 insulating layer 15 first electrode 16 hole transport layer 17 light emitting layer 18 electron transport layer 19 second electrode 20 glass substrate 21 ITO pattern
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Abstract
Description
ハロゲンとはフッ素、塩素、臭素、ヨウ素である。
ドナー材料としては、リチウムやセシウム、マグネシウム、カルシウムなどのアルカリ金属やアルカリ土類金属、それらのキノリノール錯体などの各種金属錯体、フッ化リチウムや酸化セシウムなどのそれらの酸化物やフッ化物を例示することができる。
合成例1(化合物[1]の合成)
フェナンシルブロマイド(Aldrich社製)(9.5g)、フェノール((株)和光純薬工業社製)(6.8g)、炭酸カリウム((株)和光純薬工業社製)(13.3g)をアセトン(192mL)に溶解し、窒素気流下、加熱還流させながら3時間撹拌した。室温に冷却した後、水200mLを加え、ジクロロメタンで抽出した。有機層を水で2回洗浄し、硫酸マグネシウムで乾燥後、ロータリーエバポレーターで溶媒を留去した。得られた反応組成生物をシリカゲルカラムクロマトグラフィーにより精製し、下記式に示す中間体1-1を得た。
1H-NMR(CDCl3(d=ppm)):7.06-8.29(m,26H),8.50(s,2H)。
化合物[1](1.0g)と炭酸ビニレン((株)東京化成工業社製)(2.5mL)をオルトジクロロベンゼン((株)和光純薬工業社製)(16mL)中10時間加熱還流した。室温まで反応液を冷却後、ヘキサン(30mL)を加えて撹拌した。得られた溶液をカラムクロマトグラフィー(充填材:シリカゲル、溶離液:ヘキサン/ジクロロメタン)で精製し、下記式に示す中間体2-1を0.89g得た。
1H-NMR(CDCl3(d=ppm)):5.02(s,2H),7.00-8.00(m,26H)。
化合物[2](0.48g)と炭酸ビニレン(0.1mL)をオルトジクロロベンゼン(10mL)中15時間加熱還流した。室温まで反応液を冷却後、大過剰のヘキサンを加えて激しく撹拌した。生じた粉末固体をろ過して乾燥することで下記式に示す中間体3-1を0.53g得た。
1H-NMR(CDCl3(d=ppm)):4.94(s,2H),6.95-7.87(m,34H)。
フェニルアセチレン((株)東京化成工業社製)(10g)を脱水テトラヒドロフラン(200mL)に溶解し、0℃に冷却後、n-ブチルリチウム溶液(1.6Mヘキサン溶液、62mL)を滴下し、1.5時間撹拌した。ここにフェニルアセトアルデヒド(Alfa Aser社製)(6.0g)とテトラヒドロフラン(20mL)の混合溶液を滴下し、室温まで昇温し、6時間撹拌した。反応液に蒸留水(100mL)と酢酸エチル(150mL)を加えて撹拌した。有機層を分取して飽和食塩水で洗浄し、硫酸ナトリウムで乾燥した。得られた溶液をカラムクロマトグラフィー(充填材:シリカゲル、溶離液:ヘキサン/酢酸エチル)で精製し、下記式に示す中間体4-1を8.5g得た。
1H-NMR(CDCl3(d=ppm)):6.70-7.74(m,26H),8.04-9.09(t,4H),8.19(s,2H)。
化合物[3](0.773g)と炭酸ビニレン(1.73mL)をオルトジクロロベンゼン(11mL)中13時間加熱還流した。室温まで反応液を冷却後、ヘキサン(30mL)を加えて撹拌した。得られた溶液をカラムクロマトグラフィー(充填材:シリカゲル、溶離液:ヘキサン/ジクロロメタン)で精製し、下記式に示す中間体5-1を0.92g得た。
1H-NMR(CDCl3(d=ppm)):5.15(s,2H),6.93-7.68(m,30H)。
ドナー基板を以下のとおり作製した。支持体として無アルカリガラス基板を用い、洗浄/UVオゾン処理後に、光熱変換層として厚さ1.0μmのチタン膜をスパッタリング法により全面形成した。次に、前記光熱変換層をUVオゾン処理した後に、上にポジ型ポリイミド系感光性コーティング剤(東レ株式会社製、DL-1000)をスピンコート塗布し、プリベーキング、UV露光した後に、現像液(東レ株式会社製、ELM-D)により露光部を溶解・除去した。このようにパターニングしたポリイミド前駆体膜をホットプレートで350℃、10分間ベーキングして、ポリイミド系の区画パターンを形成した。この区画パターンの高さは2μmで、断面は順テーパー形状であった。区画パターン内部には幅80μm、長さ280μmの光熱変換層を露出する開口部が、それぞれ100、300μmのピッチで配置されていた。この基板上に、化合物[28]を3重量%、下記式で表されるDCJTBを0.15重量%含むクロロホルム溶液をスピンコート塗布・乾燥した。得られた薄膜に窒素雰囲気下、青色発光ダイオード(中心波長:460nm、半値幅:20nm)の光を3時間照射し、化合物[28]を化合物[1]へと変換した。この結果、区画パターン内(開口部)に化合物[1]と化合物[28]およびDCJTBからなる平均厚さ25nmの層を形成した。
DCJTBの代わりに下記式に示す化合物[34]を用いた以外は、実施例1と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[28]の含有量は化合物[1] 100重量部に対して1.8重量部であった。
青色発光ダイオードによる光照射時間を10時間とした以外は実施例1と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[28]の含有量は化合物[1] 100重量部に対して0.3重量部であった。
化合物[28]の代わりに化合物[30]を用いた以外は実施例1と同様にして有機EL素子を作製した。化合物[30]に青色発光ダイオード(中心波長:460nm、半値幅:20nm)の光を3時間照射すると化合物[2]に変換される。このとき作製した有機EL素子中の化合物[30]の含有量は化合物[2] 100重量部に対して3.1重量部であった。
化合物[28]の代わりに化合物[32]を用いた以外は実施例1と同様にして有機EL素子を作製した。化合物[32]に青色発光ダイオード(中心波長:460nm、半値幅:20nm)の光を3時間照射すると化合物[3]に変換される。このとき作製した有機EL素子中の化合物[32]の含有量は化合物[3] 100重量部に対して1.5重量部であった。
転写工程の後に、発光層が転写されたデバイス基板に真空下において青色発光ダイオードによる光照射を1時間加えた以外は実施例3と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[28]の含有量は化合物[1] 100重量部に対して0.1重量部であった。
青色発光ダイオードによる光照射時間を4時間とした以外は実施例1と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[28]の含有量は化合物[1] 100重量部に対して1.2重量部であった。
青色発光ダイオードによる光照射時間を2.5時間とした以外は実施例1と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[28]の含有量は化合物[1] 100重量部に対して2.6重量部であった。
青色発光ダイオードによる光照射時間を2時間とした以外は実施例1と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[28]の含有量は化合物[1] 100重量部に対して4.2重量部であった。
青色発光ダイオードによる光照射時間を1.7時間とした以外は実施例1と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[28]の含有量は化合物[1]100重量部に対して4.8重量部であった。
青色発光ダイオードによる光照射時間を1時間とした以外は実施例1と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[28]の含有量は化合物[1] 100重量部に対して6.3重量部であった。
青色発光ダイオードによる光照射時間を1.5時間とした以外は実施例1と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[28]の含有量は化合物[1] 100重量部に対して5.3重量部であった。
青色発光ダイオード(中心波長460nm、半値幅20nm)の代わりにブルーフィルタを通した高圧水銀ランプ(600W)の光(ピーク波長405nm(半値幅5nm)、436nm(半値幅5nm))を用いた以外は実施例1と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[28]の含有量は化合物[1]100重量部に対して6.0重量部であった。
実施例11
ブルーフィルタを通した高圧水銀ランプによる光照射時間を7時間とした以外は比較例3と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[28]の含有量は化合物[1]100重量部に対して4.0重量部であった。
化合物[28]の代わりに化合物[32]を、DCJTBの代わりに化合物[34]を用いた以外は実施例[1]と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[32]の含有量は化合物[3]100重量部に対して1.5重量部であった。
青色発光ダイオードによる光照射時間を10時間とした以外は実施例11と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[32]の含有量は化合物[3]100重量部に対して0.1重量部であった。
青色発光ダイオードによる光照射時間を8時間とした以外は実施例11と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[32]の含有量は化合物[3]100重量部に対して0.3重量部であった。
青色発光ダイオードによる光照射時間を5時間とした以外は実施例11と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[32]の含有量は化合物[3]100重量部に対して0.6重量部であった。
青色発光ダイオードによる光照射時間を2時間とした以外は実施例11と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[32]の含有量は化合物[3]100重量部に対して2.3重量部であった。
青色発光ダイオードによる光照射時間を1時間とした以外は実施例11と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[32]の含有量は化合物[3]100重量部に対して3.3重量部であった。
青色発光ダイオードによる光照射時間を30分とした以外は実施例11と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[32]の含有量は化合物[3]100重量部に対して4.6重量部であった。
青色発光ダイオードによる光照射時間を20分とした以外は実施例11と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[32]の含有量は化合物[3]100重量部に対して6.0重量部であった。
青色発光ダイオードによる光照射時間を10分とした以外は実施例11と同様にして有機EL素子を作製した。このとき作製した有機EL素子中の化合物[32]の含有量は化合物[3]100重量部に対して12重量部であった。
11 支持体
12 TFT(取り出し電極含む)
13 平坦化層
14 絶縁層
15 第一電極
16 正孔輸送層
17 発光層
18 電子輸送層
19 第二電極
20 ガラス基板
21 ITOパターン
Claims (13)
- 少なくとも一対の電極間に挟持された発光層を含む有機化合物層を有する有機EL素子において、前記発光層中に下記一般式(1)で表されるナフタセン誘導体を含有し、さらに前記発光層中に存在する下記一般式(2)で表されるナフタセン前駆体化合物の含有量が、一般式(1)で表されるナフタセン誘導体100重量部に対して5.0重量部以下である有機EL素子。
- 前記発光層中に存在する前記一般式(2)で表されるナフタセン前駆体化合物の含有量が、前記一般式(1)で表されるナフタセン誘導体100重量部に対して1.0重量部以下である請求項1記載の有機EL素子。
- 前記発光層中に存在する前記一般式(2)で表されるナフタセン前駆体化合物の含有量が、前記一般式(1)で表されるナフタセン誘導体100重量部に対して0.001重量部以上である請求項1または2記載の有機EL素子。
- 前記ナフタセン誘導体が下記一般式(3)で表され、かつ前記ビシクロ構造を有するナフタセン前駆体化合物が下記一般式(4)で表される請求項1~3のいずれか記載の有機EL素子。
- 前記一般式(2)で表されるナフタセン前駆体化合物において、XがC=OまたはCH2である請求項1~4のいずれか記載の有機EL素子。
- 下記一般式(2)で表されるナフタセン前駆体化合物を変換処理により下記一般式(1)で表されるナフタセン誘導体に変換し、前記変換処理を施した材料を有する層を有機EL素子の発光層とする有機EL素子の製造方法であって、発光層中に存在する一般式(2)で表されるナフタセン前駆体化合物の含有量が、一般式(1)で表されるナフタセン誘導体100重量部に対して5.0重量部以下である有機EL素子の製造方法。
- 前記発光層中に存在する前記一般式(2)で表されるナフタセン前駆体化合物の含有量が、前記一般式(1)で表されるナフタセン誘導体100重量部に対して1.0重量部以下である請求項6記載の有機EL素子の製造方法。
- 前記発光層中に存在する前記一般式(2)で表されるナフタセン前駆体化合物の含有量が、前記一般式(1)で表されるナフタセン誘導体100重量部に対して0.001重量部以上である請求項6または7記載の有機EL素子の製造方法。
- 少なくとも前記一般式(2)で表されるナフタセン前駆体化合物を含有する層をドナー基板上に形成する工程と、前記ドナー基板上の前記一般式(2)で表されるナフタセン前駆体化合物を変換処理により前記一般式(1)で表されるナフタセン誘導体に変換する工程と、前記ドナー基板上の層を有機EL素子のデバイス基板に転写して発光層とする工程を含むことを特徴とする請求項6~8のいずれか記載の有機EL素子の製造方法。
- 前記一般式(2)で表されるナフタセン前駆体化合物を含有する層を前記ドナー基板上に形成する方法がウェットプロセスによるものである請求項9記載の有機EL素子の製造方法。
- 前記転写工程の後にさらに変換処理を施す請求項9または10記載の有機EL素子の製造方法。
- 少なくとも前記一般式(2)で表されるナフタセン前駆体化合物を含有する層を、少なくとも陽極と正孔輸送層を有する基板上に形成する工程と、前記一般式(2)で表されるナフタセン前駆体化合物を変換処理により前記一般式(1)で表されるナフタセン誘導体に変換し、発光層とする工程を含む請求項6~8のいずれか記載の有機EL素子の製造方法。
- 前記変換処理が光照射および/または熱処理である請求項6~12のいずれか記載の有機EL素子の製造方法。
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WO2013146631A1 (ja) * | 2012-03-28 | 2013-10-03 | 東レ株式会社 | 有機デバイス材料前駆体およびその製造方法ならびにこれを用いた発光素子およびその製造方法 |
WO2013146630A1 (ja) * | 2012-03-28 | 2013-10-03 | 東レ株式会社 | 有機デバイス材料前駆体およびその製造方法ならびにこれを用いた発光素子およびその製造方法 |
WO2020039708A1 (ja) | 2018-08-23 | 2020-02-27 | 国立大学法人九州大学 | 有機エレクトロルミネッセンス素子 |
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