US20150084016A1 - Organic electroluminescent element, light-emitting material therefor, light emitting device, display device, and illumination device - Google Patents
Organic electroluminescent element, light-emitting material therefor, light emitting device, display device, and illumination device Download PDFInfo
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- US20150084016A1 US20150084016A1 US14/349,938 US201214349938A US2015084016A1 US 20150084016 A1 US20150084016 A1 US 20150084016A1 US 201214349938 A US201214349938 A US 201214349938A US 2015084016 A1 US2015084016 A1 US 2015084016A1
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- United States
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- carbon atoms
- light emitting
- general formula
- organic electroluminescent
- Prior art date
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/624—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing six or more rings
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- H01L51/0056—
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B3/00—Dyes with an anthracene nucleus condensed with one or more carbocyclic rings
- C09B3/78—Other dyes in which the anthracene nucleus is condensed with one or more carbocyclic rings
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B57/00—Other synthetic dyes of known constitution
- C09B57/001—Pyrene dyes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B57/00—Other synthetic dyes of known constitution
- C09B57/008—Triarylamine dyes containing no other chromophores
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- C—CHEMISTRY; METALLURGY
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Definitions
- the present invention relates to an organic electroluminescent element and a light emitting material for an organic electroluminescent element for use in the element.
- the present invention further relates to a light emitting device, a display device, or an illumination device each using the organic electroluminescent element.
- organic electroluminescent elements (which may hereinafter also be referred to as “elements” or “organic EL elements”) are capable of high-luminance light emitting with driving at a low voltage, they have been actively researched and developed.
- the organic electroluminescent elements have organic layers between a pair of electrodes, and utilize, for light emitting, energy of the exciton generated as a result of recombination of electrons injected from a cathode and holes injected from an anode in the organic layer. Since the organic electroluminescent elements are capable of being provided as an element having various light emitting wavelengths, have a high response speed, and are relatively thin and light-weight, it is expected that the element can be employed in a wide range of applications. Above all, it is important to develop an organic electroluminescent element having high blue color purity and luminous efficiency in applications with full-color displays, and the like, and the outcomes of various research and development studies up to now have been reported.
- PTL 1 describes a blue fluorescent light emitting material having a diaminopyrene skeleton containing two substituted or unsubstituted amino groups, and also describes that an organic electroluminescent device having excellent blue color purity and luminous efficiency can be provided.
- a compound having an extended ⁇ conjugation system of a pyrene skeleton has substantially not been investigated in the prior art and PTL 1 has neither disclosure nor suggestion of extension of the ⁇ conjugation system of a pyrene skeleton.
- PTL 2 discloses an organic electroluminescent element having a strong luminous intensity and high durability, using a material having two fused rings formed in a tetracene skeleton, and the literature describes a dibenzopyrene skeleton as an example of the skeleton.
- the same literature does not substantially mention a dibenzopyrene skeleton, and has neither disclosure nor suggestion of specific exemplary compounds having dibenzopyrene skeletons.
- PTL 3 describes the use of a compound of a dibenzopyrene skeleton (liquid crystal material) as a host material in a light emitting layer of a phosphorescent organic electroluminescent element, and further describes that an organic electroluminescent element having high luminance and high efficiency is obtained.
- the same literature only describes the use of the compound as a host material of alight emitting layer, and has neither disclosure nor suggestion of the use of a compound having a dibenzopyrene skeleton as a light emitting material in a light emitting layer.
- compounds having dibenzopyrene skeletons are used in other fields, and for example, PTL 4 describes an organic transistor including a compound having a dibenzopyrene skeleton (dibenzotetracene skeleton).
- dibenzotetracene skeleton dibenzotetracene skeleton
- the same literature does not mention the presence or absence of luminous function, the luminous intensity, or the chromaticity when a compound having a dibenzopyrene skeleton is used in an organic electroluminescent element.
- the blue fluorescent light emitting material having a diaminopyrene skeleton described in PTL 1 has a peak wavelength for light emission on the long wave side and is not satisfactory in the blue color purity.
- an unsubstituted dibenzopyrene is described as an exemplary compound in PTL 2, it could also be seen that the compound has strong association, leading to associative light emission and thus poor chromaticity, and therefore, it is inappropriate as a light emitting material.
- the compound having a dibenzopyrene skeleton (liquid crystal material) described in PTL 3 has poor heat resistance as the compound, and when the compound is used as a light emitting material of an organic electroluminescent element, it has low luminous efficiency.
- the present invention aims to solve the foregoing problems. It is an object of the present invention to provide a light emitting material for an organic electroluminescent element, having high heat resistance and excellent chromaticity, and an organic electroluminescent element having high luminous efficiency and excellent chromaticity, using the light emitting material.
- the present inventors have conducted intensive investigations for the purpose of providing a light emitting material for an organic electroluminescent element, having high heat resistance and excellent chromaticity, and an organic electroluminescent element having high luminous efficiency and excellent chromaticity, using the light emitting material. As a result, they have found that the above-described problems can be solved by using a compound having a specific structure, thereby providing the present invention as described below.
- An organic electroluminescent element including a substrate, a pair of electrodes including an anode and a cathode, disposed on the substrate, and at least one organic layer including a light emitting layer, disposed between the electrodes,
- the light emitting layer contains a luminescent compound represented by the following general formula (1).
- R 1 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- 8 to 13 groups out of R 1 to R 14 each represent a hydrogen atom or a deuterium atom.
- At least one of R 1 to R 14 in the general formula (1) is preferably an electron donating substituent.
- At least one of R 1 to R 14 in the general formula (1) is preferably an amino group.
- the luminescent compound represented by the general formula (1) is preferably a luminescent compound represented by the following general formula (2).
- R 2 to R 24 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- R 15 and R 16 each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and may be bonded to each other to form a ring or may be bonded to R 2 or R 14 to form a ring.
- the luminescent compound represented by the general formula (1) is preferably a luminescent compound represented by the following general formula (3).
- R 1 and R 4 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- R 31 to R 33 each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and R 32 and R 33 may be bonded to each other to form a ring.
- the luminescent compound represented by the general formula (1) is preferably a luminescent compound represented by the following general formula (4).
- R 1 , R 4 to R 8 and R 11 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- R 31 to R 36 each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom
- R 32 and R 33 may be bonded to each other to form a ring
- R 35 and R 36 may be bonded to each other to form a ring.
- the luminescent compound represented by the general formula (1) is preferably a luminescent compound represented by the following general formula (5).
- R 2 to R 7 and R 9 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- R 17 to R 20 each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and R 17 and R 19 may be bonded to any of R 2 , R 14 , or R 18 and any of R 7 , R 9 , or R 20 , respectively, to form a ring.
- the luminescent compound represented by the general formula (1) is preferably a luminescent compound represented by the following general formula (6).
- R 2 to R 9 and R 11 to R 24 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- R 21 to R 24 each independently represent alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and R 21 and R 23 may be bonded to any of R 2 , R 14 , or R 22 and any of R 9 , R 11 , or R 24 , respectively, to form a ring.
- the luminescent compound represented by the general formula (1) is preferably a luminescent compound represented by the following general formula (7).
- R 2 and R 4 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- R 25 to R 28 each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and R 25 and R 27 may be bonded to any of R 2 , R 14 , or R 26 and any of R 2 , R 4 , or R 28 , respectively, to form a ring.
- the light emitting layer preferably contains an anthracene-based host material.
- the light emitting layer is preferably formed by a vacuum deposition process.
- the light emitting layer is preferably formed by a wet process.
- a light emitting material for an organic electroluminescent element represented by the following general formula (1).
- R 1 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- 8 to 13 groups out of R 1 to R 14 each represent a hydrogen atom or a deuterium atom.
- the organic electroluminescent element of the present invention has high luminous efficiency and excellent chromaticity. Further, the light emitting material for an organic electroluminescent element of the present invention has high heat resistance and excellent chromaticity, and accordingly, such an excellent organic electroluminescent element can be easily prepared. Further, the light emitting device, the display device, and the illumination device of the present invention have advantageous effects in that the power consumption is low and the blue color purity is excellent.
- FIG. 1 is a schematic view showing one example of a configuration of an organic electroluminescent element according to the present invention.
- FIG. 2 is a schematic view showing one example of alight emitting device according to the present invention.
- FIG. 3 is a schematic view showing one example of an illumination device according to the present invention.
- the numerical value range expressed with “to” means a range including the numerical values before and after “to” as the lower limit and the upper limit, respectively.
- the light emitting material for an organic electroluminescent element of the present invention may be represented by the following general formula (1).
- the organic electroluminescent element of the present invention includes a substrate, a pair of electrodes including an anode and a cathode, disposed on the substrate, and at least one organic layer including a light emitting layer, disposed between the electrodes, in which the light emitting layer contains a luminescent compound represented by the following general formula (1).
- R 1 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- 8 to 13 groups out of R 1 to R 14 each represent a hydrogen atom or a deuterium atom.
- the organic electroluminescent element of the present invention may contain the light emitting material for an organic electroluminescent element of the present invention, which may be represented by the general formula (1), as a luminescent compound in the light emitting layer.
- the hydrogen atom which is used without particular distinction at each occurrence in the description of the respective general formulae also includes isotopes (a deuterium atom and the like), and the atoms additionally constituting the substituent are also intended to include isotopes of the atoms.
- the “substituent” at each occurrence may be further substituted with a substituent.
- the “alkyl group” at each occurrence in the present invention includes an alkyl group substituted with a fluorine atom (for example, a trifluoromethyl group), an alkyl group substituted with an aryl group (for example, a triphenylmethyl group), and the like, but “an alkyl group having 1 to 6 carbon atoms” represents one having 1 to 6 carbon atoms, as any group also including substituted groups thereof.
- the organic electroluminescent element of the present invention is excellent in terms of luminous efficiency and color purity when the light emitting layer contains the luminescent compound represented by the general formula (1).
- the organic electroluminescent element of the present invention can have good blue color purity, as compared with the diaminopyrene compound described in JP-A-2004-204238, by shortening the light emitting wavelength.
- the luminescent compound represented by the general formula (1) has a skeleton having an extended benzo-fused ring with respect to a pyrene skeleton, and thus despite its extended conjugation ⁇ plane, it is an unexpected effect that the light emitting wavelength is shortened and the blue color purity is improved.
- the present invention has the inventive step with respect to JP-A-2004-204238.
- the reason therefor is thought to be that the fused ring structure is extended in the direction perpendicular to a transition bipolar moment with respect to the pyrene skeleton and the donating property of an amino group is reduced by twisting a substituent on the amino group.
- the reason why the luminous spectrum is sharpened and the blue color purity is thus improved in the luminescent compound represented by the general formula (1) is not clear, but it is presumed to be that the change in the structures is small in the case of transition from a ground state to an excited state in a central skeleton, and when an electron donating group is used as a substituent, the central skeleton serves as an electron receiving group, thereby forming a donor and acceptor structure, and accordingly, the change in the structures in the excited state becomes smaller.
- R 1 to R 14 groups out of R 1 to R 14 each represent a hydrogen atom or a deuterium atom.
- the hydrogen atom in R 1 to R 14 is at least the lower limit of the range, the heat resistance of the luminescent compound represented by the general formula (1) is improved, and thus, the luminous efficiency of the element in the case of using the compound as a light emitting material in the light emitting layer of the organic electroluminescent element is increased.
- the compound 35 used in Examples of JP-A-2005-82702 (corresponding to a compound having 6 hydrogen atoms in R 1 to R 14 in the general formula (1)) exhibits a liquid crystal property, and accordingly, it has a lowered melting point and the molecular motion increases, and thus, the thermal decomposition temperature becomes lowered.
- the number of hydrogen atoms in R 1 to R 14 in the general formula (1) is no more than the above range, the chromaticity of the luminescent compound represented by the general formula (1) is improved, and thus, when the compound is used as a light emitting material in the light emitting layer of the organic electroluminescent element, the chromaticity of the element is increased.
- the association among the dibenzopyrene rings is inhibited by incorporating a specific substituent and the excimer light emission is thus inhibited, thereby obtaining these effects.
- 10 to 12 groups of R 1 to R 14 each represent a hydrogen atom or a deuterium atom, and it is more preferable that 10 groups of R 1 to R 14 each represent a hydrogen atom or a deuterium atom. Further, in the case where R 1 to R 14 each represent a hydrogen atom or a deuterium atom, a hydrogen atom is preferable to a deuterium atom.
- R 1 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- each substituent other than the hydrogen atom and the deuterium atom represented by R 1 to R 14 be specifically the following Substituent Group a.
- An alkyl group (preferably having 1 to 30 carbon atoms, more preferably having 1 to 20 carbon atoms, and particularly preferably having 1 to 10 carbon atoms; for example, methyl, ethyl, isopropyl, t-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, and cyclohexyl), an aryl group (preferably having 6 to 30 carbon atoms, more preferably having 6 to 20 carbon atoms, and particularly preferably having 6 to 12 carbon atoms; for example, phenyl, p-methylphenyl, naphthyl, and anthranyl), an amino group (the amino group may have a substituent, and the total number of carbon atoms of the amino group including the substituent is preferably from 0 to 30, more preferably from 0 to 20, and particularly preferably from 0 to 10; the amino group is, for example, amino,
- substituents may be further substituted, and examples of the additional substituent include the groups selected from the Substituent Group A as described below. Further, the substituent substituted with a substituent may be further substituted, and examples of the additional substituent include the groups selected from the Substituent Group A as described below. In addition, the substituent substituted with the substituent which has been substituted with a substituent may be further substituted, and examples of the additional substituent include the groups selected from the Substituent Group A as described below.
- An alkyl group (preferably having 1 to 30 carbon atoms, more preferably having 1 to 20 carbon atoms, and particularly preferably having 1 to 10 carbon atoms; for example, methyl, ethyl, isopropyl, t-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, and cyclohexyl), an alkenyl group (preferably having 2 to 30 carbon atoms, more preferably having 2 to 20 carbon atoms, and particularly preferably having 2 to 10 carbon atoms; for example, vinyl, allyl, 2-butenyl, and 3-pentenyl), an alkynyl group (preferably having 2 to 30 carbon atoms, more preferably having 2 to 20 carbon atoms, and particularly preferably having 2 to 10 carbon atoms; for example, propargyl and 3-pentynyl), an aryl group (preferably having 6 to 30 carbon atom
- R 1 to R 14 are each independently preferably a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, or a thio group, more preferably a hydrogen atom, an alkyl group, an aryl group, an amino group, or an alkoxy group, and particularly preferably a hydrogen atom, an alkyl group, an aryl group, or an amino group.
- adjacent substituents may be bonded to each other to form a ring, and in the case of forming a ring, they preferably form an aliphatic ring or a non-aromatic hetero ring, and more preferably form a non-aromatic nitrogen atom-containing hetero ring.
- R 1 to R 14 in the general formula (1) be an electron donating substituent.
- the electron donating substituent refers to a “substituent having ⁇ p denoting a negative value in the Hammett's law”.
- Examples of the electron donating substituent include an amino group, an alkoxy group, an aryloxy group, an alkylthio group, and an arylthio group, and above all, an amino group, an alkoxy group, and an aryloxy group are preferable.
- the position of the electron donating substituent is preferably at least one of R 1 to R 3 and R 8 to R 19 in the general formula (1).
- R 2 when R 2 has the electron donating substituent, R 2 is preferably fused with R 1 or R 3 to form a ring, and when R 9 has the electron donating substituent, R 9 is preferably fused with R 8 or R 10 to form a ring.
- the position of the electron donating substituent is more preferably at least one of R 1 , R 3 , R 8 and R 10 in the general formula (1).
- the wavelength of the luminescent compound represented by the general formula (1) can be shortened, thereby increasing the blue color purity.
- the luminescent compound represented by the general formula (1) is preferably the luminescent compound represented by the general formula (2) or the luminescent compound represented by the general formula (3).
- the luminescent compound represented by the general formula (1) is the luminescent compound represented by the general formula (2).
- R 2 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- R 15 and R 16 each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and may be bonded to each other to form a ring or may be bonded to R 2 or R 14 to form a ring.
- R 2 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- the preferred ranges of R 2 to R 14 in the general formula (2) are the same as the preferred ranges of R 2 to R 14 in the general formula (1).
- R 15 and R 16 each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and may be bonded to each other to form a ring or may be bonded to R 2 or R 14 to form a ring.
- R 15 and R 16 are the same as in the description of the amino group in the Substituent a as described above.
- R 15 and R 16 form a ring
- they are preferably bonded to each other to form a ring or bonded to R 2 to form a ring, and they are more preferably bonded to R 2 to form a ring.
- they preferably form a pyrrole skeleton or a carbazole skeleton.
- R 15 and R 16 are more preferably a substituted or unsubstituted aryl group, and R 15 and R 16 are particularly preferably a substituted or unsubstituted phenyl group. More particularly preferred cases include a case where R 15 and R 16 are both phenyl groups having a substituent from the viewpoint of inhibition of association, or a case where any one of R 15 and R 16 are a phenyl group having a substituent and are combined with R 2 to be subjected to ring fusion, and further, the other is a phenyl group having a substituent.
- the substituent which R 15 and R 16 further have is preferably an alkyl group or an aryl group, more preferably an alkyl group having 1 to 3 carbon atoms, or a phenyl group, particularly preferably a methyl group or an isopropyl group, and more particularly preferably a methyl group.
- the R 15 and R 16 may have a plurality of substituents, and for example, in the case where R 15 and R 16 are phenyl groups, they are preferably ones having 1 or 2 substituents.
- the luminescent compound represented by the general formula (2) is preferably one further having the electron donating substituent in at least one of R 3 and R 8 to R 10 , and in more preferred aspect, the luminescent compound represented by the general formula (2) has an aryl group in R 9 , or an amino group in at least one of R 3 , R 8 , and R 10 .
- R 9 is preferably an aryl group having a substituent, and the substituent is more preferably an alkyl group, and particularly preferably a methyl group. Further, in this case, R 9 is preferably an aryl group having a plurality of the substituents, more preferably an aryl group having 1 to 3 substituents, and particularly preferably an aryl group having 2 substituents.
- the luminescent compound represented by the general formula (1) is preferably a luminescent compound represented by the following general formula (5), (6), or (7).
- R 2 to R 7 and R 9 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- R 17 to R 20 each independently represent alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and R 17 and R 19 may be bonded to any of R 2 , R 14 , or R 18 and any of R 7 , R 9 , or R 20 , respectively, to form a ring.
- R 2 to R 7 and R 9 to R 24 in the general formula (5) have the same definitions as R 2 to R 7 and R 9 to R 14 in the general formula (1).
- R 2 to R 7 and R 9 to R 14 in the general formula (5) are each independently preferably a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a fluorine atom, a cyano group, or an alkoxy group, more preferably a hydrogen atom, an alkyl group, or an aryl group, and particularly preferably a hydrogen atom.
- R 17 to R 20 in the general formula (5) each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom.
- R 17 and R 18 form a ring, they are preferably bonded to each other to form a ring or bonded to R 2 to form a ring, and they are more preferably bonded to R 2 to form a ring.
- R 17 and R 18 are bonded to each other to form a ring, they preferably form a pyrrole skeleton or a carbazole skeleton.
- R 17 and R 18 are more preferably a substituted or unsubstituted aryl group, and particularly preferably a substituted or unsubstituted phenyl group.
- the ranges of the substituents which R 17 and R 18 further have are the same as the ranges of the substituents which R 15 and R 16 in the general formula (2) further have.
- R 19 and R 20 form a ring
- they are preferably bonded to each other to form a ring or bonded to R 9 to form a ring, and they are more preferably bonded to R 9 to form a ring.
- they preferably form a pyrrole skeleton or a carbazole skeleton.
- R 19 and R 20 are more preferably a substituted or unsubstituted aryl group, and particularly preferably a substituted or unsubstituted phenyl group.
- the ranges of the substituents which R 19 and R 20 further have are the same as the ranges of the substituents which R 15 and R 16 in the general formula (2) further have.
- R 2 to R 9 and R 11 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- R 21 to R 24 each independently represent alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and R 21 and R 23 may be bonded to any of R 2 , or R 14 , or R 22 and any of R 9 , R 11 , or R 24 , respectively, to form a ring.
- R 2 to R 9 and R 11 to R 14 in the general formula (6) have the same definitions as R 2 to R 9 and R 11 to R 14 in the general formula (1).
- R 2 to R 9 and R 11 to R 14 in the general formula (6) are each independently preferably a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a fluorine atom, a cyano group, or an alkoxy group, and more preferably a hydrogen atom or an alkyl group.
- R 21 to R 24 in the general formula (6) each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom.
- R 21 and R 22 do not form a ring.
- R 21 and R 22 are more preferably a substituted or unsubstituted aryl group, and particularly preferably a substituted or unsubstituted phenyl group.
- the ranges of the substituents which R 21 and R 22 further have are the same as the ranges of the substituents which R 15 and R 16 in the general formula (2) further have
- R 23 and R 24 form a ring
- they are preferably bonded to each other to form a ring or bonded to R 9 to form a ring, and they are more preferably bonded to R 9 to form a ring.
- they preferably form a pyrrole skeleton or a carbazole skeleton.
- R 23 and R 24 are more preferably a substituted or unsubstituted aryl group, and particularly preferably a substituted or unsubstituted phenyl group.
- the ranges of the substituents which R 23 and R 24 further have are the same as the ranges of the substituents which R 15 and R 16 in the general formula (2) further have.
- R 2 and R 4 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- R 25 to R 28 each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and R 25 and R 27 may be bonded to any of R 2 , R 14 or R 26 and any of R 2 , R 4 or R 28 , respectively, to form a ring.
- R 2 and R 4 to R 14 in the general formula (7) have the same definitions as R 2 and R 4 to R 14 in the general formula (1).
- R 2 and R 4 to R 14 in the general formula (7) are each independently preferably a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a fluorine atom, a cyano group, or an alkoxy group, and more preferably a hydrogen atom or an aryl group.
- R 25 to R 28 in the general formula (7) each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom.
- R 25 and R 26 do not form a ring.
- R 25 and R 26 are more preferably a substituted or unsubstituted aryl group, and particularly preferably a substituted or unsubstituted phenyl group. In a more particularly preferable case, R 25 and R 26 are both substituted phenyl groups.
- the ranges of the substituents which R 25 and R 26 further have are the same as the ranges of the substituents which R 15 and R 16 in the general formula (2) further have.
- R 27 and R 28 do not form a ring.
- R 27 and R 28 are more preferably a substituted or unsubstituted aryl group, and particularly preferably a substituted or unsubstituted phenyl group.
- a more particularly preferred case is a case where R 23 and R 24 are both substituted phenyl groups.
- the ranges of the substituents which R 27 and R 28 further have are the same as the ranges of the substituents which R 15 and R 16 in the general formula (2) further have.
- the luminescent compound represented by the general formula (5) or (7) is more preferred, and the compound represented by the general formula (5) is particularly preferred.
- the luminescent compound represented by the general formula (1) is the luminescent compound represented by the general formula (3).
- R 1 and R 4 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- R 31 to R 33 each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and R 32 and R 33 may be bonded to each other to form a ring.
- R 1 and R 4 to R 14 in the general formula (3) have the same definitions as R 1 and R 4 to R 14 in the general formula (1).
- R 1 and R 4 to R 14 in the general formula (3) are each independently preferably a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a fluorine atom, a cyano group, an amino group, or an alkoxy group, more preferably a hydrogen atom, an alkyl group, an aryl group, or an amino group, and particularly preferably a hydrogen atom or one having an amino group.
- R 31 to R 33 each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and R 32 and R 33 may be bonded to each other to form a ring.
- each substituent other than the hydrogen atom and the deuterium atom represented by R 31 be specifically the following Substituent Group b.
- An alkyl group (preferably having 1 to 30 carbon atoms, more preferably having 1 to 20 carbon atoms, and particularly preferably having 1 to 10 carbon atoms; for example, methyl, ethyl, isopropyl, t-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, and cyclohexyl), an aryl group (preferably having 6 to 30 carbon atoms, more preferably having 6 to 20 carbon atoms, and particularly preferably having 6 to 12 carbon atoms; for example, phenyl, p-methylphenyl, naphthyl, and anthranyl), and a heteroaryl group (preferably having 1 to 30 carbon atoms, and more preferably having 1 to 12 carbon atoms, in which examples of the hetero atom include a nitrogen atom, an oxygen atom, a sulfur atom, a phosphorus atom, a
- substituents may be further substituted, and examples of the additional substituent include the groups selected from the Substituent Group B. Further, the substituent substituted with a substituent may be further substituted, and examples of the additional substituent include the groups selected from the Substituent Group B as described above. In addition, the substituent substituted with the substituent which has been substituted with a substituent may be further substituted, and examples of the additional substituent include the groups selected from the Substituent Group b as described above.
- R 31 is preferably an alkyl group, a perfluoroalkyl group, an aryl group, a heteroaryl group, or a fluorine atom, and more preferably any one of a linear, branched, or cyclic alkyl group having 1 to 10 carbon atoms; an aryl group having 6 to 50 carbon atoms; and a heteroaryl group having 5 to 20 carbon atoms and containing at least any one of N, O, and S as a hetero atom.
- R 31 is particularly preferably an aryl group having 6 to 14 carbon atoms, and more particularly preferably a substituted phenyl group.
- Examples of the substituent which an aryl group having 6 to 14 carbon atoms may have include a linear or branched alkyl group having 1 to 10 carbon atoms, and preferably, for example methyl, ethyl, isopropyl, t-butyl, n-octyl, and n-decyl.
- R 32 and R 33 examples include the Substituent Group A.
- R 32 and R 33 each independently preferably represent an alkyl group, an aryl group, a heteroaryl group, a perfluoroalkyl group, an alkoxy group, or a fluorine atom, and more preferably an alkyl group, an aryl group, and a heteroaryl group.
- R 32 and R 33 each independently particularly preferably represent any one of an a linear, branched, or cyclic alkyl group having 1 to 10 carbon atoms; an aryl group having 6 to 14 carbon atoms; and a heteroaryl group having 5 to 20 carbon atoms and containing at least any one of N, O, and S as a hetero atom); and more particularly preferably a linear or branched alkyl group having 1 to 6 carbon atoms.
- R 32 and R 33 be the same substituents as each other.
- R 32 and R 33 may be combined with each other to form a 5- or 6-membered ring, and the 5- or 6-membered ring thus formed may be anyone of a benzene ring, a heteroaryl ring, a cycloalkyl ring, a cycloalkenyl ring, and a hetero ring.
- the 5- or 6-membered ring thus formed may be any one of a cycloalkenyl ring, a benzene ring, and a heteroaryl ring.
- the heteroaryl ring include those containing 1 to 3 hetero atoms selected from the group consisting of a nitrogen atom, an oxygen atom, and a sulfur atom in the ring-constituting atoms.
- the 5- or 6-membered ring thus formed may have a substituent, examples of the substituent on the carbon atom include the Substituent Group A, and examples of the substituent on the nitrogen atom include the Substituent Group B.
- the 5- or 6-membered ring thus formed is preferably a benzene ring, and more preferably an unsubstituted benzene ring.
- the luminescent compound represented by the general formula (1) is preferably a luminescent compound represented by the following general formula (4) among the luminescent compounds represented by the general formula (3).
- R 1 , R 4 to R 8 and R 11 to R 14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and these may be bonded to each other to form a ring.
- R 31 to R 36 each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom
- R 32 and R 33 may be bonded to each other to form a ring
- R 35 and R 36 may be bonded to each other to form a ring.
- R 1 , R 4 to R 8 and R 11 to R 14 in the general formula (4) have the same definitions as R 1 , R 4 to R 8 and R 11 to R 14 in the general formula (1).
- R 1 , R 4 to R 8 and R 11 to R 14 in the general formula (4) are each independently preferably a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a fluorine atom, a cyano group, or an alkoxy group, more preferably a hydrogen atom, an alkyl group, or an aryl group, and particularly preferably a hydrogen atom.
- R 31 to R 33 have the same definitions as R 31 to R 33 in the general formula (3), and the preferred ranges thereof are also the same.
- R 34 to R 36 each independently represent an alkyl group, an aryl group, a heteroaryl group, or a hydrogen atom, and R 35 and R 36 may be bonded to each other to form a ring.
- the preferred range of R 34 is the same as the preferred range of R 31 in the general formula (3).
- the preferred ranges of R 35 and R 36 are the same as the preferred ranges of R 32 and R 33 in the general formula (3).
- the maximum light emitting wavelength of the organic electroluminescent element using the luminescent compound represented by the general formula (1) is usually less than 455 nm, preferably 400 nm or more and less than 455 nm, more preferably 420 nm or more and less than 455 nm, still more preferably 430 nm or more and less than 455 nm, and most preferably 440 nm or more and less than 455 nm, from the viewpoint of obtaining blue light emission with high color purity.
- the molecular weight of the luminescent compound represented by the general formula (1) is preferably 1000 or less, more preferably 900 or less, particularly preferably 850 or less, and still more preferably 800 or less.
- the sublimation temperature can be lowered, and thus, it is possible to prevent the thermal decomposition of the compound by deposition. Further, the energy required for deposition can be suppressed by decreasing the deposition time.
- a material having a high sublimation temperature can undergo thermal decomposition during long-term deposition, it is favorable that the sublimation temperature be not too high from the viewpoint of deposition suitability.
- the sublimation temperature (which means a temperature which leads to reduction by 10% by mass in the present specification) of the luminescent compound represented by the general formula (1) is preferably 300° C., more preferably 285° C. or lower, and still more preferably 270° C. or lower.
- the luminescent compound represented by the general formula (1) can be synthesized by the method described in Org. Lett., 2003, 2587, or the like, or a combination of other known methods. In addition, for example, it can also be synthesized by a combination of the following schemes.
- Synthesis intermediates having various substituents can be synthesized by a combination of known reactions. Further, for the reaction in each step, the synthesis can be carried out using the conditions described in, for example, Org. Synth., III, 339, (1955) for Ullmann coupling. The subsequent step for a reduction reaction can be carried out under the reaction conditions described in, for example, J. Org. Chem., 1993, 58, 1666.
- the synthesis can be carried out by the method described in, for example, J. Org. Chem., 1987, 52, 1339.
- the synthesis can be carried out by the method described in, for example, Bioorg. Med. Chem. Lett., 2007, 17, 5233.
- the synthesis can be carried out by the method described in, for example, J. Am. Chem. Soc., 2006, 128, 581.
- the subsequent deprotection and TfO-addition can be carried out under the reaction conditions described in, for example, Tetrahedron, 2001, 57, 9575.
- the subsequent coupling reaction by a Pd catatlyst can be carried out under the reaction conditions described in, for example, J. Org. Chem., 2011, 1054.
- each of the substituents may be introduced in any stage for the intermediate.
- purification is preferably carried out by column chromatography, recrystallization, or the like, and then by sublimation purification.
- sublimation purification organic impurities can be separated and inorganic salts, residual solvents, or the like can be removed effectively.
- the maximum light emitting wavelength of the light emitting material for an organic electroluminescent element, represented by general formula (1) is preferably less than 455 nm, more preferably from 400 nm to 455 nm, particularly preferably 420 nm or more and less than 455 nm, still more preferably 430 nm or more and less than 455 nm, and most preferably 440 nm or more and less than 455 nm.
- the organic electroluminescent element of the present invention has a substrate, a pair of electrodes including an anode and a cathode, disposed on the substrate, and at least one organic layer including a light emitting layer, disposed between the electrodes, in which the light emitting layer contains the luminescent compound represented by the general formula (1).
- FIG. 1 shows an example of the configuration of the organic electroluminescent element of the present invention.
- An organic electroluminescent element 10 in FIG. 1 includes organic layers between a pair of electrodes (an anode 3 and a cathode 9 ) on a substrate 2 .
- the element configuration, the substrate, the anode, and the cathode of the organic electroluminescent element are described in detail, for example, in JP-A-2008-270736, and the matters described in the patent publication can be applied to the present invention.
- the organic electroluminescent element of the present invention has a substrate.
- the substrate used in the present invention is preferably a substrate that does not scatter or attenuate light emitted from the organic layer.
- a substrate that does not scatter or attenuate light emitted from the organic layer In the case of an organic material, those having excellent heat resistance, dimensional stability, solvent resistance, electrical insulating properties, and processability are preferred.
- the organic electroluminescent element of the present invention has a pair of electrodes including an anode and a cathode, disposed on the substrate.
- At least one electrode of a pair of electrodes, the anode and the cathode is preferably transparent or semi-transparent.
- the anode may be typically one having a function as an electrode of supplying holes into an organic layer, and is not particularly limited in its shape, structure, size, or the like. Further, depending on the use and purpose of the light emitting element, the anode can be suitably selected from the known electrode materials. As described above, the anode is usually provided as a transparent anode.
- the cathode may be typically one having a function as an electrode of injecting electrons to an organic layer, and is not particularly limited in its shape, structure, size, or the like. Further, depending on the use and purpose of the light emitting element, the cathode can be suitably selected from the known electrode materials.
- the organic electroluminescent element of the present invention includes at least one layer of the organic layer(s) including the light emitting layers disposed between the electrodes, in which the light emitting layer contains the luminescent compound represented by the general formula (1).
- the organic layer is not particularly limited and can be suitably selected depending on the use and purpose of the organic electroluminescent element.
- the organic layer is preferably formed on the transparent electrode or the semi-transparent electrode. In that case, the organic layer is formed on the whole surface or one surface of the transparent electrode or the semi-transparent electrode.
- the shape, the size, the thickness, and the like of the organic layer are not particularly limited and can be suitably selected depending on the purpose.
- the organic layer includes a light emitting layer.
- the organic layer preferably includes a charge transporting layer.
- the charge transporting layer refers to a layer in which charges move when voltage is applied to the organic electroluminescent element. Specifically, examples thereof include a hole injecting layer, a hole transporting layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transporting layer, and an electron injecting layer.
- the charge transporting layer is a hole injecting layer, a hole transporting layer, an electron blocking layer, or a light emitting layer
- an organic electroluminescent element can be prepared with low cost and high efficiency.
- the luminescent compound represented by the general formula (1) is contained in the light emitting layers in the organic layers disposed between the electrodes of the organic electroluminescent element.
- the luminescent compound represented by the general formula (1) may be contained in another organic layer of the organic electroluminescent element of the present invention.
- the organic layer other than the light emitting layer which may contain the luminescent compound represented by the general formula (1), include a hole injecting layer, a hole transporting layer, an electron transporting layer, an electron injecting layer, an exciton blocking layer, and a charge blocking layer (a hole blocking layer, an electron blocking layer, or the like), preferably any one of an exciton blocking layer, a charge blocking layer, an electron transporting layer, and an electron injecting layer, and more preferably an exciton blocking layer, a charge blocking layer, or an electron transporting layer.
- the luminescent compound represented by the general formula (1) is contained in the amount of preferably 0.1% by mass to 100% by mass, more preferably 1% by mass to 50% by mass, and still more preferably 2% by mass to 20% by mass, with respect to the total mass of the light emitting layer.
- the luminescent compound represented by the general formula (1) is contained in an organic layer other than the light emitting layer
- the luminescent compound represented by the general formula (1) is contained in the amount of preferably 70% by mass to 100% by mass, more preferably 80% by mass to 100% by mass, and still more preferably 90% by mass to 100% by mass, with respect to the total mass of the organic layer.
- Each of the organic layers in the organic electroluminescent element of the present invention can be suitably formed by any of dry type film forming methods such as a deposition method and a sputtering method, and wet type film forming methods (solution coating methods) such as a transfer method, a printing method, a spin coating method, and a bar coating method.
- dry type film forming methods such as a deposition method and a sputtering method
- wet type film forming methods such as a transfer method, a printing method, a spin coating method, and a bar coating method.
- the light emitting layer disposed between the pair of electrodes is preferably formed by a vacuum deposition process or a wet process. Further, the light emitting layer is more preferably formed by deposition of a composition containing the luminescent compound represented by the general formula (1) in at least one layer.
- the light emitting layer is a layer having a function of, upon application of an electric field, receiving holes from the anode, the hole injecting layer, or the hole transporting layer, receiving electrons from the cathode, the electron injecting layer, or the electron transporting layer, providing a recombination site of the holes and the electrons, and causing light emitting.
- the light emitting layer in the present invention is not necessarily limited to the light emitting by such a mechanism.
- the light emitting layer in the organic electroluminescent element of the present invention may be constituted of only the light emitting material, or may be constituted as a mixed layer of a host material and the light emitting material.
- the light emitting material may be made of one kind or two or more kinds thereof.
- the host material is preferably a charge transporting material.
- the host material may be made of one kind or two or more kinds thereof. Examples thereof include a configuration in which an electron transporting host material and a hole transporting host material are mixed.
- the light emitting layer may include a material which does not have charge transporting properties and does not emit light.
- the light emitting layer may be made of a single layer or multiple layers of two or more layers.
- Each of the layers may include the same light emitting material or host material, and may also include a different material in every layer. In the case where a plurality of light emitting layers are present, each of the light emitting layers may emit light in a different luminous color from each other.
- the thickness of the light emitting layer is not particularly limited, but it is usually from 2 nm to 500 nm, and above all, from the viewpoint of external quantum efficiency, it is more preferably from 3 nm to 200 nm, and still more preferably from 5 nm to 100 nm.
- the light emitting layer contains the luminescent compound represented by the general formula (1), and the luminescent compound represented by the general formula (1) is used as the light emitting material of the light emitting layer.
- the host material used in the light emitting layer is not particularly limited.
- the host material is a compound which usually plays a role in injecting or transporting charges in the light emitting layer and is also a compound which does not substantially emit light in itself.
- the statement “which does not substantially emit light” means that the amount of light emission from the compound which does not substantially emit light is preferably 5% or less, more preferably 3% or less, and still more preferably 1% or less, with respect to the total amount of light emission in the whole of the element.
- the luminescent compound represented by the general formula (1) is preferably used as the light emitting material, but in this case, it is possible to use the luminescent compound represented by the general formula (1) in combination with light emitting materials different from the compound. Further, in the organic electroluminescent element of the present invention, in the case where the luminescent compound represented by the general formula (1) is used as a host material of the light emitting layer or in the case where the luminescent compound represented by the general formula (1) is used in an organic layer other than the light emitting layer, a light emitting material different from the luminescent compound represented by the general formula (1) is used in the light emitting layer.
- the light emitting material which can be used in the present invention may be any one of a phosphorescent light emitting material, a fluorescent light emitting material, and the like. Further, the light emitting layer in the present invention may contain two or more kinds of light emitting materials in order to improve the color purity or widen the light emitting wavelength region.
- the fluorescent light emitting material and the phosphorescent light emitting material which can be used in the organic electroluminescent element of the present invention are described in detail in, for example, paragraph Nos. [0100] to [0164] of JP-A-2008-270736 and paragraph Nos. [0088] to [0090] of JP-A-2007-266458, and the detailed descriptions in these publications can be applied to the present invention.
- Examples of the phosphorescent light emitting material which can be used in the present invention include phosphorescent light emitting compounds described in patent documents, for example, U.S. Pat. Nos. 6,303,238 and 6,097,147, WO00/57676, WO00/70655, WO01/08230, WO01/39234, WO01/41512, WO02/02714, WO02/15645, WO02/44189, WO05/19373, JP-A-2001-247859, JP-A-2002-302671, JP-A-2002-117978, JP-A-2003-133074, JP-A-2002-235076, JP-A-2003-123982, JP-A-2002-170684, EP1211257, JP-A-2002-226495, JP-A-2002-234894, JP-A-2001-247859, JP-A-2001-298470, JP-A-2002-173674, JP-A-2002-203678
- examples of the light emitting material which is more preferred include phosphorescent light emitting metal complex compounds such as Ir complexes, Pt complexes, Cu complexes, Re complexes, W complexes, Rh complexes, Ru complexes, Pd complexes, Os complexes, Eu complexes, Tb complexes, Gd complexes, Dy complexes, and Ce complexes, and Ir complexes, Pt complexes, and Re complexes are particularly preferred.
- Ir complexes, Pt complexes, and Re complexes each including at least one coordination mode of a metal-carbon bond, a metal-nitrogen bond, a metal-oxygen bond, and a metal-sulfur bond are preferred.
- Ir complexes and Pt complexes are particularly preferred, and Ir complexes are the most preferred.
- the kind of the fluorescent light emitting material which can be used in the present invention is not particularly limited, but examples thereof include those other than the luminescent compound represented by the general formula (1), for example, benzoxazole, benzimidazole, benzothiazole, styrylbenzene, polyphenyl, diphenylbutadiene, tetraphenylbutadiene, naphthalimide, coumarin, pyrane, perinone, oxadiazole, aldazine, pyralizine, cyclopentadiene, bisstyrylanthracene, quinacridone, pyrrolopyridine, thiadiazolopyridine, cyclopentadiene, styrylamine, aromatic fused polycyclic compounds (anthracene, phenanthroline, pyrene, perylene, rubrene, pentacene, and the like), a variety of metal complexes typified by metal complexes of 8-quino
- JP-A-2010-111620 can also be used as a light emitting material.
- the light emitting layer in the organic electroluminescent element of the present invention may be constituted with only a light emitting material or may be constituted as a mixed layer of a host material and a light emitting material.
- the light emitting material may be made of one kind or two or more kinds.
- the host material is preferably a charge transporting material.
- the host material may be made of one kind or two or more kinds. Examples thereof include a configuration in which an electron transporting host material and a hole transporting host material are mixed.
- the light emitting layer may contain a material which does not have charge transporting properties and which does not emit light.
- the light emitting layer may be made of a single layer or two or more layers.
- Each of the layers may include the same light emitting materials or host materials, and may also include different materials from each other over layers. In the case where a plurality of light emitting layers are present, each of the light emitting layers may emit light in different luminous colors from each other.
- the host material is a compound that usually plays a role in injecting or transporting charges in the light emitting layer and is also a compound which does not substantially emit light in itself.
- the statement “which does not substantially emit light” means that the amount of light emission from the compound which does not substantially emit light is preferably 5% or less, more preferably 3% or less, and still more preferably 1% or less of the total amount of light emitting in the whole of the element.
- Examples of the host material which can be used in the organic electroluminescent element of the present invention include the following compounds, other than the luminescent compound represented by the general formula (1):
- conductive high-molecular oligomers such as pyrrole, indole, carbazole, azaindole, azacarbazole, triazole, oxazole, oxadiazole, pyrazole, imidazole, thiophene, benzothiophene, dibenzothiophene, furan, benzofuran, dibenzofuran, polyarylalkane, pyrazoline, pyrazolone, phenylenediamine, arylamine, amino-substituted chalcone, styrylanthracene, fluorenone, hydrazone, stilbene, silazane, aromatic tertiary amine compounds, styrylamine compounds, porphyrin-based compounds, fused ring aromatic hydrocarbon compounds (fluorene, naphthalene, phenanthrene, triphenylene, and the like), polysilane-based compounds, poly(N-vinylcarba
- aromatic hydrocarbon compounds with fused rings are particularly preferred since they are stable.
- aromatic hydrocarbon compounds with fused rings naphthalene-based compounds, anthracene-based compounds, phenanthrene-based compounds, triphenylene-based compounds, and pyrene-based compounds are preferred; anthracene-based compounds and pyrene-based compounds are more preferred; and anthracene-based compounds are particularly preferred.
- anthracene-based compounds those described in paragraph Nos. [0033] to [0064] of WO 2010/134350 are particularly preferred, and examples thereof include Compounds H-1 and H-2 as described later.
- the host material that can be used in the light emitting layer in the organic electroluminescent element of the present invention may be a host material having hole transporting properties or a host material having electron transporting properties.
- the singlet lowest excited energy (S 1 energy) in the film state of the host material is preferably higher than the S 1 energy of the light emitting material from the viewpoints of color purity, luminous efficiency, and driving durability.
- the S 1 of the host material is higher than the S 1 of the light emitting material preferably by 0.1 eV or more, more preferably by 0.2 eV or more, and still more preferably by 0.3 eV or more.
- the content of the host compound in the light emitting layer in the organic electroluminescent element of the present invention is not particularly limited, but from the viewpoint of luminous efficiency and driving voltage, it is preferably from 15% by mass to 95% by mass, with respect to the total mass of the compounds forming the light emitting layer.
- the content of the luminescent compound represented by the general formula (1) is preferably from 50% by mass to 99% by mass, with respect to the total host compounds.
- the organic electroluminescent element of the present invention may include layers other than the light emitting layer.
- Examples of the organic layer other than the light emitting layer which may be included in the organic layer include a hole injecting layer, a hole transporting layer, a blocking layer (a hole blocking layer, an exciton blocking layer, and the like), and an electron transporting layer.
- examples of the layer configuration include those described below, but it should not be construed that the present invention is limited to these configurations.
- the organic electroluminescent element of the present invention preferably includes at least one (A) organic layer which is preferably disposed between the anode and the light emitting layer.
- the (A) organic layer which is preferably disposed between the anode and the light emitting layer include an hole injecting layer, a hole transporting layer, and an electron blocking layer from the anode side.
- the organic electroluminescent element of the present invention preferably includes at least one (B) organic layer which is preferably disposed between the cathode and the light emitting layer.
- the (B) organic layer which is preferably disposed between the cathode and the light emitting layer include an electron injecting layer, an electron transporting layer, and a hole blocking layer from the cathode side.
- an example of the preferred aspects of the organic electroluminescent element of the present invention is the aspect shown in FIG. 1 , in which a hole injecting layer 4 , a hole transporting layer 5 , a light emitting layer 6 , a hole blocking layer 7 , and an electron transporting layer 8 are laminated in this order as the organic layer from the anode 3 side.
- the (A) organic layer preferably disposed between the anode and the light emitting layer will be described.
- the hole injecting layer and the hole transporting layer are layers having a function of receiving holes from the anode or the anode side and transporting them to the cathode side.
- the light emitting element of the present invention preferably includes at least one organic layer between the light emitting layer and the anode, and the organic layer(s) preferably includes at least one compound of the compounds represented by the following general formulae (Sa-1), (Sb-1), and (Sc-1).
- X represents a substituted or unsubstituted alkylene group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenylene group having 2 to 30 carbon atoms, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 2 to 30 carbon atoms, a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms, or a group formed by a combination thereof.
- R S1 , R S2 , and R S3 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms, a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms, a hydroxyl group, a cyano group, or a substituted or unsubstituted amino group.
- Adjacent R S1 and R S2 , and R S3 may be bonded to each other to form a saturated carbocycle or an unsaturated carbocycle.
- Ar S1 and Ar S2 each independently represent a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms.
- R S4 , R S5 , R S6 , and R S7 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms, a hydroxyl group, a cyano group, or a substituted or unsubstituted amino group.
- Adjacent R S4 , R S5 , R S6 , and R S7 may be bonded to each other to form a saturated carbocycle or an unsaturated carbocycle.
- Ar S3 represents a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms.
- R S8 and R S9 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms, or a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms.
- R S10 represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms, or a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms.
- R S11 and R S12 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms, a hydroxyl group, a cyano group, or a substituted or unsubstituted amino group.
- Adjacent R S11 and R S12 may be bonded to each other to form a saturated carbocycle or an unsaturated carbocycle.
- Ar S4 represents a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms.
- Y S1 and Y S2 each independently represent a substituted or unsubstituted alkylene group having 1 to 30 carbon atoms, or a substituted or unsubstituted arylene group having 6 to 30 carbon atoms.
- n and m each independently represent an integer of 0 to 5.
- X represents a substituted or unsubstituted alkylene group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenylene group having 2 to 30 carbon atoms, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 2 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, or a group formed by a combination thereof.
- X is preferably a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, more preferably a substituted or unsubstituted phenylene, a substituted or unsubstituted biphenylene, and a substituted or unsubstituted naphthylene, and still more preferably a substituted or unsubstituted biphenylene.
- R S1 , R S2 , and R S3 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms, a hydroxyl group, a cyano group, or a substituted or unsubstituted amino group.
- Adjacent R S1 , R S2 , and R S3 may be bonded to each other to form a saturated carbocycle or an unsaturated carbocycle.
- saturated carbocycle or the unsaturated carbocycle include naphthalene, azulene, anthracene, fluorene, and phenalene.
- R S1 , R S2 , and R S3 are preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms, or a cyano group, and more preferably a hydrogen atom.
- Ar S1 and Ar S2 each independently represent a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms.
- Ar S1 and Ar S2 are preferably a substituted or unsubstituted phenyl group.
- R S4 , R S5 , R S6 and R S7 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, or a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms, a hydroxyl group, a cyano group, or a substituted or unsubstituted amino group.
- Adjacent R S4 , R S5 , R S6 and R S7 may be bonded to each other to form a saturated carbocycle or an unsaturated carbocycle.
- saturated carbocycle or the unsaturated carbocycle include naphthalene, azulene, anthracene, fluorene, and phenalene.
- R S4 , R S5 , R S6 and R S7 are preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms, or a cyano group, and more preferably a hydrogen atom.
- Ar S3 represents a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms.
- Ar S3 is preferably a substituted or unsubstituted phenyl group.
- R S8 and R S9 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms, or a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms.
- R S8 and R S9 are preferably a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, and more preferably a methyl group or a phenyl group.
- R S10 is a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms, or a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms.
- R S10 is preferably a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, and more preferably a phenyl group.
- R S11 and R S12 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms, a hydroxyl group, a cyano group, or a substituted or unsubstituted amino group.
- Adjacent R S11 and R S12 may be bonded to each other to form a saturated carbocycle or an unsaturated carbocycle.
- saturated carbocycle or the unsaturated carbocycle include naphthalene, azulene, anthracene, fluorene, and phenalene.
- R S11 and R S12 are preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms, or a cyano group, and more preferably a hydrogen atom.
- Ar S4 represents a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms.
- Y S1 and Y S2 represent a substituted or unsubstituted alkylene having 1 to 30 carbon atoms, or substituted or unsubstituted arylene having 6 to 30 carbon atoms.
- Y S1 and Y S2 are preferably a substituted or unsubstituted arylene having 6 to 30 carbon atoms, and more preferably a substituted or unsubstituted phenylene.
- n is an integer of 0 to 5, preferably 0 to 3, more preferably 0 to 2, and still more preferably 0.
- m is an integer of 0 to 5, preferably 0 to 3, more preferably 0 to 2, and still more preferably 1.
- the general formula (Sa-1) is preferably a compound represented by the following general formula (Sa-2).
- R S1 , R S2 , and R S3 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms, a hydroxyl group, a cyano group, or a substituted or unsubstituted amino group.
- Adjacent R S2 , R S2 , and R S3 may be bonded to each other to form a saturated carbocycle or an unsaturated carbocycle.
- Q Sa s each independently represent a hydrogen atom, a cyano group, a fluorine atom, an alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, an aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, or a substituted or unsubstituted amino group.
- R S1 , R S2 , and R S3 have the same definitions as those in the general formula (Sa-1), and their preferred ranges are also the same.
- Q Sa s each independently represent a hydrogen atom, a cyano group, a fluorine atom, an alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, an aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, or a substituted or unsubstituted amino group.
- Q Sa is preferably a hydrogen atom, a cyano group, a fluorine atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, more preferably a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, and still more preferably a hydrogen atom.
- the general formula (Sb-1) is preferably a compound represented by the following general formula (Sb-2).
- R S4 , R S5 , R S6 , and R S7 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms, a hydroxyl group, a cyano group, or a substituted or unsubstituted amino group.
- Adjacent R S4 , R S5 , R S6 and R S7 may be bonded to each other to form a saturated carbocycle or an unsaturated carbocycle.
- Q Sb represents a hydrogen atom, a cyano group, a fluorine atom, an alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, an aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, or a substituted or unsubstituted amino group.
- R S4 , R S5 , R S6 and R S7 have the same definitions as those in the general formula (Sb-1), and their preferred ranges are also the same.
- Q Sa represents a hydrogen atom, a cyano group, a fluorine atom, an alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, an aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, or a substituted or unsubstituted amino group.
- Q Sa is preferably a hydrogen atom, a cyano group, a fluorine atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, more preferably a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, and still more preferably a hydrogen atom.
- the general formula (Sc-1) is preferably a compound represented by the following general formula (Sc-2).
- R S8 and R S9 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms, or a substituted or unsubstituted fused polycyclic group having to 30 carbon atoms.
- R S10 represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms, or a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms.
- R S11 and R S12 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, or a substituted or unsubstituted fused polycyclic group having 5 to 30 carbon atoms, a hydroxyl group, a cyano group, or a substituted or unsubstituted amino group.
- Adjacent R S11 and R S12 may be bonded to each other to form a saturated carbocycle or an unsaturated carbocycle.
- Q Sc represents a hydrogen atom, a cyano group, a fluorine atom, an alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, an aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, or a substituted or unsubstituted amino group.
- R S8 , R S9 , R S10 , R S11 and R S12 have the same definitions as those in the general formula (Sc-1), and their preferred ranges are also the same.
- Q Sc represents a hydrogen atom, a cyano group, a fluorine atom, an alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, an aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocycle having 2 to 30 carbon atoms, or a substituted or unsubstituted amino group.
- Q Sc is preferably a hydrogen atom, a cyano group, a fluorine atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, more preferably a hydrogen atom, or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, and still more preferably a phenyl group.
- the compound represented by the general formula (Sa-1), (Sb-1), or (Sc-1) can be synthesized by the method described in JP-A-2007-318101. After the synthesis, purification is preferably carried out by column chromatography, recrystallization, reprecipitation, or the like, and then by sublimation purification. By the sublimation purification, organic impurities can be separated and inorganic salts, residual solvents, moisture, or the like can be removed effectively.
- the compound represented by the general formula (Sa-1), (Sb-1), or (Sc-1) is preferably contained in the organic layer between the light emitting layer and the anode, and above all, it is more preferably contained in the layer on the anode side adjacent to the light emitting layer, and it is particularly preferably a hole transporting material contained in the hole transporting layer.
- the compound represented by the general formula (Sa-1), (Sb-1), or (Sc-1) is contained in the amount of preferably from 70% by mass to 100% by mass, and more preferably from 85% by mass to 100% by mass, with respect to the total mass of the organic layer added.
- the organic electroluminescent element of the present invention is a material which is particularly preferably used in the (A) organic layer preferably disposed between the anode and the light emitting layer, and examples thereof include at least one kind of compound represented by the following general formula (M-3).
- the compound represented by the general formula (M-3) is more preferably contained in the organic layer adjacent to the light emitting layer between the light emitting layer and the anode, but is not limited in its uses and may be further contained in any layer in the organic layers.
- a layer into which the compound represented by the general formula (M-3) is introduced may contain any one or a plurality of a light emitting layer, a hole injecting layer, a hole transporting layer, an electron transporting layer, an electron injecting layer, and a charge blocking layer.
- the organic layer adjacent to the light emitting layer between the light emitting layer and the anode, in which the compound represented by the general formula (M-3) is contained, is more preferably an electron blocking layer or a hole transporting layer.
- R S1 to R S5 each independently represent an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, —CN, a perfluoroalkyl group, a trifluorovinyl group, —CO 2 R, —C(O)R, —NR 2 , —NO 2 , —OR, a halogen atom, an aryl group, or a heteroaryl group, and may further have a substituent Z.
- R S1 to R S5 each independently represent a hydrogen atom, an alkyl group, a perhaloalkyl group, an alkenyl group, an alkynyl group, a heteroalkyl group, an aryl group, or a heteroaryl group.
- those groups may be bonded to each other to form a ring, and may further have a substituent Z.
- a represents an integer of 0 to 4, and when a plurality of R S1 s are present, the R S1 s may be the same as or different from one another, and may be bonded to each other to form a ring.
- b to e each independently represent an integer of 0 to 5, and when a plurality of groups are present for each R S2 to R S5 , the groups may be the same as or different from one another, and any two thereof may be bonded to each other to form a ring.
- q is an integer of 1 to 5, and when q is 2 or more, a plurality of R S1 s may be the same as or different from one another and may be bonded to each other to form a ring.
- the alkyl group may have a substituent and may be saturated or unsaturated, and examples of the group that may be substituted include the substituent Zs as described above.
- the alkyl group represented by R S1 to R S5 is preferably an alkyl group having a total carbon number of 1 to 8, and more preferably an alkyl group having a total carbon number of 1 to 6, and examples thereof include a methyl group, an ethyl group, an i-propyl group, a cyclohexyl group, and a t-butyl group.
- the cycloalkyl group may have a substituent and may be saturated or unsaturated, and examples of the group that may be substituted include the substituent Zs as described above.
- the cycloalkyl group represented by R S1 to R S5 is preferably a cycloalkyl group having 4 to 7 ring members, and more preferably a cycloalkyl group having a total carbon number of 5 or 6, and examples thereof include a cyclopenthyl group and a cyclohexyl group.
- the alkenyl group represented by R S1 to R S5 preferably has 2 to 30 carbon atoms, more preferably has 2 to 20 carbon atoms, and particularly preferably has 2 to 10 carbon atoms, and examples thereof include vinyl, allyl, 1-propenyl, 1-isopropenyl, 1-butenyl, 2-butenyl, and 3-pentenyl.
- the alkynyl group represented by R S1 to R S5 preferably has 2 to 30 carbon atoms, more preferably has 2 to 20 carbon atoms, and particularly preferably has 2 to 10 carbon atoms, and examples thereof include ethynyl, propargyl, 1-propynyl, and 3-pentynyl.
- the perfluoroalkyl group represented by R S1 to R S5 includes a group obtained by substituting all the hydrogen atoms in the above-mentioned alkyl group with fluorine atoms.
- the aryl group represented by R S1 to R S5 is preferably a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, and examples thereof include a phenyl group, a tolyl group, a biphenyl group, and a terphenyl group.
- the heteroaryl group represented by R S1 to R S5 is preferably a heteroaryl group having 5 to 8 carbon atoms, and more preferably a substituted or unsubstituted 5- or 6-membered heteroaryl group, and examples thereof include a pyridyl group, a pyrazinyl group, a pyridazinyl group, a pyrimidinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a quinazolinyl group, a cinnolinyl group, a phthalazinyl group, a quinoxalinyl group, a pyrrolyl group, an indolyl group, a furyl group, a benzofuryl group, a thienyl group, a benzothienyl group, a pyrazolyl group, an imidazolyl group, a benzimidazolyl group,
- Preferred examples thereof include a pyridyl group, a pyrimidinyl group, an imidazolyl group, and a thienyl group, and more preferred examples thereof include a pyridyl group and a pyrimidinyl group.
- R S1 to R S5 are each preferably a hydrogen atom, an alkyl group, a cyano group, a trifluoromethyl group, a perfluoroalkyl group, a dialkylamino group, a fluoro group, an aryl group, or a heteroaryl group, more preferably a hydrogen atom, an alkyl group, a cyano group, a trifluoromethyl group, a fluoro group, or an aryl group, and still more preferably a hydrogen atom, an alkyl group, or an aryl group.
- the substituent Z is preferably an alkyl group, an alkoxy group, a fluoro group, a cyano group, or a dialkylamino group, and more preferably a hydrogen atom or an alkyl group.
- R S1 to R S5 may be bonded to each other to form a fused 4- to 7-membered ring, the fused 4- to 7-membered ring is cycloalkyl, aryl, or heteroaryl, and the fused 4- to 7-membered ring may further have a substituent Z.
- the definitions and the preferred ranges of the formed cycloalkyl, aryl and heteroaryl are the same as those of the cycloalkyl group, the aryl group, and the heteroaryl group defined in R S1 to R S5 .
- the compound represented by the general formula (M-3) is preferably contained in an amount of 50% by mass to 100% by mass, more preferably contained in an amount of 80% by mass to 100% by mass, and particularly preferably contained in an amount of 95% by mass to 100% by mass.
- the compound represented by the general formula (M-3) is used in a plurality of organic layers, the compound is preferably contained in each layer within the above range.
- the thickness of the hole transporting layer containing the compound represented by the general formula (M-3) is preferably from 1 nm to 500 nm, more preferably from 3 nm to 200 nm, and still more preferably from 5 nm to 100 nm.
- the hole transporting layer is preferably provided to be adjacent to the light emitting layer.
- the hole injecting layer preferably contains an electron receptive dopant.
- an electron receptive dopant By incorporating the electron receptive dopant in the hole injecting layer, there are effects in which, for example, the hole injecting properties are improved, the driving voltage is lowered, and the efficiency is improved.
- the electron receptive dopant may be any one of organic materials and inorganic materials as long as it is capable of withdrawing electrons from a material to be doped and generating radical cations, and examples thereof include TCNQ compounds such as tetracyanoquinodimethane (TCNQ) and tetrafluorotetracyanoquinodimethane (F 4 -TCNQ), hexaazatriphenylene compounds such as hexacyanohexaazatriphenylene (HAT-CN), and molybdenum oxide.
- TCNQ compounds such as tetracyanoquinodimethane (TCNQ) and tetrafluorotetracyanoquinodimethane (F 4 -TCNQ)
- hexaazatriphenylene compounds such as hexacyanohexaazatriphenylene (HAT-CN)
- molybdenum oxide molybdenum oxide
- the electron receptive dopant in the hole injecting layer is contained in the amount of preferably from 0.01% by mass to 50% by mass, more preferably from 0.1% by mass to 40% by mass, and still more preferably from 0.2% by mass to 30% by mass, with respect to the total mass of the compounds forming the hole injecting layer.
- the electron blocking layer is a layer having a function of preventing the electrons, which have been transported from the cathode side to the light emitting layer, from passing through to the anode side.
- the electron blocking layer can be provided as an organic layer adjacent to the light emitting layer on the anode side.
- organic compound constituting the electron blocking layer for example, those exemplified above as the hole transporting material can be applied.
- the thickness of the electron blocking layer is preferably from 1 nm to 500 nm, more preferably from 3 nm to 100 nm, and still more preferably from 5 nm to 50 nm.
- the electron blocking layer may have either a single layer structure composed of one kind or two or more kinds of materials selected from the above-exemplified materials or a multilayer structure composed of a plurality of layers having the same composition or different compositions.
- the material used in the electron blocking layer preferably has higher S 1 energy than that of the light emitting material from the viewpoints of color purity, luminous efficiency, and driving durability.
- the S 1 in the film state of the material used in the electron blocking layer is higher than the S 1 of the light emitting material preferably by 0.1 eV or more, more preferably by 0.2 eV or more, and still more preferably by 0.3 eV or more.
- the electron injecting layer and the electron transporting layer are layers having a function of receiving electrons from the cathode or the cathode side and transporting them to the anode side.
- the electron injecting material and the electron transporting material used in these layers may be either a low-molecular compound or a high-molecular compound.
- the luminescent compound represented by the general formula (1) can be used.
- the other electron transporting materials any one selected from aromatic ring tetracarboxylic acid anhydrides, such as pyridine derivatives, quinoline derivatives, pyrimidine derivatives, pyrazine derivatives, phthalazine derivatives, phenanthroline derivatives, triazine derivatives, triazole derivatives, oxazole derivatives, oxadiazole derivatives, imidazole derivatives, benzimidazole derivatives, imidazopyridine derivatives, fluorenone derivatives, anthraquinodimethane derivatives, anthrone derivatives, diphenylquinone derivatives, thiopyranedioxide derivatives, carbodiimide derivatives, fluorenylidenemethane derivatives, distyrylpyrazine derivatives, naphthalene, and perylene; various metal complexes typified by metal
- the thickness of each of the electron injecting layer and the electron transporting layer is preferably 500 nm or less.
- the thickness of the electron transporting layer is preferably from 1 nm to 500 nm, more preferably from 5 nm to 200 nm, and still more preferably from 10 nm to 100 nm.
- the thickness of the electron injecting layer is preferably from 0.1 nm to 200 nm, more preferably from 0.2 nm to 100 nm, and still more preferably from 0.5 nm to 50 nm.
- the electron injecting layer and the electron transporting layer may have either a single layer structure composed of one kind or two or more kinds of the above-described materials or a multilayer structure composed of a plurality of layers having the same composition or different compositions.
- the electron injecting layer preferably contains an electron donating dopant.
- an electron donating dopant By incorporating the electron donating dopant in the electron injecting layer, there are effects that, for example, the electron injecting properties are improved, the driving voltage is lowered, and the efficiency is improved.
- the electron donating dopant may be any one of organic materials and inorganic materials as long as it is capable of giving electrons to the material to be doped and generating radical anions, and examples thereof include dihydroimidazole compounds such as tetrathiafulvalene (TTF), tetrathianaphthacene (TTT), and bis-[1,3-diethyl-2-methyl-1,2-dihydrobenzimidazolyl], lithium, and cesium.
- TTF tetrathiafulvalene
- TTT tetrathianaphthacene
- the electron donating dopant in the electron injecting layer is contained in the amount of preferably from 0.01% by mass to 50% by mass, more preferably from 0.1% by mass to 40% by mass, and still more preferably 0.5% by mass to 30% by mass, with respect to the total mass of the compounds forming the electron injecting layer.
- the hole blocking layer is a layer having a function of preventing holes, which have been transported from the anode side to the light emitting layer, from passing through to the cathode side.
- the hole blocking layer can be provided as an organic layer adjacent to the light emitting layer on the cathode side.
- the S 1 energy of the organic compound in the film state constituting the hole blocking layer prevents the energy movement of excitons produced in the light emitting layer, and thus, does not lower the luminous efficiency, it is preferably higher than S 1 energy of the light emitting material.
- the luminescent compound represented by the general formula (1) can be used as an example of the organic compound constituting the hole blocking layer.
- Examples of the organic compounds constituting the hole blocking layer, other than the luminescent compound represented by the general formula (1), include aluminum complexes such as aluminum (III) bis(2-methyl-8-quinolinato)-4-phenylphenolate (abbreviated as BAlq), triazole derivatives, and phenanthroline derivatives such as 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (abbreviated as BCP).
- aluminum complexes such as aluminum (III) bis(2-methyl-8-quinolinato)-4-phenylphenolate (abbreviated as BAlq)
- BAlq bis(2-methyl-8-quinolinato)-4-phenylphenolate
- BCP 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline
- the thickness of the hole blocking layer is preferably from 1 nm to 500 nm, more preferably from 3 nm to 100 nm, and still more preferably from 5 nm to 50 nm.
- the hole blocking layer may have either a single layer structure composed of one kind or two or more kinds of the above-described materials or a multilayer structure composed of a plurality of layers having the same composition or different compositions.
- the material used in the hole blocking layer preferably has higher S 1 energy than that of the light emitting material from the viewpoints of color purity, luminous efficiency, and driving durability.
- the S 1 in the film state of the material used in the hole blocking layer is preferably higher than the S 1 of the light emitting material by 0.1 eV or more, more preferably by 0.2 eV or more, and still more preferably by 0.3 eV or more.
- examples of the material which is particularly preferably used in the (B) materials for an organic layer, preferably disposed between the cathode and the light emitting layer include the luminescent compound represented by the general formula (1), a compound represented by the following general formula (P-1), and a compound represented by the following general formula (O-1).
- the organic electroluminescent element of the present invention preferably includes at least one organic layer between the light emitting layer and the cathode, and the organic layer preferably contains at least one of compounds represented by the following general formula (O-1), from the viewpoint of efficiency or driving voltage of an element.
- the general formula (O-1) will be described.
- R O1 represents an alkyl group, an aryl group, or a heteroaryl group.
- a O1 to A O4 each independently represent C—R A or a nitrogen atom.
- R A represents a hydrogen atom, an alkyl group, an aryl group, or a heteroaryl group, and a plurality of R A s may be the same as or different from each other.
- L O1 represents any of divalent to hexavalent linking groups with an aryl ring or a heteroaryl ring.
- n O1 represents an integer of 2 to 6).
- R O1 represents an alkyl group (preferably having 1 to 8 carbon atoms), an aryl group (preferably having 6 to 30 carbon atoms), or a heteroaryl group (preferably having 4 to 12 carbon atoms), which may have a substituent selected from the Substituent Group A as described above.
- R O1 is preferably an aryl group or a heteroaryl group, and more preferably an aryl group.
- Preferred examples of the substituent in the case where the aryl group of R O1 has a substituent include an alkyl group, an aryl group, and a cyano group, more preferred examples thereof include an alkyl group and an aryl group, and still more preferred examples thereof include an aryl group.
- the aryl group of R O1 has a plurality of substituents
- the plurality of substituents may be bonded to each other to form a 5- or 6-membered ring.
- the aryl group of R O1 is preferably a phenyl group which may have a substituent selected from Substituent Group A, more preferably a phenyl group which may be substituted with an alkyl group or an aryl group, and still more preferably an unsubstituted phenyl group or 2-phenylphenyl group.
- a O1 to A O4 each independently represent C—R A or a nitrogen atom. It is preferable that 0 to 2 groups out of A O1 to A O4 be nitrogen atoms; and it is more preferable that 0 or 1 group out of A O1 to A O4 be nitrogen atoms.
- a O1 to A O4 be C—R A , or A O1 be a nitrogen atom, and A O2 to A O4 be C—R A ; it is more preferable that A O1 be a nitrogen atom, and A O2 to A O4 be C—R A ; and it is still more preferable that A O1 be a nitrogen atom, A O2 to A O4 be C—R A , and R A s be all hydrogen atoms.
- R A represents a hydrogen atom, an alkyl group (preferably having 1 to 8 carbon atoms), an aryl group (preferably having 6 to 30 carbon atoms), or a heteroaryl group (preferably having 4 to 12 carbon atoms), which may have a substituent selected from the Substituent Group A as described above. Further, a plurality of R A s may be the same as or different from each other. R A is preferably a hydrogen atom or an alkyl group, and more preferably a hydrogen atom.
- L O1 represents any of a divalent to hexavalent linking group including an aryl ring (preferably having 6 to 30 carbon atoms) or a heteroaryl ring (preferably having 4 to 12 carbon atoms).
- L O1 is preferably an arylene group, a heteroarylene group, an aryltriyl group, or a heteroaryltriyl group, more preferably a phenylene group, a biphenylene group, or a benzenetriyl group, and still more preferably a biphenylene group or a benzenetriyl group.
- L O1 may have a substituent selected from the Substituent Group A as described above, and in a case of having the substituent, the substituent is preferably an alkyl group, an aryl group, or a cyano group. Specific examples of L O1 include the following.
- n O1 represents an integer of 2 to 6, preferably an integer of 2 to 4, and more preferably 2 or 3. n O1 is most preferably 3 from the viewpoint of the efficiency of an element, or most preferably 2 from the viewpoint of the durability of an element.
- the glass transition temperature (Tg) of the compound represented by the general formula (O-1) is preferably from 100° C. to 300° C., more preferably from 120° C. to 300° C., still more preferably from 120° C. to 300° C., and even still more preferably from 140° C. to 300° C., from the viewpoint of stability at the time of storage at a high temperature, or stable operation during driving at a high temperature or against heat generation during driving.
- the compound represented by the general formula (O-1) can be synthesized by the method described in JP-A-2001-335776. After the synthesis, purification is preferably carried out by column chromatography, recrystallization, reprecipitation, or the like, and then by sublimation purification. By the sublimation purification, organic impurities can be separated and inorganic salts, residual solvents, moisture, or the like can be removed effectively.
- the compound represented by the general formula (O-1) is preferably contained in the organic layer between the light emitting layer and the cathode, however, it is more preferably contained in the layer on the cathode side adjacent to the light emitting layer.
- the compound represented by the general formula (O-1) is contained in the amount of preferably from 70% by mass to 100% by mass, and more preferably from 85% by mass to 100% by mass, with respect to the total mass of the organic layer added.
- the organic electroluminescent element of the present invention preferably includes at least one layer of organic layers between the light emitting layer and the cathode, and it is preferable that the organic layer contain at least one of compounds represented by the following general formula (P), from the viewpoint of efficiency or the driving voltage of an element.
- P general formula
- R P represents an alkyl group (preferably having 1 to 8 carbon atoms), an aryl group (preferably having 6 to 30 carbon atoms), or a heteroaryl group (preferably having 4 to 12 carbon atoms), which may have a substituent selected from the Substituent Group A as described above.
- nP represents an integer of 1 to 10, and in the case where there are a plurality of R P s, these may be the same as or different from each other.
- At least one of R P s is a substituent represented by the following general formulae (P-1) to (P-3).
- R P1 to R P3 and R′ P1 to R′ P3 each represent an alkyl group (preferably having 1 to 8 carbon atoms), an aryl group (preferably having 6 to 30 carbon atoms), or a heteroaryl group (preferably having 4 to 12 carbon atoms), which may have a substituent selected from the Substituent Group A as described above.
- n P1 to n P2 each represent an integer of 0 to 4, and in the case where there are a plurality of R P1 to R P3 and R′ P1 to R′ P3 , they may be the same as or different from each other.
- L P1 to L P3 represents any one of divalent linking groups consisting of a single bond, an aryl ring, and a heteroaryl ring. * represents a binding position with the anthracene ring of the general formula (P).)
- a preferred substituent other than the substituents represented by (P-1) to (P-3) as R P is an aryl group, more preferred substituent is any one of a phenyl group, a biphenyl group, a terphenyl group, and a naphthyl group, and still more preferred substituent is a naphthyl group.
- R P1 to R P3 and R′ P1 to R′ P3 are preferably any one of an aryl group and a heteroaryl group, more preferably an aryl group, still more preferably any one of a phenyl group, a biphenyl group, a terphenyl group, and a naphthyl group, and most preferably a phenyl group.
- L P1 to L P3 are preferably any one of divalent linking groups consisting of a single bond and an aryl ring, more preferably any one of a single bond, phenylene, biphenylene, terphenylene, and naphthylene, and still more preferably any one of a single bond, phenylene, and naphthylene.
- the compound represented by the general formula (P) can be synthesized by the method described in WO 2003/060956 and WO 2004/080975. After the synthesis, purification is preferably carried out by column chromatography, recrystallization, reprecipitation, or the like, and then by sublimation purification. By the sublimation purification, organic impurities can be separated and inorganic salts, residual solvents, moisture, or the like can be removed effectively.
- the compound represented by the general formula (P) is preferably contained in the organic layer between the light emitting layer and the cathode, and more preferably contained in the layer adjacent to the cathode.
- the compound represented by the general formula (P) is contained in the amount of preferably from 70% by mass to 100% by mass, and more preferably from 85% by mass to 100% by mass, with respect to the total mass of the organic layer added.
- Preferred examples of the other material used in the electron injecting layer or the electron transporting layer in the organic electroluminescent element of the present invention include silole compounds described in JP-A-09-194487 or the like, phosphineoxide compounds described in JP-A-2006-73581 or the like, nitrogen-containing aromatic 6-membered ring hetero compounds described in JP-A-2005-276801, JP-A-2006-225320, WO 2005/085387, or the like, compounds having nitrogen-containing aromatic 6-membered hetero structures and carbazole structures, described in WO 2003/080760, WO 2005/085387, or the like, and aromatic hydrocarbon compounds described in US2009/0009065, WO 2010/134350, JP-T-2010-535806, or the like (naphthalene compounds, anthracene compounds, triphenylene compounds, phenanthrene compounds, pyrene compounds, fluoranthene compounds, and the like).
- the entirety of the organic electroluminescent element may be protected by a protective layer.
- the materials for the protective layer may be either an inorganic material or an organic material.
- the entirety of the element may be sealed using a sealing enclosure.
- JP-A-2008-270736 For the sealing enclosure, the detailed description in paragraph No. [0171] of JP-A-2008-270736 can be applied to the present invention.
- the organic electroluminescent element of the present invention can emit light by applying a direct current (it may contain an alternate current component, if necessary) voltage (typically from 2 volts to 15 volts) or a direct current between the anode and the cathode.
- driving methods described in each of the publications of JP-A-2-148687, JP-A-6-301355, JP-A-5-29080, JP-A-7-134558, JP-A-8-234685, and JP-A-8-241047, Japanese Patent No. 2784615, and U.S. Pat. Nos. 5,828,429 and 6,023,308 can be applied.
- the external quantum efficiency of the organic electroluminescent element of the present invention is preferably 5% or more, more preferably 6% or more, and still more preferably 7% or more.
- a maximum value of the external quantum efficiency obtained when the organic electroluminescent element is driven at 20° C., or a value of the external quantum efficiency in the vicinity of from 300 cd/m 2 to 400 cd/m 2 obtained when the element is driven at 20° C. can be employed.
- the internal quantum efficiency of the organic electroluminescent element of the present invention is preferably 30% or more, more preferably 50% or more, and still more preferably 70% or more.
- the internal quantum efficiency of the element is calculated by dividing the external quantum efficiency by the light extraction efficiency.
- the light extraction efficiency in usual organic EL elements is about 20%, but by adjusting the shape of a substrate, the shape of an electrode, the thickness of an organic layer, the thickness of an inorganic layer, the refractive index of an organic layer, the refractive index of an inorganic layer, or the like, it is possible to increase the light extraction efficiency to 20% or more.
- the organic electroluminescent element of the present invention its light emitting wavelength is not limited, but is preferably used for blue or white light emission.
- the luminescent compound represented by the general formula (1) is preferably used as a light emitting material to emit fluorescent light, and particularly preferably to emit blue light.
- the organic electroluminescent element of the present invention can be suitably used for display elements, displays, backlights, electrophotography, illumination light sources, recording light sources, exposure light sources, readout light sources, signs, billboards, interior decorations, optical communications, and the like, and particularly preferably for devices driven in a region of high-intensity luminescence, such as a light emitting device, an illumination device, and a display device.
- the light emitting device of the present invention includes the organic electroluminescent element of the present invention.
- the light emitting device of the present invention is formed by using the organic electroluminescent element.
- FIG. 2 is a cross-sectional view schematically showing one example of the light emitting device of the present invention.
- the light emitting device 20 in FIG. 2 includes a transparent substrate 2 (supporting substrate), an organic electroluminescent element 10 , a sealing enclosure 16 , and the like.
- the organic electroluminescent element 10 is formed by laminating on the substrate 2 an anode 3 (first electrode), an organic layer 11 , and a cathode 9 (second electrode) in this order.
- a protective layer 12 is laminated on the cathode 9 , and the sealing enclosure 16 is further provided via an adhesive layer 14 on the protective layer 12 .
- a part of each of the electrodes 3 and 9 , a diaphragm, an insulating layer, and the like are omitted.
- thermosetting adhesive such as an epoxy resin, or a thermosetting adhesive can be used for the adhesive layer 14 , and for example, a thermosetting adhesive sheet may also be used.
- the light emitting device of the present invention is not particularly limited in its use, and it can be used as not only an illumination device but also a display device of a television set, a personal computer, a mobile phone, electronic paper, or the like.
- the illumination device of the present invention includes the organic electroluminescent element of the present invention.
- FIG. 3 is a cross-sectional view schematically showing one example of the illumination device of the present invention.
- the illumination device 40 of the present invention includes, as shown in FIG. 3 , the above-described organic EL element 10 and a light scattering member 30 . More specifically, the illumination device 40 is configured such that the substrate 2 of the organic EL element 10 and the light scattering member 30 are in contact with each other.
- the light scattering member 30 is not particularly limited as long as it can scatter light, but in FIG. 3 , a member obtained by dispersing fine particles 32 in a transparent substrate 31 is used. Suitable examples of the transparent substrate 31 include a glass substrate, and suitable examples of the fine particles 32 include transparent resin fine particles. As the glass substrate and the transparent resin fine particles, a known product can be used for both. In such an illumination device 40 , when light emitted from the organic electroluminescent element 10 is incident on the light incident surface 30 A of the scattering member 30 , the incident light is scattered by the light scattering member 30 and the scattered light is output as illuminating light from the light output surface 30 B.
- the display device of the present invention may include the organic electroluminescent element of the present invention.
- the display device of the present invention may be used for, for example, a display device of a television set, a personal computer, a mobile phone, electronic paper, or the like.
- the luminescent compound represented by the general formula (1) (light emitting material for an organic electroluminescent element) can be synthesized by a combination of known reactions. Representative examples of the specific synthesis procedure of the luminescent compound represented by the general formula (1) will be described below.
- the light emitting material 1 was synthesized according to the synthesis scheme with reference to the well-known literature.
- Tf represents a trifuryl group and TfO represents —OSO 2 CF 3 .
- the light emitting materials 13, 17, 26, 32, and 34 used in Examples were synthesized by a method similar to that for the light emitting material 1.
- the comparative compounds 1 to 3 used as the comparative light emitting materials have the following structures.
- the comparative compound 1 is the compound described in JP-A-2005-82702, and the comparative compound 2 is the compound described in JP-A-05-214334.
- the following host material H-5 and each of light emitting materials described in Table 1 below were deposited on a 25 mm ⁇ 25 mm ⁇ 0.7 mm quartz glass substrate by a vacuum deposition method in a mass ratio (93:7), thereby forming a thin film having a film thickness of 50 nm.
- the obtained film was irradiated with UV rays of 350 nm to emit light.
- the luminous spectrum at a time of light emission was measured using a fluorescent spectrophotometer (FP-6300, manufactured by JASCO Corporation) and the chromaticity (x, y) was determined. Based on the y values at that time, the chromaticity was evaluated as the following 3 grades. The results are shown in Table 1 below.
- the light emitting material for an organic electroluminescent element of the present invention has good chromaticity and heat resistance.
- the number of hydrogen atoms or deuterium atoms in R 1 to R 14 of the general formula (1) is 6, and the comparative compound 1 described in JP-A-2005-82702, which has the number below the lower limit of the range in the present invention, has poor heat resistance as a light emitting material for an organic electroluminescent element.
- the comparative compound 3 having no skeleton of the general formula (1) has poor chromaticity as a light emitting material for an organic electroluminescent element.
- the materials used for the fabrication of organic electroluminescent elements were all subjected to sublimation purification and it was confirmed that the purity (absorption intensity area ratio at 254 nm) was 99.9% or more by using high performance liquid chromatography (TSKgel ODS-100Z, manufactured by Tosoh Corporation).
- a 0.5 mm-thick and 2.5 cm square glass substrate (manufactured by Geomatec Co., Ltd., surface resistance: 10 ⁇ / ⁇ ) having an ITO film thereon was put in a cleaning container. After ultrasonic cleaning in 2-propanol, the glass substrate was subjected to a UV-ozone treatment for 30 minutes. The following organic compound layers were deposited sequentially on this transparent anode (ITO film) by a vacuum deposition method.
- the deposition rates in Examples and Comparative Examples below are 0.1 nm/sec unless otherwise indicated.
- the deposition rates were measured using a quartz crystal oscillator. Further, the thickness of each of the layers below was measured using the quartz crystal oscillator.
- HAT-CN Film thickness of 10 nm
- Second layer HT-2: Film thickness of 30 nm
- ET-1 Film thickness of 30 nm
- a patterned mask (mask having a light emitting area of 2 mm ⁇ 2 mm) was placed on the layer of lithium. fluoride, and the metallic aluminum was deposited.
- the obtained laminate was put in a glove box purged with a nitrogen gas without bringing it into contact with the atmosphere and then sealed with a sealing can made of glass and an ultraviolet ray-curable adhesive (XNR5516HV, manufactured by Nagase-Chiba, Ltd.), thereby obtaining organic electroluminescent elements 1-1 to 1-5, and comparative organic electroluminescent elements 1-1 to 1-3, each having a light emitting area in a 2 mm ⁇ 2 mm square. Light emission derived from the light emitting material was observed in each of the elements. For each of the obtained organic electroluminescent elements, the following tests were carried out. The results of the evaluation from the viewpoints of the luminous efficiency (external quantum efficiency) and the chromaticity are shown in Table 3 below.
- Light was emitted by applying a direct current voltage to each of the elements by using a source measure unit 2400 manufactured by Keithley Instruments Inc., and the luminance was measured using a luminance meter (BM-8 manufactured by Topcon Corporation).
- the luminous spectrum and the light emitting wavelength were measured using a spectrum analyzer (PMA-11 manufactured by Hamamatsu Photonics K. K.). Based on these values, the external quantum efficiency ( ⁇ ) at a luminance in the vicinity of 1,000 cd/m 2 was calculated by using a luminance conversion method, and is expressed as a relative value, taking the value of the organic electroluminescent element 1-1 using the light emitting material 1 as 1.0. Larger numeral values are preferable because larger numeral values indicate better efficiency.
- the chromaticity (x, y) was determined. From the y values at that time, the chromaticity was evaluated as the following 3 grades.
- Organic electroluminescent elements 2-1 to 2-5 and comparative elements 2-1 to 2-3 were fabricated in the same manner as in Example 2, except that the layer configurations were changed as follows, and evaluations were carried out in the same manner as in Example 2. The results are shown in Table 4 below. Further, the external quantum efficiency in Table 4 below is expressed as a relative value, taking the value of the organic electroluminescent element 2-1 using the light emitting material 1 as 1.0.
- HT-4 Film thickness of 50 nm
- Second layer HT-3: Film thickness of 45 nm
- ET-3 Film thickness of 20 nm
- Organic electroluminescent elements 3-1 to 3-5 and comparative elements 3-1 to 3-3 were fabricated in the same manner as in Example 2, except that the layer configurations were changed as follows, and evaluations were carried out in the same manner as in Example 2. The results are shown in Table 5 below. Further, the external quantum efficiency in Table 5 below is expressed as a relative value, taking the value of the organic electroluminescent element 3-1 using the light emitting material 1 as 1.0.
- HAT-CN Film thickness of 10 nm
- Second layer HT-2: Film thickness of 30 nm
- ET-4 Film thickness of 30 nm
- Organic electroluminescent elements 4-1 to 4-6 and comparative elements 3-1 to 3-3 were fabricated in the same manner as in Example 2, except that the layer configurations were changed as follows, and evaluations were carried out in the same manner as in Example 2. The results are shown in Table 6 below. Further, the external quantum efficiency in Table 6 below is expressed as a relative value, taking the value of the organic electroluminescent element 4-1 using the light emitting material 1 as 1.0.
- HAT-CN Film thickness of 10 nm
- Second layer HT-1: Film thickness of 30 nm
- ET-4 Film thickness of 30 nm
- Organic electroluminescent elements 5-1 to 5-5 and comparative elements 5-1 to 5-3 were fabricated in the same manner as in Example 2, except that the layer configurations were changed as follows, and evaluations were carried out in the same manner as in Example 2. The results are shown in Table 7 below. Further, the external quantum efficiency in Table 7 below is expressed as a relative value, taking the value of the organic electroluminescent element 5-1 using the light emitting material 1 as 1.0.
- HAT-CN Film thickness of 10 nm
- Second layer HT-2: Film thickness of 30 nm
- ET-2 Film thickness of 30 nm
- the light emitting material 1 (0.1% by mass) and a host material PH-1 having the following structure (0.9% by mass) were mixed with methyl ethyl ketone (98.99% by mass) to obtain a light emitting layer-forming coating liquid 1.
- ITO was deposited on a 25 mm ⁇ 25 mm ⁇ 0.7 mm glass substrate to give a thickness of 150 nm, thereby forming a film, which was taken as a transparent supporting substrate. This transparent supporting substrate was etched and washed.
- the light emitting layer-forming coating liquid 1 was spin-coated on the hole injecting layer (1,300 rpm for 30 seconds) to give a thickness of about 40 nm, thereby obtaining a light emitting layer.
- BAlq bis-(2-methyl-8-quinolinolato)-4-(phenylphenolato)-aluminum(III) represented by the following structural formula was formed as an electron transporting layer on the light emitting layer to give a thickness of 40 nm by a vacuum deposition method.
- Lithium fluoride LiF was formed as an electron injecting layer on an electron transporting layer to give a thickness of 1 nm by a vacuum deposition method.
- Metal aluminum was further deposited to 70 nm thereon to from a cathode.
- the laminate thus prepared was put into a glove box purged with an argon gas, and then sealed with a sealing can made of stainless steel and an ultraviolet-curable adhesive (XNR5516HV, manufactured by Nagase-Chiba, Ltd.) to fabricate an organic electroluminescent element 6-1.
- a sealing can made of stainless steel and an ultraviolet-curable adhesive XNR5516HV, manufactured by Nagase-Chiba, Ltd.
- organic electroluminescent elements 6-2 to 6-6 were prepared, respectively.
- organic electroluminescent elements 6-7 and 6-8 were prepared, respectively.
- the organic electroluminescent element of the present invention using the luminescent compound of the present invention has high luminous efficiency and excellent chromaticity.
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CN113816861B (zh) * | 2020-06-19 | 2024-01-30 | 广州华睿光电材料有限公司 | 芳香胺化合物、混合物、组合物及有机电子器件 |
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2012
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- 2012-10-05 TW TW101136898A patent/TWI557211B/zh active
- 2012-10-05 US US14/349,938 patent/US20150084016A1/en not_active Abandoned
- 2012-10-05 WO PCT/IB2012/001973 patent/WO2013050862A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
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TWI557211B (zh) | 2016-11-11 |
JP2013084732A (ja) | 2013-05-09 |
TWI600745B (zh) | 2017-10-01 |
TW201331337A (zh) | 2013-08-01 |
US11744144B2 (en) | 2023-08-29 |
US20190259955A1 (en) | 2019-08-22 |
WO2013050862A1 (ja) | 2013-04-11 |
TW201639946A (zh) | 2016-11-16 |
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