KR20190113661A - Compound and organic light emitting device comprising the same - Google Patents

Abstract

The present specification provides a compound represented by chemical formula 1 and an organic light emitting device comprising the same. The compound according to an embodiment of the present specification can be used as a material of an organic material layer of the organic light emitting device, and by using the same, it is possible to improve efficiency, lower driving voltage, and improve lifespan characteristics in the organic light emitting device.

Description

COMPOUND AND ORGANIC LIGHT EMITTING DEVICE COMPRISING THE SAME

The present specification relates to a compound and an organic light emitting device including the same.

This specification claims the benefit of the filing date of Korean Patent Application No. 10-2018-0035819 filed with the Korea Intellectual Property Office on March 28, 2018, the entire contents of which are incorporated herein.

In general, organic light emitting phenomenon refers to a phenomenon of converting electrical energy into light energy using an organic material. An organic light emitting device using an organic light emitting phenomenon usually has a structure including an anode, a cathode, and an organic material layer therebetween. The organic material layer is often made of a multi-layered structure composed of different materials to increase the efficiency and stability of the organic light emitting device, for example, it may be made of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer. When the voltage is applied between the two electrodes in the structure of the organic light emitting device, holes are injected into the organic material layer at the anode and electrons are injected into the organic material layer, and excitons are formed when the injected holes and the electrons meet each other. When it falls back to the ground, it glows.

There is a continuing need for the development of new materials for such organic light emitting devices.

US Patent Application Publication No. 2004-0251816

The present specification provides a compound and an organic light emitting device including the same.

According to an exemplary embodiment of the present specification to provide a compound represented by the formula (1).

[Formula 1]

In Chemical Formula 1,

X1 and X2 are the same as or different from each other, and each independently a direct bond; O; S or CRR ',

Y1 and Y2 are the same as or different from each other, and each independently NRa; S or CRbRc, n1 and n2 are each 0 or 1,

Ar1 and Ar2 are the same as or different from each other, and each independently a substituted or unsubstituted aryl group; Or a substituted or unsubstituted heteroaryl group,

R1 to R6, Ra to Rc, R and R 'are the same as or different from each other, and each independently hydrogen; heavy hydrogen; Nitrile group; Substituted or unsubstituted alkyl group; A substituted or unsubstituted cycloalkyl group; Substituted or unsubstituted alkoxy group; Substituted or unsubstituted aryloxy group; Substituted or unsubstituted alkenyl group; Substituted or unsubstituted silyl group; Substituted or unsubstituted amine group; Substituted or unsubstituted aryl group; Or a substituted or unsubstituted heteroaryl group,

a to d are each an integer of 0 to 4, e and f are each an integer of 0 to 4, e + n1 is 3 or less, f + n2 is 3 or less, and in parentheses when a to f are plural. The substituents are the same or different from each other.

Further, according to one embodiment of the present specification, the first electrode; A second electrode provided to face the first electrode; And at least one organic material layer provided between the first electrode and the second electrode, wherein at least one of the organic material layers includes a compound represented by Chemical Formula 1. .

The compound according to the exemplary embodiment of the present specification may be used as a material of the organic material layer of the organic light emitting device, and by using the compound, it is possible to improve efficiency, low driving voltage, and / or lifespan characteristics in the organic light emitting device.

1 illustrates an organic light emitting device according to an exemplary embodiment of the present specification.
2 and 3 illustrate an organic light emitting device according to another embodiment of the present specification.

Hereinafter, this specification is demonstrated in detail.

An exemplary embodiment of the present specification provides a compound represented by Chemical Formula 1.

Compound of Formula 1 according to an exemplary embodiment of the present specification may have a delayed fluorescent characteristic of less than ΔEst 0.2eV. [Delta] Est is a value obtained by measuring the energy of the singlet and triplet, respectively, and the difference, and the energy values of the singlet and triplet can be measured using a fluorescent device. The reason for the delayed fluorescence is that the energy distribution of the highest occupied molecular orbital (HOMO) and lower unoccupied molecular orbital (LUMO) of the molecule is separated, and the reverse intersystem crossing due to the small energy difference between the singlet and triplet. This is because exciton shift from triplet to singlet occurs.

In the present specification, when a part "includes" a certain component, this means that it may further include other components, without excluding other components unless specifically stated otherwise.

As used herein, when a member is located "on" another member, this includes not only when one member is in contact with another member but also when another member exists between the two members.

Examples of substituents in the present specification are described below, but are not limited thereto.

The term "substituted" means that a hydrogen atom bonded to a carbon atom of the compound is replaced with another substituent, and the position to be substituted is not limited to a position where the hydrogen atom is substituted, that is, a position where a substituent can be substituted, if two or more substituted , Two or more substituents may be the same or different from each other.

As used herein, the term "substituted or unsubstituted" is hydrogen; heavy hydrogen; Nitrile group; Substituted or unsubstituted alkyl group; A substituted or unsubstituted cycloalkyl group; Substituted or unsubstituted alkoxy group; Substituted or unsubstituted aryloxy group; Substituted or unsubstituted alkenyl group; Substituted or unsubstituted silyl group; Substituted or unsubstituted boron group; Substituted or unsubstituted amine group; Substituted or unsubstituted aryl group; And it is substituted with one or two or more substituents selected from the group consisting of a substituted or unsubstituted heterocyclic group, or two or more of the substituents exemplified above are substituted with a substituent, or means that do not have any substituents. For example, "a substituent to which two or more substituents are linked" may be an aryl group substituted with an aryl group, an aryl group substituted with a heteroaryl group, a heterocyclic group substituted with an aryl group, an aryl group substituted with an alkyl group, or the like.

In the present specification, the alkyl group may be linear or branched chain, carbon number is not particularly limited, but is preferably 1 to 30. Specific examples include methyl, ethyl, propyl, n-propyl, isopropyl, butyl, n-butyl, isobutyl, tert-butyl, sec-butyl, 1-methyl-butyl, 1-ethyl-butyl, pentyl, n-pentyl , Isopentyl, neopentyl, tert-pentyl, hexyl, n-hexyl, 1-methylpentyl, 2-methylpentyl, 4-methyl-2-pentyl, 3,3-dimethylbutyl, 2-ethylbutyl, heptyl, n -Heptyl, 1-methylhexyl, cyclopentylmethyl, cyclohexylmethyl, octyl, n-octyl, tert-octyl, 1-methylheptyl, 2-ethylhexyl, 2-propylpentyl, n-nonyl, 2,2-dimethyl Heptyl, 1-ethyl-propyl, 1,1-dimethyl-propyl, isohexyl, 2-methylpentyl, 4-methylhexyl, 5-methylhexyl, and the like, but is not limited thereto.

In the present specification, the cycloalkyl group is not particularly limited, but preferably has 3 to 30 carbon atoms, specifically, cyclopropyl, cyclobutyl, cyclopentyl, 3-methylcyclopentyl, 2,3-dimethylcyclopentyl, cyclohexyl, 3-methylcyclohexyl, 4-methylcyclohexyl, 2,3-dimethylcyclohexyl, 3,4,5-trimethylcyclohexyl, 4-tert-butylcyclohexyl, cycloheptyl, cyclooctyl, and the like, but are not limited thereto. It is not.

In the present specification, the alkoxy group may be linear, branched or cyclic. Although carbon number of an alkoxy group is not specifically limited, It is preferable that it is C1-C30. Specifically, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, tert-butoxy, sec-butoxy, n-pentyloxy, neopentyloxy, isopentyloxy, n -Hexyloxy, 3,3-dimethylbutyloxy, 2-ethylbutyloxy, n-octyloxy, n-nonyloxy, n-decyloxy, benzyloxy, p-methylbenzyloxy, and the like. It is not limited.

In the present specification, the amine group is -NH ₂ ; Alkylamine group; N-alkylarylamine group; Arylamine group; N-aryl heteroaryl amine group; It may be selected from the group consisting of an N-alkylheteroarylamine group and a heteroarylamine group, carbon number is not particularly limited, but is preferably 1 to 30. Specific examples of the amine group include methylamine group, dimethylamine group, ethylamine group, diethylamine group, phenylamine group, naphthylamine group, biphenylamine group, anthracenylamine group, and 9-methyl-anthracenylamine group. A diphenylamine group, an N-phenylnaphthylamine group, a tolylamine group, an N-phenyltolylamine group, a triphenylamine group, and an N-phenylbiphenylamine group; N-phenylnaphthylamine group; N-biphenyl naphthylamine group; N-naphthylfluorenylamine group; N-phenylphenanthrenylamine group; N-biphenylphenanthrenylamine group; N-phenyl fluorenyl amine group; N-phenylterphenylamine group; N-phenanthrenyl fluorenyl amine group; N-biphenyl fluorenyl amine group and the like, but is not limited thereto.

In the present specification, the arylamine group refers to an amine group substituted with one or two aryl groups as an amine group in which an aryl group is substituted with N of the amine group. The arylamine group may be represented by -NRR ', at least one of R and R' may be an aryl group, and the rest may be hydrogen, an alkyl group or an aryl group. Here, the alkyl group and the aryl group may be those exemplified herein.

In the present specification, the N-alkylarylamine group means an amine group in which an alkyl group and an aryl group are substituted for N of the amine group.

In the present specification, the N-arylheteroarylamine group means an amine group in which an aryl group and a heteroaryl group are substituted for N in the amine group.

In the present specification, the N-alkylheteroarylamine group means an amine group in which an alkyl group and a heteroarylamine group are substituted for N of the amine group.

In the present specification, the alkyl group in the alkylamine group, the N-arylalkylamine group, the alkylthioxy group, the alkyl sulfoxy group, and the N-alkylheteroarylamine group is the same as the example of the alkyl group described above.

In the present specification, the alkenyl group may be linear or branched chain, carbon number is not particularly limited, but is preferably 2 to 30. Specific examples include vinyl, 1-propenyl, isopropenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 3-methyl-1- Butenyl, 1,3-butadienyl, allyl, 1-phenylvinyl-1-yl, 2-phenylvinyl-1-yl, 2,2-diphenylvinyl-1-yl, 2-phenyl-2- ( Naphthyl-1-yl) vinyl-1-yl, 2,2-bis (diphenyl-1-yl) vinyl-1-yl, stilbenyl group, styrenyl group, and the like, but are not limited thereto.

In the present specification, specifically, the silyl group includes trimethylsilyl group, triethylsilyl group, t-butyldimethylsilyl group, vinyldimethylsilyl group, propyldimethylsilyl group, triphenylsilyl group, diphenylsilyl group, phenylsilyl group, and the like. However, the present invention is not limited thereto.

In the present specification, the aryl group is not particularly limited, but preferably has 6 to 30 carbon atoms, and the aryl group may be monocyclic or polycyclic.

When the aryl group is a monocyclic aryl group, carbon number is not particularly limited, but is preferably 6 to 30 carbon atoms. Specifically, the monocyclic aryl group may be a phenyl group, a biphenyl group, a terphenyl group, etc., but is not limited thereto.

Carbon number is not particularly limited when the aryl group is a polycyclic aryl group. It is preferable that it is C10-30. Specifically, the polycyclic aryl group may be a naphthyl group, anthracenyl group, phenanthryl group, triphenyl group, pyrenyl group, penalenyl group, perrylenyl group, chrysenyl group, fluorenyl group, etc., but is not limited thereto. no.

In the present specification, the fluorenyl group may be substituted, and adjacent groups may combine with each other to form a ring.

,

,

,

,

및

등이 될 수 있다. 다만, 이에 한정되는 것은 아니다.When the fluorenyl group is substituted,

,

,

,

,

And

And so on. However, the present invention is not limited thereto.

In the present specification, the aryl group in the aryloxy group, the N-arylalkylamine group, and the N-arylheteroarylamine group is the same as the aryl group described above. Specifically, the aryloxy group may be a phenoxy group, p-tolyloxy group, m-tolyloxy group, 3,5-dimethyl-phenoxy group, 2,4,6-trimethylphenoxy group, p-tert-butylphenoxy group, 3- Biphenyloxy group, 4-biphenyloxy group, 1-naphthyloxy group, 2-naphthyloxy group, 4-methyl-1-naphthyloxy group, 5-methyl-2-naphthyloxy group, 1-anthryloxy group , 2-anthryloxy group, 9-anthryloxy group, 1-phenanthryloxy group, 3-phenanthryloxy group, 9-phenanthryloxy group, and the like.

In the present specification, the heteroaryl group includes one or more atoms other than carbon and heteroatoms, and specifically, the heteroatoms may include one or more atoms selected from the group consisting of O, N, Se, and S, and the like. Although carbon number is not particularly limited, it is preferably 2 to 30 carbon atoms, the heteroaryl group may be monocyclic or polycyclic. Examples of the heterocyclic group are thiophene group, furan group, pyrrole group, imidazole group, thiazole group, oxazole group, oxadiazole group, pyridyl group, bipyridyl group, pyrimidyl group, triazinyl group, triazole group, acri Dill group, pyridazinyl group, pyrazinyl group, quinolinyl group, quinazolinyl group, quinoxalinyl group, phthalazinyl group, pyrido pyrimidyl group, pyrido pyrazinyl group, pyrazino pyrazinyl group, isoquinolinyl group , Indolyl group, carbazole group, benzoxazole group, benzoimidazole group, benzothiazole group, benzocarbazole group, dibenzopyrrole group, indole group, benzothiophene group, dibenzothiophene group, benzofuran group, benzoquinolyl group; Benzonaphthothiophene group, benzonaphthofuran group, phenanthrolinyl group, phenanthroline, thiazole group, isoxazole group, oxadiazole group, thiadiazole group, benzothiazole group, phenoxazine group, phenothiazine group, dibenzofuran group, etc. There is, but is not limited to this.

In the present specification, examples of the heteroarylamine group include a substituted or unsubstituted monoheteroarylamine group, a substituted or unsubstituted diheteroarylamine group, or a substituted or unsubstituted triheteroarylamine group. The heteroarylamine group including two or more heteroaryl groups may simultaneously include a monocyclic heteroaryl group, a polycyclic heteroaryl group, or a monocyclic heteroaryl group and a polycyclic heteroaryl group. For example, the heteroaryl group in the heteroarylamine group may be selected from the examples of the heteroaryl group described above.

According to an exemplary embodiment of the present specification, Ar1 and Ar2 are the same as or different from each other, and each independently a substituted or unsubstituted C6-C12 aryl group; Or a substituted or unsubstituted C2-C12 heteroaryl group.

According to an exemplary embodiment of the present specification, Ar1 and Ar2 are the same as or different from each other, and each independently a C6-C12 aryl group unsubstituted or substituted with an alkyl group, an aryl group, or a heteroaryl group; Or a C2-C12 heteroaryl group unsubstituted or substituted with an alkyl group, an aryl group or a heteroaryl group.

According to an exemplary embodiment of the present specification, Ar1 and Ar2 are the same as or different from each other, a substituted or unsubstituted phenyl group; A substituted or unsubstituted biphenyl group; Substituted or unsubstituted naphthyl group; A substituted or unsubstituted fluorenyl group; Substituted or unsubstituted dibenzofuran group; Or a substituted or unsubstituted dibenzothiophene group.

According to an exemplary embodiment of the present specification, Ar1 and Ar2 are the same as or different from each other, an phenyl group unsubstituted or substituted with an alkyl group or an aryl group; A biphenyl group unsubstituted or substituted with an alkyl group or an aryl group; A naphthyl group unsubstituted or substituted with an alkyl group or an aryl group; A fluorenyl group unsubstituted or substituted with an alkyl group or an aryl group; A dibenzofuran group unsubstituted or substituted with an alkyl group or an aryl group; Or a dibenzothiophene group unsubstituted or substituted with an alkyl group or an aryl group.

According to an exemplary embodiment of the present specification, Ar1 and Ar2 are the same as or different from each other, and a phenyl group unsubstituted or substituted with a methyl group or a phenyl group; A biphenyl group unsubstituted or substituted with a methyl group or a phenyl group; A naphthyl group unsubstituted or substituted with a methyl group or a phenyl group; A fluorenyl group unsubstituted or substituted with a methyl group or a phenyl group; A dibenzofuran group unsubstituted or substituted with a methyl group or a phenyl group; Or a dibenzothiophene group unsubstituted or substituted with a methyl group or a phenyl group.

According to an exemplary embodiment of the present specification, Ar1 and Ar2 are the same as or different from each other, and a phenyl group; Biphenyl group; Naphthyl group; Fluorenyl group substituted with a methyl group; Dibenzofuran group; Or a dibenzothiophene group.

According to an exemplary embodiment of the present specification, X1 and X2 are a direct bond.

According to an exemplary embodiment of the present specification, one of the X1 and X2 is a direct bond, the other is O, S or CRR '.

According to an exemplary embodiment of the present specification, X1 and X2 are each O, S or CRR '.

According to an exemplary embodiment of the present specification, Y1 and Y2 are the same as each other, NRa; S or CRbRc.

According to an exemplary embodiment of the present specification, R and R 'is an alkyl group.

According to an exemplary embodiment of the present specification, R and R 'is a methyl group.

According to an exemplary embodiment of the present specification, Rb and Rc is an alkyl group.

According to an exemplary embodiment of the present specification, Rb and Rc is a methyl group.

According to an exemplary embodiment of the present specification, Ra is a substituted or unsubstituted aryl group; Or a substituted or unsubstituted heteroaryl group.

According to an exemplary embodiment of the present specification, Ra is a substituted or unsubstituted C6-C12 aryl group; Or a substituted or unsubstituted C2-C12 heteroaryl group.

According to an exemplary embodiment of the present specification, Ra is a C6-C12 aryl group unsubstituted or substituted with an alkyl group, an aryl group or a heteroaryl group; Or a C2-C12 heteroaryl group unsubstituted or substituted with an alkyl group, an aryl group or a heteroaryl group.

According to an exemplary embodiment of the present specification, Ra is a C6-C12 aryl group unsubstituted or substituted with an alkyl group, an aryl group or a heteroaryl group.

According to an exemplary embodiment of the present specification, Ra is a substituted or unsubstituted phenyl group; A substituted or unsubstituted biphenyl group; Or a substituted or unsubstituted naphthyl group.

According to an exemplary embodiment of the present specification, Ra is a phenyl group unsubstituted or substituted with an alkyl group, an aryl group or a heteroaryl group; A biphenyl group unsubstituted or substituted with an alkyl group, an aryl group or a heteroaryl group; Or a naphthyl group unsubstituted or substituted with an alkyl group, an aryl group, or a heteroaryl group.

According to an exemplary embodiment of the present specification, Ra is a phenyl group unsubstituted or substituted with an alkyl group, an aryl group or a heteroaryl group.

According to an exemplary embodiment of the present specification, Ra is a phenyl group.

According to an exemplary embodiment of the present disclosure, n1 and n2 is 0.

According to an exemplary embodiment of the present specification, at least one of n1 and n2 is 1.

According to an exemplary embodiment of the present disclosure, n1 and n2 are each one.

In the present invention, when at least one of n1 and n2 is 1, an additional condensed ring is bonded to the tricyclic ring of Formula 1 to improve the electron acceptability of the compound. In addition, the compound to which the additional condensed ring is bonded is advantageous in that it is excellent in heat resistance and can maintain an appropriate deposition temperature in fabricating an organic light emitting device. In addition, there is an advantage in reducing the contamination of the deposition device for deposition and the organic light emitting device when manufacturing the organic light emitting device.

According to an exemplary embodiment of the present specification, Formula 1 is selected from the following formula.

[Formula 2]

[Formula 3]

[Formula 4]

[Formula 5]

[Formula 6]

[Formula 7]

[Formula 8]

[Formula 9]

[Formula 10]

[Formula 11]

[Formula 12]

[Formula 13]

[Formula 14]

[Formula 15]

In Formulas 2 to 15, the substituent definition is as described above.

In one embodiment of the present specification, in Chemical Formula 2, a, b, e, and f are integers of 0 to 3.

In one embodiment of the present specification, in Chemical Formula 2, a, b, e, and f are integers of 0 to 2.

In one embodiment of the present specification, in the general formula 2, R1, R2, R5 and R6 are the same as or different from each other, and each independently hydrogen; Substituted or unsubstituted alkyl group; Or a substituted or unsubstituted aryl group.

In one embodiment of the present specification, in the general formula 2, R1, R2, R5 and R6 are the same as or different from each other, and each independently hydrogen; Or a substituted or unsubstituted alkyl group.

In one embodiment of the present specification, in the general formula 2, R1, R2, R5 and R6 are the same as or different from each other, and each independently hydrogen; Or an alkyl group

In one embodiment of the present specification, in the general formula 2, R1, R2, R5 and R6 are the same as or different from each other, and each independently hydrogen; Or an alkyl group having 1 to 10 carbon atoms

In one embodiment of the present specification, in the general formula 2, R1, R2, R5 and R6 are the same as or different from each other, and each independently hydrogen; Methyl group; Ethyl group; Butyl group; Or profile

In one embodiment of the present specification, in Chemical Formulas 3 to 7, a, e, and c are 0, and b and f are integers of 0 to 3.

In one embodiment of the present specification, in Chemical Formulas 3 to 7, a, e, and c are 0, and b and f are integers of 0 to 2.

In one embodiment of the present specification, in the above Chemical Formulas 3 to 7, R2 and R6 are the same as or different from each other, and each independently hydrogen; Substituted or unsubstituted alkyl group; Or a substituted or unsubstituted aryl group.

In one embodiment of the present specification, in the above Chemical Formulas 3 to 7, R2 and R6 are the same as or different from each other, and each independently hydrogen; Or a substituted or unsubstituted alkyl group.

In one embodiment of the present specification, in the above Chemical Formulas 3 to 7, R2 and R6 are the same as or different from each other, and each independently hydrogen; Or an alkyl group

In one embodiment of the present specification, in the above Chemical Formulas 3 to 7, R2 and R6 are the same as or different from each other, and each independently hydrogen; Or an alkyl group having 1 to 10 carbon atoms

In one embodiment of the present specification, in the above Chemical Formulas 3 to 7, R2 and R6 are the same as or different from each other, and each independently hydrogen; Methyl group; Ethyl group; Butyl group; Or profile

In one embodiment of the present specification, in Chemical Formulas 8 to 11, a and e are integers of 0 to 3, and b, d and f are 0.

In one embodiment of the present specification, in Chemical Formulas 8 to 11, a and e are integers of 0 to 2, and b, d and f are 0.

In one embodiment of the present specification, in the above Formulas 8 to 11, R1 and R5 are the same as or different from each other, and each independently hydrogen; Substituted or unsubstituted alkyl group; Or a substituted or unsubstituted aryl group.

In one embodiment of the present specification, in the above Formulas 8 to 11, R1 and R5 are the same as or different from each other, and each independently hydrogen; Or a substituted or unsubstituted alkyl group.

In one embodiment of the present specification, in the above Formulas 8 to 11, R1 and R5 are the same as or different from each other, and each independently hydrogen; Or an alkyl group

In one embodiment of the present specification, in the above Formulas 8 to 11, R1 and R5 are the same as or different from each other, and each independently hydrogen; Or an alkyl group having 1 to 10 carbon atoms

In one embodiment of the present specification, in the above Formulas 8 to 11, R1 and R5 are the same as or different from each other, and each independently hydrogen; Methyl group; Ethyl group; Butyl group; Or profile

In one embodiment of the present specification, in Chemical Formulas 12 to 15, a to f are 0.

According to an exemplary embodiment of the present specification, Formula 1 is any one of the following compounds.

According to an exemplary embodiment of the present specification, the triplet energy level of the compound represented by Formula 1 is 2.1 eV or more and 2.5 eV or less, preferably 2.3 eV or more and 2.4 eV or less. When the triplet energy level of the compound represented by Chemical Formula 1 satisfies the above range, electron injection is facilitated to increase the formation rate of the exciton, thereby increasing the luminous efficiency.

According to an exemplary embodiment of the present specification, the difference between the singlet energy level and triplet energy level of the compound represented by Formula 1 is 0 eV or more and 0.3 eV or less, preferably 0 eV or more and 0.2 eV. It is as follows. When the difference between the singlet energy level and triplet energy level of the compound represented by Formula 1 satisfies the above range, the excitons generated in the triplet are converted into singlet by the reverse interphase transition (RISC). Since the exciton stays in the triplet is reduced by increasing the rate and speed of the movement, there is an advantage that the efficiency and life of the organic light emitting device is increased.

In the present specification, the triplet energy can be measured using a spectroscopic device capable of measuring fluorescence and phosphorescence, and in the case of measurement conditions, at a concentration of 10 ^-6 M using toluene or TF as a solvent in a cryogenic state using liquid nitrogen. A solution is prepared and irradiated with a light source in the absorption wavelength range of the material, and the spectrum emitted from the triplet is identified by excluding the singlet emission. When the electron is reversed from the light source, the time that the electron stays in the triplet is much longer than the time that the electron stays in the singlet, so that the two components can be separated in the cryogenic state.

In the present specification, the singlet energy is measured using a fluorescent device, and unlike the aforementioned triplet energy measuring method, the light source is irradiated at room temperature.

In the present specification, compounds having various energy band gaps may be synthesized by introducing various substituents into the core structure of the compound represented by Chemical Formula 1. In addition, in the present specification, the HOMO and LUMO energy levels of the compound may also be adjusted by introducing various substituents into the core structure of the above structure.

The calculated values of HOMO, LUMO, triplet energy and singlet energy in the present specification can be measured by the following method.

1) Measurement of HOMO and LUMO Energy Levels

HOMO energy level of the compound and the LUMO energy level is a cyclic voltage comparing the oxidation and reduction potential of the dimethylformamide (DMF) solution in which the measured compound is dissolved at a concentration of 5 mM and the electrolyte is 0.1M. It was measured by cyclic voltammetry (CV). Specific measurement conditions are as follows.

CV device: Iviumstat from Ivium Tech

Measuring solution: Dimethylformamide (DMF) solution in which the measuring compound was dissolved at a concentration of 5 mM and an electrolyte (KNO ₃ , Aldrich) at a concentration of 0.1 M

Working Electrode: Carbon Electrode

Reference Electorde: Al / AgCl Electrode

Counter Electrode: Platinum Electrode

Measuring temperature: 25 ℃

Scan rate: 50mV / S

HOMO energy level (E (HOMO)) and LUMO energy level (E (LUMO)) can be calculated through the following equation.

E (HOMO) = (V _solvent- (E _{onset ox} -E _1/2 (solvent)) eV

E (LUMO) = (V _solvent- (E _{onset red} -E _1/2 (solvent)) eV

In the above formula, V _solvent is the energy level of the solvent, E _1/2 (solvent) is the half wave level of the solvent, E _{onset ox} is the point where the oxidation starts, E _{onset red} is the point where the reduction begins.

2) Measurement of triplet energy

Triplet energy (T1) was measured at cryogenic conditions using the properties of triplet excitons, which have long lifespan. Specifically, after dissolving the compound in toluene solvent to prepare a sample having a concentration of 10 ^-5 M, the sample is put in a quartz kit and cooled to 77K, and the 300 nm light source is irradiated to the sample for measuring phosphorescence while changing the wavelength The spectrum can be measured. A spectrophotometer (FP-8600 spectrophotometer, JASCO) can be used for the measurement of a spectrum.

The vertical axis of the phosphorescence spectrum is phosphorescence intensity and the horizontal axis is wavelength. A tangent line was drawn for the rise of the short wavelength side of the phosphorescence spectrum, and the wavelength value (λ _edge1 (nm)) of the intersection point of the tangent line and the horizontal axis was obtained, and the wavelength value was substituted into the following equation 1 to calculate the triplet energy. .

Conversion formula (F1): T1 (eV) = 1239.85 / λ _edge1

The tangent to the rise of the short wavelength side of the phosphorescence spectrum is drawn as follows. First, the maximum value of the shortest wavelength side of the maximum value of a spectrum is confirmed. At this time, the maximum point which has the peak intensity of 15% or less of the maximum peak intensity of a spectrum is not included in the maximum value of the shortest wavelength side mentioned above. The tangent line at each point on the spectral curve from the short wavelength side of the phosphorescence spectrum to the maximum value is considered. Of these tangent lines, the tangent line having the largest slope value (that is, the tangent line at the inflection point) is a tangent line to the rise of the short wavelength side of the phosphorescence spectrum.

3) Measurement of singlet energy

Singlet energy (S1) can be measured by the following method.

A 10 ^-5 M toluene solution of the compound to be measured was prepared, placed in a quartz cell, and the emission spectrum (vertical axis: light emission intensity, horizontal axis: wavelength) of the 300 nm light source of the sample was measured at room temperature (300 K). A tangent line is drawn for the rise of the short wavelength side of the emission spectrum, and the singlet energy is calculated by substituting the wavelength value (λ _edge2 (nm)) of the intersection point of the tangent line and the horizontal axis in the following Equation 2. The emission spectrum can be measured using a spectrophotometer (FP-8600 spectrophotometer) of JASCO.

Conversion formula 2: S1 (eV) = 1239.85 / λ _edge2

The tangent to the rise of the short wavelength side of the emission spectrum is drawn as follows. First, the maximum value of the shortest wavelength side of the maximum value of a spectrum is confirmed. The tangent line at each point on the spectral curve from the short wavelength side of the emission spectrum to the maximum value is considered. Of these tangent lines, the tangent line having the largest slope value (that is, the tangent line at the inflection point) is a tangent line to the rise of the short wavelength side of the emission spectrum. The maximum point which has the peak intensity of 15% or less of the maximum peak intensity of a spectrum is not included in the maximum value of the shortest wavelength side mentioned above.

According to an exemplary embodiment of the present specification, the first electrode; A second electrode provided to face the first electrode; And at least one organic material layer provided between the first electrode and the second electrode, wherein at least one of the organic material layers includes the compound described above.

According to an exemplary embodiment of the present specification, the organic material layer of the organic light emitting device of the present specification may be formed of a single layer structure, but may be formed of a multilayer structure in which two or more organic material layers are stacked. For example, the organic light emitting device of the present invention may have a structure including a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, an electron electron injection layer as an organic material layer. However, the structure of the organic light emitting device is not limited thereto and may include fewer or more organic layers.

For example, the structure of the organic light emitting device of the present specification may have a structure as shown in FIGS. 1 and 2, but is not limited thereto.

1 illustrates a structure of an organic light emitting device in which a first electrode 2, a light emitting layer 3, and a second electrode 4 are sequentially stacked on a substrate 1. 1 is an exemplary structure of an organic light emitting device according to an exemplary embodiment of the present specification, and may further include another organic material layer.

In FIG. 2, a first electrode 2, a hole injection layer 5, a hole transport layer 6, a light emitting layer 3, an electron transport layer 7, and a second electrode 4 are sequentially stacked on the substrate 1. The structure of the organic light emitting element is illustrated. 2 is an exemplary structure according to an exemplary embodiment of the present specification, and may further include another organic material layer.

3 shows a first electrode 2, a hole injection layer 5, a hole transport layer 6, an electron blocking layer 8, a light emitting layer 3, a hole blocking layer 9, an electron injection and the like on a substrate 1. The structure of the organic light emitting device in which the transport layer 10 and the second electrode 4 are sequentially stacked is illustrated. 3 is an exemplary structure according to an exemplary embodiment of the present specification, and may further include or omit another organic material layer.

According to the exemplary embodiment of the present specification, the organic material layer includes a hole injection layer, a hole transport layer or an electron blocking layer, and the hole injection layer, the hole transport layer or the electron blocking layer includes the compound represented by Chemical Formula 1.

According to an exemplary embodiment of the present specification, the organic material layer includes a light emitting layer, and the light emitting layer includes a compound represented by Chemical Formula 1.

According to an exemplary embodiment of the present specification, the thickness of the light emitting layer is 200 kPa to 400 kPa.

According to an exemplary embodiment of the present specification, the thickness of the light emitting layer is 300 kPa.

According to an exemplary embodiment of the present specification, the organic material layer includes a light emitting layer, and the light emitting layer includes the compound represented by Formula 1 as a dopant of the light emitting layer. In this case, the dopant may be used in an amount of 0.001% to 50% by weight based on the total weight of the light emitting layer.

According to an exemplary embodiment of the present specification, the organic material layer includes a light emitting layer, and the light emitting layer includes the compound represented by Chemical Formula 1 as a matrix of the light emitting layer. In this case, the dopant may be used in an amount of 0.001% to 50% by weight based on the total weight of the light emitting layer.

When the compound of Formula 1 is used as a dopant of the light emitting layer, one or more of the following compounds may be used together.

According to an exemplary embodiment of the present specification, the organic material layer includes a light emitting layer, and the light emitting layer may include the compound as an auxiliary dopant or sensitizer of the light emitting layer.

According to another exemplary embodiment, the organic material layer includes a light emitting layer, the light emitting layer includes the compound, and may further include a host and a fluorescent dopant. In this case, the compound serves as an assistant dopant or a sensitizer. Specifically, the compound receives excipients from holes and electrons to form excitons. The excitons are then delivered to the fluorescent dopant.

In the general organic light emitting device, the number of excitons generated in the singlet and triplet is generated in the ratio of 25:75 (single term: triplet). It can be divided into luminescence. In the case of the phosphorescence emission, the excitons in the triplet excited state move to the ground state and emit light. In the case of the fluorescent emission, the excitons in the singlet excited state are ground state ( The thermally activated delayed fluorescence emission is induced in the reverse interphase transition from the triplet excited state to the singlet excited state, and the singlet excited state This means that excitons move to the ground state and cause fluorescence.

Since the compound of the present invention has a delayed fluorescence property, the excitons of the triplet excited state are generally reverse-transitioned into the singlet excited state, and the energy is transferred to the dopant to give an organic light emission having high efficiency. The device can be implemented.

According to an exemplary embodiment of the present specification, the organic material layer includes a hole blocking layer, an electron transport layer or an electron injection layer, and the hole blocking layer, the electron transport layer or the electron injection layer includes a compound represented by Chemical Formula 1.

According to an exemplary embodiment of the present specification, the electronic blocking layer includes the compound of Formula 1.

According to an exemplary embodiment of the present specification, the electron transport layer comprises a compound of Formula 1.

According to an exemplary embodiment of the present specification, the organic material layer may further include one or more layers selected from the group consisting of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and an electron injection layer.

According to the exemplary embodiment of the present specification, the organic material layer may further include one or more layers selected from the group consisting of a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron injection and a transport layer.

The organic light emitting device of the present specification may be manufactured by materials and methods known in the art, except that at least one layer of the organic material layer includes the compound of the present specification, that is, the compound represented by Chemical Formula 1.

When the organic light emitting device includes a plurality of organic material layers, the organic material layers may be formed of the same material or different materials.

For example, the organic light emitting device of the present specification may be manufactured by sequentially stacking a first electrode, an organic material layer, and a second electrode on a substrate. At this time, by using a physical vapor deposition (PVD: physical vapor deposition) such as sputtering (e-beam evaporation), by depositing a metal or conductive metal oxide or an alloy thereof on the substrate It can be prepared by forming a first electrode, forming an organic material layer including a hole injection layer, a hole transport layer, a light emitting layer and an electron transport layer thereon, and then depositing a material that can be used as a second electrode thereon. In addition to the above method, an organic light emitting device may be manufactured by sequentially depositing a second electrode material, an organic material layer, and a first electrode material on a substrate. In addition, the compound represented by Chemical Formula 1 may be formed as an organic material layer by a solution coating method as well as a vacuum deposition method in the manufacture of the organic light emitting device. Here, the solution coating method means spin coating, dip coating, doctor blading, inkjet printing, screen printing, spray method, roll coating, etc., but is not limited thereto.

According to one embodiment of the present specification, the first electrode is an anode, and the second electrode is a cathode.

According to another exemplary embodiment of the present specification, the first electrode is a cathode, and the second electrode is an anode.

As the anode material, a material having a large work function is usually preferred to facilitate hole injection into the organic material layer. Specific examples of the positive electrode material that can be used in the present invention include metals such as vanadium, chromium, copper, zinc and gold or alloys thereof; Metal oxides such as zinc oxide, indium oxide, indium tin oxide (ITO), indium zinc oxide (IZO); ZnO: Al or SnO ₂ : Combination of metals and oxides such as Sb; Conductive polymers such as poly (3-methylthiophene), poly [3,4- (ethylene-1,2-dioxy) thiophene] (PEDOT), polypyrrole and polyaniline, and the like, but are not limited thereto.

It is preferable that the cathode material is a material having a small work function to facilitate electron injection into the organic material layer. Specific examples of the negative electrode material include metals such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin, and lead or alloys thereof; Multilayer structure materials such as LiF / Al or LiO ₂ / Al, Mg / Ag, and the like, but are not limited thereto.

The hole injection layer is a layer for injecting holes from an electrode with a hole injection material, and has a capability of transporting holes with a hole injection material, and thus has a hole injection effect at an anode, and an excellent hole injection effect with respect to a light emitting layer or a light emitting material. The compound which prevents the movement of the excitons produced | generated in the light emitting layer to the electron injection layer or the electron injection material, and is excellent in thin film formation ability is preferable. Preferably, the highest occupied molecular orbital (HOMO) of the hole injection material is between the work function of the positive electrode material and the HOMO of the surrounding organic material layer. Specific examples of the hole injection material include metal porphyrin, oligothiophene, arylamine-based organic material, hexanitrile hexaazatriphenylene-based organic material, quinacridone-based organic material, and perylene-based Organic materials, anthraquinone, and polyaniline and polythiophene-based conductive polymers, but are not limited thereto.

The hole transport layer is a layer that receives holes from the hole injection layer and transports holes to the light emitting layer. As a hole transport material, the hole transport material is a material capable of transporting holes from the anode or the hole injection layer to the light emitting layer. The material is suitable. Specific examples thereof include an arylamine-based organic material, a conductive polymer, and a block copolymer having a conjugated portion and a non-conjugated portion together, but are not limited thereto.

The light emitting material of the light emitting layer is a material capable of emitting light in the visible region by transporting and combining holes and electrons from the hole transporting layer and the electron transporting layer, respectively, and a material having good quantum efficiency with respect to fluorescence or phosphorescence is preferable. Specific examples thereof include 8-hydroxyquinoline aluminum complex (Alq ₃ ); Carbazole series compounds; Dimerized styryl compounds; BAlq; 10-hydroxybenzoquinoline-metal compound; Benzoxazole, benzothiazole and benzoimidazole series compounds; Poly (p-phenylenevinylene) (PPV) -based polymers; Spiro compounds; Polyfluorene, rubrene and the like, but are not limited thereto.

The light emitting layer may include a host material and a dopant material. The host material is a condensed aromatic ring derivative or a hetero ring-containing compound. Specifically, condensed aromatic ring derivatives include anthracene derivatives, pyrene derivatives, naphthalene derivatives, pentacene derivatives, phenanthrene compounds, and fluoranthene compounds, and heterocyclic-containing compounds include carbazole derivatives, dibenzofuran derivatives, and ladder types. Furan compounds, pyrimidine derivatives, and the like, but are not limited thereto.

Examples of the dopant material include aromatic amine derivatives, styrylamine compounds, boron complexes, fluoranthene compounds, and metal complexes. Specifically, the aromatic amine derivatives include condensed aromatic ring derivatives having a substituted or unsubstituted arylamino group, and include pyrene, anthracene, chrysene, and periplanthene having an arylamino group, and a styrylamine compound may be substituted or unsubstituted. At least one arylvinyl group is substituted with the substituted arylamine, and one or two or more substituents selected from the group consisting of an aryl group, a silyl group, an alkyl group, a cycloalkyl group and an arylamino group are substituted or unsubstituted. Specifically, styrylamine, styryldiamine, styryltriamine, styryltetraamine and the like, but is not limited thereto. In addition, the metal complex includes, but is not limited to, an iridium complex, a platinum complex, and the like.

The electron transport layer is a layer that receives electrons from the electron injection layer and transports electrons to the light emitting layer. As the electron transporting material, a material capable of injecting electrons well from the cathode and transferring them to the light emitting layer is suitable. Do. Specific examples thereof include Al complexes of 8-hydroxyquinoline; Complexes including Alq ₃ ; Organic radical compounds; Hydroxyflavone-metal complexes and the like, but are not limited thereto. The electron transport layer can be used with any desired cathode material as used in accordance with the prior art. In particular, examples of suitable cathode materials are conventional materials having a low work function followed by an aluminum or silver layer. Specifically cesium, barium, calcium, ytterbium and samarium, followed by aluminum layers or silver layers in each case.

The electron injection layer is a layer that injects electrons from an electrode, has an ability to transport electrons, has an electron injection effect from a cathode, an electron injection effect with respect to a light emitting layer or a light emitting material, and hole injection of excitons generated in the light emitting layer The compound which prevents the movement to a layer and is excellent in thin film formation ability is preferable. Specifically, fluorenone, anthraquinodimethane, diphenoquinone, thiopyran dioxide, oxazole, oxadiazole, triazole, imidazole, perylenetetracarboxylic acid, preorenylidene methane, anthrone and the derivatives thereof, metal Complex compounds, nitrogen-containing five-membered ring derivatives, and the like, but are not limited thereto.

Examples of the metal complex compound include 8-hydroxyquinolinato lithium, bis (8-hydroxyquinolinato) zinc, bis (8-hydroxyquinolinato) copper, bis (8-hydroxyquinolinato) manganese, Tris (8-hydroxyquinolinato) aluminum, tris (2-methyl-8-hydroxyquinolinato) aluminum, tris (8-hydroxyquinolinato) gallium, bis (10-hydroxybenzo [h] Quinolinato) beryllium, bis (10-hydroxybenzo [h] quinolinato) zinc, bis (2-methyl-8-quinolinato) chlorogallium, bis (2-methyl-8-quinolinato) ( o-cresolato) gallium, bis (2-methyl-8-quinolinato) (1-naphtolato) aluminum, bis (2-methyl-8-quinolinato) (2-naphtolato) gallium, It is not limited to this.

The organic light emitting device according to the present specification may be a top emission type, a bottom emission type, or a double side emission type according to a material used.

<Production example>

The compound represented by Chemical Formula 1 may be prepared from a reaction of introducing a triazine group through a Suzuki reaction after borylation to 5-chloro-2,4-difluorobenzonitrile as follows. Finally, the nitrogen compound was introduced into the SnAr reaction to synthesize the compounds of the specific example through the following process.

Preparation Example 1-1 Synthesis of Compound 1-A

Scheme 1-1

20 g (115.2 mmol) of 5-chloro-2,4-difluorobenzonitrile, 115.2 mmol of bis (pinacolacto) diboron, 230.5 mmol of potassium acetate and 200 mL of 1,4-dioxane were mixed and heated to 100 ° C. did. Palladium acetate 1mmol% was added thereto, and the mixture was stirred for 12 hours under reflux. After the reaction, the reaction solution was returned to room temperature, extracted with water, and the organic layer was distilled off to obtain a solid. The obtained solid was purified by column chromatography with chloroform / hexane to give 26.6 g of compound 1-A (yield 87%).

MS [M + H] &lt; + &gt; = 266

Preparation Example 2-1 Synthesis of Compound 2-A

Scheme 2-1

21.2 g (80 mmol) of Compound 1-A, 80 mmol of 2-chloro-4,6-diphenyl-1,3,5-triazine, 2000 mL of tetrahydrofuran and 100 mL of water were mixed and heated to 60 ° C. 240 mmol of potassium carbonate and 1 mmol of tetrakistriphenylphosphinepalladium were added thereto, followed by stirring for 3 hours under reflux. After the reaction, the organic layer was extracted from the reaction solution and returned to room temperature, followed by distillation. Purified by column chromatography with chloroform / hexane to give 26.4 g of compound 2-A (89% yield).

MS [M + H] &lt; + &gt; = 371

Preparation Example 2-2 Synthesis of Compound 2-B

Scheme 2-2

Compound 1-A 21.2 g (80 mmol), 2-([1,1'-biphenyl] -3-yl) -4-chloro-6-phenyl-1,3,5-triazine 80 mmol, tetrahydrofuran 2000 mL And 100 mL of water were mixed and heated to 60 ° C. 240 mmol of potassium carbonate and 1 mmol of tetrakistriphenylphosphinepalladium were added thereto, followed by stirring for 3 hours under reflux. After the reaction, the organic layer was extracted from the reaction solution and returned to room temperature, followed by distillation. Purified by column chromatography with chloroform / hexane to give 30.3 g (85% yield) of compound 2-B.

MS [M + H] &lt; + &gt; = 447

Preparation Example 2-3 Synthesis of Compound 2-C

Scheme 2-3

Compound 1-A 21.2 g (80 mmol), 2-chloro-4- (9,9-dimethyl-9H-fluoren-1-yl) -6-phenyl-1,3,5-triazine 80 mmol, tetrahydro 2000 mL of furan and 100 mL of water were mixed and heated to 60 ° C. 240 mmol of potassium carbonate and 1 mmol of tetrakistriphenylphosphinepalladium were added thereto, followed by stirring for 3 hours under reflux. After the reaction, the organic layer was extracted from the reaction solution and returned to room temperature, followed by distillation. Purified by column chromatography with chloroform / hexane to give 31.5g (81% yield) of compound 2-C.

MS [M + H] &lt; + &gt; = 487

Preparation Example 2-4 Synthesis of Compound 2-D

Scheme 2-4

21.2 g (80 mmol) of Compound 1-A, 2-chloro-4- (dibenzo [b, d] furan-3-yl) -6-phenyl-1,3,5-triazine 80 mmol, 2000 mL tetrahydrofuran and 100 mL of water was mixed and heated to 60 ° C. 240 mmol of potassium carbonate and 1 mmol of tetrakistriphenylphosphinepalladium were added thereto, followed by stirring for 3 hours under reflux. After the reaction, the organic layer was extracted from the reaction solution and returned to room temperature, followed by distillation. Purified by column chromatography with chloroform / hexane to give 29.5g of compound 2-D (yield 80%).

MS [M + H] &lt; + &gt; = 461

Preparation Example 3-1 Synthesis of Compound 3-A

Scheme 3-1

Compound 2-C 19.g (40 mmol), 9H-carbazole 40 mmol, 150 mL of dimethylformamide and 120 mmol of potassium carbonate were mixed and heated to 100 ° C. and stirred for 5 hours. After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give 21.5 g of a compound 3-A (85% yield). MS [M + H] &lt; + &gt; = 634

Preparation Example 3-2 Synthesis of Compound 3-B

Scheme 3-2

Compound 2-D 18.4 g (40 mmol), 9H-carbazole 40 mmol, 150 mL of dimethylformamide and 120 mmol of potassium carbonate were mixed and heated to 100 ° C. and stirred for 5 hours. After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give 20.9 g of a compound 3-B (yield 86%). MS [M + H] &lt; + &gt; = 608

Preparation Example 4-1 Synthesis of Compound 1

Scheme 4-1

14.8 g (40 mmol) of Compound 2-A, 80 mmol of 9H-carbazole, 150 mL of dimethylformamide and 200 mmol of potassium carbonate were mixed and heated to 100 ° C. and stirred for 5 hours. After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give 23.4 g (yield 88%) of compound 1 .

MS [M + H] &lt; + &gt; = 665

Preparation Example 4-2 Synthesis of Compound 2

Scheme 4-2

17.8 g (40 mmol) of Compound 2-B, 80 mmol of 9H-carbazole, 150 mL of dimethylformamide and 200 mmol of potassium carbonate were mixed and heated to 100 ° C. and stirred for 5 hours. After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give 25.2 g (yield 85%) of compound 2 .

MS [M + H] &lt; + &gt; = 741

Preparation Example 4-3 Synthesis of Compound 3

Scheme 4-3

14.8 g (40 mmol) of Compound 2-A, 80 mmol of 10H-phenoxazine, 150 mL of dimethylformamide and 200 mmol of potassium carbonate were mixed and heated to 100 ° C. and stirred for 5 hours. After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give 23.1 g (yield 83%) of compound 3 .

MS [M + H] &lt; + &gt; = 697

Preparation Example 4-4 Synthesis of Compound 4

Scheme 4-4

14.8 g (40 mmol) of Compound 2-A, 80 mmol of 10H-phenoxycazine, 150 mL of dimethylformamide and 200 mmol of potassium carbonate were mixed and heated to 100 ° C. and stirred for 5 hours. After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give 24.5 g (yield 84%) of compound 4 .

MS [M + H] &lt; + &gt; = 729

Preparation Example 4-5 Synthesis of Compound 5

Scheme 4-5

14.8 g (40 mmol) of Compound 2-A, 9,9-dimethyl-9,10-dihydroacridine, 80 mmol, dimethylformamide 150 mL and potassium carbonate 200 mmol were mixed and heated to 100 ° C. and stirred for 5 hours. . After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give compound 5 24.6 g (yield 82%).

MS [M + H] &lt; + &gt; = 749

Preparation Example 4-6 Synthesis of Compound 6

Scheme 4-6

14.8 g (40 mmol) of 2-A, 5-phenyl-5,8-dihydroindolo [2,3-c] carbazole, 80 mL of dimethylformamide and 200 mmol of potassium carbonate were mixed and heated to 100 ° C. Stir for 5 hours. After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give 33.4 g of a compound 6 (yield 84%).

MS [M + H] &lt; + &gt; = 995

Preparation Example 4-7 Synthesis of Compound 7

Scheme 4-7

14.8 g (40 mmol) 2-A, 5-phenyl-5,7-dihydroindolo [2,3-b] carbazole 80 mmol, 150 mL dimethylformamide and 200 mmol potassium carbonate were mixed and heated to 100 ° C. Stir for 5 hours. After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give 32.2 g of a compound 7 (yield 81%).

MS [M + H] &lt; + &gt; = 995

Preparation Example 4-8 Synthesis of Compound 8

Scheme 4-8

14.8 g (40 mmol) of Compound 2-A, 80 mmol of 5H-benzopuro [3,2-c] carbazole, 150 mL of dimethylformamide and 200 mmol of potassium carbonate were mixed and heated to 100 ° C. and stirred for 5 hours. After the reaction, the reaction solution returned to room temperature was counterprecipitated with water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give 27.7 g of a compound 8 (yield 82%).

MS [M + H] &lt; + &gt; = 845

Preparation Example 4-9 Synthesis of Compound 9

Scheme 4-9

14.8 g (40 mmol) of Compound 2-A, 80 mmol of 5H-benzo [4,5] cyano [3,2-c] carbazole, 150 mL of dimethylformamide and 200 mmol of potassium carbonate were mixed and heated to 100 ° C. Stir for hours. After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give 28.1 g of a compound 9 (yield 80%).

MS [M + H] &lt; + &gt; = 877

Preparation Example 4-10 Synthesis of Compound 10

Scheme 4-10

14.8 g (40 mmol) of Compound 2-A, 7,7-dimethyl-5,7-dihydroindeno [2,1-b] carbazole 80 mmol, 150 mL of dimethylformamide and 200 mmol of potassium carbonate were mixed and Heated to and stirred for 5 hours. After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give compound 10 28g (yield 78%).

MS [M + H] &lt; + &gt; = 897

Preparation Example 4-11 Synthesis of Compound 11

Scheme 4-11

19 g (30 mmol) of compound 3-A, 30 mmol of 3,6-di-tert-butyl-9H-carbazole, 150 mL of dimethylformamide and 90 mmol of potassium carbonate were mixed and heated to 100 ° C. and stirred for 5 hours. After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give 20.6 g (yield 77%) of compound 11 .

MS [M + H] &lt; + &gt; = 893

Preparation Example 4-12 Synthesis of Compound 12

Scheme 4-12

Compound 3-B 18.2 (30 mmol), 5 mmol of 5H-benzo [4,5] cyano [3,2-c] carbazole, 150 mL of dimethylformamide and 90 mmol of potassium carbonate were mixed and heated to 100 ° C. for 5 hours. Was stirred. After the reaction, the reaction solution returned to room temperature was reverse precipitated in water to obtain a solid, and the obtained solid was recrystallized from chloroform / hexane to give 19.4 g (yield 75%) of compound 12 .

MS [M + H] &lt; + &gt; = 861

In addition to the compounds 1 to 12, by using the same reaction as in Preparation Example, various kinds of substituents may be introduced to synthesize other compounds represented by Chemical Formula 1.

<Example 1>

The compound represented by Chemical Formula 1 according to one embodiment of the present specification was included in a light emitting layer together with a host material (m-CBP) having a triplet energy value of 2.9 eV, to manufacture an organic light emitting device, and to evaluate characteristics thereof.

Comparative Example 1

A glass substrate coated with a thin film of ITO (indium tin oxide) at a thickness of 1,000 Å was placed in distilled water in which detergent was dissolved and ultrasonically cleaned. At this time, Fischer Co. product was used as a detergent, and distilled water filtered secondly as a filter of Millipore Co. product was used as distilled water. After ITO was washed for 30 minutes, ultrasonic washing was performed twice with distilled water for 10 minutes. After washing the distilled water, ultrasonic washing with a solvent of isopropyl alcohol, acetone, methanol, dried and transported to a plasma cleaner. In addition, the substrate was cleaned for 5 minutes using an oxygen plasma, and then the substrate was transferred to a vacuum evaporator. Each thin film was deposited on the ITO transparent electrode thus prepared at a vacuum degree of 5 10 10 ⁻⁴ Pa by vacuum deposition. First, the following compound HAT-CN was thermally vacuum deposited to a thickness of 500 kPa on ITO to form a hole injection layer.

Compound 4-4'-bis [N- (1-naphthyl) -N-phenylamino] biphenyl (NPB) (300 Pa), which is a substance for transporting holes on the hole injection layer, was vacuum deposited to form a hole transport layer. It was.

The compound N-([1,1'-bisphenyl] -4-yl) -N- (4- (11-([1,1'-biphenyl] -4-yl) having a film thickness of 100 kPa on the hole transport layer ) -11H-benzo [a] carbazole-5-yl) phenyl)-[1,1'-biphenyl] -4-amine (EB1) (100 Pa) was vacuum deposited to form an electron blocking layer.

Subsequently, the following m-CBP and the compound 4CzIPN were vacuum-deposited at a weight ratio of 70:30 on the electron blocking layer with a film thickness of 300 Pa to form a light emitting layer.

Compound HB1 was vacuum deposited on the light emitting layer at a film thickness of 100 Pa to form a hole blocking layer.

The following compound ET1 and compound LiQ (Lithium Quinolate) were vacuum deposited on the hole blocking layer in a weight ratio of 1: 1 to form an electron injection and transport layer at a thickness of 300 kPa. On the electron injection and transport layer, lithium fluoride (LiF) and aluminum were deposited sequentially to have a thickness of 12 kW to form a cathode.

In the above process, the deposition rate of the organic material was maintained at 0.4 Å / sec to 0.7 Å / sec, the lithium fluoride at the cathode was maintained at 0.3 Å / sec, and the aluminum at 2 Å / sec. The organic light emitting device was manufactured by maintaining the x10 ^-7 torr to 5 x 10 ^-6 torr.

Experimental Examples 1 to 12

An organic light emitting diode was manufactured according to the same method as Comparative Example 1 except for using the compound of Table 1 instead of the compound 4CzIPN in Comparative Example 1.

<Comparative Examples 2 to 8>

An organic light emitting diode was manufactured according to the same method as Comparative Example 1 except for using the following compound of T1 to T7 instead of compound 4CzIPN in Comparative Example 1.

When the electric current was applied to the organic light emitting element produced by Experimental Examples 1-12 and Comparative Examples 1-8, the result of the following [Table 1] was obtained.

division compound
(Light emitting layer) Voltage
(V @ 10mA / cm ² ) efficiency
(cd / A @ 10mA / cm ² ) Color coordinates
(x, y) Comparative Example 1 4CzIPN 4.5 13 (0.32, 0.62) Experimental Example 1 One 4.0 20 (0.23, 0.64) Experimental Example 2 2 4.0 20 (0.22, 0.63) Experimental Example 3 3 3.9 21 (0.23, 0.63) Experimental Example 4 4 4.0 19 (0.23, 0.64) Experimental Example 5 5 4.1 20 (0.22, 0.65) Experimental Example 6 6 4.0 20 (0.22, 0.64) Experimental Example 7 7 4.0 19 (0.22, 0.66) Experimental Example 8 8 4.1 21 (0.23, 0.64) Experimental Example 9 9 3.9 20 (0.23, 0.65) Experimental Example 10 10 4.0 19 (0.22, 0.64) Experimental Example 11 11 3.9 20 (0.22, 0.65) Experimental Example 12 12 4.0 19 (0.23, 0.64) Comparative Example 2 T1 4.2 11 (0.31, 0.61) Comparative Example 3 T2 4.4 10 (0.32, 0.60) Comparative Example 4 T3 4.5 3 (0.18, 0.38) Comparative Example 5 T4 4.6 2 (0.20, 0.37) Comparative Example 6 T5 4.5 2 (0.25, 0.40) Comparative Example 7 T6 4.3 10 (0.51, 0.42) Comparative Example 8 T7 4.2 11 (0.31, 0.60)

As shown in Table 1, all of the devices of Experimental Examples 1 to 12 using the compound having the structure of the formula (1) as a core was lower than the device using 4CzIPN, the efficiency was obtained. In addition, when comparing the device of Comparative Example 2 to Comparative Example 8 and the present Example, it can be seen that the structure of the present embodiments is improved both in voltage and efficiency.

As shown in Table 1, the compound according to the present invention was confirmed that the excellent light emitting ability and high color purity can be applied to the delayed fluorescent organic light emitting device.

<Example 2>

HOMO and LUMO energy levels were determined by dissolving the measured compound in 5mM and electrolyte in 0.1M concentration in dimethylformamide (dimethylformamide, DMF) and confirming the oxidation and reduction potentials through CV device measurements based on ferrocene compounds. .

Specifically HOMO and LUMO energy levels, singlet energy and triplet energy described herein were measured by the methods described herein above.

compound S1 (eV) T1 (eV) HOMO (eV) LUMO (eV) △ E _ST (eV) One 2.43 2.37 5.68 3.08 0.06 2 2.42 2.36 5.67 3.08 0.06 3 2.43 2.36 5.68 3.07 0.07 4 2.43 2.38 5.63 3.08 0.05 5 2.42 2.37 5.66 3.06 0.05 6 2.42 2.38 5.61 3.07 0.04 7 2.43 2.39 5.62 3.05 0.04 8 2.44 2.37 5.66 3.09 0.07 9 2.42 2.38 5.65 3.06 0.04 10 2.43 2.37 5.67 3.07 0.06 11 2.42 2.37 5.68 3.03 0.05 12 2.42 2.38 5.66 3.06 0.04 T1 2.54 2.39 5.61 3.05 0.15 T2 2.55 2.40 5.63 3.07 0.15 T3 2.77 2.41 6.06 2.91 0.36 T4 2.74 2.40 5.99 2.89 0.34 T5 2.78 2.41 5.98 2.88 0.37 T6 2.24 2.20 5.45 3.00 0.04 T7 2.45 2.37 5.73 3.05 0.08 4CzIPN 2.44 2.39 5.55 3.15 0.05

It can be seen that the compounds 1 to 12 used in the Examples of the present invention are all suitable as delayed fluorescent materials with ΔE _ST of 0.3 eV or less. 4CzIPN, T1, T2, T6, and T7 correspond to delayed fluorescent materials with ΔE _ST of 0.3 eV or less, but as shown in Table 1, compounds 1 to 12 have improved characteristics in terms of voltage and efficiency. Could know.

Although the preferred experimental examples of the present invention have been described above, the present invention is not limited thereto, and various modifications can be made within the scope of the claims and the detailed description of the invention, which also belong to the scope of the invention. .

1: substrate
2: anode
3: light emitting layer
4: cathode
5: hole injection layer
6: hole transport layer
7: electron transport layer
8: electronic jersey
9: hole blocking layer
10: electron injection and transport layer

Claims (9)

Compound represented by the following formula (1):
[Formula 1]

In Chemical Formula 1,
X1 and X2 are the same as or different from each other, and each independently a direct bond; O; S or CRR ',
Y1 and Y2 are the same as or different from each other, and each independently NRa; S or CRbRc, n1 and n2 are each 0 or 1,
Ar1 and Ar2 are the same as or different from each other, and each independently a substituted or unsubstituted aryl group; Or a substituted or unsubstituted heteroaryl group,
R1 to R6, Ra to Rc, R and R 'are the same as or different from each other, and each independently hydrogen; heavy hydrogen; Nitrile group; Substituted or unsubstituted alkyl group; A substituted or unsubstituted cycloalkyl group; Substituted or unsubstituted alkoxy group; Substituted or unsubstituted aryloxy group; Substituted or unsubstituted alkenyl group; Substituted or unsubstituted silyl group; Substituted or unsubstituted amine group; Substituted or unsubstituted aryl group; Or a substituted or unsubstituted heteroaryl group,
a to d are each an integer of 0 to 4, e and f are each an integer of 0 to 4, e + n1 is 3 or less, f + n2 is 3 or less, and in parentheses when a to f are plural. The substituents are the same or different from each other. The method according to claim 1, Ar1 and Ar2 are the same as or different from each other, each independently represent a substituted or unsubstituted C6-C12 aryl group; Or a substituted or unsubstituted C2-C12 heteroaryl group. The compound of claim 1, wherein at least one of n1 and n2 is one. The compound of claim 1, wherein Formula 1 is selected from the following formulas:
[Formula 2]

[Formula 3]

[Formula 4]

[Formula 5]

[Formula 6]

[Formula 7]

[Formula 8]

[Formula 9]

[Formula 10]

[Formula 11]

[Formula 12]

[Formula 13]

[Formula 14]

[Formula 15]

In Formulas 2 to 15, the substituent definition is the same as in Claim 1. The compound of claim 1, wherein Formula 1 is any one of the following compounds:

A first electrode; A second electrode provided to face the first electrode; And an organic light emitting device including one or two or more organic material layers provided between the first electrode and the second electrode, wherein one or more layers of the organic material layers include the compound of any one of claims 1 to 5 Light emitting element. The organic light emitting device of claim 6, wherein the organic material layer includes a light emitting layer, and the light emitting layer includes the compound. The organic light emitting device of claim 6, wherein the organic material layer includes a hole injection layer, a hole transport layer, or an electron blocking layer, and the hole injection layer, the hole transport layer, or the electron blocking layer includes the compound. The organic light emitting device of claim 6, wherein the organic material layer includes a hole blocking layer, an electron transport layer, or an electron injection layer, and the hole blocking layer, the electron transport layer, or the electron injection layer includes the compound.

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