CN105745200B - Novel organic electroluminescent compounds and organic electroluminescent device comprising the same - Google Patents

Novel organic electroluminescent compounds and organic electroluminescent device comprising the same Download PDF

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CN105745200B
CN105745200B CN201480063398.1A CN201480063398A CN105745200B CN 105745200 B CN105745200 B CN 105745200B CN 201480063398 A CN201480063398 A CN 201480063398A CN 105745200 B CN105745200 B CN 105745200B
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K-J·李
C-S·金
S-W·李
S-H·李
J-E·杨
Y-K·金
H-J·李
Y-J·曹
K-J·朴
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Rohm and Haas Electronic Materials Korea Ltd
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Abstract

The present invention relates to a novel organic electroluminescent compound and an organic electroluminescent device comprising the same. The organic electroluminescent compounds according to the present invention can be used in a light-emitting layer and have excellent light-emitting efficiency; and an organic electroluminescent device comprising the organic electroluminescent compound of the present invention has a long life span and improved current efficiency and power efficiency.

Description

Novel organic electroluminescent compounds and organic electroluminescent device comprising the same
Technical Field
The present invention relates to novel organic electroluminescent compounds and organic electroluminescent devices containing the same.
Background
Electroluminescent (EL) devices are self-emissive devices that have the advantage of providing a wider viewing angle, a greater contrast ratio, and a faster response time. Organic EL devices were originally developed by Eastman Kodak (Eastman Kodak) by using small aromatic diamine molecules and aluminum complexes as materials for forming a light-emitting layer (see appl. phys. lett.) -51, 913, 1987.
An organic EL device generally includes an anode, a cathode, and an organic layer formed between the two electrodes and emits light when holes injected from the anode and electrons injected from the cathode form an excited state by recombination thereof and then the excited state returns to a ground state. The organic layer of the organic EL device may be composed of a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), an Electron Blocking Layer (EBL), an emission layer (EML), a Hole Blocking Layer (HBL), an Electron Transport Layer (ETL), an Electron Injection Layer (EIL), and the like; the material used in the organic layer may be classified into a hole injecting material, a hole transporting material, an electron blocking material, a light emitting material, a hole blocking material, an electron transporting material, an electron injecting material, and the like.
The most important factor determining the luminous efficiency in an organic EL device is a light emitting material. There is a need for luminescent materials having the following characteristics: high quantum efficiency, high mobility of electrons and holes, formability of a uniform light emitting material layer, and stability. A mixed system of dopant/host materials can be used as a luminescent material to improve color purity, luminous efficiency, and stability. If a dopant/host material system is used, then the choice of host material is important, as host material can greatly affect the efficiency and performance of the light emitting device. Among conventional techniques, 4, 4 '-N, N' -dicarbazole-biphenyl (CBP) is the most widely known phosphorescent host material. Pioneer et al currently develop high-efficiency organic EL devices by using Bathocuproine (BCP), bis (2-methyl-8-quinolinato) (4-phenylphenol) aluminum (III) (BAlq), etc., which are used in the hole blocking layer, as host materials.
Although these phosphorescent host materials provide good luminescent characteristics, they have the following disadvantages: (1) due to its low glass transition temperature and poor thermal stability, it may decompose during high temperature deposition processes in vacuum. (2) The power efficiency of an organic EL device is given by [ (pi/voltage) × current efficiency ], and is inversely proportional to the voltage. Organic EL devices comprising phosphorescent host materials provide higher current efficiency (cd/a) and have higher driving voltages than devices comprising fluorescent host materials. Therefore, the organic EL device using the conventional phosphorescent host material has no advantage in power efficiency (lm/W). (3) In addition, the operating life and luminous efficacy of the organic EL device are unsatisfactory.
The present invention can minimize crystallization by heat during and after vapor deposition at high temperature by increasing the thermal stability of the material.
Generally, the glass transition temperature (Tg) should be increased to increase thermal stability. To increase the Tg, a number of substituents should be attached. However, the temperature of vapor deposition increases excessively when many substituents are combined and the material degrades and is damaged during vapor deposition. Therefore, a suitable Tg should be maintained by introducing a suitable number of substituents and the vapor deposition temperature should be kept low despite the high molecular weight. The present invention solves the above problems by introducing carbazolyl group to the 9-position of fluorene structure. Although the material of the present invention has a high molecular weight, it has a lower vapor deposition temperature than carbazole derivatives having a similar molecular weight. Furthermore, the materials of the present invention have a high Tg. This feature results from the carbazolyl group substituting the 9-position of the fluorene structure, thereby increasing the steric hindrance of the fluorene structure. The higher the steric hindrance, the less the interaction between the molecules and the lower the vapor deposition temperature.
Therefore, in order to exhibit excellent characteristics of the organic EL device, materials constituting the organic layers in the device, specifically, hosts or dopants should be appropriately selected. Meanwhile, korean patent nos. 10-0957288, 10-0948700, and 10-0955993 disclose a compound in which a nitrogen-containing heterocyclic group is bonded to a carbazolyl group, a compound in which a nitrogen-containing heterocyclic group is bonded to an aryl carbazole or a carbazolylalkylene group, and an indolocarbazole derivative of a specific structure as host materials in a light-emitting layer, respectively. However, the organic EL device including the compound described in the above publication still does not satisfy power efficiency, light emission efficiency, lifetime, and the like. Accordingly, the present inventors have attempted to find an organic electroluminescent compound that can provide an organic EL device having characteristics superior to those of the compounds described in the above publications, and have found a material having a high Tg and a low vapor deposition temperature via the introduction of a carbazolyl group at the 9-position of the fluorene structure, and thus can provide an organic EL device having high luminous efficiency and excellent characteristics.
Disclosure of Invention
Technical problem
It is an object of the present invention to provide an organic electroluminescent compound having high luminous efficiency and to provide an organic EL device comprising the organic electroluminescent compound and having a long driving life as well as improved power efficiency and current efficiency.
Solution to the problem
The present inventors found that the above object can be achieved by a compound represented by the following formula 1:
Figure BDA0000994466550000021
wherein
A1Represents a substituted or unsubstituted 5-to 30-membered heteroaryl;
L1represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted 5-to 30-membered heteroarylene;
R1represents a substituted or unsubstituted (C1-C30) alkyl group, a substituted or unsubstituted (C6-C30) aryl group, a substituted or unsubstituted 5-to 30-membered heteroaryl group, a substituted or unsubstituted (C3-C30) cycloalkyl group, a substituted or unsubstituted (C1-C30) alkylamino group, a substituted or unsubstituted (C6-C30) arylamino group or a substituted or unsubstituted (C1-C30) alkyl (C6-C30) arylamino group;
R2represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted 5-to 30-membered heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted (C1-C30) alkylsilyl, substituted or unsubstituted (C6-C30) arylsilyl, substituted or unsubstituted (C6-C30) aryl (C1-C30) alkylsilyl, substituted or unsubstituted (C1-C30) alkylamino, substituted or unsubstituted (C6-C30) arylamino, or substituted or unsubstituted(C1-C30) alkyl (C6-C30) arylamino or the following formula 2:
Figure BDA0000994466550000031
or
R2Forming a benzocarbazole by fusing to a carbazole ring;
R3represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted 5-to 30-membered heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted (C1-C30) alkylsilyl, substituted or unsubstituted (C6-C30) arylsilyl, substituted or unsubstituted (C6-C30) aryl (C1-C30) alkylsilyl, substituted or unsubstituted (C1-C30) alkylamino, substituted or unsubstituted (C6-C30) arylamino or substituted or unsubstituted (C1-C30) alkyl (C6-C30) arylamino;
x represents O, S, CR11R12、NR13Or SiR13R14
R4、R5And R6Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted 5-to 30-membered heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted (C1-C30) alkylsilyl, substituted or unsubstituted (C6-C30) arylsilyl, substituted or unsubstituted (C6-C30) aryl (C1-C30) alkylsilyl, substituted or unsubstituted (C1-C30) alkylamino, substituted or unsubstituted (C6-C30) arylamino or substituted or unsubstituted (C1-C30) alkyl (C6-C30) arylamino; or are linked to an adjacent substituent(s) to form a mono-or polycyclic (C3-C30) alicyclic or aromatic ring, a carbon atom of which may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur;
R11to R14Each independently represents a substituted or unsubstituted (C1-C30) alkyl group, a substituted or unsubstituted (C6-C30) aryl group, or a substituted or unsubstituted 5-to 30-membered heteroaryl group; or are linked to an adjacent substituent(s) to form a mono-or polycyclic (C3-C30) alicyclic or aromatic ring, a carbon atom of which may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur;
a. c, d and e each independently represent an integer of 1 to 4; wherein a, c, d or e is an integer of 2 or greater, each R2、R4、R5Or R6The same or different;
b represents an integer of 1 to 3; wherein b is an integer of 2 or greater, each R3The same or different;
n represents an integer of 0 or 1;
m represents an integer of 1 or 2; and
the heteroaryl (ene) group contains at least one heteroatom selected from B, N, O, S, P (═ O), Si, and P.
Advantageous effects of the invention
The organic electroluminescent compounds according to the present invention have high luminous efficiency compared to conventional materials, and thus organic EL devices comprising the compounds as light-emitting host materials have long driving lifetimes and improved power efficiency, thereby reducing consumed power.
Detailed Description
Modes for the invention
Hereinafter, the present invention will be described in detail. However, the following description is intended to explain the invention and is not intended to limit the scope of the invention in any way.
The present invention relates to an organic electroluminescent compound represented by formula 1, an organic electroluminescent material comprising the organic electroluminescent compound, and an organic EL device comprising the material.
In this context, "(C1-C30) (alkylene)" means a straight or branched chain (alkylene) group having 1 to 30 carbon atoms, wherein the number of carbon atoms is preferably 1 to 20, more preferably 1 to 10, and includes methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl and the like. "(C2-C30) alkenyl" means a straight or branched alkenyl group having 2 to 30 carbon atoms, wherein the number of carbon atoms is preferably 2 to 20, more preferably 2 to 10, and includes ethenyl, 1-propenyl, 2-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-methylbut-2-enyl and the like. "(C2-C30) alkynyl" is a straight or branched chain alkynyl group having 2 to 30 carbon atoms, wherein the number of carbon atoms is preferably 2 to 20, more preferably 2 to 10, and includes ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-methylpent-2-ynyl, and the like. "(C3-C30) cycloalkyl" is a monocyclic or polycyclic hydrocarbon having 3 to 30 carbon atoms, wherein the number of carbon atoms is preferably 3 to 20, more preferably 3 to 7, and includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and the like. "3-to 7-membered heterocycloalkyl" is a cycloalkyl group having at least one heteroatom selected from the group consisting of B, N, O, S, P (═ O), Si, and P, preferably O, S, and N, and 3 to 7, preferably 5 to 7, ring backbone atoms, and includes tetrahydrofuran, pyrrolidine, thiacyclopentane, tetrahydropyran, and the like. "(C6-C30) (arylene) group" is a single or condensed ring derived from an aromatic hydrocarbon having 6 to 30 carbon atoms, wherein the number of carbon atoms is preferably 6 to 20, more preferably 6 to 15, and includes phenyl, biphenyl, terphenyl, naphthyl, fluorenyl, phenanthryl, anthracyl, indenyl, triphenylenyl, pyrenyl, fused tetraphenyl, perylenyl, chrysenyl, tetracenyl, fluoranthenyl, and the like. A "3-to 30-membered (arylene) heteroaryl" is an aryl group having at least one, preferably 1 to 4 heteroatoms selected from the group consisting of B, N, O, S, P (═ O), Si, and P, and having 3 to 30 ring backbone atoms; a monocyclic ring or a condensed ring condensed with at least one benzene ring; having preferably 3 to 20, more preferably 3 to 15 ring backbone atoms; may be partially saturated; may be a group formed by connecting at least one heteroaryl or aryl group to a heteroaryl group via a single bond; and include monocyclic heteroaryl groups including furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl and the like, and fused-ring heteroaryl groups including benzofuranyl, benzothienyl, isobenzofuranyl, dibenzofuranyl, dibenzothienyl, benzimidazolyl, benzothiazolyl, benzisothiazolyl, benzisoxazolyl, benzoxazolyl, isoindolyl, indolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, quinazolinyl, quinoxalinyl, carbazolyl, phenazinyl, phenanthridinyl, benzodioxolyl and the like. "halogen" includes F, Cl, Br and I.
In this context, "substituted" in the expression "substituted or unsubstituted" means that a hydrogen atom in a certain functional group is replaced by another atom or group, i.e., a substituent. A of formula 11、h1、R1To R6And R11To R14The substituents of substituted (C1-C30) alkyl, substituted (C1-C30) alkoxy, substituted (C3-C30) cycloalkyl, substituted (C6-C30) (arylene), substituted 5-to 30-membered (arylene) heteroaryl, and substituted (C6-C30) aryl (C1-C30) alkyl of (a) are each independently at least one substituent selected from the group consisting of: deuterium; halogen; a cyano group; a carboxyl group; a nitro group; a hydroxyl group; (C1-C30) alkyl; halo (C1-C30) alkyl; (C2-C30) alkenyl; (C2-C30) alkynyl; (C1-C30) alkoxy; (C1-C30) alkylthio; (C3-C30) cycloalkyl; (C3-C30) cycloalkenyl; 3-to 7-membered heterocycloalkyl; (C6-C30) aryloxy; (C6-C30) arylthio; a 3-to 30-membered heteroaryl unsubstituted or substituted with a (C6-C30) aryl group; (C6-C30) aryl unsubstituted or substituted with 3-to 30-membered heteroaryl; a tri (C1-C30) alkylsilyl group; a tri (C6-C30) arylsilyl group; di (C1-C30) alkyl (C6-C30) arylsilyl; (C1-C30) alkyldi (C6-C30) arylsilyl; an amino group; mono-or di (C1-C30) alkylamino; mono-or di (C6-C30) arylamino; (C1-C30) alkyl (C6-C30) arylamino; (C1-C30) alkylcarbonyl; (C1-C30) alkoxycarbonyl; (C6-C30) arylcarbonyl; a bis (C6-C30) arylboron group; a di (C1-C30) alkylboron group; (C1-C30) alkyl (C6-C30) arylboronyl; (C6-C30) aryl (C1-C30) alkyl; and (C1-C30) alkyl (C6-C30) aryl.
The compound of formula 1 is represented by the following formula 3, 4 or 5:
Figure BDA0000994466550000061
Figure BDA0000994466550000062
Figure BDA0000994466550000063
wherein
A1、L1、R1To R5A, b, c, d, m and n are as defined in formula 1.
In the compound of formula 1, A1Preferably represents pyridine, pyrimidine, triazine, pyrazine, quinoline, quinazoline, quinoxaline or naphthyridine; l is1Represents a single bond or (C6-C20) arylene; r1Represents (C1-C20) alkyl, (C6-C20) aryl or 5-to 20-membered heteroaryl; r2Represents hydrogen, deuterium, (C6-C20) aryl, 5-to 20-membered heteroaryl, (C6-C20) arylamino, or formula 2, or a benzocarbazole formed by fusion to a carbazole ring; r3、R4、R5And R6Each independently represents hydrogen or (C1-C20) alkyl; and R is11To R14Each independently represents a (C1-C20) alkyl group, a (C6-C20) aryl group, or a 5-to 20-membered heteroaryl group.
The compound of formula 1 may be selected from the group consisting of:
Figure BDA0000994466550000064
Figure BDA0000994466550000071
Figure BDA0000994466550000081
Figure BDA0000994466550000091
the organic electroluminescent compounds according to the invention can be prepared by methods known to those skilled in the art and can be prepared, for example, according to the following reaction scheme 1:
reaction scheme 1
Figure BDA0000994466550000092
Wherein
A1、L1、R1To R5A, b, c, d, m and n are as defined in formula 1 and Hal represents halogen.
The present invention further provides an organic electroluminescent material comprising the organic electroluminescent compound of formula 1 and an organic electroluminescent device comprising the same. The material may contain the organic electroluminescent compound of the present invention alone, or may further include conventional materials generally included in organic electroluminescent materials.
The organic electroluminescent device according to the present invention may include a first electrode, a second electrode, and at least one organic layer between the first electrode and the second electrode, wherein the organic layer includes at least one organic electroluminescent compound of formula 1.
One of the first electrode and the second electrode may be an anode and the other may be a cathode. The organic layer may include a light emitting layer, and may further include at least one layer selected from the group consisting of: a hole injection layer, a hole transport layer, an electron blocking layer, an electron transport layer, an electron injection layer, an interlayer, and a hole blocking layer.
The organic electroluminescent compound of formula 1 according to the present invention may be included as a light emitting layer. Preferably, the light emitting layer may further include at least one dopant, and may include other compounds as a second host material, if necessary, in addition to the organic electroluminescent compound of formula 1 of the present invention.
The present invention further provides a substance for producing an organic EL device. The substance comprises first and second host materials. The first host material includes the organic electroluminescent compound of the present invention. The weight ratio of the first host material to the second host material may be in the range of 1: 99 to 99: 1.
The second host material may be any one of known phosphorescent hosts, and is preferably selected from the group consisting of compounds of the following formulae 6 to 10 in view of luminous efficiency:
H-(Cz-L4)h-M (6)
H-(Cz)iL4-M (7)
Figure BDA0000994466550000101
Figure BDA0000994466550000102
Figure BDA0000994466550000103
wherein
Cz represents the following structure:
Figure BDA0000994466550000104
x represents O or S;
R21to R24Each independently represents hydrogen, deuterium, halogen, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted 5-or 30-membered heteroaryl, or R25R26R27Si-; or are linked to adjacent substituents to form a mono-or polycyclic (C5-C30) alicyclic or aromatic ring, the carbon atoms of which may beSubstituted with at least one heteroatom selected from nitrogen, oxygen and sulfur;
R25to R27Each independently represents a substituted or unsubstituted (C1-C30) alkyl group, or a substituted or unsubstituted (C6-C30) aryl group;
L4represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted 5-or 30-membered heteroarylene;
m represents a substituted or unsubstituted (C6-C30) aryl, or a substituted or unsubstituted 5-or 30-membered heteroaryl;
Y1and Y2Each independently represents-O-, -S-, -N (R)31) -or-C (R)32)(R33) -; and Y is1And Y2Not exist at the same time;
R31to R33Each independently represents a substituted or unsubstituted (C1-C30) alkyl group, a substituted or unsubstituted (C6-C30) aryl group, or a substituted or unsubstituted 5-or 30-membered heteroaryl group; or are linked to an adjacent substituent(s) to form a mono-or polycyclic (C5-C30) alicyclic or aromatic ring, a carbon atom of which may be replaced with at least one hetero atom selected from nitrogen, oxygen, and sulfur; and R is32And R33May be the same or different;
h and i each independently represent an integer of 1 to 3;
j. k, l and m each independently represent an integer of 0 to 4;
wherein h, i, j, k, L or m is an integer of 2 or more, each (Cz-L)4) Each (Cz), each R21Each R22Each R23Or each R24The same or different.
Specifically, the second host material includes each of:
Figure BDA0000994466550000111
Figure BDA0000994466550000121
Figure BDA0000994466550000131
wherein TPS represents triphenylsilyl.
The dopant is preferably one or more phosphorescent dopants. The phosphorescent dopant material used for the organic electroluminescent device of the present invention is not particularly limited, but may be preferably selected from complex compounds of iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), more preferably from ortho-metalated complex compounds of iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), and even more preferably from ortho-metalated iridium complex compounds.
The dopant used in the organic electroluminescent device of the present invention may be selected from the group consisting of compounds represented by formulae 11 to 13 below:
Figure BDA0000994466550000132
Figure BDA0000994466550000133
Figure BDA0000994466550000141
wherein
L is selected from the following structures:
Figure BDA0000994466550000142
R100represents hydrogen, substituted or unsubstituted (C1-C30) alkyl, or substituted or unsubstituted (C3-C30) cycloalkyl; r101To R109And R111To R123Each independently represents hydrogen, deuterium, halogen, unsubstituted or halogen-substituted(C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, cyano, or substituted or unsubstituted (C1-C30) alkoxy; r120To R123To adjacent substituents to form fused rings, such as quinoline; r124To R127Each independently represents hydrogen, deuterium, halogen, substituted or unsubstituted (C1-C30) alkyl, or substituted or unsubstituted (C6-C30) aryl; when R is124To R127When aryl, it is linked to an adjacent substituent to form a fused ring, e.g., fluorene; r201To R211Each independently represents hydrogen, deuterium, halogen, unsubstituted or halogen-substituted (C1-C30) alkyl, or substituted or unsubstituted (C3-C30) cycloalkyl; f and g each independently represent an integer of 1 to 3; wherein f or g is an integer of 2 or more, each R100May be the same or different; and n represents an integer of 1 to 3.
The dopant material includes each of:
Figure BDA0000994466550000143
Figure BDA0000994466550000151
Figure BDA0000994466550000161
Figure BDA0000994466550000171
the organic layer of the organic electroluminescent device of the present invention comprises the organic electroluminescent compound of formula 1 and may further include at least one compound selected from the group consisting of: arylamine-based compounds and styrylarylamine-based compounds.
In the organic electroluminescent device of the present invention, the organic layer may further include at least one metal selected from the group consisting of: organometallic of group 1 metals, group 2 metals, transition metals of period 4, transition metals of period 5, lanthanides and d-transition elements of the periodic table, or at least one complex compound comprising said metals.
In addition, the organic electroluminescent device of the present invention may emit white light by: the mode further comprises at least one light-emitting layer comprising a blue electroluminescent compound, a red electroluminescent compound or a green electroluminescent compound in addition to the organic electroluminescent compound of the present invention; and may further include a yellow or orange light emitting layer, if necessary.
Preferably, in the organic electroluminescent device of the present invention, at least one layer selected from a chalcogenide layer, a metal halide layer, and a metal oxide layer (hereinafter, referred to as "surface layer") may be disposed on the inner surface of one or both electrodes. Specifically, it is preferable that a chalcogenide (including oxide) layer having silicon or aluminum is disposed on the anode surface of the light emitting intermediate layer, and a metal halide layer or a metal oxide layer is disposed on the cathode surface of the electroluminescent intermediate layer. The surface layer provides operational stability of the organic electroluminescent device. Preferably, the chalcogenide compound comprises SiOX(1≤X≤2)、AlOX(X is more than or equal to 1 and less than or equal to 1.5), SiON, SiAlON and the like; the metal halide includes LiF, MgF2、CaF2Rare earth metal fluorides, etc.; and the metal oxide comprises Cs2O、Li2O, MgO, SrO, BaO, CaO, etc.
Preferably, in the organic electroluminescent device of the present invention, a mixed region of the electron transport compound and the reductive dopant or a mixed region of the hole transport compound and the oxidative dopant may be disposed on at least one surface of the pair of electrodes. In this case, the electron transport compound is reduced to an anion, and thus it becomes easier to inject and transport electrons from the mixed region into the luminescent medium. In addition, the hole transport compound is oxidized into cations, and thus it becomes easier to inject and transport holes from the mixed region into the light emitting medium. Preferably, the oxidizing dopant includes various Lewis acids (Lewis acids) and acceptor compounds; and the reducing dopant includes alkali metals, alkali metal compounds, alkaline earth metals, rare earth metals, and mixtures thereof. The reductive dopant layer may be used as a charge generation layer to prepare an organic electroluminescent device having two or more light emitting layers and emitting white light.
In order to form each layer constituting the organic electroluminescent device of the present invention, a dry film forming method such as vacuum deposition, sputtering, plasma, ion plating method, or the like, or a wet film forming method such as spin coating, dip coating, flow coating method, or the like may be used.
When a wet film formation method is used, a thin film is formed by dissolving or dispersing a material constituting each layer in a suitable solvent (e.g., ethanol, chloroform, tetrahydrofuran, dioxane, or the like). The solvent is not particularly limited as long as the material constituting each layer is soluble or dispersible in the solvent without causing any problem in forming the layer.
Hereinafter, the light emitting characteristics of the organic electroluminescent compounds, the preparation methods thereof, and the devices comprising the same according to the present invention will be described in detail with reference to the following examples:
example 1: preparation of Compound H-34
Figure BDA0000994466550000181
Preparation of Compounds 1-2
2-Bromobiphenyl (50.0g, 214.0mmol) and Tetrahydrofuran (THF) (1.0L) were cooled to-78 deg.C in a 3L Round Bottom Flask (RBF) and 2.5M n-butyllithium (103.0mL, 257.0mmol) was added thereto. After 2 hours, (4-bromophenyl) (phenyl) methanone (56.0g, 214.0mmol) was added to the flask. After 17 hours, with dichloromethane (MC) and H2O extract the mixture and pass the MC layer over MgSO4And (5) drying. The MC layer was concentrated to give Compound 1-1.
Stirring Compound 1 in 3L RBF under reflux-1, hydrochloric acid (100.0mL) and acetic acid (1.0L). After 14 hours, the resulting solid was filtered and the filtered solid was dissolved in chloroform (CHCl)3) And applied to column chromatography to obtain compound 1-2(35.0g, 42%).
Preparation of Compounds 1-3
Compounds 1-2(35.0g, 89.0mmol), bis (pinacolato) diborane (27.0g, 106.0mmol), bis (triphenylphosphine) palladium (II) dichloride (Pd (PPh) were stirred in 1L RBF at reflux3)2Cl2) (3.1g, 4.45mmol), potassium acetate (KOAc) (22.0g, 222.0mmol), and 1, 4-dioxane (445.0 mL). After 3 hours, with Dichloromethane (DCM) and H2The mixture was extracted with O and the DCM layer was passed over MgSO4Dried and filtered. Dissolving the obtained solid in CHCl3And applied to column chromatography to obtain compounds 1-3(22.0g, 56%).
Preparation of Compounds 1-4
Compounds 1-3(22.0g, 50.0mmol), 2-bromonitrobenzene (12.0g, 60.0mmol), tetrakis (triphenylphosphine) palladium (0) (Pd (PPh) were stirred under reflux in 500mL RBF3)4)(1.7g,1.5mmol)、K2CO3(13.7g, 99.4mmol), toluene (100.0mL), ethanol (EtOH) (25.0mL), and H2O (25.0L). After 5 hours, with DCM and H2The mixture was extracted with O and the DCM layer was passed over MgSO4Dried and filtered. Dissolving the obtained solid in CHCl3And applied to column chromatography to obtain compounds 1-4(15.0g, 70%).
Preparation of Compounds 1-5
Compounds 1-4(15.0g, 35.0mmol), triethyl phosphite (P (OEt) and stirred under reflux in 500mL RBF3) (100.0mL) and 1, 2-dichlorobenzene (1, 2-DCB) (50.0 mL). After 13 hours, the solvent was distilled off, and the residue was dissolved in CHCl3And applied to column chromatography to obtain compounds 1-5(8.42g, 59%).
Preparation of Compounds 1-6
Compound by stirring in 500mL RBF under refluxSubstances 1-5(8.4g, 21.0mmol), 1-bromo-3-iodobenzene (8.7g, 31.0mmol), Cul (2.0g, 10.3mmol), ethylenediamine (1.4mL, 21.0mmol), K3PO4(13.0g, 62.0mmol) and toluene (103.0mL) for 23 h. After completion of the reaction, let to cool to room temperature and use DCM and H2O extraction and DCM layer over MgSO4And (5) drying. The DCM layer was concentrated under reduced pressure and the resulting solution was applied to column chromatography to obtain compounds 1-6(9.5g, 94%).
Preparation of Compounds 1-7
Compounds 1-6(9.5g, 19.5mmol), bis (pinacolato) diborane (6.4g, 25.0mmol), Pd (PPh) were stirred in 500mL RBF at reflux3)2Cl2) (684.0mg, 0.97mmol), KOAc (4.8g, 49.0mmol), and 1, 4-dioxane (196.0 mL). After 6 hours, with DCM and H2The mixture was extracted with O and the DCM layer was passed over MgSO4Dried and filtered. Dissolving the obtained solid in CHCl3And applied to column chromatography to obtain compounds 1-7(8.0g, 69%).
Preparation of Compound H-34
Compounds 1-7(8.0g, 13.0mmol), 2-chloro-4, 6-diphenyl-1, 3, 5-triazine (4.2g, 15.7mmol), Pd (PPh) in 250mL RBF were stirred at reflux3)4(454.0mg,0.39mmol)、K2CO3(3.6g, 26.0mmol), toluene (30.0mL), EtOH (7.0mL), and H2O (7.0 mL). After 3 hours, with DCM and H2The mixture was extracted with O and the DCM layer was passed over MgSO4Dried and filtered. Dissolving the obtained solid in CHCl3And applied to column chromatography to obtain compound H-34(3.95g, 42%).
mp 288 ℃, UV 290nm (in toluene), PL 430nm (in toluene), MS/EIMS 714.28
Example 2: preparation of Compound H-57
Figure BDA0000994466550000201
Preparation of Compound 2-1
Compounds 1-3(35.0g, 78.0mmol), 2, 5-dibromonitrobenzene (26.2g, 93.0mmol), Pd (PPh) were stirred in 2L RBF at 130 deg.C3)4(3.6g,3.1mmol)、Na2CO3(20.6g, 195.0mmol), toluene (400.0mL), EtOH (50.0mL), and H2O (100.0mL) overnight. With Ethyl Acetate (EA) and H2Treating the reaction mixture with MgSO4The water was removed, and the residue was distilled under reduced pressure. The crude product was applied to a sample having an MC: column chromatography of hexane (Hx) to obtain compound 2-1(30.0g, 75%) as a solid.
Preparation of Compound 2-2
Stirring Compound 2-1(30.0g, 57.8mmol), P (OEt) in 1L RBF at 150 deg.C3(200.0mL) and 1, 2-DCB (200.0mL) for 2 hours. The reaction mixture was distilled to obtain a solid. The crude product was applied to a sample having an MC: column chromatography of Hx afforded compound 2-2(19.0g, 68%) as a white solid.
Preparation of Compounds 2-3
Compounds 2-2(5.7g, 47.0mmol), Pd (PPh) were stirred at 120 ℃ in 500mL RBF3)4(1.8g,1.5mmol)、K2CO3(13.5g, 97.0mmol), toluene (200.0mL), EtOH (50.0mL), and H2O (50.0mL) for 2.5 h. With EA and H2Treating the reaction mixture with MgSO4The water was removed, and the residue was distilled under reduced pressure. The crude product was applied to a sample having an MC: column chromatography of Hx afforded compound 2-3(16.0g, 84%) as a white solid.
Preparation of Compound H-57
Compounds 2-3(10.0g, 20.6mmol), 2- (3-bromophenyl) -4, 6-diphenyl-1, 3, 5-triazine (9.6g, 24.8mmol), palladium (II) acetate (Pd (OAc))2) (232.0mg, 1.0mmol), 2-dicyclohexylphosphino-2 ', -6' -dimethoxydiphenyl (s-phos) (850.0mg, 2.0mmol), sodium tert-butoxide (NaOtBu) (5.0g, 51.6mmol) and o-xylene (200.0mL) for 2 h. With EA and H2Treating the reaction mixture with MgSO4The water was removed, and the residue was distilled under reduced pressure. The crude product was applied to a sample having an MC: column chromatography of Hx afforded Compound H-57(7.3g, 45%) as a white solid.
mp 312 ℃, UV 344nm (in toluene), PL 427nm (in toluene), MS/EIMS 791
Example 3: preparation of Compound H-90
Figure BDA0000994466550000211
Preparation of Compound 3-1
In a flask 9-fluorenone (20.0g, 111.0mmol) was dissolved in THF (554.0mL) and phenylmagnesium bromide (36.9mL) was added slowly thereto at 0 ℃. The mixture was stirred at room temperature for 24 hours. After completion of the reaction, the organic layer was extracted with EA and purified by MgSO4Removing residual water and drying. The layers were separated by column chromatography to obtain compound 3-1(20.0g, 70%).
Preparation of Compound 3-2
2-bromo-9H-carbazole (20.0g, 81.2mmol), phenylboronic acid (11.9g, 97.5mmol), Pd (PPh) were stirred in a flask under reflux3)4(4.7g,4.06mmol)、2M K2CO3(121.0mL), toluene (250.0mL), and EtOH (121.0mL) for 5 hours. After completion of the reaction, the organic layer was extracted with EA and purified by MgSO4Removing residual water and drying. The layers were separated by column chromatography to obtain compound 3-2(17.0g, 86%).
Preparation of Compounds 3-3
Compound 3-2(17.0g, 70.0mmol), 1-iodo-3-bromobenzene (17.7mL, 140.0mmol), Cul (6.6g, 35.0mmol), K3PO4(44.5g, 210.0mmol), Ethylenediamine (EDA) (4.7mL, 70.0mmol) and toluene (350.0mL) were dissolved in the flask and refluxed at 120 ℃ for 5 hours. After completion of the reaction, the organic layer was extracted with EA and purified by MgSO4Removing residual waterDrying is carried out. The layers were separated by column chromatography to obtain compound 3-3(27.0g, 97%).
Preparation of Compounds 3-4
In a flask, compound 3-3(27.0g, 67.7mmol) and compound 3-1(17.5g, 67.7mmol) were dissolved in (522.0 mL). P in addition to methanesulfonic acid (MSA)2O5(0.04mL, 1.35mmol) then the mixture was stirred for 10 minutes. After completion of the reaction, NaHCO was added3(solution) and the organic layer was extracted with DCM. By using MgSO4The remaining water was removed to dry the organic layer and separated by column chromatography to obtain compound 3-4(40.0g, 95%).
Preparation of Compounds 3-5
In a flask were placed compound 3-4(15.0g, 23.4mmol), 2- (3-bromophenyl) -4, 6-diphenyl-1, 3, 5-triazine (6.6g, 25.74mmol), palladium (II) chloride (PdCl)2(PPh3)4) (659.0mg, 0.94mmol) and KOAc (10.0g, 102.9mmol) were dissolved in 1, 4-dioxane (156.0 mL). The mixture was stirred at 120 ℃ for 4 hours. After completion of the reaction, the organic layer was extracted with EA and purified by MgSO4Removing residual water and drying. The organic layer was separated via column chromatography to obtain compound 3-5(10.6g, 66%).
Preparation of Compound H-90
Compounds 3-5(10.6g, 15.4mmol), 2-chloro-4, 6-diphenyl-1, 3, 5-triazine (3.8g, 14.0mmol), Pd (PPh) were stirred in a flask at 120 deg.C3)4(820.0mg,0.77mmol)、2M K2CO3(60.0mL), EtOH (60.0mL), and toluene (180.0mL) for 5 hours. After completion of the reaction, the organic layer was extracted with EA and purified by MgSO4Removing residual water and drying. Compound H-90(4.0g, 32.7%) was obtained by recrystallization from EA and MeOH.
mp 256 ℃, UV 324nm (in toluene), PL 439nm (in toluene), MS/EIMS 790.95
Apparatus example 1: production of OLED devices Using organic electroluminescent Compounds according to the invention
An Organic Light Emitting Diode (OLED) device using the organic electroluminescent compound of the present invention was manufactured as follows: a transparent electrode Indium Tin Oxide (ITO) film (15. omega./sq) used on a glass substrate (Samsung Corning, Republic of Korea) of an OLED device was subjected to ultrasonic washing with trichloroethylene, acetone, ethanol, and distilled water in this order, and then stored in isopropyl alcohol1,N1′- ([1, 1' -biphenyl)]-4, 4' -diyl) bis (N)1- (Naphthalen-1-yl) -N4,N4Introduction of diphenylbenzene-1, 4-diamine into the unit of the vacuum vapor deposition apparatus and subsequent control of the pressure in the apparatus chamber to 10-6And (4) supporting. Subsequently, a current was applied to the cell to evaporate the introduced material, thereby forming a hole injection layer having a thickness of 60nm on the ITO substrate. Next, N ' -bis (4-biphenyl) -N, N ' -bis (4-biphenyl) -4, 4 ' -diaminobiphenyl was introduced into another unit of the vacuum vapor deposition apparatus, and a current was applied to the unit to evaporate the introduced material, thereby forming a hole transport layer having a thickness of 20nm on the hole injection layer. The compound H-34 is introduced as a host into one unit of the vacuum vapor deposition apparatus, and the compound D-1 is introduced as a dopant into the other unit. The two materials were evaporated at different ratios, and the dopant was deposited in a doping amount of 15 wt% based on the total weight of the host and the dopant, so that a light emitting layer having a thickness of 30nm was formed on the hole transport layer. Followed by reacting 2- (4- (9, 10-di (naphthalen-2-yl) anthracen-2-yl) phenyl) -1-phenyl-1H-benzo [ d]Imidazole is incorporated into one unit and quinolyl lithium is incorporated into the other unit. Both materials were evaporated at the same ratio and deposited at doping amounts of 50 wt%, respectively, to form an electron transport layer having a thickness of 30nm on the light emitting layer. Next, after quinolyl lithium having a thickness of 2nm was deposited as an electron injection layer on the electron transport layer, an Al cathode having a thickness of 150nm was deposited on the electron injection layer by another vacuum vapor deposition apparatus. Thereby, an OLED device was manufactured. For manufacturing OLED devicesMaterials were purified by vacuum sublimation at 10-6 torr prior to use.
The fabricated OLED device showed a current density of 3.32mA/cm at 2.5V2And a luminance of 1310cd/m2Green light emission of (2).
Apparatus example 2: production of OLED devices Using organic electroluminescent Compounds according to the invention
An OLED device was fabricated in the same manner as device example 1, but with the compound H-57 instead being used as the host in the light emitting material.
The fabricated OLED device showed a current density of 7.26mA/cm at 2.6V2And a luminance of 2840cd/m2Green light emission of (2).
Example apparatus 3: production of OLED devices Using organic electroluminescent Compounds according to the invention
An OLED device was fabricated in the same manner as device example 1, but with the compound H-90 instead being used as the host in the light emitting material.
The fabricated OLED device showed a current density of 9.40mA/cm at 2.7V2And has a luminance of 3910cd/m2Green light emission of (2).
Apparatus example 4: production of OLED devices Using organic electroluminescent Compounds according to the invention
An OLED device was fabricated in the same manner as device example 1, but with the compound H-15 instead being used as the host in the light emitting material.
The fabricated OLED device showed a current density of 2.45mA/cm at 2.6V2And a luminance of 890cd/m2Green light emission of (2).
Comparative example 1: fabrication of OLED devices using conventional light emitting materials
An OLED device was fabricated in the same manner as in device example 1, except that compound 1 was used as a host and compound D-86 was used as a dopant in the light emitting material instead.
The fabricated OLED device showed a current density of 5.20mA/cm at 4.3V2And has a brightness of1020cd/m2Green light emission of (2).
Figure BDA0000994466550000241
Compound 1
The organic electroluminescent compounds according to the present invention provide superior light emitting characteristics compared to conventional light emitting substances. In addition, the organic electroluminescent device using the organic electroluminescent compound of the present invention as a light emitting host material provides good light emitting characteristics and reduces driving voltage, thereby enhancing power efficiency and improving power consumption.

Claims (5)

1. An organic electroluminescent compound represented by the following formula 1:
Figure FDA0003027009620000011
wherein
A1Represents a substituted or unsubstituted triazinyl group;
wherein the substituents of the substituted triazinyl group are each independently a (C6-C30) aryl group;
L1represents a single bond or an unsubstituted phenylene group;
R1represents an unsubstituted (C6-C30) aryl group;
R2represents hydrogen, deuterium, or an unsubstituted (C6-C30) aryl group;
R3represents hydrogen or deuterium;
R4and R5Each independently represents hydrogen or deuterium;
a. c and d each independently represent an integer of 1 to 4; wherein a, c or d is an integer of 2 or more, each R2、R4Or R5The same or different;
b represents an integer of 1 to 3; wherein b is an integer of 2 or greater, each R3The same or different;
n represents an integer of 0 or 1;
m represents an integer of 1.
2. The organic electroluminescent compound according to claim 1, wherein the compound of formula 1 is represented by the following formula 3, 4 or 5:
Figure FDA0003027009620000012
Figure FDA0003027009620000021
wherein
A1、L1、R1To R5A, b, c, d, m and n are as defined in claim 1.
3. The organic electroluminescent compound according to claim 1, wherein R is1Represents a (C6-C20) aryl group; r2Represents hydrogen, deuterium, or (C6-C20) aryl.
4. An organic electroluminescent compound selected from the group consisting of:
Figure FDA0003027009620000022
Figure FDA0003027009620000031
5. an organic electroluminescent device comprising the organic electroluminescent compound according to claim 1.
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