Host materials and organic electroluminescent device including the same

Abstract

To provide an organic electroluminescent device that can exhibit excellent life characteristics while maintaining high luminous efficiency.SOLUTION: A plurality of host materials include at least one first host compound and at least one second host compound, wherein the first host compound is represented by the following formula 2, and the second host compound is represented by a specific formula.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a number of host materials and organic electroluminescent devices containing the same. [Background technology]

[0002] Electroluminescent devices (EL devices) are self-emitting display devices that have the advantages of providing wider viewing angles, greater contrast ratios, and faster response times. The first organic EL device was developed by Eastman Kodak in 1987 using small aromatic diamine molecules and aluminum complexes as materials for forming the light-emitting layer (see Appl. Phys. Lett. 51, 913, 1987).

[0003] Organic light-emitting devices (OLEDs) convert electrical energy into light by applying electricity to organic electroluminescent materials and typically include an anode, a cathode, and organic layers formed between the two electrodes. The organic layers of an organic EL device may include a hole-injection layer, a hole-transport layer, an electron-blocking layer, an emitting layer (containing a host material and a dopant material), an electron buffer layer, a hole-blocking layer, an electron-transport layer, an electron-injection layer, etc. Materials used in the organic layers can be classified according to their functions as hole-injection materials, hole-transport materials, electron-blocking materials, emitting materials, electron buffer materials, hole-blocking materials, electron-transport materials, electron-injection materials, etc. In organic EL devices, application of a voltage causes holes from the anode and electrons from the cathode to be injected into the emitting layer, and recombination of the holes and electrons generates high-energy excitons. When an organic light-emitting compound returns from an excited state to its ground state, it transitions to an excited state by the energy and emits light from the energy.

[0004] The most important factor determining the luminous efficiency of an organic EL device is the emitting material. Emitting materials are required to have high quantum efficiency, high electron and hole mobility, and uniformity and stability of the formed emitting material layer. Emitting materials are classified into blue, green, and red emitting materials based on the emitting color, and further include yellow and orange emitting materials. Emitting materials are further classified into host materials and dopant materials based on their functionality. In recent years, the development of organic EL devices with high efficiency and long lifetimes has become an urgent issue. In particular, considering the EL characteristics required for medium- and large-sized OLED panels, the development of superior emitting materials that surpass conventional materials is urgently needed. To this end, as a solid-state solvent and energy transmitter, the host material preferably has high purity and a suitable molecular weight for vacuum deposition. Furthermore, the host material is required to have high glass transition temperature and thermal decomposition temperature to achieve thermal stability, high electrochemical stability to achieve long lifetimes, easy formability of amorphous thin films, good adhesion to adjacent layers, and no interlayer migration.

[0005] The combination of a host and a dopant can be used as an emitting material to improve color purity, luminous efficiency, and stability. Generally, EL devices with excellent properties have a structure including an emitting layer formed by doping a dopant into a host. When using such a dopant / host material system as an emitting material, the host material has a significant influence on the efficiency and lifespan of the EL device, so the selection of the host material is important.

[0006] Japanese Patent Application Laid-Open No. 2001-23777 discloses an organic electroluminescent device using a compound in which a nitrogen-containing five-membered heteroaryl is fused to a middle benzene ring of a phenanthrene skeleton as a host material. The organic electroluminescent device containing the compound disclosed in the document exhibits excellent blue color purity. However, the document does not disclose a mixed structure of the phosphorescent light-emitting layer, and further improvements in driving voltage, current efficiency, and driving life are needed. Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present disclosure is to provide an organic electroluminescent device that has a long lifetime while maintaining high luminous efficiency. [Means for solving the problem]

[0008] As a result of intensive research to solve the above technical problems, the present inventors have found that the above-mentioned object can be achieved by a plurality of host materials including at least one first host compound represented by the following Formula 1 or 2 and at least one second host compound represented by the following Formula 3, and have completed the present invention. [ka] (In the formula, X1 represents -N=, -NR7-, -O- or -S-; Y1 represents -N=, -NR8-, -O- or -S-, provided that when X1 represents -N=, Y1 represents -NR8-, -O- or -S-, and when X1 represents -NR7-, Y1 represents -N=, -O- or -S-; R1 represents a substituted or unsubstituted (C6-C30) aryl or a substituted or unsubstituted (3-30 membered) heteroaryl; R2 to R8 each independently represent hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1 to C30) alkyl, substituted or unsubstituted (C6 to C30) aryl, substituted or unsubstituted (3 to 30 membered) heteroaryl, substituted or unsubstituted (C3 to C30) cycloalkyl, substituted or unsubstituted (C1 to C30) alkoxy, substituted or unsubstituted tri(C1 to C30) alkylsilyl, substituted or unsubstituted di(C1 to C30) alkyl(C6 to C30) arylsilyl, substituted or unsubstituted (C1 to C30) alkyldi(C6 to C30) arylsilyl, substituted or represents unsubstituted tri(C6-C30)arylsilyl, substituted or unsubstituted mono- or di-(C1-C30)alkylamino, substituted or unsubstituted mono- or di-(C6-C30)arylamino, or substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino, or can be combined with adjacent substituents to form a substituted or unsubstituted (C3-C30)monocyclic or polycyclic, alicyclic, or aromatic ring, and these carbon atoms may be replaced by at least one heteroatom selected from nitrogen, oxygen, and sulfur; L1 represents a single bond, a substituted or unsubstituted (C6 to C30) arylene, or a substituted or unsubstituted (3 to 30-membered) heteroarylene; a represents 1, b and c each independently represent 1 or 2, and d and e each independently represent an integer of 1 to 4, Heteroaryl(ene) contains at least one heteroatom selected from B, N, O, S, Si, and P. [ka] (In the formula, X 11 -N=, -NR 17 represents -, -O- or -S-; Y 11 -N=, -NR 18 represents -, -O- or -S-, provided that X 11 When represents -N=, Y 11 is -NR 18 represents -, -O- or -S-, and X 11 Ga-NR 17 - When expressing Y 11represents -N=, -O- or -S-; X represents N or CH; R 11 represents a substituted or unsubstituted (C6-C30) aryl or a substituted or unsubstituted (3-30 membered) heteroaryl; R 12 ~R 18 are each independently hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-30 membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri(C1-C30) alkylsilyl, substituted or unsubstituted di(C1-C30) alkyl(C6-C30) arylsilyl, substituted or unsubstituted (C1-C30) alkyldi(C6-C30) arylsilyl, substituted or unsubstituted represents a substituted tri(C6-C30)arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)alkylamino, a substituted or unsubstituted mono- or di-(C6-C30)arylamino, or a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino, or can be combined with adjacent substituents to form a substituted or unsubstituted (C3-C30)monocyclic or polycyclic, alicyclic, or aromatic ring, and these carbon atoms may be replaced by at least one heteroatom selected from nitrogen, oxygen, and sulfur; L2 represents a single bond, a substituted or unsubstituted (C6 to C30) arylene, or a substituted or unsubstituted (3 to 30-membered) heteroarylene; a' represents 1, b' and c' each independently represent 1 or 2, and d' represents an integer of 1 to 4, Heteroaryl(ene) contains at least one heteroatom selected from B, N, O, S, Si, and P.

[0009] Advantageous Effects of the Invention The phenanthroxazole-based and phenanthrothiazole-based compounds of the present disclosure inherently possess high electronegativity and electron-rich groups, and have rigid properties due to the condensation structure of phenanthrene and oxazole, or phenanthrene and thiazole, etc., which facilitate intermolecular charge transfer. Furthermore, when such intermolecular stacking is strengthened, horizontal molecular orientation is easily introduced, thereby enabling fast electron current characteristics to be introduced. Therefore, by using limited structures such as triazine and pyrimidine derivatives as light-emitting materials, it is possible to provide organic electroluminescent devices that exhibit relatively low driving voltages by improving current efficiency, power efficiency, and interface properties such as high-purity color and excellent luminous efficiency while maintaining the intermolecular stacking effect together with the electron transport layer.

[0010] Furthermore, when an emissive material is used that combines a hole-type amine substituted with a phenanthroxazole-based compound and a phenanthrothiazole-based compound as a first host and an electron-type azine material substituted with a phenanthroxazole-based compound and a phenanthrothiazole-based compound as a second host, an organic electroluminescent device with high efficiency, long lifetime, and fast driving voltage can be implemented. Generally, when a phosphorescent emissive material is substituted with other substituents, such as a carbazole-based derivative with a high dihedral angle, the driving voltage increases due to the blockage of electronic current and the efficiency decreases. However, when the emissive compound according to the present disclosure is used, an organic electroluminescent device with a relatively low driving voltage and excellent luminous efficiency, such as current efficiency, power efficiency, and high-purity color, can be manufactured by improving the interfacial properties through fast current injection characteristics and improved intermolecular stacking and interaction. [Brief explanation of the drawings]

[0011] [Figure 1] 1 shows the current efficiency as a function of luminance of the organic electroluminescent devices fabricated in Comparative Example 2 and Device Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present disclosure will be described in detail below. However, the following description is intended to explain the present disclosure and is not intended to limit the scope of the present disclosure in any way.

[0013] The organic electroluminescent devices comprising the organic electroluminescent compounds represented by the above formulas 1, 2, or 3 are described in more detail below.

[0014] In the above formulas 1 and 2, X1 represents -N=, -NR7-, -O-, or -S-, and Y1 represents -N=, -NR8-, -O-, or -S-, provided that when X1 represents -N=, Y1 represents -NR8-, -O-, or -S-, and when X1 represents -NR7-, Y1 represents -N=, -O-, or -S-. According to one embodiment of the present disclosure, one of X1 and Y1 can be -N=, and the other can be -NR7-, -O-, or -S-. Furthermore, according to another embodiment of the present disclosure, one of X1 and Y1 can be -N=, and the other can be -O- or -S-. Here, both X1 and Y1 cannot represent -O- or -S-, and when either X1 or Y1 can be -O-, the other cannot be -S-. For example, X1 can be -N= and Y1 can be -O-, X1 can be -O- and Y1 can be -N=, or X1 can be -S- and Y1 can be -N=.

[0015] In the above formulas 1 and 2, R1 represents a substituted or unsubstituted (C6-C30) aryl or a substituted or unsubstituted (3-30 membered) heteroaryl, preferably a substituted or unsubstituted (C6-C30) aryl or a substituted or unsubstituted (5-25 membered) heteroaryl, more preferably a substituted or unsubstituted (C6-C30) aryl or a substituted or unsubstituted (5-20 membered) heteroaryl, and may be, for example, unsubstituted phenyl, unsubstituted biphenyl, unsubstituted naphthyl, methyl-substituted fluorenyl, methyl-substituted benzofluorenyl, unsubstituted dibenzofuranyl, unsubstituted dibenzothiophenyl, spiro[fluorene-fluoren]yl, or spiro[fluorene-benzofluoren]yl.

[0016] In the above formulas 1 and 2, R2 to R6 each independently represent hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-30 membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri(C1-C30) alkylsilyl, substituted or unsubstituted di(C1-C30) alkyl(C6-C30) arylsilyl, substituted or unsubstituted (C1-C30) alkyldi(C6-C3 or (C1-C30)arylsilyl, substituted or unsubstituted tri(C6-C30)arylsilyl, substituted or unsubstituted mono- or di-(C1-C30)alkylamino, substituted or unsubstituted mono- or di-(C6-C30)arylamino, or substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino, or may combine with adjacent substituents to form a substituted or unsubstituted (C3-C30)monocyclic or polycyclic, alicyclic, or aromatic ring, and these carbon atoms may be bonded to at least one heteroatom selected from nitrogen, oxygen, and sulfur. Preferably, each independently represents hydrogen, a substituted or unsubstituted (C6-C25) aryl, a substituted or unsubstituted (3-25 membered) heteroaryl, or a substituted or unsubstituted mono- or di-(C6-C25) arylamino, or can combine with adjacent substituents to form a substituted or unsubstituted (C3-C25) monocyclic or polycyclic, alicyclic, or aromatic ring, and these carbon atoms may be replaced by at least one heteroatom selected from nitrogen, oxygen, and sulfur, more preferably, each independently represents hydrogen, a substituted or unsubstituted (C6-C25) aryl, a substituted or unsubstituted (3-25 membered) heteroaryl, or a substituted or unsubstituted mono- or di-(C6-C25) arylamino, or can combine with adjacent substituents to form a substituted or unsubstituted (C3-C25) monocyclic or polycyclic, alicyclic, or aromatic ring, and these carbon atoms may be replaced by at least one heteroatom selected from nitrogen, oxygen, and sulfur, and more preferably, each independently represents represents hydrogen, substituted or unsubstituted (C6-C20) aryl, substituted or unsubstituted (5-25 membered) heteroaryl, substituted or unsubstituted di(C6-C18) arylamino, or can be combined with adjacent substituents to form a substituted or unsubstituted (C3-C25) monocyclic or polycyclic, alicyclic, or aromatic ring, wherein these carbon atoms may be replaced with at least one heteroatom selected from nitrogen and oxygen, and the heteroaryl may contain at least one heteroatom selected from B, N, O, S, Si, and P.For example, R5 and R6 can each independently be substituted or unsubstituted phenyl, substituted or unsubstituted m-biphenyl, substituted or unsubstituted p-biphenyl, substituted or unsubstituted fluorenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted phenanthrenyl, or substituted or unsubstituted benzofluorenyl.

[0017] In the above formulas 1 and 2, a represents 1 or 2, preferably 1; b and c each independently represent 1 or 2, preferably 1; d and e each independently represent an integer of 1 to 4, preferably 1 or 2.

[0018] In the above formulas 1 and 2, L1 represents a single bond, a substituted or unsubstituted (C6 to C30) arylene, or a substituted or unsubstituted (3 to 30-membered) heteroarylene, preferably a single bond or a substituted or unsubstituted (C6 to C18) arylene, more preferably a single bond or an unsubstituted (C6 to C12) arylene, and may be, for example, a single bond or unsubstituted phenylene.

[0019] The compound represented by formula 1 or 2 is represented by any one of the following formulas 1-1 to 1-5: [ka]

[0020] In the above formulas 1-1 to 1-5, R1 to R6, L1 and a to e are as defined in formulas 1 and 2.

[0021] In the above formula 3, X 11 -N=, -NR 17 represents -, -O- or -S-; Y 11 -N=, -NR 18 represents -, -O- or -S-, provided that X 11 When represents -N=, Y 11 is -NR 18 represents -, -O- or -S-, and X 11 Ga-NR 17 - When expressing Y 11represents -N=, -O- or -S-. According to one embodiment of the present disclosure, X 11 and Y 11 One of them can be -N= and the other can be -NR 17 Further, according to another embodiment of the present disclosure, X 11 and Y 11 One of X may be -N= and the other may be -O- or -S-. 11 and Y 11 cannot both represent -O- or -S-, and when either X1 or Y1 can be -O-, the other cannot be -S-.

[0022] In the above formula 3, R 11 represents a substituted or unsubstituted (C6-C30) aryl or a substituted or unsubstituted (3-30 membered) heteroaryl, preferably a substituted or unsubstituted (C6-C30) aryl or a substituted or unsubstituted (5-25 membered) heteroaryl, more preferably a substituted or unsubstituted (C6-C30) aryl or a substituted or unsubstituted (5-20 membered) heteroaryl, and can be, for example, unsubstituted phenyl, unsubstituted biphenyl, unsubstituted naphthyl, fluorenyl substituted with methyl, substituted or unsubstituted carbazolyl, benzofluorenyl substituted with methyl, unsubstituted dibenzofuranyl, unsubstituted dibenzothiophenyl, unsubstituted benzonaphthofuranyl, spiro[fluorene-fluoren]yl, or spiro[fluorene-benzofluoren]yl.

[0023] In the above formula 3, R 12 ~R 18are each independently hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-30 membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri(C1-C30) alkylsilyl, substituted or unsubstituted di(C1-C30) alkyl(C6-C30) arylsilyl, substituted or unsubstituted (C1-C30) alkyldi(C6-C30) arylsilyl, substituted or unsubstituted tri(C6-C30)arylsilyl, substituted or unsubstituted mono- or di-(C1-C30)alkylamino, substituted or unsubstituted mono- or di-(C6-C30)arylamino, or substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino, or can combine with adjacent substituents to form a substituted or unsubstituted (C3-C30)monocyclic or polycyclic, alicyclic, or aromatic ring, and these carbon atoms are replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur. Preferably, each independently represents hydrogen, a substituted or unsubstituted (C6-C25) aryl, a substituted or unsubstituted (3-25 membered) heteroaryl, or a substituted or unsubstituted mono- or di-(C6-C25) arylamino, or may combine with adjacent substituents to form a substituted or unsubstituted (C3-C25) monocyclic or polycyclic, alicyclic, or aromatic ring, and these carbon atoms may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur, and more preferably, each independently represents represents hydrogen, substituted or unsubstituted (C6-C20) aryl, substituted or unsubstituted (5-25 membered) heteroaryl, substituted or unsubstituted di(C6-C18) arylamino, or can be combined with adjacent substituents to form a substituted or unsubstituted (C3-C25) monocyclic or polycyclic, alicyclic, or aromatic ring, wherein these carbon atoms may be replaced with at least one heteroatom selected from nitrogen and sulfur, and heteroaryl contains at least one heteroatom selected from B, N, O, S, Si, and P. For example, R 15 and R 16may each independently be selected from the group consisting of substituted or unsubstituted phenyl, substituted or unsubstituted o-biphenyl, substituted or unsubstituted m-biphenyl, substituted or unsubstituted p-biphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted fluorenyl, substituted or unsubstituted carbazolyl, substituted or unsubstituted dibenzothiophenyl, substituted or unsubstituted benzofluorenyl, substituted or unsubstituted benzocarbazole, and substituted or unsubstituted benzonaphthothiophene.

[0024] In the above formula 3, a' represents 1 or 2, preferably 1; b' and c' each independently represent 1 or 2, preferably 1; and d' represents an integer of 1 to 4, preferably 1 or 2.

[0025] In the above formula 3, X represents N or CH.

[0026] In the above formula 3, L2 represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted (3- to 30-membered) heteroarylene, preferably a single bond, a substituted or unsubstituted (C6-C18) arylene, more preferably a single bond, an unsubstituted (C6-C12) arylene, and can be, for example, a single bond or unsubstituted phenylene.

[0027] The compound represented by formula 3 is represented by any one of the following formulas 3-1 to 3-6: [ka]

[0028] In the above formulas 3-1 to 3-6, R 11 ~R 18 , L2, X, and a' to d' are as defined in Formula 3.

[0029] In this specification, "(C1-C30) alkyl" refers to straight-chain or branched alkyl having 1 to 30 carbon atoms constituting the chain (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, etc. "(C2-C30) alkenyl" refers to straight-chain or branched alkenyl having 2 to 30 carbon atoms constituting the chain (the number of carbon atoms is preferably 2 to 20, more preferably 2 to 10), and includes vinyl, 1-propenyl, 2-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-methylbut-2-enyl, etc. The term "(C2-C30)alkynyl" refers to a straight-chain or branched alkynyl having 2 to 30 carbon atoms (preferably 2 to 20, more preferably 2 to 10) constituting the chain, and includes ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-methylpent-2-ynyl, etc. The term "(C3-C30)cycloalkyl" refers to a monocyclic or polycyclic hydrocarbon having 3 to 30 skeletal carbon atoms (preferably 3 to 20, more preferably 3 to 7 carbon atoms), and includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc. The term "(3- to 7-membered)heterocycloalkyl" refers to a cycloalkyl having 3 to 7, preferably 5 to 7, skeletal atoms containing at least one heteroatom selected from the group consisting of B, N, O, S, Si, and P, preferably O, S, and N, and includes tetrahydrofuran, pyrrolidine, thiolane, tetrahydropyran, etc. The term "(C6-C60)aryl(ene)" refers to a monocyclic or fused ring group derived from an aromatic hydrocarbon having 6 to 60 ring carbon atoms (preferably 6 to 30, more preferably 6 to 20 ring carbon atoms), which may be partially saturated or may contain a spiro structure.Examples of the aryl include phenyl, biphenyl, terphenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, fluorenyl, phenylfluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthrenyl, phenylphenanthrenyl, anthracenyl, indenyl, triphenylethylenyl, pyrenyl, tetracenyl, perylenyl, chrysenyl, naphthacenyl, and fluoranthenyl. The term "(3- to 30-membered)heteroaryl (heteroarylene)" refers to an aryl having 3 to 30 ring skeletal atoms and containing at least one, preferably 1 to 4, heteroatoms selected from the group consisting of B, N, O, S, Si, and P. The heteroaryl may be a monocyclic ring or a fused ring fused with at least one benzene ring, may be partially saturated, and may be formed by bonding at least one heteroaryl or aryl group to the heteroaryl group via a single bond. Heteroaryl includes monocyclic heteroaryls such as furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, and the like, and condensed ring heteroaryls such as benzofuranyl, benzothiophenyl, isobenzofuranyl, dibenzofuranyl, dibenzothiophenyl, benzimidazolyl, benzothiazolyl, benzisothiazolyl, benzisoxazolyl, benzoxazolyl, isoindolyl, indolyl, benzoindolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, quinazolinyl, quinoxalinyl, naphthyridyl, carbazolyl, phenoxazinyl, phenanthridinyl, benzodioxolyl, and the like.The term "nitrogen-containing (5- to 30-membered) heteroaryl" refers to an aryl group having at least one N and 5 to 30 ring skeletal atoms (the number of ring skeletal atoms is preferably 5 to 20, more preferably 5 to 15), preferably 1 to 4 heteroatoms. The aryl group may be a monocyclic ring or a fused ring fused with at least one benzene ring, and may be partially saturated. The fused ring may be formed by bonding at least one heteroaryl or aryl group to a heteroaryl group via a single bond. The fused ring includes monocyclic heteroaryls such as pyrrolyl, imidazolyl, pyrazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, pyridyl, pyrazinyl, pyrimidinyl, and pyridazinyl, and fused ring heteroaryls such as benzimidazolyl, isoindolyl, indolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, quinazolinyl, quinoxalinyl, carbazolyl, and phenanthridinyl. "Halogen" includes F, Cl, Br, and I.

[0030] Furthermore, the term "substituted" in the expression "substituted or unsubstituted" means that a hydrogen atom in a specific functional group is replaced with another atom or another functional group (i.e., a substituent). 11 ~R 18In L1 and L2, the substituents of the substituted alkyl, substituted alkoxy, substituted cycloalkyl, substituted aryl(ene), substituted heteroaryl(ene), substituted trialkylsilyl, substituted triarylsilyl, substituted dialkylarylsilyl, substituted alkyldiarylsilyl, substituted mono- or di-alkylamino, substituted mono- or di-arylamino, substituted alkylarylamino, and substituted monocyclic or polycyclic ring, alicyclic ring, or aromatic ring are each independently deuterium; halogen; cyano; carboxyl; nitro; hydroxy; (C1-C30) alkyl; alkyl; halo(C1-C30)alkyl;(C2-C30)alkenyl;(C2-C30)alkynyl;(C1-C30)alkoxy;(C1-C30)alkylthio;(C3-C30)cycloalkyl;(3-7 membered)heterocycloalkyl;(C6-C30)aryloxy;(C6-C30)arylthio;(C6-C30)aryl- or di(C6-C30)arylamino-substituted or unsubstituted (3-30 membered)heteroaryl; cyano-, (3-30 membered)heteroaryl-, or tri(C6-C30)arylsilyl-substituted or unsubstituted (C6-C30) Aryl;Tri(C1-C30)alkylsilyl;Tri(C6-C30)arylsilyl;Di(C1-C30)alkyl(C6-C30)arylsilyl;(C1-C30)alkyldi(C6-C30)arylsilyl;Amino;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;Di(C6-C30)arylboro at least one selected from the group consisting of di(C1-C30)alkylboronyl; (C1-C30)alkyl(C6-C30)arylboronyl; (C6-C30)ar(C1-C30)alkyl; and (C1-C30)alkyl(C6-C30)aryl, preferably each independently selected from (C1-C20)alkyl; (C6-C18)aryl-substituted or unsubstituted (3-25 membered)heteroaryl; cyano-, tri(C6-C18)arylsilyl-, or (3-20 membered)heteroaryl-, substituted or unsubstituted (C6-C20)aryl;At least one selected from the group consisting of tri(C6-C18)arylsilyl; and (C1-C20)alkyl(C6-C20)aryl;

[0031] Compounds represented by formula 1 or 2 may more specifically be represented by, but are not limited to, the following compounds: [ka] [ka]

[0032] The compound represented by formula 3 may more specifically be represented by, but is not limited to, the following compounds: [ka] [ka] [ka] [ka]

[0033] The organic electroluminescent device according to the present disclosure includes an anode, a cathode, and at least one organic layer between the anode and the cathode. The organic layer includes an emissive layer including a host and a phosphorescent dopant. The host includes a plurality of host compounds, at least a first host compound of the plurality of host compounds being represented by Formula 1 or 2 above, and a second host compound being represented by Formula 3 above.

[0034] In the present disclosure, the light-emitting layer is a layer that emits light, and can be a single layer or a multi-layer structure in which two or more layers are stacked. In the light-emitting layer, the doping concentration of the dopant compound based on the host compound is preferably less than 20 wt%.

[0035] The organic layer may include an emitting layer, and may further include at least one layer selected from a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, an intermediate layer, a hole blocking layer, and an electron blocking layer.

[0036] In the organic electroluminescent device of the present disclosure, the weight ratio of the first host compound to the second host compound ranges from 1:99 to 99:1.

[0037] The dopant that is included in the organic electroluminescent device according to the present disclosure is preferably at least one phosphorescent dopant.The phosphorescent dopant material that is included in the organic electroluminescent device according to the present invention is not particularly limited, but can be preferably selected from iridium (Ir), osmium (Os), copper (Cu) and platinum (Pt) metallized complex compounds, more preferably selected from iridium (Ir), osmium (Os), copper (Cu) and platinum (Pt) ortho-metallized complex compounds, and even more preferably can be ortho-metallized iridium complex compounds.

[0038] Dopants included in the organic electroluminescent devices of the present disclosure can include, but are not limited to, compounds represented by the following formula 101: [ka] wherein L is structure 1 or 2: [ka] Selected from R 100 ~R 103 each independently represents hydrogen, deuterium, halogen, halogen-substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C6-C30) aryl, cyano, substituted or unsubstituted (3-30 membered) heteroaryl, or substituted or unsubstituted (C1-C30) alkoxy; or R 100 ~R 103may be combined with adjacent substituents to form a substituted or unsubstituted fused ring, for example, a substituted or unsubstituted quinoline, a substituted or unsubstituted benzofuropyridine, a substituted or unsubstituted benzothienopyridine, a substituted or unsubstituted indenopyridine, a substituted or unsubstituted benzofuroquinoline, a substituted or unsubstituted benzothienoquinoline, or a substituted or unsubstituted indenoquinoline; R 104 ~R 107 each independently represents hydrogen, deuterium, halogen, halogen-substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-30 membered) heteroaryl, cyano, or substituted or unsubstituted (C1-C30) alkoxy; or R 104 ~R 107 may be combined with adjacent substituents to form a substituted or unsubstituted fused ring, for example, substituted or unsubstituted naphthyl, substituted or unsubstituted fluorene, substituted or unsubstituted dibenzothiophene, substituted or unsubstituted dibenzofuran, substituted or unsubstituted indenopyridine, substituted or unsubstituted benzofuropyridine, or substituted or unsubstituted benzothienopyridine; R 201 ~R 211 each independently represents hydrogen, deuterium, halogen, halogen-substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C6-C30) aryl; or R 201 ~R 211 may be bonded to adjacent substituents to form a substituted or unsubstituted fused ring; and n represents an integer of 1 to 3.

[0039] Specific examples of dopant materials include: [ka] [ka] [ka] [ka]

[0040] The organic electroluminescent device of the present disclosure may further comprise at least one compound selected from the group consisting of arylamine-based compounds and styrylarylamine-based compounds in the organic layer.

[0041] Furthermore, in the organic electroluminescent device of the present disclosure, the organic layer may further comprise at least one metal selected from the group consisting of Group 1 metals, Group 2 metals, Group 4 transition metals, Group 5 transition metals, lanthanides of the d-transition elements of the periodic table, and organometallics, and at least one complex compound containing the aforementioned metals.

[0042] In the organic electroluminescent device of the present disclosure, it may be preferable to dispose at least one layer selected from a chalcogenide layer, a metal halide layer, and a metal oxide layer (hereinafter referred to as a "surface layer") on the inner surface of one or both electrodes. Specifically, it is preferable to dispose a silicon or aluminum chalcogenide (including oxide) layer on the anode surface of the electroluminescent medium layer, and it is preferable to dispose a metal halide or metal oxide layer on the cathode surface of the electroluminescent medium layer. Such a surface layer can provide operational stability to the organic electroluminescent device. Preferably, the chalcogenide is SiO X (1≦X≦2), AlO X (1≦X≦1.5), SiON, SiAlON, etc., the aforementioned metal halides include LiF, MgF2, CaF2, rare earth metal fluorides, etc., and the aforementioned metal oxides include Cs2O, Li2O, MgO, SrO, BaO, CaO, etc.

[0043] A layer selected from a hole injection layer, a hole transport layer, an electron blocking layer, or a combination thereof may be used between the anode and the light-emitting layer. The hole injection layer may be formed from multiple layers to lower the hole injection barrier (or hole injection voltage) from the anode to the hole transport layer or the electron blocking layer. Two compounds may be used simultaneously in each layer. The hole transport layer or the electron blocking layer may also be formed from multiple layers.

[0044] A layer selected from an electron buffer layer, a hole blocking layer, an electron transport layer, an electron injection layer, or a combination thereof may be used between the light-emitting layer and the cathode. The electron buffer layer may be formed of multiple layers to control electron injection and improve the interface properties between the light-emitting layer and the electron injection layer. Two compounds may be used simultaneously in each layer. The hole blocking layer or the electron transport layer may also be formed of multiple layers, and each layer may contain two or more compounds.

[0045] Furthermore, in the organic electroluminescent device of the present disclosure, a mixed region of an electron transport compound and a reductive dopant or a mixed region of a hole transport compound and an oxidative dopant is preferably disposed on the surface of at least one of a pair of electrodes. In this case, the electron transport compound is reduced to an anion, which facilitates the injection and transport of electrons from the mixed region to the electroluminescent medium. Furthermore, the hole transport compound is oxidized to a cation, which facilitates the injection and transport of holes from the mixed region to the electroluminescent medium. Preferably, the oxidative dopant includes various Lewis acids and acceptor compounds, and the reductive dopant includes alkali metals, alkali metal compounds, alkaline earth metals, rare earth metals, and mixtures thereof. Using the reductive dopant layer as a charge generation layer, an organic electroluminescent device having two or more light-emitting layers and emitting white light can be prepared.

[0046] To form each layer of the organic electroluminescent device of the present disclosure, dry deposition methods such as vacuum deposition, sputtering, plasma and ion plating, or wet deposition methods such as inkjet printing, nozzle printing, slot coating, spin coating, dip coating and flow coating can be used.

[0047] When a wet film-forming method is used, a thin film can be formed by dissolving or diffusing the materials for forming each layer in any appropriate solvent such as ethanol, chloroform, tetrahydrofuran, dioxane, etc. The solvent can be any solvent as long as it can dissolve or diffuse the materials for forming each layer and does not cause any problems in film-forming ability.

[0048] Additionally, the first and second host compounds of the present disclosure can be co-vaporized or mixed-vaporized.

[0049] The organic electroluminescent devices of the present disclosure can be used to manufacture display systems or lighting systems.

[0050] Hereinafter, the organic electroluminescent compound according to the present disclosure, the preparation method thereof, and the luminescent properties of the organic electroluminescent device containing the same will be described in detail with respect to the representative compound of the present disclosure in order to understand the present disclosure in detail.

[0051] Example 1: Preparation of Compound H1-1 [ka] Compound 1-1 (4 g, 12 mmol), bis(biphenyl-4-yl)[4-(4,4,5,5-tetramethyl-[1,3,2]-dioxaboran-2-yl)phenyl]amine (6.8 g, 13 mmol), palladium(II) acetate (0.3 g, 1 mmol), 2-dicyclohexylphosphino-2',6'-dimethoxybiphenyl (0.9 g, 2 mmol), cesium carbonate (11.5 g, 35 mmol), 60 mL of o-xylene, 15 mL of ethanol, and 15 mL of distilled water were added to a reactor and refluxed for 3 hours. After completion of the reaction, the organic layer was washed with distilled water and extracted with ethyl acetate. The organic layer was then dried over magnesium sulfate. The solvent was removed using a rotary evaporator, and the resulting product was purified by column chromatography to obtain compound H1-1 (2.2 g, yield: 27%).

[0052] [Table 1]

[0053] Example 2: Preparation of Compound H1-42 [ka] Compound 2-1 (4.8 g, 11.34 mmol), N-(4-bromophenyl)-N-phenyl-[1,1'-biphenyl]-4-amine (5 g, 12.47 mmol), tetrakis(triphenylphosphine)palladium (0.4 g, 0.34 mmol), sodium carbonate (3.0 g, 28.35 mmol), 57 mL of toluene, 14 mL of ethanol, and 14 mL of distilled water were added to a reactor and stirred at 120 °C for 4 hours. After the reaction was completed, methanol was added dropwise to the mixture, and the resulting solid was filtered. The resulting solid was purified and recrystallized by column chromatography to obtain compound H1-42 (1.4 g, yield: 20.0%).

[0054] [Table 2]

[0055] Example 3: Preparation of Compound H1-27 [ka] Compound 3-1 (4.5 g, 16.09 mmol), 9,9-dimethyl-N-phenyl-9H-fluoren-2-amine (5.5 g, 19.31 mmol), palladium(II) acetate (0.2 g, 0.80 mmol), tri-t-butylphosphine (0.8 mL, 1.60 mmol), sodium tert-butoxide (2.3 g, 24.14 mmol), and 80 mL of o-xylene were added to a reactor and refluxed at 120 °C for 2 hours. After completion of the reaction, the mixture was cooled to room temperature, and the resulting solid was filtered and washed with ethyl acetate. The filtrate was distilled under reduced pressure, and the resulting solid was purified and recrystallized by column chromatography to give compound H1-27 (2.4 g, yield: 28%).

[0056] [Table 3]

[0057] Example 4: Preparation of Compound H2-1 [ka] Compound 2-1 (10 g, 23.7 mmol), 2-chloro-4,6-diphenyltriazine (CAS: 3842-55-5, 5.8 g, 21.6 mmol), tetrakis(triphenylphosphine)palladium (1.2 g, 1.0 mmol), potassium carbonate (7.5 g, 59 mmol), 90 mL of toluene, 30 mL of ethanol, and 30 mL of distilled water were added to a reactor and stirred at 120 °C for 4 hours. After the reaction was completed, methanol was added dropwise to the mixture, and the resulting solid was filtered. The resulting solid was purified and recrystallized by column chromatography to obtain compound H2-1 (5.7 g, yield: 50%).

[0058] [Table 4]

[0059] Example 5: Preparation of Compound H2-2 [ka] Compound 2-1 (3.48 g, 8.3 mmol), 2-([1,1'-biphenyl]-4-yl)-4-chloro-6-phenyl-1,3,5-triazine (CAS: 1472062-94-4, 3.53 g, 9.1 mmol), tetrakis(triphenylphosphine)palladium (0.48 g, 0.41 mmol), sodium carbonate (2.2 g, 20.7 mmol), 28 mL of toluene, 7 mL of ethanol, and 7 mL of distilled water were added to a reactor and stirred at 120 °C for 5 hours. After the reaction was completed, methanol was added dropwise to the mixture, and the resulting solid was filtered. The resulting solid was purified and recrystallized by column chromatography to obtain compound H2-2 (3.7 g, yield: 74%).

[0060] [Table 5]

[0061] The LUMO (Lowest Unoccupied Molecular Orbital) energies, HOMO (Highest Occupied Molecular Orbital) energies, and triplet energies of compounds H1-1 and H1-27 synthesized in Examples 1 and 3 above were calculated using density functional theory (DFT) at the B3LYP / 6-31g(d) level and are shown in Table 1 below.

[0062] Generally, the LUMO and HOMO energy values ​​measured as described above have negative values; however, for convenience, they are expressed as absolute values. Furthermore, when comparing the magnitudes of the LUMO / HOMO energy values, it is their absolute values ​​that are compared.

[0063] [Table 6]

[0064] Referring to Table 1 above, the device characteristics of the first host compounds according to one embodiment, i.e., compound H1-1 represented by Formula 1 and compound H1-27 represented by Formula 2, can be compared and predicted. Specifically, compound H1-27 has a HOMO energy value similar to that of compound H1-1 and a LUMO energy value lower than that of compound H1-1. Therefore, it is expected that electron carriers will be sufficiently confined when compound H1-27 is used. Furthermore, when host compounds H1-1 and H1-27 are combined with a host having strong electron current characteristics, the energy values ​​confirm that there will be no problem with exciplex formation. Furthermore, the triplet energy values ​​of compounds H1-1 and H1-27 are 2.4 eV and 2.5 eV, respectively, which are sufficient to block the triplet energy of the dopant. That is, when compound H1-1 or H1-27 is used as the first host compound according to one embodiment, it can be expected that a device containing one of them will exhibit similar device characteristics to a device containing the other.

[0065] Therefore, in the following device examples, organic electroluminescent devices are fabricated by using only compounds H1-1 and H1-42 represented by Formula 1 as representative first host compounds, and the properties of the devices are described.

[0066] Comparative Example 1: Preparation of a red-emitting organic electroluminescent device not according to the present disclosure An OLED device not according to the present disclosure was fabricated. First, a transparent electrode indium tin oxide (ITO) thin film (10 Ω / sq) on an OLED glass substrate (Geomatec Co., Ltd., Japan) was ultrasonically cleaned in acetone and isopropyl alcohol, and then stored in isopropanol. Next, the ITO substrate was attached to a substrate holder in a vacuum deposition apparatus. Compound HI-1 was introduced into the cell of the vacuum deposition apparatus, and the pressure in the chamber of the apparatus was then increased to 10 -7The pressure was controlled at 500 kJ / cm². A current was then applied to the cell to evaporate the introduced material, thereby forming an 80-nm-thick first hole injection layer on the ITO substrate. Next, compound HI-2 was introduced into another cell of the vacuum evaporation system, and a current was applied to the cell to evaporate the introduced material, thereby forming a 5-nm-thick second hole injection layer on the first hole injection layer. Next, compound HT-1 was introduced into another cell of the vacuum evaporation system. A current was then applied to the cell to evaporate the introduced material, thereby forming a 10-nm-thick first hole transport layer on the second hole injection layer. Next, compound HT-2 was introduced into another cell of the vacuum evaporation system, and a current was applied to the cell to evaporate the introduced material, thereby forming a 60-nm-thick second hole transport layer on the first hole transport layer. After the hole injection layer and hole transport layer were formed, the light-emitting layer was evaporated as follows. Compound H1-1 was introduced as a host into one cell of a vacuum evaporation system, and compound D-39 was introduced as a dopant into another cell of the system. The two materials were evaporated at different rates, and the dopant was deposited at a doping amount of 3 wt % based on the total amount of host and dopant to form a 40 nm-thick emissive layer on the second hole-transporting layer. Next, compounds ETL-1 and EIL-1 were deposited as electron-transporting materials in a 50:50 weight ratio on the emissive layer to form a 35 nm-thick electron-transporting layer. Next, compound EIL-1 was deposited as an electron-injecting layer on the electron-transporting layer to a thickness of 2 nm, and then an 80 nm-thick Al cathode was deposited on the electron-injecting layer in a separate vacuum evaporation system. In this way, an OLED device was fabricated. All materials used to fabricate the OLED device were used in a 10 -6 It was purified by vacuum sublimation at torr.

[0067] Comparative Example 2: Preparation of a red-emitting organic electroluminescent device not according to the present disclosure An OLED device was fabricated in the same manner as in Comparative Example 1, except that compound H2-2 was used instead of H1-1 as the light-emitting material.

[0068] Comparative Example 3: Preparation of a red-emitting organic electroluminescent device not according to the present disclosure An OLED device was fabricated in the same manner as in Comparative Example 1, except that compound H2-1 was used instead of H1-1 as the light-emitting material.

[0069] Device Examples 1-3: Fabrication of Red-Emitting Organic Electroluminescent Devices According to the Present Disclosure In Device Examples 1 to 3, OLED devices were fabricated in the same manner as in Comparative Example 1, except that the first host compound and the second host compound listed in Table 2 below were introduced as hosts into one cell of a vacuum evaporation system, and Compound D-39 was introduced as a dopant into another cell of the system. The two host materials were evaporated simultaneously in the same ratio of 1:1, and the dopant was evaporated at different rates in a doping amount of 3 wt % based on the total weight of the host and dopant to form an emitting layer with a thickness of 40 nm.

[0070] The driving voltage, luminous efficiency, and CIE color coordinates at a luminance of 1,000 nits and the time required for the luminance to decrease from 100% to 90% (lifetime; T90) at a luminance of 5,000 nits of the organic electroluminescent devices of Comparative Examples 1 to 3 and Device Examples 1 to 3 prepared as described above are shown in Table 2. Furthermore, the current efficiency as a function of luminance of the organic electroluminescent devices prepared in Comparative Example 2 and Device Example 1 is shown in Figure 1.

[0071] [Table 7]

[0072] From the above device examples 1 to 3, it was confirmed that the combination of compounds of the present disclosure can significantly improve the efficiency and lifetime characteristics while maintaining the driving voltage similar to that of the comparative example. Specifically, referring to Figure 1, the combination of emitting layers as an organic electroluminescent device according to one embodiment shows a significant effect of improving roll-off compared to the comparative example, which is a combination of a single emitting layer.

[0073] The compounds used in the comparative examples and device examples are shown in Table 3 below.

[0074]

Table 8

Claims

1. a plurality of host materials comprising at least one first host compound and at least one second host compound, The first host compound has the following formula 2: 【Chemistry 1】 (In the formula, X １ is -N=, -NR ７ represents -, -O- or -S-; Y １ is -N=, -NR ８ represents -, -O- or -S-, but X １ When represents -N=, Y １ is -NR ８ represents -, -O- or -S-; X １ -NR ７ When - is represented, Y １ represents -N=, -O- or -S-; R １ represents a substituted or unsubstituted (C6-C30) aryl or a substituted or unsubstituted (3-30 membered) heteroaryl; R ２ , R ３ , R ５ ~R ８ each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-30 membered) heteroaryl, substituted or unsubstituted mono- or di-(C6-C30) alkylamino, substituted or unsubstituted mono- or di-(C6-C30) arylamino, or substituted or unsubstituted (C1-C30) alkyl(C6-C30) arylamino, or may combine with adjacent substituents to form a substituted or unsubstituted (C3-C30) monocyclic or polycyclic, alicyclic, or aromatic ring, whose carbon atoms may be substituted with at least one heteroatom selected from nitrogen, oxygen, and sulfur; L １ represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted (3-30 membered) heteroarylene; a represents 1; b represents 1 or 2; e represents an integer of 1 to 4; The heteroaryl(ene) contains at least one heteroatom selected from B, N, O, S, Si, and P. is represented by The second host compound has the following formula 3: 【Chemistry 2】 (In the formula, X １１ is -N=, -NR １７ represents -, -O- or -S-; Y １１ is -N=, -NR １８ represents -, -O- or -S-, but X １１ When represents -N=, Y １１ is -NR １８ represents -, -O- or -S-; X １１ -NR １７ When - is represented, Y １１ represents -N=, -O- or -S-; X represents N or CH; R １１ represents a substituted or unsubstituted (C6-C30) aryl or a substituted or unsubstituted (3-30 membered) heteroaryl; R １２ ~R １８ each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-30 membered) heteroaryl, or can combine with adjacent substituents to form a substituted or unsubstituted (C3-C30) monocyclic or polycyclic, alicyclic, or aromatic ring, the carbon atoms of which may be substituted with at least one heteroatom selected from nitrogen, oxygen, and sulfur; L ２ represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted (3-30 membered) heteroarylene; a′ represents 1; b' and c' each independently represent 1 or 2; d' represents an integer of 1 to 4; The heteroaryl(ene) contains at least one heteroatom selected from B, N, O, S, Si, and P. A plurality of host materials, represented by:

2. The formula 2 is represented by the following formulas 1-4 and 1-5: 【Chemistry 3】 (In the formula, R １ ~R ３ , R ５ , R ６ , L １ , a, b and e are as defined in claim 1.

2. The host material of claim 1, wherein the host material is represented by any one of:

3. The formula 3 is represented by the following formulas 3-1 to 3-6: 【Chemistry 4】 (In the formula, R １１ ~R １８ , L ２ , X and a' to d' are as defined in claim 1.

2. The host material of claim 1, wherein the host material is represented by any one of:

4. R １ ~R ３ , R ５ ~R ８ , R １１ ~R １８ , L １ and L ２ wherein the substituted alkyl, substituted aryl(ene), substituted heteroaryl(ene), substituted mono- or di-alkylamino, substituted mono- or di-arylamino, substituted alkylarylamino, and substituted monocyclic or polycyclic, alicyclic, or aromatic ring substituents are each independently selected from the group consisting of deuterium; halogen; cyano; carboxyl; nitro; hydroxyl; (C1-C30)alkyl; halo(C1-C30)alkyl; (C2- (C30)alkenyl; (C2-C30)alkynyl; (C1-C30)alkoxy; (C1-C30)alkylthio; (C3-C30)cycloalkyl; (3-7 membered)heterocycloalkyl; (C6-C30)aryloxy; (C6-C30)arylthio; (C6-C30)aryl- or di(C6-C30)arylamino-substituted or unsubstituted (3-30 membered)heteroaryl; cyano-, (3-30 membered)heteroaryl- or tri(C6-C 30) Arylsilyl-substituted or unsubstituted (C6-C30)aryl; tri(C1-C30)alkylsilyl; tri(C6-C30)arylsilyl; di(C1-C30)alkyl(C6-C30)arylsilyl; (C1-C30)alkyldi(C6-C30)arylsilyl; amino; mono- or di-(C1-C30)alkylamino; mono- or di-(C6-C30)arylamino; (C1-C30)alkyl(C6-C30)arylamino; ( 2. The host material of claim 1, which is at least one selected from the group consisting of: C1-C30) alkylcarbonyl; (C1-C30) alkoxycarbonyl; (C6-C30) arylcarbonyl; di(C6-C30) arylboronyl; di(C1-C30) alkylboronyl; (C1-C30) alkyl(C6-C30) arylboronyl; (C6-C30) ar(C1-C30) alkyl; and (C1-C30) alkyl(C6-C30) aryl.

5. The compound represented by formula 2 is 【Chemistry 5】 The host material of claim 1 selected from the group consisting of:

6. The compound represented by formula 3 is 【Chemistry 6】 【Chemistry 7】 【Chemistry 8】 【Chemistry 9】 The host material of claim 1 selected from the group consisting of:

7. 13. An organic electroluminescent device comprising an anode, a cathode, and at least one light-emitting layer between the anode and the cathode, the light-emitting layer comprising a host and a phosphorescent dopant, the host comprising the host material of claim 1.

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