KR101396171B1 - Novel organic electroluminescent compounds and an organic electroluminescent device using the same - Google Patents

Abstract

The present invention relates to a novel organic light emitting compound and an organic electroluminescent device including the same. The organic electroluminescent device according to the present invention has an advantage of being able to manufacture an organic electroluminescent device having a high luminous efficiency, a long driving life and an improved power efficiency by lowering a driving voltage, thereby improving power consumption .

Description

TECHNICAL FIELD The present invention relates to a novel organic electroluminescent compound and an organic electroluminescent device using the same,

The present invention relates to a novel organic light emitting compound and an organic electroluminescent device employing the same.

Among display devices, an electroluminescence device (EL device) is a self-luminous display device having a wide viewing angle, excellent contrast, and fast response speed. In 1987, Eastman Kodak Company developed an organic EL device using an aromatic diamine and an aluminum complex having low molecular weight as a light emitting layer forming material [Appl. Phys. Lett. 51, 913, 1987].

The most important factor for determining the luminous efficiency in the organic EL device is the luminescent material. As a luminescent material, a fluorescent luminescent material has been widely used, but the development of a phosphorescent luminescent material has been widely carried out in view of the fact that the phosphorescent luminescent material on the mechanism of electroluminescence can improve the luminescent efficiency by the theoretical four times as compared with the fluorescent luminescent material . Until now, the iridium (III) complex series has been widely known as a phosphorescent light emitting material, and each of R, G and B has (acac) Ir (btp) ₂ (bis (2- (2'-benzothienyl) -pyridinate- 3 ') iridium (acetylacetonate)), Ir (ppy) ₃ (tris (2-phenylpyridine) iridium) and Firpic (bis (4,6-difluorophenylpyridinate- Collisional iridium) and the like are known.

The light emitting material may also be used as a dopant / host material system in which a host material and a dopant are mixed to improve color purity, luminous efficiency and stability. When using such a system, the selection is important because the host material greatly affects the efficiency and performance of the light emitting device. In the prior art, 4,4'-bis (carbazol-9-yl) biphenyl (CBP) is the most widely known phosphorescent host material. In recent years, Pioneer, etc., of Japan, have been using bathocuproine (BCP) and aluminum (III) bis (2-methyl-8-quinolinate) (4-phenyl phenolate) Balq) as a host material to develop a high-performance organic EL device.

However, the conventional phosphorescent host materials are advantageous from the viewpoint of luminescence characteristics, but they have the following disadvantages: (1) the material is changed when the glass transition temperature is low and the thermal stability is low and the high temperature deposition process is performed under vacuum . (2) In the organic EL device, the power efficiency is inversely proportional to the voltage since it is in the relationship of power efficiency = [(pi / voltage) x current efficiency]. However, the organic EL device using the phosphorescent host material has a higher current efficiency (cd / A) than the organic EL device using the fluorescent material, but the driving voltage is also very high, so there is no great advantage in terms of power efficiency (lm / w) . (3) In addition, when used in an organic EL device, it is unsatisfactory in terms of operating life, and luminous efficiency is still required to be improved.

Korean Patent Publication No. 948700 discloses a compound for an organic electroluminescent material in which an aryl group containing an nitrogen is substituted with an arylcarbazole skeleton. However, this document does not disclose a compound having both a carbazole skeleton substituted with dibenzothiophene and an aryl compound containing nitrogen. In addition, organic EL devices including the compounds disclosed in the above documents are still unsatisfactory in terms of luminous efficiency, driving voltage and lifetime characteristics.

Accordingly, an object of the present invention is to provide an organic electroluminescent compound having excellent luminous efficiency and device lifetime and a low driving voltage, and secondly, to provide a highly efficient and long-lasting organic electroluminescent device employing the organic electroluminescent compound will be.

As a result of intensive studies to solve the above technical problems, the present inventors have found that an organic luminescent compound represented by the following general formula (1) achieves the above-mentioned object and completed the present invention.

 [Chemical Formula 1]

In Formula 1,

L ₁ and L ₂ are each independently a single bond, substituted or unsubstituted (3-30 membered heteroarylene, or substituted or unsubstituted (C6-C30) arylene;

X ₁ and X ₂ are each independently CR 'or N;

Y is S, O or -CR < ₂₁ > R < _{22 &} gt ;;

_{Ar 1, Ar 2, R '} , R 21 and R ₂₂ are each independently hydrogen, deuterium, halogen, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, or substituted Or unsubstituted (3-30 membered) heteroaryl;

R ₁ to R ₄ are each independently hydrogen, deuterium, halogen, substituted or unsubstituted (C 1 -C 30) alkyl, substituted or unsubstituted (C 6 -C 30) aryl, Heteroaryl, -NR ₁₁ R ₁₂ , -SiR ₁₃ R ₁₄ R ₁₅ , -SR ₁₆ , -OR _17, cyano, nitro or hydroxy;

R ₁₁ to R ₁₇ are each independently hydrogen, deuterium, halogen, substituted or unsubstituted (C 1 -C 30) alkyl, substituted or unsubstituted (C 6 -C 30) aryl, Heteroaryl or may form a monocyclic or polycyclic alicyclic ring or aromatic ring with an adjacent substituent and the carbon atom of the formed monocyclic or polycyclic alicyclic ring or aromatic ring is selected from nitrogen, One or more atoms may be replaced;

a and d are each independently an integer of 1 to 4, and when a or d is an integer of 2 or more, each R ₁ or each R ₄ may be the same or different from each other;

b and c are each independently an integer of 1 to 3, and when b or c is an integer of 2 or more, each R ₂ or each R ₃ may be the same or different from each other;

The heteroaryl and heteroarylene comprise at least one atom selected from B, N, O, S, P (= O), Si and P.

Wherein L ₁ , L ₂ , Ar ₁ , Ar ₂ , R ' Substituents further substituted on R ₁ to R ₄ , R ₁₁ to R ₁₇ , R ₂₁ and R ₂₂ independently of one another are selected from the group consisting of deuterium, halogen, (C 1 -C 30) alkyl, (C 1 -C 30) (C6-30 aryl), (3-30 membered heteroaryl, (3-30 membered) heteroaryl substituted by (C6-30 aryl), (3-30 membered) heteroaryl, (C6-C30) arylsilyl, di (C1-C30) alkyl (C6-C30) arylsilyl, (C6-C30) alkylsilyl, (C2-C30) alkenyl, (C2-C30) alkynyl, cyano, di (C1- (C1-C30) alkyl (C6-C30) arylamino, di (C6-C30) arylcarbonyl, di (C1-C30) alkyl, (C1-C30) alkyl (C6-C30) aryl, carboxyl, nitro and hydroxy .

The substituents comprising the "alkyl", "alkoxy" and other "alkyl" moieties described in the present invention include both linear and branched forms, and "cycloalkyl" includes both single rings as well as substituted or unsubstituted adamantyl or And polycyclic hydrocarbons such as substituted or unsubstituted (C7-C30) bicycloalkyl. "Aryl" as used herein refers to an organic radical derived from an aromatic hydrocarbon by the removal of one hydrogen, a single or fused ring system containing, suitably, from 4 to 7, preferably 5 or 6 ring atoms in each ring And includes a plurality of aryls connected by a single bond. Specific examples thereof include phenyl, naphthyl, biphenyl, terphenyl, anthryl, indenyl, fluorenyl, phenanthryl, triphenylenyl, pyreneyl, perylenyle, crycenyl, naphthacenyl and fluoranthenyl. The naphthyl includes 1-naphthyl and 2-naphthyl, anthryl includes 1-anthryl, 2-anthryl and 9-anthryl, and fluorenyl includes 1-fluorenyl, 2- Fluorenyl, 3-fluorenyl, 4-fluorenyl, and 9-fluorenyl. "Heteroaryl" as used herein refers to an aromatic ring skeleton containing 1 to 4 heteroatoms selected from B, N, O, S, P (= O), Si and P as the aromatic ring skeletal atoms, Means an aryl group, monocyclic heteroaryl, and polycyclic heteroaryl that is condensed with one or more benzene rings, and may be partially saturated. The heteroaryl in the present invention also includes a form in which at least one heteroaryl is linked to another heteroaryl or aryl group by a single bond. The heteroaryl groups include divalent aryl groups in which the heteroatoms in the ring are oxidized or trisubstituted to form, for example, an N-oxide or a quaternary salt. Specific examples include furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, Monocyclic heteroaryl such as tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl and pyridazinyl, benzofuranyl, benzothiophenyl, isobenzofuranyl, benzoimidazolyl, benzothiazolyl, benzoiso Benzothiazolyl, benzothiazolyl, benzooxazolyl, isoindolyl, indolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, quinazolinyl, quinoxalinyl, (Such as pyridyl N-oxide, quinolyl N-oxide), polycyclic heteroaryls such as benzyloxycarbonyl, benzyloxycarbonyl, benzyloxycarbonyl, benzyloxycarbonyl, And the like.

The (C1-C30) alkyl (phenylene) group described in the present invention is preferably a (C1-C20) alkyl (phenylene), more preferably a (C6-C30) aryl (Rhen) "group is preferably (C6-C20) aryl (Rhen), more preferably (C6-C12) aryl The "(3-30 membered) heteroaryl (phenylene)" group is preferably (3-20 member) heteroaryl (phenylene), more preferably (5- 13 member) heteroaryl (phenylene). The "(C3-C30) cycloalkyl" group is preferably (C3-C20) cycloalkyl, more preferably (C3-C7) cycloalkyl. The "(C2-C30) alkenyl (R) or alkynyl (Rhen)" group is preferably a (C2-C20) alkenyl (Rhen) or alkynyl (Rhen), more preferably a (R) or alkynyl (R).

Preferably, L < ₁ > and L < ₂ > are each independently a single bond; Or substituted or unsubstituted aliphatic dicarboxylic acids such as phenylene, biphenylene, terphenylene, indenylene, fluorenylene, triphenylrenylene, pyreneylene, peryleneylene, chryshenylene, naphthaceneylene, fluoranthenylene, thio Examples of the substituent include phenylene, pyrrolylene, pyrazolylene, thiazolylene, oxazolylene, oxadiazolylene, triazinylene, tetrazinylene, triazolylene, tetrazolylene, puracilane, pyridylene, benzofuranylene, Benzothiophenylene, benzothiophenylene, indolene, benzimidazolylene, benzothiazolylene, benzoisothiazolylene, benzoisoxazolylene, benzoxazolylene, benzothiadiazolylene, dibenzofurananylene or dibenzothiophenyl ;

Ar ₁ , Ar _2, R ', R ₂₁ and R ₂₂ are each independently hydrogen; N-butyl, n-pentyl, i-pentyl, n-hexyl, n-heptyl, n-octyl, Perfluoroethyl, perfluoropropyl, perfluorobutyl, phenyl, biphenyl, fluorenyl, perfluoroethyl, perfluoroethyl, perfluorohexyl , Fluoranthene, terphenyl, pyrenyl, klycenyl, naphthacenyl, perylene, pyridyl, pyrrolyl, furanyl, thiophenyl, imidazolyl, benzoimidazolyl, quinolyl, triazinyl, Thiazolyl, oxazolyl, benzothiazolyl, benzoxazolyl, phenanthrolinyl, quinoxalinyl or N, N-diethoxycarbonyl, benzothiophenyl, dibenzothiophenyl, pyrazolyl, indolyl, -Carbazolyl, more preferably R ₂₁ and R ₂₂ are each independently hydrogen, methyl, ethyl, n-propyl or i-propyl;

R ₁ To R ₄ are each independently selected from the group consisting of hydrogen, deuterium, chloro, fluoro, methyl, ethyl, n-propyl, i- N-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, n-nonyl, decyl, dodecyl, hexadecyl, trifluoromethyl, perfluoroethyl, trifluoroethyl, perfluoropropyl, perfluoro Examples of the substituents include alkyl groups such as methyl, ethyl, propyl, isopropyl, butyl, phenyl, biphenyl, fluorenyl, fluoranthenyl, triphenyleney, pyrenyl, And examples thereof include a benzyl group, a benzyl group, a benzyl group, a benzyl group, a benzyl group, a benzyl group, a benzyl group, a benzyl group, a benzyl group, a pyrrolyl group, Benzothiazolyl, benzoxazolyl, phenanthrolinyl or N-carbazolyl; < RTI ID = 0.0 >

a to d are each independently an integer of 1 to 2, more preferably 1;

Wherein each of L ₁ , L ₂ , Ar ₁ , Ar ₂ , R ', R ₁ to R ₄ , R ₂₁ and R ₂₂ are each independently selected from the group consisting of deuterium, chloro, fluoro, methyl, ethyl, n-propyl, i- N-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, n-nonyl, decyl, dodecyl, hexadecyl, trifluoromethyl, perfluoroethyl, trifluoroethyl, perfluoropropyl, perfluoro Butyl, phenyl, biphenyl, fluorenyl, fluoranthenyl, triphenyleney, pyrenyl, klycenyl, naphthacenyl, perilylene, fluorotrimethylsilyl, triethylsilyl, tripropylsilyl, tri (t- More preferably at least one member selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, sec-butyldimethylsilyl, N-propyl, n-butyl, i-butyl, t-butyl, With at least one member selected from the group consisting of thread may be further substituted.

The organic luminescent compound according to the present invention can be more specifically exemplified as the following compounds.

The organic luminescent compound according to the present invention can be prepared as shown in the following reaction formula.

[Reaction Scheme 1]

Wherein Ar ₁ , Ar ₂ , L ₁ , L ₂ , Y, X ₁ , X ₂ , R ₁ to R ₄ , a, b, c and d are as defined in the formula Is a halogen.]

The present invention provides, in a further aspect, an organic electroluminescent device comprising the compound of formula (1). An organic electroluminescent device according to the present invention includes a first electrode; A second electrode; And at least one organic material layer interposed between the first electrode and the second electrode, wherein the organic material layer contains at least one compound of the formula (1).

One of the first electrode and the second electrode may be an anode and the other may be a cathode. The organic material layer may further include one or more layers selected from the group consisting of a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, an interlayer and a hole blocking layer.

The compound of Formula 1 of the present invention may be included in at least one of the light emitting layer and the hole transporting layer. When used in a hole transporting layer, the compound of Formula 1 of the present invention can be included as a hole transporting material. When used in the light emitting layer, the compound of Formula 1 of the present invention can be included as a host material; Preferably further comprising one or more dopants; If desired, a compound other than the compound of formula (1) of the present invention may be further included as a second host material.

As the dopant, at least one phosphorescent dopant is preferable. The phosphorescent dopant material to be applied to the organic electroluminescent device of the present invention is not particularly limited, but is preferably a complex compound of a metal atom selected from iridium (Ir), osmium (Os), copper (Cu) and platinum (Pt) , An iridium (Ir), an osmium (Os), a copper (Cu) and a platinum (Pt) are more preferable, and an orthometallated iridium complex compound is even more preferable.

The phosphorescent dopant is preferably selected from the group consisting of the compounds represented by the following Chemical Formulas 2 to 4.

(2)

(3)

[Chemical Formula 4]

In the above formulas 2 to 4, L is selected from the following structures;

R ₁₀₀ is hydrogen or substituted or unsubstituted (C 1 -C 30) alkyl; R ₁₀₁ to R ₁₀₉ And R ₁₁₁ to R ₁₂₇ are each independently hydrogen, deuterium, halogen, (C 1 -C 30) alkyl, cyano, or substituted or unsubstituted (C 1 -C 30) alkoxy, substituted or unsubstituted with halogen; R ₂₀₁ To R < ₂₁₁ > are each independently hydrogen, deuterium, halogen, or (C1-C30) alkyl unsubstituted or substituted with halogen; f and g are each independently an integer of 1 to 3, h is an integer of 1 to 2, and when f to h are each an integer of 2 or more, each R ₁₀₀ may be the same or different from each other; n is an integer of 1 to 3;

Specific examples of the phosphorescent dopant material are as follows.

Further, the organic electroluminescent device of the present invention includes a first electrode; A second electrode; And at least one organic material layer interposed between the first electrode and the second electrode, wherein the organic material layer includes a light emitting layer, and the light emitting layer comprises the composition for an organic electroluminescence device of the present invention and a phosphorescent dopant material, A composition for an electroluminescent device is used as a host material.

The organic electroluminescent device of the present invention may include one or more compounds selected from the group consisting of an arylamine-based compound and a styrylarylamine-based compound in addition to the compound of Formula 1 in the organic material layer.

In addition, in the organic electroluminescent device of the present invention, in addition to the compound of Formula 1, an organic compound selected from the group consisting of Group 1, Group 2, Group 4, Group 5 transition metal, Lanthanide series metal and d- And the organic layer may further include a light emitting layer and a charge generating layer.

In addition, the organic electroluminescent device of the present invention may emit white light by further including at least one light emitting layer containing a blue, red or green light emitting compound known in the art, in addition to the compound of the present invention. Further, if necessary, it may further include a yellow or orange light emitting layer.

In the organic electroluminescent device of the present invention, one layer selected from a chalcogenide layer, a metal halide layer and a metal oxide layer (hereinafter referred to as "surface layer ") is formed on the inner surface of at least one of the pair of electrodes, Or more. Concretely, it is preferable to dispose a halogenated metal layer or a metal oxide layer on the surface of the anode on the side of the light emitting medium layer and on the surface of the cathode on the side of the light emitting medium layer, with a chalcogenide (including oxide) layer of a metal of silicon and aluminum Do. Thus, stabilization of the drive can be obtained. Preferable examples of the chalcogenide include SiO _X (1? _X ? 2), AlO _x (1? _X ? 1.5), SiON or SiAlON. Preferred examples of the halogenated metal include LiF, MgF ₂ , CaF ₂ , Rare-earth metals, etc. Preferred examples of the metal oxides include Cs ₂ O, Li ₂ O, MgO, SrO, BaO, CaO and the like.

In the organic electroluminescent device of the present invention, it is also preferable to arrange a mixed region of the electron transport compound and the reducing dopant or a mixed region of the hole transport compound and the oxidative dopant on at least one surface of the pair of electrodes thus fabricated . In this way, since the electron transport compound is reduced to an anion, it becomes easy to inject and transport electrons from the mixed region into the light emitting medium. Further, since the hole transporting compound is oxidized and becomes a cation, it becomes easy to inject and transport holes from the mixed region into the light emitting medium. Preferred oxidizing dopants include various Lewis acids and acceptor compounds, and preferred reducing dopants include alkali metals, alkali metal compounds, alkaline earth metals, rare earth metals, and mixtures thereof. Further, a white organic electroluminescent device having two or more light emitting layers can be manufactured using a reductive dopant layer as a charge generation layer.

The organic electroluminescent device according to the present invention can produce an organic electroluminescent device having improved luminous efficiency and driving lifetime as well as an improved power efficiency by lowering the driving voltage.

Hereinafter, the method for producing an organic luminescent compound according to the present invention and the luminescent characteristics of the device will be illustrated.

The meanings of the abbreviations used in the following examples are as follows.

EA: ethyl acetate, THF: tetrahydrofuran, MC: methylene chloride, n-bu: n-butyl, DMF: dimethylformamide, DME: dimethyl ether. i-Pr: isopropyl, EtOH: ethanol

[ Manufacturing example  1] Preparation of compound C-31

compound A-2 Manufacturing

Mixing the compound A-1 20g (0.087mol), 4- bromo benzene Moai Goto 49.6g (0.175mol), Pd (PPh 3) 4 3.039g (0.0026mol), 1M Na 2 CO 3 and toluene 400ml was stirred under reflux. After 3 hours, it was cooled to room temperature and distilled water was added. Extracted with EA and dried over MgSO _4. Distilled under reduced pressure and subjected to column separation to obtain 23 g (0.065 mol, 75.6%) of Compound A-2 .

compound A-3 Manufacturing

23 g (0.065 mol) of the compound A-2 was dissolved in 700 ml of THF, and 39 ml (0.098 mol, 2.5 M in hexane) of n-buLi was slowly added at -78 캜. After one hour, 30.2 ml (0.131 mol) of triisopropylborate was added. The mixture was stirred at room temperature for 12 hours, and distilled water was added thereto. EA was added and the mixture was extracted, dried over MgSO ₄ , and distilled under reduced pressure. The residue was recrystallized from MC and hexane to obtain 15 g (0.049 mol, 75.38%) of Compound A-3 .

compound A-4 Manufacturing

Compound A-3 15g (49.31mmol), 2- bromo-nitrobenzene, 12.9g (64.10mmol), Pd (PPh 3) 4 1.13g (0.98mmol), 2M Na 2 CO 3 60ml, 150ml of toluene and 50ml of ethanol were put into And the mixture was refluxed and stirred. After 4 hours, it was cooled to room temperature and distilled water was added. Extracted with EA and dried over MgSO _4. Distilled under reduced pressure, and recrystallized from MC and hexane to obtain 13.5 g (35.39 mmol, 71.77%) of Compound A-4 .

compound A-5 Manufacturing

13.5 g of Compound A-4, 150 ml of triethylphosphite and 150 ml of 1,2-dichlorobenzene were placed, and the mixture was stirred at 150 占 폚 for 10 hours. The mixture was cooled to room temperature and distilled under reduced pressure. The column was separated to obtain 8 g (22.89 mmol, 65.4%) of Compound A-5 .

compound A-7 Manufacturing

Compound A-6 20g (72.96mmol), 2,4- dichloropyrimidine 9.8g (66.32mmol), Pd (PPh 3) 4 2.28g (1.97mmol), 2M Na 2 CO 3 was stirred and mixed to 80ml DME reflux 200ml Respectively. After stirring for 12 hours, the mixture was cooled to room temperature and distilled water was added thereto. Extracted with EA and dried over MgSO _4. The mixture was distilled under reduced pressure and subjected to column separation to obtain 9 g (26.25 mmol, 39.77%) of Compound A-7 .

compound C-31 Manufacturing

5 g (14.58 mmol) of Compound A-7 and 6.11 g (17.50 mmol) of Compound A-5 were dissolved in 120 ml of DMF, and 0.52 g (21.87 mmol) of NaH was added thereto. The mixture was stirred at room temperature for 12 hours and methanol was added thereto. The resulting solid was filtered under reduced pressure and recrystallized from EA and CHCl ₃ to obtain 6.5 g (9.91 mmol, 67.97%) of the compound C-31 .

MS / FAB measurement 656 , calculated 655.21

[ Manufacturing example  2] Preparation of Compound C-41

compound 2-2 Manufacturing

(0.0038 mol) of PdCl ₂ (PPh ₃ ) ₂ , 150 ml of 2M Na ₂ CO _3, 150 ml of toluene and 30 ml of ethanol were added to a solution of the compound 2-1 (25 g, 0.126 mol), 4-bromoiodobenzene 89.3 g And the mixture was stirred at 110 ° C for 3 hours. And then extracted with EA. ≪ / _RTI > and dried over MgSO4. The mixture was distilled under reduced pressure and then subjected to column separation to obtain 31 g (0.100 mol, 80%) of Compound 2-2 .

compound 2-3 Manufacturing

31 g (0.100 mol) of the compound 2-2 was dissolved in 750 ml of THF, and 60 ml (0.150 mol, 2.5 M in hexane) of n-buLi was slowly added at -78 캜. After one hour, 46 ml (0.200 mol) of triisopropylborate was added. The mixture was stirred at room temperature for 12 hours, and distilled water was added thereto. Extracted with EA and dried over MgSO _4. The residue was distilled under reduced pressure and recrystallized from MC and hexane. 21 g (0.076 mol, 76.6%) of Compound 2-3 was obtained.

compound 2-4 Manufacturing

7 g (0.047 mol) of 2,4-dichloropyrimidine, 10 g (0.036 mol) of Compound 2-3 , 45 ml of 2M Na ₂ CO ₃ , 182 ml of toluene and 45 ml of ethanol were placed and stirred under reflux. The mixture was stirred for 12 hours and cooled to room temperature. Distilled water was added and extracted with EA. Dried over MgSO ₄ and evaporated under reduced pressure. The mixture was subjected to column separation to obtain 9 g (0.026 mol, 72.9%) of the compound 2-4 .

compound C-41 Manufacturing

5 g (14.58 mmol) of the compound 2-4 and 6.11 g (17.50 mmol) of the compound A-5 were dissolved in 120 ml of DMF, and 0.52 g (21.87 mmol) of NaH was added thereto. The mixture was stirred at room temperature for 12 hours and methanol was added thereto. The resulting solid was filtered under reduced pressure and recrystallized from EA and CHCl ₃ to obtain 6.0 g (0.009 mol, 62.75%) of the compound C-41 .

MS / FAB measurement 658 , calculated 657.22

[ Manufacturing example  3] Preparation of Compound C-53

compound C-53 Manufacturing

Compounds 3-1, 4 - ([1,1'-biphenyl] -4-yl) -2-chloro-6-phenyl-pyrimidine (5g, 14.58mmol), compound A-5 (5.6g, 16.04mmol) Was dissolved in 100 ml of DMF, and NaH (0.87 g, 60% in mineral oil, 21.87 mmol) was added. And the mixture was stirred at room temperature for 12 hours. Methanol was added and the mixture was filtered under reduced pressure. The obtained solid was subjected to column separation to obtain Compound C-53 (7 g, 10.67 mmol, 73.2%).

MS / FAB Measured 655.8 Calculated 655.21

[ Manufacturing example  4] Preparation of Compound C-64

compound C-64 of Produce

Compound A-5 (4 g, 11.4 mmol) was suspended in 57 ml of DMF, followed by the addition of 60% NaH (684 mg, , 17.1 mmol) was added at room temperature. Stir for 12 hours. Purified water (1 L) was added thereto and then filtered under reduced pressure. The obtained solid was subjected to column separation to obtain a compound C-64 (2.4 g, 36.4%)

MS / FAB Measured 580.7 Calculated 580.17

[ Manufacturing example  5] Preparation of Compound C-66

compound 5-1 Manufacturing

Compound A-5 (10g, 0.03mol) , 1- bromo-4-iodo-benzene (16g, 0.06mol), CuI ( 2.7g, 0.01mol), ethylenediamine _{(1.9ml, 0.03mol), K 3} PO ₄ (15 g, 0.07 mol) and toluene (150 ml) were added thereto, followed by stirring at 120 ° C for 12 hours. After completion of the reaction, the reaction mixture was extracted with EA. The organic layer was dried over MgSO ₄ and filtered. The solvent was removed under reduced pressure and then the column was separated to obtain Compound 5-1 (13 g, 91%).

compound 5-2 Manufacturing

Anhydrous THF (200 ml) and Compound 5-1 (13 g, 0.03 mol) were added, and n-BuLi (16 ml, 2.25 M solution in hexane) was slowly added at -78 deg. The mixture was stirred at -78 ° C for 1 hour, and B (O-iPr) ₃ (12ml, 0.05mol) was slowly added thereto at -78 ° C. After completion of the reaction, the reaction mixture was extracted with EA. The organic layer was dried over MgSO ₄ and filtered. The solvent was removed under reduced pressure, and the product was recrystallized to obtain Compound 5-2 (11 g, 90%

compound C-66 Manufacturing

Compound 5-2 (11g, 0.02mol), 2- chloro-4,6-diphenyl-1,3,5-triazine (8.2g, 0.03mol), Pd ( PPh 3) 4 (1.35g, 0.001mol ), K ₂ CO ₃ (9.7 g, 0.07 mol), toluene (120 ml), EtOH (30 ml) and H ₂ O (35 ml) were added thereto and stirred at 120 ° C. for 12 hours. After completion of the reaction, the reaction mixture was extracted with EA, and the organic layer was dried with MgSO ₄ , filtered, and the solvent was removed under reduced pressure, followed by recrystallization to obtain Compound C-66 (8.3 g, 54%

MS / FAB Measured 656.8 Calculated 656.2

[ Example  1] Using the organic luminescent compound according to the present invention OLED  Device fabrication

First, a transparent electrode ITO thin film (15 Ω / □) obtained from a glass for OLED (manufactured by Samsung Corning) was subjected to ultrasonic cleaning using trichlorethylene, acetone, ethanol and distilled water sequentially and then stored in isopropanol Respectively. Next, an ITO substrate was mounted on a substrate holder of a vacuum deposition apparatus, and 2-TNATA (4,4 ', 4 "-tris (N, N- (2-naphthyl) phenylamino) Triphenylamine] was added and the chamber was evacuated until the degree of vacuum reached 10 ^-6 torr. Then, a current was applied to the cell to evaporate 2-TNATA to deposit a 60 nm thick hole injection layer on the ITO substrate. Next, NPB [ N, N ' -bis (α-naphthyl) -N, N' -diphenyl-4,4'-diamine] was added to another cell in the vacuum deposition apparatus, A hole transporting layer having a thickness of 20 nm was deposited on the hole injecting layer by evaporation to form a hole injecting layer and a hole transporting layer and then a light emitting layer was deposited on the hole injecting layer and the hole transporting layer as follows: into the compound C-31, another cell as a dopant and then into a compound D- 1, respectively, evaporation of the two materials at different rates, (1-naphthyl) -2- (4-phenyl-1-phenyl-1H-1-naphthyl) -Benzo [d] imidazol-2-yl) anthracene, lithium quinolate was added to another cell, and the two materials were evaporated at different rates and doped with 30 to 70% Then, lithium quinolate was deposited to a thickness of 1 to 2 nm as an electron injecting layer, and then an Al cathode was deposited to a thickness of 150 nm using another vacuum deposition equipment to fabricate an OLED device Each compound was purified by vacuum sublimation at 10 ^-6 torr and used as an OLED light emitting material.

As a result, a current of 2.41 mA / cm ² flowed at a voltage of 3.2 V, and green luminescence of 1000 cd / m ² was confirmed.

[ Example  2] Using the organic luminescent compound according to the present invention OLED  Device fabrication

An OLED device was fabricated in the same manner as in Example 1 except that the compound C-31 was used as a host material and the compound D-28 was used as a dopant. As a result, a current of 2.55 mA / cm ² was passed at a voltage of 3.7 V and orange light emission of 1000 cd / m ² was confirmed.

[ Example  3] Using the organic luminescent compound according to the present invention OLED  Device fabrication

An OLED device was fabricated in the same manner as in Example 1 except that the compound C-31 was used as a host material and the compound D-44 was used as a dopant. As a result, a current of 6.67 mA / cm < ² > flowed at a voltage of 4.0 V and a deep orange light emission of 1000 cd / m < ² >

[ Example  4] Using the organic luminescent compound according to the present invention OLED  Device fabrication

An OLED device was fabricated in the same manner as in Example 1 except that the compound C-41 was used as the host material and the compound D-1 was used as the dopant. As a result, a current of 2.46 mA / cm ² flowed at a voltage of 3.1 V, and green luminescence of 1000 cd / m ² was confirmed.

[ Example  5] Using the organic luminescent compound according to the present invention OLED  Device fabrication

An OLED device was fabricated in the same manner as in Example 1 except that Compound C-66 was used as a host material and Compound D-1 was used as a dopant. As a result, a current of 2.65 mA / cm ² was passed at a voltage of 3.0 V, and green luminescence of 1000 cd / m ² was confirmed.

[ Example  6] Using the organic luminescent compound according to the present invention OLED  Device fabrication

OLED devices were fabricated in the same manner as in Example 1 except that the compound C-53 was used as the host material and the compound D-1 was used as the dopant. As a result, a current of 2.56 mA / cm ² flowed at a voltage of 3.0 V and green luminescence of 1000 cd / m ² was confirmed.

[ Comparative Example  1] Using conventional light emitting materials OLED  Luminescent characteristics of device

CBP was used instead of the compound of the present invention as a host material in one of the cells in the vacuum vapor deposition apparatus and a light emitting layer of 30 nm in thickness was deposited on the hole transporting layer by using D-1 as a dopant and BAlq was deposited as a hole blocking layer to a thickness of 10 nm OLED devices were fabricated in the same manner as in Example 1 except for the following. As a result, a current of 2.86 mA / cm ² flowed at a voltage of 4.9 V, and green luminescence of 1000 cd / m ² was confirmed.

[ Comparative Example  2] Using a conventional light emitting material OLED  Device fabrication

A light emitting layer of 30 nm in thickness was deposited on the hole transport layer using CBP as a host material and a compound D-28 as a dopant, and BAlq was deposited to a thickness of 10 nm as a hole blocking layer. An OLED device was fabricated. As a result, a current of 3.05 mA / cm < ² > flows at a voltage of 4.6 V and orange light emission of 1000 cd / m < ² >

[ Comparative Example  3] Using a conventional light emitting material OLED  Device fabrication

An OLED device was fabricated in the same manner as in Comparative Example 1 except that Compound D-44 was used as a dopant. As a result, a current of 8.2 mA / cm < ² > flows at a voltage of 5.2 V and a deep orange light emission of 1000 cd / m < ² >

It was confirmed that the luminescence properties of the compounds developed in the present invention are superior to those of the conventional materials. In addition, the device using the compound according to the present invention as a host material for luminescence not only excels in luminescence characteristics but also can lower the driving voltage, thereby inducing an increase in power efficiency and improving power consumption.

Claims (5)

An organic light-emitting compound represented by the following formula (1).
[Chemical Formula 1]

In Formula 1,
L ₁ is a single bond; (5-15) heteroarylene; Or (C6-C18) arylene which is unsubstituted or substituted by halogen, (C1-C6) alkyl or (C6-C18)
L < _{2 >} is a single bond or unsubstituted (C6-C18)
X ₁ and X ₂ are each independently CR 'or N;
Y is S or O;
Ar ₁ is hydrogen; (C1-C6) alkyl; Or (C6-C18) aryl which is unsubstituted or substituted by (C1-C6) alkyl or (C6-C18)
Ar ₂ is hydrogen; (C6-C18) aryl optionally substituted with (C1-C6) alkyl or (C6-C18) aryl; Or (5-15 member) heteroaryl substituted by (C6-C18) aryl,
R 'is hydrogen; Or (C6-C18) aryl which is unsubstituted or substituted by halogen, (C1-C6) alkyl, (C6-C18)
R ₁ to R ₄ are each independently hydrogen; (C1-C6) alkyl; Or (C6-C18) aryl which is unsubstituted or substituted by deuterium or (C1-C6) alkyl.
a, b, c and d are each independently an integer of 1,
Wherein said heteroarylene and said heteroaryl comprise at least one heteroatom selected from N, < RTI ID = 0.0 > O and S. < / RTI > delete The compound according to claim 1, wherein L ₁ is a single bond, phenylene, phenylene substituted with fluoro, phenylene substituted with methyl, phenylene substituted with phenyl, biphenylene, fluorenylene substituted with dimethyl, Thiophenylene, phenyl substituted thiophenylene, pyridylene or benzothiophenylene,
L < _{2 >} is a single bond or unsubstituted phenylene,
Ar ₁ is hydrogen, methyl, phenyl, phenyl substituted with methyl, biphenyl, fluorenyl, fluorenyl substituted with dimethyl, fluorenyl substituted with phenyl, or terphenyl,
Ar ₂ is hydrogen, phenyl, biphenyl, terphenyl, phenyl substituted with methyl, phenyl substituted with biphenyl, or pyridyl substituted with biphenyl,
Wherein R 'is selected from the group consisting of hydrogen, phenyl, biphenyl, terphenyl, fluorenyl, fluorenyl substituted with dimethyl, phenyl substituted with methyl, phenyl substituted with diphenyl, phenyl substituted with fluoro, Lt; / RTI >
Each of R ₁ to R ₄ is independently hydrogen, methyl, n-propyl, i-propyl, phenyl, phenyl substituted with methyl, phenyl substituted with deuterium, biphenyl, fluorenyl substituted with dimethyl, ego,
and each of a to d is independently an integer of 1. Lt; RTI ID = 0.0 > 1, < / RTI >

An organic electroluminescent device comprising the organic electroluminescent compound according to claim 1.