KR101771531B1 - Spiro compound and organic electroluminescent devices comprising the same - Google Patents

Abstract

The present invention relates to a novel spiro compound and an organic electroluminescent device including the spiro compound, and the organic electroluminescent device including the spiro compound according to the present invention has an excellent effect on luminance, color purity and lifetime characteristics.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a spiro compound and an organic electroluminescent device including the spiro compound.

TECHNICAL FIELD The present invention relates to a spiro compound and an organic electroluminescent device including the spiro compound, and more particularly, to a spiro compound and an organic electroluminescent device including the spiro compound having excellent brightness, color purity and lifetime.

In recent years, the demand for a flat display device having a small space occupation has been increasing due to the enlargement of a display device. The liquid crystal display, which is a typical flat display device, has an advantage of being lighter than a conventional CRT (cathode ray tube) angle is limited and a back light is necessarily required. On the other hand, an organic light emitting diode (OLED), which is a new flat display device, is a display using a self-luminous phenomenon, has a large viewing angle, is slimmer and smaller than a liquid crystal display, And in recent years, application to a full-color display or illumination is expected.

In general, organic light emission phenomenon refers to a phenomenon in which an organic material is used to convert electric energy into light energy.

An organic electroluminescent device using an organic light emitting phenomenon usually has a structure including an anode, an anode, and an organic material layer therebetween. Here, in order to enhance the efficiency and stability of the organic electroluminescent device, the organic material layer may have a multi-layer structure composed of different materials and may include a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer. When a voltage is applied between the two electrodes in the structure of the organic electroluminescent device, holes are injected into the anode, electrons are injected into the organic layer, and excitons are formed when injected holes and electrons meet. When it falls back to the ground state, the light comes out. Such an organic electroluminescent device is known to have properties such as self-emission, high luminance, high efficiency, low driving voltage, wide viewing angle, high contrast, and high speed response.

A material used as an organic material layer in an organic electroluminescent device can be classified into a light emitting material and a charge transporting material such as a hole injecting material, a hole transporting material, an electron transporting material, and an electron injecting material depending on functions. The light emitting material may be classified into a polymer type and a low molecular type depending on the molecular weight and may be classified into a fluorescent material derived from singlet excited state of electrons and a phosphorescent material derived from the triplet excited state of electrons according to an emission mechanism . Further, the light emitting material can be classified into blue, green, and red light emitting materials and yellow and orange light emitting materials necessary for realizing better natural color depending on the luminescent color.

On the other hand, when only one material is used as a light emitting material, there arises a problem that the maximum light emission wavelength shifts to a long wavelength due to intermolecular interaction, the color purity decreases, or the efficiency of the device decreases due to the light emission attenuating effect. A host / dopant system may be used as the light emitting material in order to increase the light emitting efficiency through the light emitting layer. When the dopant having a smaller energy band gap than the host forming the light emitting layer is mixed with a small amount of the light emitting layer, the excitons generated in the light emitting layer are transported to the dopant to emit light with high efficiency. At this time, since the wavelength of the host is shifted to the wavelength band of the dopant, light of a desired wavelength can be obtained depending on the type of dopant used.

In order for the organic electroluminescent device to sufficiently exhibit the above-described excellent characteristics, materials constituting the organic material layer in the device, such as a hole injecting material, a hole transporting material, a light emitting material, an electron transporting material, and an electron injecting material are supported by a stable and efficient material However, the development of a stable and efficient organic material layer material for an organic electroluminescence device has not been sufficiently developed yet. Therefore, there is a continuing need in the art for the development of new materials.

The technical problem to be solved by the present invention is to provide a spiro compound having excellent brightness and color purity of blue and a long life span.

A second object of the present invention is to provide an organic electroluminescent device including the spiro compound.

In order to accomplish the first technical object, the present invention provides a spiro compound represented by the following formula (1).

In Formula 1,

At least one of R 1 to R 8 is a substituted or unsubstituted heteroaryl group having 3 to 40 carbon atoms including nitrogen,

And the remaining are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted arylamino group having 6 to 40 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 40 carbon atoms, a substituted or unsubstituted aryl group having 6 to 40 carbon atoms , A substituted or unsubstituted heteroaryl group having 3 to 40 carbon atoms, a substituted or unsubstituted germanium group, a substituted or unsubstituted phosphorus atom, and a substituted or unsubstituted boron atom,

n, m, o, p, q and r are each independently an integer of 0 to 4,

R2, R3, R4, R5 or R6 may be the same or different from each other when two or more of n, m, o, p, q or r is 2 or more, and adjacent groups may be bonded to each other to form a substituted or unsubstituted aliphatic , Aromatic, heteroaliphatic or heteroaromatic rings.

In order to solve the second technical problem, the present invention provides a semiconductor device comprising: an anode; Cathode; And a layer including a spiro compound represented by Formula 1 interposed between the anode and the cathode.

The organic electroluminescent device including the spiro compound represented by the formula (1) in the organic material layer according to the present invention has excellent brightness, color purity and lifetime characteristics, and thus can be used for display and illumination.

1 is a schematic view of an organic electroluminescent device according to one embodiment of the present invention.
Description of the Related Art
10: substrate 20: anode
30: Hole injection layer 40: Hole transport layer
50: organic light emitting layer 60: electron transporting layer
70: electron injection layer 80: cathode

Hereinafter, the present invention will be described in more detail.

The spiro compound according to the present invention is characterized by being represented by the above formula (1).

In the spiro compounds according to the present invention, the substituents of the above formula (1) will be described more specifically.

delete

Specific examples of the alkyl group as the substituent used in the present invention include a methyl group, an ethyl group, a propyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, an isoamyl group, a hexyl group, a heptyl group, A halogen atom, a hydroxyl group, a nitro group, a cyano group, a trifluoromethyl group, a silyl group (in this case, a " alkylsilyl group "hereinafter), a substituted or unsubstituted amino group _{(-NH 2, -NH (R)} , -N (R ') (R''), where R, R' and R" are each independently a carbon number A hydrazine group, a hydrazone group, a carboxyl group, a sulfonic acid group, a phosphoric acid group, an alkyl group having 1 to 24 carbon atoms, a halogenated alkyl group having 1 to 24 carbon atoms (for example, an alkyl group having 1 to 24 carbon atoms , An alkenyl group having 2 to 24 carbon atoms, an alkynyl group having 2 to 24 carbon atoms, An aryl group having from 5 to 24 carbon atoms, an aryl group having from 5 to 24 carbon atoms, an arylalkyl group having from 6 to 24 carbon atoms, a heteroaryl group having from 3 to 24 carbon atoms, or a heteroarylalkyl group having from 3 to 24 carbon atoms.

Specific examples of the alkoxy group used as the substituent in the compound of the present invention include methoxy, ethoxy, propoxy, isobutyloxy, sec-butyloxy, pentyloxy, isoamyloxy, And can be substituted with substituents similar to those in the case of the alkyl group.

Specific examples of the halogen group which is a substituent used in the compound of the present invention include fluorine (F), chlorine (Cl), bromine (Br) and the like.

Specific examples of the aryl group as the substituent group used in the compound of the present invention include a phenyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 4-ethylphenyl group, Examples of the aryl group include phenyl group, 4-methylbiphenyl group, 4-ethylbiphenyl group, o-terphenyl group, m-terphenyl group, p-terphenyl group, 1-naphthyl group, , Anthryl group, phenanthryl group, pyrenyl group, fluorenyl group, tetrahydronaphthyl group and the like, which may be substituted with the same substituents as those in the case of the alkyl group.

Specific examples of the heteroaryl group used as the substituent in the compound of the present invention include pyridinyl, pyrimidinyl, triazinyl, indolinyl, quinolinyl, pyrrolidinyl, piperidinyl, An oxazolyl group, an oxadiazolyl group, a benzoxazolyl group, a thiazolyl group, a thiadiazolyl group, a benzothiazolyl group, a triazolyl group, an imidazolyl group, a benzoimidazole group, And at least one of the hydrogen atoms of the heteroaryl group may be substituted with the same substituent as the alkyl group.

In the present invention, the term "substituted or unsubstituted" refers to a group selected from the group consisting of deuterium, halogen, alkyl, alkenyl, alkoxy, aryl, arylalkyl, arylalkenyl, heteroaryl, Substituted or unsubstituted with at least one substituent selected from the group consisting of an acetylene group, a nitrile group and an acetylene group.

Specifically, the spiro compound according to the present invention may be any one of the compounds represented by Chemical Formulas (2) to (84) shown in the following Table 1.

[Table 1]

The production method of the spiro compound according to the present invention is specifically shown in the following Examples.

The present invention also relates to a fuel cell comprising an anode; Cathode; And a layer including a spiro compound represented by Formula 1 interposed between the anode and the cathode.

In this case, the layer containing the spiro compound is preferably a light emitting layer between the anode and the cathode, and a hole injecting layer, a hole transporting layer, an electron blocking layer, a hole blocking layer, an electron transporting layer and an electron injecting layer And at least one layer selected from the group consisting of

In addition, according to another embodiment of the present invention, the thickness of the light emitting layer is preferably 0.5 nm to 500 nm, and the light emitting layer may further include Ir (ppy) ₃ of the following structural formula.

[Ir (ppy) ₃ ]

As a specific example, a hole transport layer (HTL) may be additionally stacked, and an electron transport layer (ETL) may be further stacked between the cathode and the organic emission layer. An electron donor molecule having a low ionization potential is used as the material of the hole transport layer. A diamine, triamine or tetraamine derivative having a basic skeleton of triphenylamine is used as the hole transport layer. It is widely used.

In the present invention, the material for the hole transport layer is not particularly limited as long as it is commonly used in the art. For example, N, N'-bis (3-methylphenyl) -N, N'- , 1-biphenyl] -4,4'-diamine (TPD) or N, N'-di (naphthalene-1-yl) -N, N'-diphenylbenzidine (a-NPD).

A HIL (Hole Injection Layer) may be additionally deposited on the lower portion of the hole transport layer. The material for the hole injection layer is not particularly limited as long as it is commonly used in the art. For example, (4,4'-4 "-tri (N-carbazolyl) triphenyl-amine) or m-MTDATA (4,4'4" -tris- (3-methylphenylphenylamino) triphenylamine).

In addition, the electron transport layer used in the organic electroluminescent device according to the present invention can transport electrons supplied from the cathode smoothly to the organic luminescent layer and inhibit the movement of holes which are not bonded in the organic luminescent layer, . The material of the electron transport layer is not particularly limited as long as it is commonly used in the art. For example, oxadiazole derivative PBD, BMD, BND or Alq ₃ can be used.

Meanwhile, an electron injection layer (EIL) may be further formed on the electron transport layer to facilitate injection of electrons from the cathode to ultimately improve power efficiency. The electron injection layer material As long as it is commonly used in the art, it can be used without any particular limitation. For example, materials such as LiF, NaCl, CsF, Li ₂ O, and BaO can be used.

The organic electroluminescent device according to the present invention can be used for a display device, a display device, an element for a single color or a white light, and the like.

1 is a cross-sectional view showing the structure of an organic electroluminescent device of the present invention. The organic electroluminescent device according to the present invention includes an anode 20, a hole transport layer 40, an organic emission layer 50, an electron transport layer 60 and a cathode 80, The electron injecting layer 70 may be further formed. In addition, one or two intermediate layers may be further formed, or a hole blocking layer or an electron blocking layer may be further formed.

Referring to FIG. 1, the organic electroluminescent device of the present invention and its manufacturing method will be described as follows. First, an anode electrode material is coated on the substrate 10 to form an anode 20. Here, as the substrate 10, an organic substrate or a transparent plastic substrate which is excellent in transparency, surface smoothness, ease of handling, and waterproofness is used as a substrate used in a conventional organic EL device. As the material for the anode electrode, indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO ₂ ), zinc oxide (ZnO) and the like which are transparent and excellent in conductivity are used.

A hole injection layer 30 is formed on the anode 20 by vacuum thermal deposition or spin coating. Subsequently, a hole transport layer 40 is formed by vacuum thermal deposition or spin coating on the hole transport layer 30 above the hole injection layer 30. A hole blocking layer (not shown) is selectively formed on the organic light emitting layer 50 by a vacuum deposition method or a spin coating method to form a thin film on the organic light emitting layer 50 can do. In the case where holes are injected into the cathode through the organic light-emitting layer, the lifetime and the efficiency of the device are reduced, and thus the hole blocking layer plays a role of preventing such a problem by using a material having a very low HOMO (Highest Occupied Molecular Orbital) level . In this case, the hole blocking material to be used is not particularly limited, but it is required to have an ionization potential higher than that of the light emitting compound while having electron transporting ability. Typically, BAlq, BCP, TPBI and the like can be used.

After the electron transport layer 60 is deposited on the hole blocking layer by a vacuum deposition method or a spin coating method, an electron injection layer 70 is formed, and a cathode forming metal is deposited on the electron injection layer 70 in a vacuum heat- And the cathode 80 is formed by vapor deposition to complete the organic EL device. Here, as the metal for forming the cathode, lithium, magnesium, aluminum, aluminum-lithium, calcium, magnesium-magnesium, Mg-Ag), and a transmissive cathode using ITO or IZO can be used to obtain a top light-emitting device.

According to another embodiment of the present invention, at least one layer selected from the hole injecting layer, the hole transporting layer, the electron blocking layer, the light emitting layer, the hole blocking layer, the electron transporting layer and the electron injecting layer is formed by a single molecular deposition method or a solution process And the organic electroluminescent device according to the present invention can be used for a display device, a display device, and a monochromatic or white illumination device.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are provided only for the purpose of easier understanding of the present invention, and the present invention is not limited thereto.

< Example >

< Synthetic example  1> Preparation of the compound represented by the formula (2)

1) Synthesis of the compound represented by the formula 1-a

The compound represented by the formula (1-a) was synthesized by the following Reaction Scheme 1.

[Reaction Scheme 1]

(0.188 mol) of diphenylamine, 80 g (0.283 mol) of 2-bromoiodobenzene, 0.8 g (0.004 mol) of palladium acetate, 2.35 g (0.004 mol) of BINAP, 36.23 g (0.377 mol) of sodium tert-butoxide and 300 ml of toluene were added, and the mixture was refluxed for 48 hours. When the reaction was complete, it was filtered under hot conditions and extracted with toluene and water. The organic layer was washed with magnesium sulfate and concentrated under reduced pressure. The residue was purified by column chromatography using ethyl acetate and hexane (1: 20) as eluent to obtain 25.0 g (41.0%) of the compound represented by the formula (I-a).

2) Synthesis of the compound represented by the formula 1-b

The compound represented by the formula (1-b) was synthesized by the reaction scheme 2.

[Reaction Scheme 2]

20.0 g (0.051 mol) of the compound represented by the formula 1-a obtained from the above reaction formula 1 was placed in a 500 ml round-bottomed flask and completely dissolved in 200 ml of tetrahydrofuran, followed by cooling to -78 ° C and stirring. 42.4 ml (0.068 mol) of n-butyllithium was added slowly. When the addition was complete, stirring was continued for 2 hours. 8.76 g (0.035 mol) of 2-bromoanthraquinone was dissolved in 100 ml of tetrahydrofuran and added dropwise to the reaction solution. When the dropwise addition was completed, the mixture was stirred at room temperature. When the reaction was completed, water was added, stirred and extracted with ethyl acetate. The organic layer was dehydrated with magnesium sulfate and concentrated under reduced pressure to obtain a compound. The impure compound was used to proceed immediately to the next reaction. To the impure compound were added 80 ml of acetic acid and 5 ml of sulfuric acid and refluxed. After the reaction was completed, the reaction mixture was cooled to room temperature, filtered, and the filtered solid was washed with water. The solid was separated by column chromatography with ethyl acetate and hexane (1: 20) as eluent to obtain 19.2 g (73.9%) of the compound represented by formula (1-b).

3) Synthesis of the compound represented by the formula 1-c

The compound represented by the formula 1-c was synthesized by the following Reaction Scheme 3.

[Reaction Scheme 3]

In a 500 ml round-bottomed flask, 19.2 g (0.026 mol) of the compound represented by the formula 1-b obtained from the above reaction formula 2, 7.88 g (0.31 mol) of bis (pinacolato) diboron, [1,1'- 0.64 g (0.0008 mol) of potassium carbonate, 5.9 g (0.078 mol) of potassium acetate and 200 ml of toluene were placed in a 500 ml three-necked flask equipped with a reflux condenser, And refluxed for 6 hours. When the reaction was complete, it was filtered under hot conditions and extracted with toluene and water. The organic layer was dehydrated with magnesium sulfate, concentrated under reduced pressure, and separated by column chromatography with ethyl acetate and hexane (1: 20) to obtain 18.1 g (88.3%) of the compound represented by the formula (1-c).

4) Synthesis of Compound Represented by Chemical Formula 2

The compound represented by the formula (2) was synthesized by the following Reaction Scheme 4.

[Reaction Scheme 4]

8.0 g (0.01 mol) of the compound represented by the formula 1-c, 3.26 g (0.012 mol) of chlorodiphenyltriazine and 0.2 g (0.0002 mol) of tetrakistriphenylphosphine palladium obtained in the above reaction formula 3 were added to a 250 ml round bottom flask, 2.76 g (0.02 mol) of potassium carbonate, 50 ml of tetrahydrofuran, 50 ml of toluene and 20 ml of distilled water were placed and refluxed at 85 ° C for 8 hours. When the reaction was completed, it was cooled to room temperature and extracted with ethyl acetate and water. The organic layer was dehydrated with magnesium sulfate and concentrated under reduced pressure to obtain crystals. The residue was subjected to column chromatography using ethyl acetate and hexane as eluent to obtain 3.2 g (35.7%) of a compound represented by the formula (2).

¹ H NMR (CDCl ₃ ):? 8.72 (d, 4H, Ar-H),? 8.54 , 38H, Ar-H)

MS (MALDI-TOF): m / z = 893.4 [M] &lt; + &

< Synthetic example  2> Preparation of the compound represented by the general formula (50)

1) Synthesis of the compound represented by the formula 2-a

A compound represented by the formula (2-a) was synthesized by the following Reaction Scheme (5).

[Reaction Scheme 5]

After 25.0 g (0.147 mol) of diphenylamine and 19.05 ml (0.221 mol) of bromomethyl methyl ether were dissolved in 500 ml of tetrahydrofuran, 22.42 g (0.221 mol) of triethylamine was added dropwise to a 1,000 ml round- . After the reaction was completed, the reaction mixture was extracted with water and tetrahydrofuran. The organic layer was washed with magnesium sulfate to remove water, concentrated under reduced pressure, and then subjected to column chromatography using hexane and tetrahydrofuran as eluent to obtain Compound (85.0%).

2) Synthesis of the compound represented by the formula 2-b

A compound represented by the formula 2-b was synthesized by the following Reaction Scheme 6.

[Reaction Scheme 6]

10.0 g (0.047 mol) of the compound represented by the formula 2-a obtained from the above reaction formula 5 was placed in a 250 ml round bottom flask and completely dissolved in 100 ml of tetrahydrofuran, followed by cooling to -78 ° C and stirring. N-butyl lithium (29.3 ml, 0.047 mol) was added thereto. When the dropwise addition was completed, the mixture was stirred for 2 hours, and 5.65 g (0.0235 mol) of anthraquinone was dissolved in 50 ml of tetrahydrofuran and added dropwise to the reaction solution. When the dropwise addition was completed, the mixture was stirred at room temperature. When the reaction was completed, water was added, stirred and extracted with ethyl acetate. The organic layer was dehydrated with magnesium sulfate and concentrated under reduced pressure to obtain a compound. The impure compound was used to proceed immediately to the next reaction. To the impure compound were added 120 ml of acetic acid and 3 ml of sulfuric acid and the mixture was refluxed. After the reaction was completed, the reaction mixture was cooled to room temperature, filtered, and the filtered solid was washed with water. The solid was separated by column chromatography with ethyl acetate and hexane (1: 20) as eluent to obtain 9.4 g (78.5%) of the compound represented by formula (2-b).

3) Synthesis of the compound represented by the formula (50)

The compound represented by the general formula (50) was synthesized by the following Reaction Scheme 7.

[Reaction Scheme 7]

15.77 g (0.0657 mol) of sodium hydride and 40 ml of dimethylformamide were placed in a 500 ml round-bottomed flask and stirred at 0 ° C. 6 g (0.012 mol) of the compound represented by the formula 2-b obtained from the above reaction scheme 6 was dissolved in 200 ml of dimethylformamide, and the mixture was slowly added dropwise, followed by stirring for 1 hour. 6.8 g (0.025 mol) of chlorodiphenyltriazine was dissolved in 68 ml of dimethylformamide, and the mixture was added dropwise, followed by stirring for 5 hours. When the reaction was terminated, water was poured to form a solid. The solid was filtered, and methylene chloride and hexane were separated by column chromatography using a developing solvent and recrystallized from methylene chloride and hexane to obtain 5.5 g (43.6%) of the compound represented by the general formula (50).

_{^{1 H NMR (CDCl 3):}} δ 8.68 (d, 8H, Ar-H), δ 8.02 ~ 6.4 (m, 36H, Ar-H)

MS (MALDI-TOF): m / z = 972.4 [M] &lt; + &

< Synthetic example  3> Preparation of the compound represented by the formula (13)

In the same reaction conditions as in the synthesis of the compound represented by the formula (2) except that 1-chloro-3-diphenylamine-5-phenyltriazine was used instead of chlorodiphenyltriazine in the above reaction scheme 4, Compounds were synthesized.

_{^{1 H NMR (CDCl 3):}} δ 8.64 (d, 2H, Ar-H), δ 8.51 (s, 1H, Ar-H), δ 8.39 (d, 1H, Ar-H), δ 8.18 ~ 6.5 (m , 44H, Ar-H)

MS (MALDI-TOF): m / z = 984.4 [M] &lt; + &

< Synthetic example  4> Preparation of the compound represented by the formula (26)

In the same reaction conditions as in the synthesis of the compound represented by the formula (2) except that 2-bromo-6- (pyridin-4-yl) pyridine was used instead of chlorodiphenyltriazine in the above reaction scheme 4, Compound was synthesized

_{^{1 H NMR (CDCl 3):}} δ 8.72 (d, 2H, Ar-H), δ 8.46 (d, 2H, Ar-H), δ 7.9 ~ 6.4 (m, 36H, Ar-H)

MS (MALDI-TOF): m / z = 816.3 [M] &lt; + &

< Synthetic example  5> Preparation of the compound represented by the formula (53)

In the reaction scheme 6, 2-bromoanthraquinone was used instead of anthraquinone, and in the same experimental conditions for the synthesis of the compound represented by the general formula (2) except that phenylboronic acid was used in the reaction scheme 3, the compound represented by the general formula Were synthesized.

_{^{1 H NMR (CDCl 3):}} δ 8.68 (d, 8H, Ar-H), δ 8.02 ~ 6.4 (m, 40H, Ar-H)

MS (MALDI-TOF): m / z = 1048.4 [M] &lt; + &

< Example  1 to 5> The organic electroluminescent device  Produce

The ITO glass was patterned to have a light emitting area of 2 mm x 2 mm and then cleaned. DNTPD (700Å) of ITO on the organic material so that after a then attached to a vacuum chamber base pressure was 1 × 10 ^-6 torr substrate, NPD (300Å), the compound + Ir (ppy) ₃ prepared according to the present invention ( Alq ₃ (350 Å), LiF (5 Å), and Al (1,000 Å).

[DNTPD]

[NPD]

[Ir (ppy) ₃ ]

[Alq ₃ ]

< Comparative Example  1>

The organic electroluminescent device for the comparative example was fabricated in the same manner except that CBP of the following structural formula was used in place of the compound produced by the invention in the device structures of Examples 1 to 5 above.

[CBP]

[Table 2]

From the results of Examples 1 to 5, Comparative Example 1 and Table 2, the compound represented by Formula 1 according to the present invention exhibits excellent luminescence efficiency and the like as compared with CBP, which is a phosphorescence emitting material, Display device, illumination, and the like.

Claims (10)

delete delete A spiro compound which is any one of compounds represented by the following formulas (2) to (84) shown in Table 1 below:
[Table 1]

Anode;
Cathode; And
And a layer including the spiro compound according to claim 3 interposed between the anode and the cathode. 5. The method of claim 4,
Wherein the layer containing the spiro compound is a light emitting layer between the anode and the cathode. 6. The method of claim 5,
And at least one layer selected from the group consisting of a hole injecting layer, a hole transporting layer, an electron blocking layer, a hole blocking layer, an electron transporting layer and an electron injecting layer is further interposed between the anode and the cathode. 6. The method of claim 5,
Wherein the thickness of the light emitting layer is 0.5 nm to 500 nm. 6. The method of claim 5,
Wherein the light emitting layer further comprises Ir (ppy) ₃ of the following structural formula:
[Ir (ppy) ₃ ]

The method according to claim 6,
Wherein at least one layer selected from the group consisting of the hole injection layer, the hole transport layer, the electron blocking layer, the light emitting layer, the hole blocking layer, the electron transport layer and the electron injection layer is formed by a single molecular deposition method or a solution process. 5. The method of claim 4,
Wherein the organic electroluminescent device is used in a display device, a display device, or a device for monochromatic or white illumination.

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