WO2017052225A1 - 유기 발광 소자 - Google Patents
유기 발광 소자 Download PDFInfo
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- WO2017052225A1 WO2017052225A1 PCT/KR2016/010580 KR2016010580W WO2017052225A1 WO 2017052225 A1 WO2017052225 A1 WO 2017052225A1 KR 2016010580 W KR2016010580 W KR 2016010580W WO 2017052225 A1 WO2017052225 A1 WO 2017052225A1
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- Prior art keywords
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- light emitting
- host
- dipole moment
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- 239000000463 material Substances 0.000 claims abstract description 129
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- 238000000034 method Methods 0.000 claims description 27
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- 125000001072 heteroaryl group Chemical group 0.000 claims description 10
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 10
- 125000001637 1-naphthyl group Chemical group [H]C1=C([H])C([H])=C2C(*)=C([H])C([H])=C([H])C2=C1[H] 0.000 claims description 8
- 125000001622 2-naphthyl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C(*)C([H])=C([H])C2=C1[H] 0.000 claims description 8
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- 125000000748 anthracen-2-yl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C3C([H])=C([*])C([H])=C([H])C3=C([H])C2=C1[H] 0.000 claims description 6
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- UHXOHPVVEHBKKT-UHFFFAOYSA-N 1-(2,2-diphenylethenyl)-4-[4-(2,2-diphenylethenyl)phenyl]benzene Chemical compound C=1C=C(C=2C=CC(C=C(C=3C=CC=CC=3)C=3C=CC=CC=3)=CC=2)C=CC=1C=C(C=1C=CC=CC=1)C1=CC=CC=C1 UHXOHPVVEHBKKT-UHFFFAOYSA-N 0.000 description 2
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- IYYZUPMFVPLQIF-ALWQSETLSA-N dibenzothiophene Chemical group C1=CC=CC=2[34S]C3=C(C=21)C=CC=C3 IYYZUPMFVPLQIF-ALWQSETLSA-N 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 125000003983 fluorenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3CC12)* 0.000 description 1
- 150000002240 furans Chemical class 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 125000002883 imidazolyl group Chemical group 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 229910003437 indium oxide Inorganic materials 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- 125000001041 indolyl group Chemical group 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000004491 isohexyl group Chemical group C(CCC(C)C)* 0.000 description 1
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 125000002183 isoquinolinyl group Chemical group C1(=NC=CC2=CC=CC=C12)* 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- XNUVVHVFAAQPQY-UHFFFAOYSA-L manganese(2+) quinolin-8-olate Chemical compound N1=CC=CC2=CC=CC(=C12)[O-].[Mn+2].N1=CC=CC2=CC=CC(=C12)[O-] XNUVVHVFAAQPQY-UHFFFAOYSA-L 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 150000002790 naphthalenes Chemical class 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 125000001971 neopentyl group Chemical group [H]C([*])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000004866 oxadiazoles Chemical class 0.000 description 1
- 125000002971 oxazolyl group Chemical group 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 150000002964 pentacenes Chemical class 0.000 description 1
- 125000003538 pentan-3-yl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- FVDOBFPYBSDRKH-UHFFFAOYSA-N perylene-3,4,9,10-tetracarboxylic acid Chemical compound C=12C3=CC=C(C(O)=O)C2=C(C(O)=O)C=CC=1C1=CC=C(C(O)=O)C2=C1C3=CC=C2C(=O)O FVDOBFPYBSDRKH-UHFFFAOYSA-N 0.000 description 1
- 150000002987 phenanthrenes Chemical class 0.000 description 1
- 150000005041 phenanthrolines Chemical class 0.000 description 1
- 125000005561 phenanthryl group Chemical group 0.000 description 1
- 125000001484 phenothiazinyl group Chemical group C1(=CC=CC=2SC3=CC=CC=C3NC12)* 0.000 description 1
- 238000005424 photoluminescence Methods 0.000 description 1
- 125000004592 phthalazinyl group Chemical group C1(=NN=CC2=CC=CC=C12)* 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002098 polyfluorene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920000123 polythiophene Polymers 0.000 description 1
- 150000004032 porphyrins Chemical class 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000003373 pyrazinyl group Chemical group 0.000 description 1
- 150000003220 pyrenes Chemical class 0.000 description 1
- 125000001725 pyrenyl group Chemical group 0.000 description 1
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical group C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- 229940083082 pyrimidine derivative acting on arteriolar smooth muscle Drugs 0.000 description 1
- 150000003230 pyrimidines Chemical class 0.000 description 1
- 125000000714 pyrimidinyl group Chemical group 0.000 description 1
- 125000000168 pyrrolyl group Chemical group 0.000 description 1
- 125000002294 quinazolinyl group Chemical group N1=C(N=CC2=CC=CC=C12)* 0.000 description 1
- 125000002943 quinolinyl group Chemical group N1=C(C=CC2=CC=CC=C12)* 0.000 description 1
- 125000001567 quinoxalinyl group Chemical group N1=C(C=NC2=CC=CC=C12)* 0.000 description 1
- YYMBJDOZVAITBP-UHFFFAOYSA-N rubrene Chemical compound C1=CC=CC=C1C(C1=C(C=2C=CC=CC=2)C2=CC=CC=C2C(C=2C=CC=CC=2)=C11)=C(C=CC=C2)C2=C1C1=CC=CC=C1 YYMBJDOZVAITBP-UHFFFAOYSA-N 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 125000003548 sec-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 150000003413 spiro compounds Chemical class 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 125000005504 styryl group Chemical group 0.000 description 1
- UWRZIZXBOLBCON-UHFFFAOYSA-N styrylamine group Chemical group C(=CC1=CC=CC=C1)N UWRZIZXBOLBCON-UHFFFAOYSA-N 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229940042055 systemic antimycotics triazole derivative Drugs 0.000 description 1
- 125000001113 thiadiazolyl group Chemical group 0.000 description 1
- 125000000335 thiazolyl group Chemical group 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- IBBLKSWSCDAPIF-UHFFFAOYSA-N thiopyran Chemical compound S1C=CC=C=C1 IBBLKSWSCDAPIF-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- KWQNQSDKCINQQP-UHFFFAOYSA-K tri(quinolin-8-yloxy)gallane Chemical compound C1=CN=C2C(O[Ga](OC=3C4=NC=CC=C4C=CC=3)OC=3C4=NC=CC=C4C=CC=3)=CC=CC2=C1 KWQNQSDKCINQQP-UHFFFAOYSA-K 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- WLKSSWJSFRCZKL-UHFFFAOYSA-N trimethylgermanium Chemical group C[Ge](C)C WLKSSWJSFRCZKL-UHFFFAOYSA-N 0.000 description 1
- 125000003960 triphenylenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C3=CC=CC=C3C12)* 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
- HTPBWAPZAJWXKY-UHFFFAOYSA-L zinc;quinolin-8-olate Chemical compound [Zn+2].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 HTPBWAPZAJWXKY-UHFFFAOYSA-L 0.000 description 1
Images
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- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
- H10K50/13—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
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- H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2105/00—Planar light sources
- F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
- F21Y2115/15—Organic light-emitting diodes [OLED]
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- H10K50/80—Constructional details
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- H10K50/81—Anodes
- H10K50/818—Reflective anodes, e.g. ITO combined with thick metallic layers
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- H10K50/82—Cathodes
- H10K50/828—Transparent cathodes, e.g. comprising thin metal layers
Definitions
- the present specification relates to an organic light emitting device.
- the organic light emitting phenomenon is an example of converting an electric current into visible light by an internal process of a specific organic molecule.
- the principle of the organic light emitting phenomenon is as follows.
- An organic light emitting device using this principle may generally be composed of an organic material layer including a cathode, an anode, and an organic material layer disposed therebetween, such as a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer.
- the materials used in the organic light emitting device are pure organic materials or complex compounds in which organic materials and metals are complexed, and depending on the purpose, hole injection materials, hole transport materials, light emitting materials, electron transport materials, electron injection materials, etc. It can be divided into.
- the hole injection material or the hole transport material an organic material having a p-type property, that is, an organic material which is easily oxidized and has an electrochemically stable state during oxidation, is mainly used.
- organic materials having n-type properties that is, organic materials that are easily reduced and have an electrochemically stable state at the time of reduction are mainly used.
- the light emitting layer material a material having a p-type property and an n-type property at the same time, that is, a material having a stable form in both oxidation and reduction states, and a material having high luminous efficiency that converts it to light when excitons are formed desirable.
- the present specification is to provide an organic light emitting device having excellent viewing angle characteristics and excellent color purity.
- a transparent electrode A reflective electrode provided to face the transparent electrode; And at least one organic material layer including a light emitting layer provided between the transparent electrode and the reflective electrode.
- the light emitting layer includes two or more light emitting materials
- an organic light emitting device in which a difference between a dipole moment value of any one of the light emitting materials and a dipole moment value of the other light emitting material is 1.5 Debye or more.
- the present specification provides a display device including the organic light emitting device described above.
- the present specification provides a lighting device including the organic light emitting device described above.
- the organic light emitting diode according to the exemplary embodiment of the present specification may increase the half width of the emission spectrum to improve viewing angle characteristics.
- the organic light emitting device can control the color purity of the emission spectrum, and when applied to an illumination device, an improvement in color rendering index (CRI) can be expected.
- CRI color rendering index
- the opportunity for selecting the host material and / or the dopant included in the light emitting layer increases. Therefore, it is possible to provide an organic light emitting device having a high luminous efficiency by using a host and / or a dopant advantageous to improve the performance of the device.
- FIG. 1 is a view showing an organic light emitting device according to an exemplary embodiment of the present specification.
- FIG. 3 is a diagram showing emission spectra of the organic light emitting diodes of Comparative Examples 1 and 3.
- FIG. 3 is a diagram showing emission spectra of the organic light emitting diodes of Comparative Examples 1 and 3.
- FIG. 5 is a diagram illustrating current densities according to voltages of organic light emitting diodes of Comparative Examples 1 and 2.
- FIG. 5 is a diagram illustrating current densities according to voltages of organic light emitting diodes of Comparative Examples 1 and 2.
- FIG. 6 is a diagram showing emission spectra of the organic light emitting diodes of Comparative Examples 1 and 2.
- FIG. 6 is a diagram showing emission spectra of the organic light emitting diodes of Comparative Examples 1 and 2.
- FIG. 7 is a diagram illustrating quantum efficiency according to currents of the organic light emitting diodes of Comparative Examples 1 and 2.
- FIG. 7 is a diagram illustrating quantum efficiency according to currents of the organic light emitting diodes of Comparative Examples 1 and 2.
- FIG. 8 is a diagram illustrating emission spectra of Comparative Example 1, Comparative Example 2, and Example 1.
- FIG. 8 is a diagram illustrating emission spectra of Comparative Example 1, Comparative Example 2, and Example 1.
- FIG. 9 is a diagram normalizing the emission spectra of Comparative Example 1, Comparative Example 2, and Example 1.
- FIG. 9 is a diagram normalizing the emission spectra of Comparative Example 1, Comparative Example 2, and Example 1.
- a transparent electrode A reflective electrode provided to face the transparent electrode; And at least one organic material layer including a light emitting layer provided between the transparent electrode and the reflective electrode.
- the light emitting layer includes two or more light emitting materials, and a difference between a dipole moment value of one of the light emitting materials and a dipole moment value of the other light emitting material is 1.5 Debye or more. do.
- the difference between the dipole moment value of any one of the light emitting materials and the dipole moment value of the other light emitting material is 1.5 or more and 10 or less.
- the dipole moment value includes only a light emitting material having a small dipole moment value
- a full width at half maximum (FWHM) is small, which causes a problem that a viewing angle characteristic is deteriorated when applied to a display device.
- the half width is increased but color purity may be reduced.
- the organic light emitting device capable of increasing the half width and controlling the viewing angle characteristic.
- the organic light emitting device according to the exemplary embodiment of the present specification can control the half width of the emission spectrum, and when applied to an illumination device, an improvement in color rendering index (CRI) can be expected.
- CRI color rendering index
- an organic light emitting device including two kinds of light emitting materials having a difference in dipole moment value of 1.5 divisions or more can provide excellent color purity while maintaining a rise in half width, and thus, various light emission.
- the material may be used, thereby increasing the range of material selection, thereby maximizing the performance of the organic light emitting device.
- half-width means the width of a distribution corresponding to one half of the peak of the emission spectrum.
- color purity means a degree of reproducing one color, and the smaller the half-value width, the more the color purity increases, but the amount of change in luminance according to the viewing angle is increased.
- the "viewing angle” refers to a possible range of viewing the screen, and in general, in the case of blue photoluminescence having a small half width (FWHM), the wider the half width, the viewing angle is improved. As the FWHM of the spectrum is smaller, the color purity is increased, but the luminance variation according to the viewing angle is increased, so that the image quality characteristics are deteriorated when the display is applied. Therefore, a spectrum having an appropriate FWHM is required.
- color rendering index refers to Ra as an ability to recreate natural colors and has a value from 0 to 100. This is a numerical representation of the color reproduction ability of the subject seen under the light source with the summer noon sunlight at 5,500 K as the standard light (100 Ra).
- the spectrum of sunlight has a broad spectrum in the visible light wavelength range. The wider the half width (FWHM) of the organic light emitting device is, the more advantageous it is, and the higher the color rendering index, the better the light source is closer to the natural light.
- the dipole moment is a physical quantity indicating the degree of polarity and may be calculated by Equation 1 below.
- the value of the dipole moment can be obtained.
- the molecular density can be obtained by calculating charges and dipoles for each atom using a method called Hirshfeld Charge Analysis, and calculating them according to the following formula, and the dipole moment is put into the above equation 1 Obtain Dipole Moment.
- the light emitting layer comprises a dopant; And two or more hosts, wherein a difference between the dipole moment value of one of the two or more hosts and the dipole moment value of the other host is 1.5 devices or more.
- the content of the dopant in the light emitting layer is more than 0% to 30% by weight based on the total weight, the content of the two or more hosts is 70% or more than 100% by weight relative to the total weight. to be.
- the triplet energy of at least one of the two hosts in the light emitting layer is greater than the triplet energy of the dopant.
- the two types of hosts in the light emitting layer are more preferably larger than the triplet energy of the dopant.
- the dopant may include a phosphorescent dopant or a fluorescent dopant.
- the phosphorescent dopant and the fluorescent dopant may use a dopant generally used in the art.
- two types of hosts having a difference between the dipole moment value of one host and the dipole moment value of another host of 1.5 devices or more have a mixed host structure.
- the mixed host structure means that two or more types of host materials are mixed and provided in the light emitting layer.
- the ratio of the host material having a large dipole moment value among the two host materials and the host material having a small dipole moment value among the two host materials has a weight ratio of 1: 9 to 9: 1. Included as.
- the content of the host having a small dipole moment value among the two hosts is 10 wt% or more and less than 100 wt% based on the total weight of the hosts, and the dipole moment value among the two hosts.
- the content of this large host is greater than 0 weight percent up to 90 weight percent based on the total weight of the host.
- two types of hosts having a difference between the dipole moment value of one of the hosts and the dipole moment value of the other host of 1.5 devices or more have a layer by layer host structure.
- the layered host structure refers to a structure in which two or more types of host materials are formed by layering each other.
- the layered host structure includes a first host layer and a second host layer, wherein the first host layer has a dipole moment value of one host different from a dipole moment value of the one host.
- each of the first host layer and the second host layer may further include a dopant.
- the content of the dopant included in the first host layer and the second host layer is the same or different from each other.
- the types of dopants included in the first host layer and the second host layer are the same as or different from each other.
- the type and content of the dopant of the first host layer and the second host layer may be adjusted by those skilled in the art in terms of driving voltage, efficiency, and / or lifetime of the device.
- the first host layer including the host material having a relatively large dipole moment value may be positioned in a light emitting layer relatively far from the reflective electrode, that is, the metal electrode, to improve the light efficiency.
- adjacent to the transparent electrode means that the transparent electrode and the first host layer are physically close, and not only when the first host layer is provided in contact with the transparent electrode, but also between the first host layer and the transparent electrode. It may also mean that the additional organic layer in the.
- the transparent electrode may be an anode
- the reflective electrode may serve as a cathode
- the transparent electrode may be a cathode, and the reflective electrode may act as an anode.
- the light emitting layer includes a peak wavelength of the photoluminescence spectrum of 420 nm to 480 nm.
- the light emitting layer includes a peak wavelength of a photoluminescence spectrum of 530 nm to 590 nm.
- Peak wavelength herein means the wavelength at the maximum of the spectral distribution.
- the organic light emitting device includes a light emitting layer of blue fluorescence.
- the peak wavelength of the photoluminescence spectrum When including the peak wavelength of the photoluminescence spectrum, it may have a wavelength band applicable to the display.
- the half width of the organic light emitting diode is a light emitting layer having a difference between a dipole moment value for any one of two or more light emitting materials and a dipole moment value for the other light emitting material of less than 1.5 dibyes. It is 1.03 times or more compared with the half value width of the organic light emitting element containing.
- At least one of the two light emitting materials having a difference between the dipole moment value of the one light emitting material and the dipole moment value of the other light emitting material is 1.5 Debye or more may form an aromatic ring.
- both of the two light emitting materials having a difference between the dipole moment value of any one of the light emitting materials and the dipole moment value of the other light emitting material of 1.5 Debye or more include an aromatic ring.
- the meaning of including the aromatic ring means not only a case in which the compound is included as a core structure in the compound structure, but also a case in which the aromatic ring is included as a substituent.
- the aromatic ring of the present specification is not limited to a hydrocarbon ring having an aromatic structure, and may also mean a case including one or more hetero atoms instead of carbon atoms.
- Hydrocarbon ring in the aromatic ring of the present specification may be an aryl group.
- the aryl group is a monocyclic aryl group, carbon number is not particularly limited, but preferably 6 to 25 carbon atoms.
- the monocyclic aryl group may be a phenyl group, a biphenyl group, a terphenyl group, etc., but is not limited thereto.
- Carbon number is not particularly limited when the aryl group is a polycyclic aryl group. It is preferable that it is C10-24.
- the polycyclic aryl group may be naphthyl group, triphenylenyl group, anthracenyl group, phenanthryl group, pyrenyl group, perrylenyl group, chrysenyl group, fluorenyl group, etc., but is not limited thereto.
- the heterocycle in the aromatic ring of the present specification may be a heteroaryl group.
- the heteroaryl group includes one or more atoms other than carbon in the aryl group and heteroatoms, and specifically, the heteroatoms include one or more atoms selected from the group consisting of O, N, Se, and S, and the like. Can be. Although carbon number is not specifically limited, It is preferable that it is C2-C60.
- heteroaryl groups include thiophene group, furan group, pyrrole group, imidazole group, thiazole group, oxazole group, oxadiazole group, triazole group, pyridyl group, bipyridyl group, pyrimidyl group, triazine group, triazole group, Acridyl group, pyridazine group, pyrazinyl group, quinolinyl group, quinazoline group, quinoxalinyl group, phthalazinyl group, pyrido pyrimidinyl group, pyrido pyrazinyl group, pyrazino pyrazinyl group, isoquinoline group , Indole group, carbazole group, benzoxazole group, benzimidazole group, benzothiazole group, benzocarbazole group, benzothiophene group, dibenzothiophene group, benzofuranyl group, phenan
- the alkyl group may be linear or branched chain, carbon number is not particularly limited, but is preferably 1 to 30.
- Specific examples include methyl, ethyl, propyl, n-propyl, isopropyl, butyl, n-butyl, isobutyl, tert-butyl, sec-butyl, 1-methyl-butyl, 1-ethyl-butyl, pentyl, n-pentyl , Isopentyl, neopentyl, tert-pentyl, hexyl, n-hexyl, 1-methylpentyl, 2-methylpentyl, 4-methyl-2-pentyl, 3,3-dimethylbutyl, 2-ethylbutyl, heptyl, n -Heptyl, 1-methylhexyl, cyclopentylmethyl, cyclohexylmethyl, octyl, n-o
- the dipole moment value of the two kinds of light emitting materials having a difference between the dipole moment value of the one light emitting material and the dipole moment value of the other light emitting material is 1.5 Debye or more.
- the value of the dipole moment of the small luminescent material may be less than or equal to 1 divide.
- the dipole moment value of the two kinds of light emitting materials having a difference between the dipole moment value of the one light emitting material and the dipole moment value of the other one of the light emitting materials is 1.5 Debye or more.
- the luminescent material may consist of hydrocarbons or may have symmetry.
- the dipole moment value of the two kinds of light emitting materials having a difference between the dipole moment value of the one light emitting material and the dipole moment value of the other light emitting material is 1.5 Debye or more.
- the dipole moment value of the luminescent material may be at least 2 dividers.
- light emission having a relatively large dipole moment value among two light emitting materials having a difference between the dipole moment value of the one light emitting material and the dipole moment value of the other light emitting material is 1.5 Debye or more.
- the material may further comprise heteroatoms and / or transition metals, or may have an asymmetric structure.
- the dipole moment value of the two kinds of light emitting materials having a difference between the dipole moment value of the one light emitting material and the dipole moment value of the other light emitting material is 1.5 Debye or more.
- Larger luminescent materials include anthracene.
- the dipole moment value of the two kinds of light emitting materials having a difference between the dipole moment value of the one light emitting material and the dipole moment value of the other light emitting material is 1.5 Debye or more.
- Larger luminescent materials include anthracenes and heterocycles.
- the dipole moment value of the two kinds of light emitting materials having a difference between the dipole moment value of the one light emitting material and the dipole moment value of the other light emitting material is 1.5 Debye or more.
- Larger luminescent materials include anthracene and heterocycles comprising one or two or more heteroatoms of N, O and S.
- the dipole moment value of the two kinds of light emitting materials having a difference between the dipole moment value of the one light emitting material and the dipole moment value of the other light emitting material is 1.5 Debye or more.
- Larger luminescent materials include anthracene; And dibenzofuran, naphthobenzofuran, dibenzothiophene, carbazole, benzocarbazole, xanthene, fluorenone, chromman, benzothiophene, spirofluorene xanthene and benzimidazophenanthridine ,
- the dibenzofuran, naphthobenzofuran, dibenzothiophene, carbazole, benzocarbazole, xanthene, fluorenone, chromman, benzothiophene, spirofluorene xanthene and benzimidazofenanthridine are alkyl groups and It may be further substituted with one or two or more substituents selected from the group consisting of aryl groups.
- the dipole moment value of the two kinds of light emitting materials having a difference between the dipole moment value of the one light emitting material and the dipole moment value of the other light emitting material is 1.5 Debye or more. Larger luminescent materials may be selected from the following structures.
- the difference between the dipole moment value of any one of the two light emitting materials and the dipole moment value of the other light emitting material is 1.5 Debye or more, and the structure, type, and The dipole moment value is not limited.
- the organic light emitting device of the present specification includes at least two light emitting materials as described above, and the light emitting layer having a difference between the dipole moment value of one of the light emitting materials and the dipole moment value of the other light emitting material is 1.5 Debye or more. Except to include, may be prepared by materials and methods known in the art.
- the organic light emitting device of the present specification may be manufactured by sequentially stacking an anode, an organic material layer, and a cathode on a substrate.
- the anode is formed by depositing a metal or conductive metal oxide or an alloy thereof on the substrate by using a physical vapor deposition (PVD) method such as sputtering or e-beam evaporation.
- PVD physical vapor deposition
- an organic material layer including a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, an electron transport layer, and an electron injection layer thereon, and then depositing a material that can be used as a cathode thereon.
- an organic light emitting device may be manufactured by sequentially depositing a cathode material, an organic material layer, and an anode material on a substrate.
- an organic light emitting device may be manufactured by sequentially depositing an anode material, an organic material layer, and a cathode material on a substrate.
- the organic material layer of the organic light emitting device of the present specification may have a multilayer structure in which one or more organic material layers are stacked.
- the organic light emitting device further includes one or two 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 electron blocking layer and a hole blocking layer. can do.
- the structure of the organic light emitting device of the present specification may have the same structure as shown in FIG. 1, but is not limited thereto.
- FIG. 1 illustrates a structure of an organic light emitting device in which a transparent electrode 201, a hole transport layer 301, an emission layer 401, an electron transport layer 501, and a reflective electrode 601 are sequentially stacked on a substrate 101.
- the difference in the dipole moment value of at least two of the light emitting materials of the light emitting layer 401 is 1.5 divisions or more.
- 1 is an exemplary structure according to an exemplary embodiment of the present specification, may further include other organic material layers, and may not include other organic material layers.
- the organic material layers may be formed of the same material or different materials.
- the anode material a material having a large work function is generally preferred to facilitate hole injection into the organic material layer.
- the positive electrode material that can be used in the present invention include metals such as vanadium, chromium, copper, zinc and gold or alloys thereof; Metal oxides such as zinc oxide, indium oxide, indium tin oxide (ITO), indium zinc oxide (IZO); ZnO: Al or SnO 2 : Combination of metals and oxides such as Sb; Conductive polymers such as poly (3-methylthiophene), poly [3,4- (ethylene-1,2-dioxy) thiophene] (PEDOT), polypyrrole and polyaniline, and the like, but are not limited thereto.
- the cathode material is generally a material having a small work function to facilitate electron injection into the organic material layer.
- the negative electrode material include metals such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin, and lead or alloys thereof; Multilayer structure materials such as LiF / Al or LiO 2 / Al, and the like, but are not limited thereto.
- the hole injection layer is a layer for injecting holes from an electrode.
- the hole injection material has a capability of transporting holes to have a hole injection effect at an anode, and has an excellent hole injection effect for a light emitting layer or a light emitting material.
- the compound which prevents the excitons from moving to the electron injection layer or the electron injection material, and is excellent in thin film formation ability is preferable.
- the highest occupied molecular orbital (HOMO) of the hole injection material is between the work function of the positive electrode material and the HOMO of the surrounding organic material layer.
- hole injection material examples include metal porphyrin, oligothiophene, arylamine-based organic material, hexanitrile hexaazatriphenylene-based organic material, quinacridone-based organic material, and perylene-based Organic materials, anthraquinone, and polyaniline and polythiophene-based conductive polymers, but are not limited thereto.
- the hole transport layer is a layer that receives holes from the hole injection layer and transports holes to the light emitting layer.
- the hole transport material is a material capable of transporting holes from the anode or the hole injection layer to the light emitting layer.
- the material is suitable. Specific examples thereof include an arylamine-based organic material, a conductive polymer, and a block copolymer having a conjugated portion and a non-conjugated portion together, but are not limited thereto.
- the light emitting material is a material capable of emitting light in the visible region by transporting and combining holes and electrons from the hole transport layer and the electron transport layer, respectively, and a material having good quantum efficiency with respect to fluorescence or phosphorescence is preferable.
- Specific examples thereof include 8-hydroxyquinoline aluminum complex (Alq 3 ); Carbazole series compounds; Dimerized styryl compounds; BAlq; 10-hydroxybenzoquinoline-metal compound; Benzoxazole, benzthiazole and benzimidazole series compounds; Poly (p-phenylenevinylene) (PPV) -based polymers; Spiro compounds; Polyfluorene, rubrene and the like, but are not limited thereto.
- the light emitting layer may include a host material and a dopant material.
- the host material is a condensed aromatic ring derivative or a heterocyclic containing compound.
- the condensed aromatic ring derivatives include anthracene derivatives, pyrene derivatives, naphthalene derivatives, pentacene derivatives, phenanthrene compounds, and fluoranthene compounds
- the heterocyclic containing compounds include carbazole derivatives, dibenzofuran derivatives and ladder types. Furan compounds, pyrimidine derivatives, and the like, but are not limited thereto.
- the light emitting layer includes a compound represented by the following Formula 1-A.
- n1 is an integer of 1 or more
- Ar7 is a substituted or unsubstituted monovalent or higher benzofluorene group; Substituted or unsubstituted monovalent or higher fluoranthene group; A substituted or unsubstituted monovalent or higher pyrene group; Or a substituted or unsubstituted monovalent or higher chrysene group,
- L4 is a direct bond; Substituted or unsubstituted arylene group; Or a substituted or unsubstituted heteroarylene group,
- Ar8 and Ar9 are the same as or different from each other, and each independently a substituted or unsubstituted aryl group; Substituted or unsubstituted silyl group; Substituted or unsubstituted germanium group; Substituted or unsubstituted alkyl group; Substituted or unsubstituted arylalkyl group; Or a substituted or unsubstituted heteroaryl group, or combine with each other to form a substituted or unsubstituted ring,
- n1 is 2 or more
- the structures in two or more parentheses are the same or different from each other.
- the organic material layer includes a light emitting layer, and the light emitting layer includes a compound represented by Chemical Formula 1-A as a dopant of the light emitting layer.
- L4 is a direct bond.
- n1 is 2.
- Ar7 is a divalent pyrene group unsubstituted or substituted with deuterium, a methyl group, an ethyl group, or a tert-butyl group.
- Ar8 and Ar9 are the same as or different from each other, and each independently represent a substituted or unsubstituted aryl group having 6 to 30 carbon atoms.
- Ar8 and Ar9 are the same as or different from each other, and each independently represent an aryl group having 6 to 30 carbon atoms unsubstituted or substituted with an alkyl group having 1 to 30 carbon atoms.
- Ar8 and Ar9 are the same as or different from each other, and each independently represent a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms.
- Ar8 and Ar9 are the same as or different from each other, and each independently a substituted or unsubstituted dibenzofuranyl group.
- Ar8 and Ar9 are the same as or different from each other, and each independently represent an aryl group having 6 to 30 carbon atoms unsubstituted or substituted with a germanium group substituted with an alkyl group having 1 to 30 carbon atoms.
- Ar8 and Ar9 are the same or different from each other, and each independently an aryl group unsubstituted or substituted with a trimethylgermanium group.
- Ar8 and Ar9 are the same as or different from each other, and each independently represent a substituted or unsubstituted phenyl group.
- Ar8 and Ar9 are the same as or different from each other, and each independently a phenyl group unsubstituted or substituted with a methyl group, or a dibenzofuranyl group.
- Ar8 and Ar9 is a phenyl group unsubstituted or substituted with a trimethylgernium group.
- Chemical Formula 1-A is represented by the following compound.
- the organic material layer includes a light emitting layer, and the light emitting layer includes a compound represented by Chemical Formula 2-A.
- G11 is a phenyl group, 1-naphthyl group, 2-naphthyl group, 1-anthryl group, 2-anthryl group, 1-phenanthryl group, 2-phenanthryl group, 3-phenanthryl group, 4-phenanthryl group, 9-phenanthryl group, 1-naphthacenyl group, 2-naphthacenyl group, 9-naphthacenyl group, 1-pyrenyl group, 2-pyrenyl group, 4-pyrenyl group, 3-methyl-2-naphthyl group, 4- Methyl-1-naphthyl group, or ego,
- G12 is a phenyl group, 1-naphthyl group, 2-naphthyl group, 1-anthryl group, 2-anthryl group, 9-anthryl group, 1-phenanthryl group, 2-phenanthryl group, 3-phenanthryl group, 4-phenanthryl group, 9-phenanthryl group, 1-naphthacenyl group, 2-naphthacenyl group, 9-naphthasenyl group, 1-pyrenyl group, 2-pyrenyl group, 4-pyrenyl group, 2-biphenylyl group , 3-biphenylyl group, 4-biphenylyl group, p-terphenyl-4-yl group, p-terphenyl-3-yl group, p-terphenyl-2-yl group, m-terphenyl-4-yl group, m -Terphenyl-3-yl group, m-terphenyl-2-yl group,
- G13 and G14 are the same as or different from each other, and each independently hydrogen; Substituted or unsubstituted alkyl group; Substituted or unsubstituted alkoxy group; Substituted or unsubstituted aryl group; Or a substituted or unsubstituted heteroaryl group,
- g12 is an integer of 1 to 5
- g13 and g14 are each an integer of 1 to 4,
- g12 to g14 are each two or more, the structures in two or more parentheses are the same or different from each other.
- the organic material layer includes a light emitting layer
- the light emitting layer includes a compound represented by Formula 2-A as a host of the light emitting layer.
- G11 is a 1-naphthyl group.
- the G12 is a 2-naphthyl group.
- the G13 and G14 is hydrogen.
- Formula 2-A is represented by the following compound.
- the fluorescent light emitting layer may be distyrylarylene (DSA), distyrylarylene derivative, distyrylbenzene (DSB), distyrylbenzene derivative, or DPVBi (4,4'-bis (2,2 ') as a host material. 1 or 2 or more are selected from the group consisting of -diphenyl vinyl) -1,1'-biphenyl), DPVBi derivatives, spiro-DPVBi and spiro-6P (spiro-sexyphenyl).
- the fluorescent layer is selected from the group consisting of styrylamine, perylene, and DSBP (distyrylbiphenyl) as a dopant material.
- the electron injection layer is a layer that injects electrons from an electrode, has an ability of transporting electrons, has an electron injection effect from a cathode, an electron injection effect with respect to a light emitting layer or a light emitting material, and hole injection of excitons generated in the light emitting layer.
- the compound which prevents the movement to a layer and is excellent in thin film formation ability is preferable.
- fluorenone anthraquinodimethane, diphenoquinone, thiopyran dioxide, oxazole, oxadiazole, triazole, imidazole, perylenetetracarboxylic acid, preorenylidene methane, anthrone and the like and derivatives thereof, metal Complex compounds, nitrogen-containing five-membered ring derivatives, and the like, but are not limited thereto.
- Examples of the metal complex compound include 8-hydroxyquinolinato lithium, bis (8-hydroxyquinolinato) zinc, bis (8-hydroxyquinolinato) copper, bis (8-hydroxyquinolinato) manganese, Tris (8-hydroxyquinolinato) aluminum, tris (2-methyl-8-hydroxyquinolinato) aluminum, tris (8-hydroxyquinolinato) gallium, bis (10-hydroxybenzo [h] Quinolinato) beryllium, bis (10-hydroxybenzo [h] quinolinato) zinc, bis (2-methyl-8-quinolinato) chlorogallium, bis (2-methyl-8-quinolinato) ( o-cresolato) gallium, bis (2-methyl-8-quinolinato) (1-naphtolato) aluminum, bis (2-methyl-8-quinolinato) (2-naphtolato) gallium, It is not limited to this.
- the hole blocking layer is a layer that blocks the reaching of the cathode of the hole, and may be generally formed under the same conditions as the hole injection layer. Specifically, there are oxadiazole derivatives, triazole derivatives, phenanthroline derivatives, BCP (Bathocuproine), and aluminum complexes, but are not limited thereto.
- the organic light emitting device may be a top emission type, a bottom emission type, or a double side emission type according to a material used.
- the organic light emitting diode according to the present disclosure may be a normal type in which the lower electrode is an anode and the upper electrode is a cathode, or may be an inverted type in which the lower electrode is a cathode and the upper electrode is an anode.
- the structure according to the exemplary embodiment of the present specification may act on a principle similar to that applied to an organic light emitting device in an organic electronic device including an organic solar cell, an organic photoconductor, and an organic transistor.
- a glass substrate (corning 7059 glass) coated with ITO (indium tin oxide) at a thickness of 1,000 ⁇ was placed in distilled water in which detergent was dissolved and ultrasonically cleaned. At this time, Fischer Co. was used as a detergent and Millipore Co. was used as distilled water. Secondly filtered distilled water was used as a filter of the product. After the ITO was washed for 30 minutes, the ultrasonic cleaning was repeated twice with distilled water for 10 minutes. After the distilled water was washed, ultrasonic washing with a solvent such as isopropyl alcohol, acetone, methanol, and dried.
- a solvent such as isopropyl alcohol, acetone, methanol
- the substrate prepared as described above was subjected to ITO surface treatment for 30 seconds using a plasma mixed with oxygen and nitrogen. Thereafter, the following HAT was deposited on the ITO transparent electrode by vacuum at 100 kPa as the hole transport layer, and then NPB was deposited at 1000 kPa as the hole transport layer.
- E1 and E3 were deposited at a weight ratio of 1: 1 to the host of the light emitting layer, and the dopant D1 used was 4% by weight and the thickness of the light emitting layer was 250 mm 3.
- Alq 3 was vacuum deposited to a thickness of 300 kPa on the light emitting layer to form an electron transport layer.
- a cathode was formed by sequentially depositing 10 ⁇ thick lithium fluoride (LiF) and 1,000 ⁇ thick aluminum on the electron transport layer.
- the deposition rate of the organic material was maintained at 1 ⁇ 2 ⁇ / sec excluding the dopant.
- the lithium fluoride of the negative electrode maintained a deposition rate of 0.1 kPa / sec and aluminum of 1.5 to 2.5 kPa / sec.
- the degree of vacuum was maintained at 1 ⁇ 10 ⁇ 7 or less.
- An organic light-emitting device was manufactured in the same manner as in Example 1, except that E3 was used as a dopant for the host of the light emitting layer and D1 was vacuum deposited to a thickness of 250 Pa at a weight ratio of 4%.
- An organic light-emitting device was manufactured in the same manner as in Example 1, except that E1 was used as a dopant for the host of the light emitting layer and D1 was vacuum deposited to a thickness of 250 Pa at a weight ratio of 4%.
- An organic light-emitting device was manufactured in the same manner as in Example 1, except that in Example 1, E2 was used as a host for the light emitting layer and D1 was vacuum deposited to a thickness of 250 Pa at a weight ratio of 4%.
- An organic light-emitting device was manufactured in the same manner as in Example 1, except that E1 and E2 were deposited at a weight ratio of 1: 1 to the host of the emission layer in Example 1.
- the HOMO level was measured using an atmospheric photoelectron spectrometer (manufactured by RIKEN KEIKI Co., Ltd .: AC3).
- the LUMO energy level is measured by measuring the absorption spectrum (abs.) And the photoluminescence spectrum (PL) of the prepared sample, and calculates the spectral edge energy and sees the difference as a band gap (Eg), AC-3
- the LUMO energy level was calculated by subtracting the band gap difference from the HOMO energy level measured at.
- the organic light emitting diode manufactured by the above-described method was measured for driving voltage and luminous efficiency at a current density of 10 mA / cm 2 , and the results are shown in Table 2 below.
- the organic light emitting device having a light emitting material having a difference of at least two dipole moments of at least two includes 1.5 devices or more, while maintaining a low driving voltage and a high luminous efficiency, It can be seen that the numerical value and the numerical value of the half width are excellent in color purity and the viewing angle characteristic is improved.
- FIG. 3 is a diagram showing emission spectra of the organic light emitting diodes of Comparative Examples 1 and 3.
- FIG. 3 is a diagram showing emission spectra of the organic light emitting diodes of Comparative Examples 1 and 3.
- FIG. 5 is a diagram illustrating current densities according to voltages of organic light emitting diodes of Comparative Examples 1 and 2.
- FIG. 5 is a diagram illustrating current densities according to voltages of organic light emitting diodes of Comparative Examples 1 and 2.
- FIG. 6 is a diagram showing emission spectra of the organic light emitting diodes of Comparative Examples 1 and 2.
- FIG. 6 is a diagram showing emission spectra of the organic light emitting diodes of Comparative Examples 1 and 2.
- FIG. 7 is a diagram illustrating quantum efficiency according to currents of the organic light emitting diodes of Comparative Examples 1 and 2.
- FIG. 7 is a diagram illustrating quantum efficiency according to currents of the organic light emitting diodes of Comparative Examples 1 and 2.
- FIG. 8 is a diagram illustrating emission spectra of Comparative Example 1, Comparative Example 2, and Example 1.
- FIG. 8 is a diagram illustrating emission spectra of Comparative Example 1, Comparative Example 2, and Example 1.
- FIG. 9 is a diagram in which the emission spectra of Comparative Examples 1, 2, and 1 were normalized based on a maximum value max.
- the organic light emitting device includes two or more kinds of light emitting materials having a difference in dipole moment value of about 1.5 divisions or more in the light emitting layer, it may be confirmed that there is an improvement in color purity while maintaining a half width increase. It can be seen that this is improved.
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Abstract
Description
E1 | E2 | E3 | |
HOMO (eV) | 5.84 (cal.) | 5.85 (cal.) | 5.81 |
LUMO (eV) | 2.76 (cal.) | 2.77 (cal.) | 2.98 |
Gap (eV) | 3.08 (cal.) | 3.08 (cal.) | 2.83 |
쌍극자 모멘트(Debye) | 3.14 | 2.92 | 0.29 |
전압 (V) | 효율 (Cd/A) | 양자 효율 (Q.E) (%) | CIE(x) | CIE(y) | 반치폭 | 쌍극자 모멘트 | Δ쌍극자 모멘트 | |
비교예 1 | 3.72 | 7.65 | 8.86 | 0.133 | 0.112 | 42 | 0.29 | - |
비교예 2 | 3.53 | 9.73 | 8.9 | 0.133 | 0.154 | 45 | 3.14 | - |
비교예 3 | 3.5 | 9.0 | 9 | 0.133 | 0.140 | 45 | 2.92 | - |
비교예 4 | 3.5 | 9.5 | 8.9 | 0.133 | 0.146 | 45 | - | 0.22 |
실시예 1 | 3.55 | 8.67 | 8.88 | 0.133 | 0.132 | 47 | - | 2.85 |
Claims (21)
- 투명전극;상기 투명전극에 대향하여 구비되는 반사전극; 및상기 투명전극과 상기 반사전극 사이에 구비된 발광층을 포함하는 1층 이상의 유기물층을 포함하고,상기 발광층은 2 이상의 발광 물질을 포함하며,상기 발광 물질 중 어느 하나의 발광 물질의 쌍극자 모멘트 값과 다른 하나의 발광 물질의 쌍극자 모멘트 값의 차이가 1.5 디바이(Debye) 이상인 것인 유기 발광 소자.
- 청구항 1에 있어서,상기 발광층은 도펀트; 및 2 이상의 호스트를 포함하고,상기 2 이상의 호스트 중 어느 하나의 호스트의 쌍극자 모멘트 값과 다른 하나의 호스트의 쌍극자 모멘트 값의 차이가 1.5 디바이 이상인 것인 유기 발광 소자.
- 청구항 2에 있어서,상기 도펀트의 함량은 전체 중량 대비 0 중량% 초과 내지 30중량% 이하이고,상기 2 이상의 호스트의 함량은 전체 중량 대비 70 중량% 이상 100 중량% 미만인 것인 유기 발광 소자.
- 청구항 2에 있어서,상기 어느 하나의 호스트의 쌍극자 모멘트 값과 다른 하나의 호스트의 쌍극자 모멘트 값의 차이가 1.5 디바이 이상인 2 종의 호스트는 혼합 호스트(mixed host) 구조인 것인 유기 발광 소자.
- 청구항 4에 있어서,상기 2 종의 호스트 중 쌍극자 모멘트 값이 작은 호스트의 함량은 호스트의 전체 중량을 기준으로 10 중량% 이상 100 중량% 미만이고,상기 2 종의 호스트 중 쌍극자 모멘트 값이 큰 호스트의 함량은 호스트의 전체 중량을 기준으로 0 중량% 초과 90 중량% 이하인 것인 유기 발광 소자.
- 청구항 2에 있어서,상기 어느 하나의 호스트의 쌍극자 모멘트 값과 다른 하나의 호스트의 쌍극자 모멘트 값의 차이가 1.5 디바이 이상인 2 종의 호스트는 층상 호스트(Layer by Layer host) 구조인 것인 유기 발광 소자.
- 청구항 6에 있어서,상기 층상 호스트 구조는 제1 호스트층 및 제2 호스트층을 포함하고,상기 제1 호스트층은 상기 어느 하나의 호스트의 쌍극자 모멘트 값과 다른 하나의 호스트의 쌍극자 모멘트 값의 차이가 1.5 디바이 이상인 2 종의 호스트 중 쌍극자 모멘트 값이 더 큰 호스트를 포함하며,상기 제2 호스트층은 상기 어느 하나의 호스트의 쌍극자 모멘트 값과 다른 하나의 호스트의 쌍극자 모멘트 값의 차이가 1.5 디바이 이상인 2 종의 호스트 중 쌍극자 모멘트 값이 더 작은 호스트를 포함하고,상기 제1 호스트층은 제2 호스트층에 비하여 투명전극에 인접하여 구비되는 것인 유기 발광 소자.
- 청구항 2에 있어서,상기 2 종의 호스트 중 적어도 하나의 삼중항 에너지는상기 도펀트의 삼중항 에너지보다 큰 것인 유기 발광 소자.
- 청구항 1에 있어서,상기 발광층은 420 nm 내지 480 nm의 광발광 스펙트럼의 피크 파장을 포함하는 것인 유기 발광 소자.
- 청구항 1에 있어서,상기 발광층은 530 nm 내지 590 nm의 광발광 스펙트럼의 피크 파장을 포함하는 것인 유기 발광 소자.
- 청구항 1에 있어서,상기 유기 발광 소자의 반치폭은2 이상의 발광 물질 중 어느 하나의 발광 물질에 대한 쌍극자 모멘트 값과 다른 하나의 발광 물질에 대한 쌍극자 모멘트 값의 차이가 1.5 디바이 미만인 발광층을 포함하는 유기 발광 소자의 반치폭에 비하여 1.03 배 이상 큰 것인 유기 발광 소자.
- 청구항 1에 있어서,상기 어느 하나의 발광 물질의 쌍극자 모멘트 값과 다른 하나의 발광 물질의 쌍극자 모멘트 값의 차이가 1.5 디바이(Debye) 이상인 2종의 발광 물질 중 적어도 하나는 방향족 고리를 포함하는 것인 유기 발광 소자.
- 청구항 1에 있어서,상기 유기 발광 소자는 청색 형광 발광의 발광층을 포함하는 것인 유기 발광 소자.
- 청구항 1에 있어서,상기 유기 발광 소자는 정공주입층, 정공수송층. 전자수송층, 전자주입층, 전자저지층 및 정공저지층으로 이루어진 군에서 선택되는 1층 또는 2층 이상을 더 포함하는 것인 유기 발광 소자.
- 청구항 13에 있어서,상기 발광층은 하기 화학식 1-A로 표시되는 화합물을 포함하는 것인 유기 발광 소자:[화학식 1-A]상기 화학식 1-A에 있어서,n1은 1 이상의 정수이고,Ar7은 치환 또는 비치환된 1가 이상의 벤조플루오렌기; 치환 또는 비치환된 1가 이상의 플루오란텐기; 치환 또는 비치환된 1가 이상의 파이렌기; 또는 치환 또는 비치환된 1가 이상의 크라이센기이고,L4은 직접결합; 치환 또는 비치환된 아릴렌기; 또는 치환 또는 비치환된 헤테로아릴렌기이며,Ar8 및 Ar9는 서로 같거나 상이하고, 각각 독립적으로 치환 또는 비치환된 아릴기; 치환 또는 비치환된 실릴기; 치환 또는 비치환된 게르마늄기; 치환 또는 비치환된 알킬기; 치환 또는 비치환된 아릴알킬기; 또는 치환 또는 비치환된 헤테로아릴기이거나, 서로 결합하여 치환 또는 비치환된 고리를 형성할 수 있으며,n1이 2 이상인 경우, 2 이상의 괄호 안의 구조는 서로 같거나 상이하다.
- 청구항 15에 있어서,상기 L4은 직접결합이고, Ar7는 2 가의 파이렌기이며, Ar8 및 Ar9는 서로 같거나 상이하고 각각 독립적으로 각각 독립적으로 탄소수 1 내지 30의 알킬기로 치환 또는 비치환된 탄소수 6 내지 30의 아릴기, 또는 치환 또는 비치환된 탄소수 2 내지 30의 헤테로아릴기이고, n1은 2인 것인 유기 발광 소자.
- 청구항 13에 있어서,상기 발광층은 하기 화학식 2-A로 표시되는 화합물을 포함하는 것인 유기 발광 소자:[화학식 2-A]상기 화학식 2-A에 있어서,G11은 페닐기, 1-나프틸기, 2-나프틸기, 1-안트릴기, 2-안트릴기, 1-페난트릴기, 2-페난트릴기, 3-페난트릴기, 4-페난트릴기, 9-페난트릴기, 1-나프타센일기, 2-나프타센일기, 9-나프타센일기, 1-피렌일기, 2-피렌일기, 4-피렌일기, 3-메틸-2-나프틸기, 4-메틸-1-나프틸기, 또는 하기 화학식 이고,G12는 페닐기, 1-나프틸기, 2-나프틸기, 1-안트릴기, 2-안트릴기, 9-안트릴기, 1-페난트릴기, 2-페난트릴기, 3-페난트릴기, 4-페난트릴기, 9-페난트릴기, 1-나프타센일기, 2-나프타센일기, 9-나프타센일기, 1-피렌일기, 2-피렌일기, 4-피렌일기, 2-바이페닐릴기, 3-바이페닐릴기, 4-바이페닐릴기, p-터페닐-4-일기, p-터페닐-3-일기, p-터페닐-2-일기, m-터페닐-4-일기, m-터페닐-3-일기, m-터페닐-2-일기, o-톨릴기, m-톨릴기, p-톨릴기, p-t-뷰틸페닐기, p-(2-페닐프로필)페닐기, 3-메틸-2-나프틸기, 4-메틸-1-나프틸기, 4-메틸-1-안트릴기, 4'-메틸바이페닐릴기, 4"-t-뷰틸-p-터페닐-4-일기, 또는 3-플루오란텐일기이며,G13 및 G14는 서로 같거나 상이하고, 각각 독립적으로 수소; 치환 또는 비치환된 알킬기; 치환 또는 비치환된 알콕시기; 치환 또는 비치환된 아릴기; 또는 치환 또는 비치환된 헤테로아릴기이고,g12는 1 내지 5의 정수이며,g13 및 g14는 각각 1 내지 4의 정수이고,상기 g12 내지 g14가 각각 2 이상인 경우, 2 이상의 괄호 내의 구조는 서로 같거나 상이하다.
- 청구항 17에 있어서,상기 G11은 1-나프틸기이고, G12는 2-나프틸기인 것인 유기 발광 소자.
- 청구항 15에 있어서,상기 발광층은 하기 화학식 2-A로 표시되는 화합물을 포함하는 것인 유기 발광 소자:[화학식 2-A]상기 화학식 2-A에 있어서,G11은 페닐기, 1-나프틸기, 2-나프틸기, 1-안트릴기, 2-안트릴기, 1-페난트릴기, 2-페난트릴기, 3-페난트릴기, 4-페난트릴기, 9-페난트릴기, 1-나프타센일기, 2-나프타센일기, 9-나프타센일기, 1-피렌일기, 2-피렌일기, 4-피렌일기, 3-메틸-2-나프틸기, 4-메틸-1-나프틸기, 또는 하기 화학식 이고,G12는 페닐기, 1-나프틸기, 2-나프틸기, 1-안트릴기, 2-안트릴기, 9-안트릴기, 1-페난트릴기, 2-페난트릴기, 3-페난트릴기, 4-페난트릴기, 9-페난트릴기, 1-나프타센일기, 2-나프타센일기, 9-나프타센일기, 1-피렌일기, 2-피렌일기, 4-피렌일기, 2-바이페닐릴기, 3-바이페닐릴기, 4-바이페닐릴기, p-터페닐-4-일기, p-터페닐-3-일기, p-터페닐-2-일기, m-터페닐-4-일기, m-터페닐-3-일기, m-터페닐-2-일기, o-톨릴기, m-톨릴기, p-톨릴기, p-t-뷰틸페닐기, p-(2-페닐프로필)페닐기, 3-메틸-2-나프틸기, 4-메틸-1-나프틸기, 4-메틸-1-안트릴기, 4'-메틸바이페닐릴기, 4"-t-뷰틸-p-터페닐-4-일기, 또는 3-플루오란텐일기이며,G13 및 G14는 서로 같거나 상이하고, 각각 독립적으로 수소; 치환 또는 비치환된 알킬기; 치환 또는 비치환된 알콕시기; 치환 또는 비치환된 아릴기; 또는 치환 또는 비치환된 헤테로아릴기이고,g12는 1 내지 5의 정수이며,g13 및 g14는 각각 1 내지 4의 정수이고,상기 g12 내지 g14가 각각 2 이상인 경우, 2 이상의 괄호 내의 구조는 서로 같거나 상이하다.
- 청구항 1 내지 19 중 어느 한 항에 따른 유기 발광 소자를 포함하는 디스플레이 장치.
- 청구항 1 내지 19 중 어느 한 항에 따른 유기 발광 소자를 포함하는 조명 장치.
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US15/541,098 US10727430B2 (en) | 2015-09-25 | 2016-09-22 | Organic light emitting diode |
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CN112823434A (zh) * | 2018-10-16 | 2021-05-18 | 出光兴产株式会社 | 有机电致发光元件和电子设备 |
KR102681638B1 (ko) * | 2018-11-23 | 2024-07-04 | 엘지디스플레이 주식회사 | 표시장치 |
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CN114287069A (zh) * | 2020-06-01 | 2022-04-05 | 株式会社Lg化学 | 组合物、沉积源、包含所述组合物的有机电致发光器件及其制造方法 |
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US20170352828A1 (en) | 2017-12-07 |
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TWI634192B (zh) | 2018-09-01 |
EP3355377A4 (en) | 2019-05-29 |
JP6547831B2 (ja) | 2019-07-24 |
KR101907750B1 (ko) | 2018-10-15 |
EP3355377A1 (en) | 2018-08-01 |
CN107112430A (zh) | 2017-08-29 |
KR20170037541A (ko) | 2017-04-04 |
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TW201726890A (zh) | 2017-08-01 |
US10727430B2 (en) | 2020-07-28 |
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