US20170125699A1 - Multi-component host material and an organic electroluminescence device comprising the same - Google Patents

Multi-component host material and an organic electroluminescence device comprising the same Download PDF

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US20170125699A1
US20170125699A1 US15/301,975 US201515301975A US2017125699A1 US 20170125699 A1 US20170125699 A1 US 20170125699A1 US 201515301975 A US201515301975 A US 201515301975A US 2017125699 A1 US2017125699 A1 US 2017125699A1
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substituted
unsubstituted
arylsilyl
host
alkyl
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Hee-Choon Ahn
Young-kwang Kim
Su-Hyun Lee
Ji-Song Jun
Seon-Woo Lee
Chi-Sik Kim
Kyoung-Jin Park
Nam-Kyun Kim
Kyung-Hoon Choi
Jae-Hoon Shim
Young-jun Cho
Kyung-Joo Lee
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Rohm and Haas Electronic Materials Korea Ltd
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Rohm and Haas Electronic Materials Korea Ltd
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Definitions

  • the present invention relates to a multi-component host material and an organic electroluminescence device comprising the same.
  • An electroluminescence device is a self-light-emitting device which has advantages in that it provides a wider viewing angle, a greater contrast ratio, and a faster response time.
  • An organic EL device was first developed by Eastman Kodak, by using small aromatic diamine molecules, and aluminum complexes as materials for forming a light-emitting layer [Appl. Phys. Lett. 51, 913, 1987].
  • An organic EL device is a device changing electronic energy to light by applying electricity to an organic electroluminescent material, and generally has a structure comprising an anode, a cathode, and an organic layer between the anode and the cathode.
  • the organic layer of an organic EL device may be comprised of a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer (which comprises host and dopant materials), an electron buffer layer, a hole blocking layer, an electron transport layer, an electron injection layer, etc., and the materials used for the organic layer are categorized by their functions in hole injection material, hole transport material, electron blocking material, light-emitting material, electron buffer material, hole blocking material, electron transport material, electron injection material, etc.
  • the organic EL device due to an application of a voltage, holes are injected from the anode to the light-emitting layer, electrons are injected from the cathode to the light-emitting layer, and excitons of high energies are formed by a recombination of the holes and the electrons.
  • excitons of high energies are formed by a recombination of the holes and the electrons.
  • luminescent organic compounds reach an excited state, and light emission occurs by emitting light from energy due to the excited state of the luminescent organic compounds returning to a ground state.
  • a light-emitting material must have high quantum efficiency, high electron and hole mobility, and the formed light-emitting material layer must be uniform and stable.
  • Light-emitting materials are categorized into blue, green, and red light-emitting materials dependent on the color of the light emission, additionally yellow or orange light-emitting materials.
  • Light-emitting materials can also be categorized into host and dopant materials according to their functions.
  • the host material which acts as a solvent in a solid state and transfers energy needs to have high purity and a molecular weight appropriate for vacuum deposition. Furthermore, the host material needs to have high glass transition temperature and high thermal degradation temperature to achieve thermal stability, high electro-chemical stability to achieve long lifespan, ease of forming amorphous thin film, good adhesion to materials of adjacent layers, and non-migration to other layers.
  • a light-emitting material can be used as a combination of a host and a dopant to improve color purity, luminous efficiency, and stability.
  • an EL device having excellent characteristics has a structure comprising a light-emitting layer formed by doping a dopant to a host. Since host materials greatly influence the efficiency and lifespan of the EL device when using a dopant/host material system as a light emitting material, their selection is important.
  • the objective of the present invention is to provide an organic electroluminescent device having high efficiency and long lifespan.
  • an organic electroluminescent device comprising at least one light-emitting layer between an anode and a cathode, wherein the light-emitting layer comprises a host and a phosphorescent dopant, the host consists of multi-component host compounds, at least a first host compound of the multi-component host compounds is represented by the following formula 1, and a second host compound is represented by the following formula 2:
  • a 1 and A 2 each independently represent a substituted or unsubstituted (C6-C30)aryl
  • L 1 represents a substituted or unsubstituted (C6-C30)arylene
  • X 1 to X 16 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substitute
  • Ma represents a substituted or unsubstituted nitrogen-containing (5- to 11-membered)heteroaryl
  • La represents a single bond, or a substituted or unsubstituted (C6-C30)arylene
  • Xa to Xh each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, or a
  • an organic electroluminescent device having high efficiency and long lifespan is provided, and it is possible to manufacture a display device or a lighting device using the organic electroluminescent device.
  • organic electroluminescent device comprising the organic electroluminescent compounds of formulae 1 and 2 will be described in detail.
  • the compound represented by formula 1 can be represented by formula 3, 4, 5, or 6:
  • a 1 , A 2 , L 1 , and X 1 to X 16 are as defined in formula 1.
  • a 1 and A 2 each independently represent a substituted or unsubstituted (C6-C30)aryl, preferably, each independently represent a substituted or unsubstituted (C6-C18)aryl, more preferably, each independently represent a (C6-C18)aryl unsubstituted or substituted with a cyano, a (C1-C6)alkyl, a (C6-C12)aryl, or a tri(C6-C12)arylsilyl, and even more preferably, each independently represent phenyl, biphenyl, terphenyl, naphthyl, fluorenyl, phenanthrenyl, anthracenyl, indenyl, triphenylenyl, pyrenyl, tetracenyl, perylenyl, chrysenyl, or fluoranthenyl.
  • X 1 to X 16 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substitute
  • L 1 represents a substituted or unsubstituted (C6-C30)arylene, preferably, represents a substituted or unsubstituted (C6-C15)arylene, and more preferably, represents a (C6-C15)arylene unsubstituted or substituted with a cyano, a (C1-C6)alkyl, or a tri(C6-C12)arylsilyl.
  • L 1 can be represented by one of formulae 7 to 19:
  • Xi to Xp each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substitute
  • Xi to Xp may each independently represent hydrogen, a halogen, a cyano, a (C1-C10)alkyl, a (C3-C20)cycloalkyl, a (C6-C12)aryl, a (C1-C6)alkyldi(C6-C12)arylsilyl, or a tri(C6-C12)arylsilyl, and more preferably, each independently represent hydrogen, a cyano, a (C1-C6)alkyl, or a tri(C6-C12)arylsilyl.
  • Ma represents a substituted or unsubstituted nitrogen-containing (5- to 11-membered)heteroaryl, preferably, represents a substituted or unsubstituted nitrogen-containing (6- to 10-membered)heteroaryl, and more preferably, represents a nitrogen-containing (6- to 10-membered)heteroaryl substituted with an unsubstituted (C6-C18)aryl, a (C6-C12)aryl substituted with a cyano, a (C6-C12)aryl substituted with a (C1-C6)alkyl, a (C6-C12)aryl substituted with a tri(C6-C12)arylsilyl, or a (6- to 15-membered)heteroaryl.
  • Ma may represent a monocyclic heteroaryl selected from the group consisting of pyrrolyl, imidazolyl, pyrazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, pyridyl, pyrazinyl, pyrimidinyl, and pyridazinyl, or a fused heteroaryl selected from the group consisting of benzoimidazolyl, isoindolyl, indolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, quinazolinyl, naphthyridinyl, and quinoxalinyl, and preferably may represent triazinyl, pyrimidinyl, pyridyl, quinolyl, isoquinolyl, quinazolinyl, naphthyridinyl, or quinoxalinyl.
  • La represents a single bond, or a substituted or unsubstituted (C6-C30)arylene, preferably, represents a single bond, or a substituted or unsubstituted (C6-C12)arylene, and more preferably, represents a single bond, or a (C6-C12)arylene unsubstituted or substituted with a tri(C6-C10)arylsilyl.
  • La can represent a single bond, or be represented by one of formulae 7 to 19 as above.
  • Xa to Xh each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substitute
  • (C1-C30)alkyl is meant to be a linear or branched alkyl having 1 to 30 carbon atoms, in which the number of carbon atoms is preferably 1 to 20, more preferably 1 to 10, and includes methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, etc.;
  • (C2-C30)alkenyl is meant to be a linear or branched alkenyl having 2 to 30 carbon atoms, in which the number of carbon atoms is preferably 2 to 20, more preferably 2 to 10, and includes vinyl, 1-propenyl, 2-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-methylbut-2-enyl, etc.
  • (C2-C30)alkynyl is meant to be a linear or branched alkynyl having 2 to 30 carbon atoms, in which the number of carbon atoms is preferably
  • substituted in the expression “substituted or unsubstituted” means that a hydrogen atom in a certain functional group is replaced with another atom or group, i.e. a substituent.
  • a triarylsilyl as X 1 to X 16 is preferably a triphenylsilyl.
  • the first host compound represented by formula 1 includes the following compounds, but is not limited thereto:
  • the second host compound represented by formula 2 includes the following compounds, but is not limited thereto:
  • the organic electroluminescent device comprises an anode; a cathode; and at least one organic layer between the anode and the cathode.
  • the organic layer comprises a light-emitting layer, and the light-emitting layer comprises a host and a phosphorescent dopant.
  • the host consists of multi-component host compounds, at least a first host compound of the multi-component host compounds is represented by formula 1, and a second host compound is represented by formula 2.
  • the light-emitting layer is a layer from which light is emitted, and can be a single layer or a multi layer of which two or more layers are stacked. In the light-emitting layer, it is preferable that the doping concentration of the dopant compound based on the host compound is less than 20 wt %.
  • the organic layer comprises a light-emitting layer, and may further comprise at least one layer selected from the group consisting of a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, an interlayer, a hole blocking layer, and an electron blocking layer.
  • the weight ratio of the first host material to the second host material is in the range of 1:99 to 99:1.
  • the dopant is preferably at least one phosphorescent dopant.
  • the dopant materials applied to the organic electroluminescent device according to the present invention are not limited, but may be preferably selected from metallated complex compounds of iridium, osmium, copper and platinum, more preferably selected from ortho-metallated complex compounds of iridium, osmium, copper and platinum, and even more preferably ortho-metallated iridium complex compounds.
  • the phosphorescent dopant is preferably selected from compounds represented by the following formulae 101 to 103.
  • L is selected from the following structures:
  • R 100 represents hydrogen, a substituted or unsubstituted (C1-C30)alkyl, or a substituted or unsubstituted (C3-C30)cycloalkyl;
  • R 101 to R 109 , and R 111 to R 123 each independently represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium or a halogen(s), a cyano, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; adjacent substituents of R 106 to R 109 may be linked to each other to form a substituted or unsubstituted fused ring, e.g., fluorene unsubstituted or substituted with alkyl, dibenzothiophene unsubstituted or substituted with alkyl, or dibenzofuran unsubstituted or substituted with alkyl; and adjacent substituents of R 120 to R 123 may be
  • R 124 to R 127 each independently represent hydrogen, deuterium, a halogen, a substituted or unsubstituted (C1-C30)alkyl, or a substituted or unsubstituted (C6-C30)aryl; and adjacent substituents of R 124 to R 127 may be linked to each other to form a substituted or unsubstituted fused ring, e.g., fluorene unsubstituted or substituted with alkyl, dibenzothiophene unsubstituted or substituted with alkyl, or dibenzofuran unsubstituted or substituted with alkyl;
  • R 201 to R 211 each independently represent hydrogen, deuterium, a halogen, a (C1-C30)alkyl unsubstituted or substituted with deuterium or a halogen(s), a substituted or unsubstituted (C3-C30)cycloalkyl, or a substituted or unsubstituted (C6-C30)aryl; and adjacent substituents of R 205 to R 211 may be linked to each other to form a substituted or unsubstituted fused ring, e.g., fluorene unsubstituted or substituted with alkyl, dibenzothiophene unsubstituted or substituted with alkyl, or dibenzofuran unsubstituted or substituted with alkyl;
  • r and s each independently represent an integer of 1 to 3; where r or s is an integer of 2 or more, each of R 100 may be the same or different; and
  • e represents an integer of 1 to 3.
  • the phosphorescent dopant materials include the following:
  • the organic electroluminescent device according to the present invention may further comprise at least one compound selected from the group consisting of arylamine-based compounds and styrylarylamine-based compounds in the organic layer.
  • the organic layer may further comprise at least one metal selected from the group consisting of metals of Group 1, metals of Group 2, transition metals of the 4 th period, transition metals of the 5 th period, lanthanides and organic metals of d-transition elements of the Periodic Table, or at least one complex compound comprising said metal.
  • At least one layer is preferably placed on an inner surface(s) of one or both electrode(s); selected from a chalcogenide layer, a metal halide layer and a metal oxide layer.
  • a chalcogenide (including oxides) layer of silicon or aluminum is preferably placed on an anode surface of an electroluminescent medium layer
  • a metal halide layer or a metal oxide layer is preferably placed on a cathode surface of an electroluminescent medium layer.
  • Such a surface layer provides operation stability for the organic electroluminescent device.
  • said chalcogenide includes SiO x (1 ⁇ X ⁇ 2), AlO x (1 ⁇ X ⁇ 1.5), SiON, SiAlON, etc.; said metal halide includes LiF, MgF 2 , CaF 2 , a rare earth metal fluoride, etc.; and said metal oxide includes Cs 2 O, Li 2 O, MgO, SrO, BaO, CaO, etc.
  • a layer selected from a hole injection layer, a hole transport layer, or an electron blocking layer, or formed by a combination thereof can be used.
  • Multi layers can be used for the hole injection layer in order to lower the hole injection barrier (or hole injection voltage) from the anode to the hole transport layer or the electron blocking layer. Two compounds can be simultaneously used in each layer.
  • the hole transport layer and the electron blocking layer can also be formed of multi layers.
  • a layer selected from an electron buffer layer, a hole blocking layer, an electron transport layer, or an electron injection layer, or formed by a combination thereof can be used.
  • Multi layers can be used for the electron buffer layer in order to control the injection of the electrons and enhance the interfacial characteristics between the light-emitting layer and the electron injection layer.
  • Two compounds can be simultaneously used in each layer.
  • the hole blocking layer and the electron transport layer can also be formed of multi layers, and each layer can comprise two or more compounds.
  • a mixed region of an electron transport compound and a reductive dopant, or a mixed region of a hole transport compound and an oxidative dopant is preferably placed on at least one surface of a pair of electrodes.
  • the electron transport compound is reduced to an anion, and thus it becomes easier to inject and transport electrons from the mixed region to an electroluminescent medium.
  • the hole transport compound is oxidized to a cation, and thus it becomes easier to inject and transport holes from the mixed region to the electroluminescent medium.
  • the oxidative dopant includes various Lewis acids and acceptor compounds; and the reductive dopant includes alkali metals, alkali metal compounds, alkaline earth metals, rare-earth metals, and mixtures thereof.
  • a reductive dopant layer may be employed as a charge generating layer to prepare an electroluminescent device having two or more electroluminescent layers and emitting white light.
  • each layer of the organic electroluminescent device of the present invention dry film-forming methods such as vacuum evaporation, sputtering, plasma and ion plating methods, or wet film-forming methods such as ink jet printing, nozzle printing, slot coating, spin coating, dip coating, and flow coating methods can be used.
  • the first and second host compounds of the present invention may be co-evaporated or mixture-evaporated.
  • a thin film can be formed by dissolving or diffusing materials forming each layer into any suitable solvent such as ethanol, chloroform, tetrahydrofuran, dioxane, etc.
  • the solvent can be any solvent where the materials forming each layer can be dissolved or diffused, and where there are no problems in film-formation capability.
  • a co-evaporation indicates a process for two or more materials to be deposited as a mixture, by introducing each of the two or more materials into respective crucible cells, and applying an electric current to the cells for each of the materials to be evaporated.
  • a mixture-evaporation indicates a process for two or more materials to be deposited as a mixture, by mixing the two or more materials in one crucible cell before the deposition, and applying an electric current to the cell for the mixture to be evaporated.
  • a display system or a lighting system can be produced.
  • An OLED device was produced using the organic electroluminescent compound according to the present invention.
  • a transparent electrode indium tin oxide (ITO) thin film (10 ⁇ /sq) on a glass substrate for an organic light-emitting diode (OLED) device (Geomatec) was subjected to an ultrasonic washing with trichloroethylene, acetone, ethanol, and distilled water, sequentially, and then was stored in isopropanol.
  • the ITO substrate was then mounted on a substrate holder of a vacuum vapor depositing apparatus.
  • N 4 ,N 4′ -diphenyl-N 4 ,N 4′ -bis(9-phenyl-9H-carbazol-3-yl)-[1,1′-biphenyl]-4,4′-diamine (compound HI-1) was introduced into a cell of said vacuum vapor depositing apparatus, and then the pressure in the chamber of said apparatus was controlled to 10 ⁇ 6 torr. Thereafter, an electric current was applied to the cell to evaporate the above introduced material, thereby forming a first hole injection layer having a thickness of 80 nm on the ITO substrate.
  • 1,4,5,8,9,12-hexaazatriphenylene-hexacarbonitrile (compound HI-2) was introduced into another cell of said vacuum vapor depositing apparatus, and was evaporated by applying an electric current to the cell, thereby forming a second hole injection layer having a thickness of 5 nm on the first hole injection layer.
  • N-([1,1′-biphenyl]-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine (compound HT-1) was then introduced into another cell of said vacuum vapor depositing apparatus, and was evaporated by applying an electric current to the cell, thereby forming a first hole transport layer having a thickness of 10 nm on the second hole injection layer.
  • N,N-di([1,1′-biphenyl]-4-yl)-4′-(9H-carbazol-9-yl)-[1,1′-biphenyl]-4-amine (compound HT-2) was introduced into another cell of said vacuum vapor depositing apparatus, and was evaporated by applying an electric current to the cell, thereby forming a second hole transport layer having a thickness of 60 nm on the first hole transport layer.
  • a first host compound and a second host compound were introduced into two cells of the vacuum vapor depositing apparatus, respectively.
  • a dopant compound D-96 was introduced into another cell.
  • the two host materials were evaporated at 1:1 rate, while the dopant was evaporated at a different rate from the host materials, so that the dopant was deposited in a doping amount of 3 wt % based on the total amount of the host and dopant to form a light-emitting layer having a thickness of 40 nm on the hole transport layer.
  • An OLED device was produced in the same manner as in Device Examples 1-1 to 1-6, except for using only the second host compound as a host of the light-emitting layer.
  • the driving voltage at 1,000 nit, luminous efficiency, CIE color coordinate, and the time taken for the luminance at 5,000 nit to be reduced from 100% to 80% at a constant current of the OLEDs produced as above were measured.
  • Table 1 below shows the luminous characteristics of the organic electroluminescent devices produced as in the examples above.
  • An OLED device was produced in the same manner as in Device Examples 1-1 to 1-6, except for forming the second hole injection layer of 3 nm; forming the first hole transport layer of 40 nm; not forming the second hole transport layer; doping compound D-25 as the dopant of the light-emitting layer in a doping amount of 15 wt % based on the total amount of the host and dopant; forming the electron transport layer of 35 nm by evaporating 2,4-bis(9,9-dimethyl-9H-fluoren-2-yl)-6-(naphthalen-2-yl)-1,3,5-triazine and lithium quinolate at a rate of 4:6; and using other combinations for the first host compound and the second host compound used in the host of the light-emitting layer.
  • An OLED device was produced in the same manner as in Device Examples 1-1 to 1-6, except for forming the second hole injection layer of 3 nm; forming the first hole transport layer of 40 nm; not forming the second hole transport layer; doping compound D-1 as the dopant of the light-emitting layer in a doping amount of 15 wt % based on the total amount of the host and dopant; forming the electron transport layer of 35 nm by evaporating 2,4-bis(9,9-dimethyl-9H-fluoren-2-yl)-6-(naphthalen-2-yl)-1,3,5-triazine and lithium quinolate at a rate of 4:6; and using other combinations for the first host compound and the second host compound used in the host of the light-emitting layer.
  • An OLED device was produced in the same manner as in Device Examples 1-1 to 1-6, except for forming the second hole injection layer of 3 nm; forming the first hole transport layer of 40 nm; not forming the second hole transport layer; doping compound D-136 as the dopant of the light-emitting layer in a doping amount of 15 wt % based on the total amount of the host and dopant; forming the electron transport layer of 35 nm by evaporating 2,4-bis(9,9-dimethyl-9H-fluoren-2-yl)-6-(naphthalen-2-yl)-1,3,5-triazine and lithium quinolate at a rate of 4:6; and using other combinations for the first host compound and the second host compound used in the host of the light-emitting layer.
  • An OLED device was produced in the same manner as in Device Examples 2-1 to 2-7, except for forming the first hole injection layer of 10 nm; forming the second hole transport layer of 30 nm using compound HT-3; using compound D-136 as the dopant of the light-emitting layer; and using other combinations for the first host compound and the second host compound used in the host of the light-emitting layer.
  • An OLED device was produced in the same manner as in Device Examples 2-1 to 2-7, except for forming the first hole injection layer of 10 nm; forming the second hole transport layer of 30 nm using compound HT-3; using compound D-168 as the dopant of the light-emitting layer; and using other combinations for the first host compound and the second host compound used in the host of the light-emitting layer.
  • An OLED device was produced in the same manner as in Device Examples 2-1 to 2-7, except for using only the first host compound as a host of the light-emitting layer.
  • An OLED device was produced in the same manner as in Device Examples 2-1 to 2-7, except for using only the second host compound as a host of the light-emitting layer.
  • An OLED device was produced in the same manner as in Device Examples 2-8 to 2-9, except for using only the second host compound as a host of the light-emitting layer.
  • An OLED device was produced in the same manner as in Device Examples 3-1 to 3-3, except for using only the second host compound as a host of the light-emitting layer.
  • the driving voltage at 1,000 nit, luminous efficiency, CIE color coordinate, and the time taken for the luminance at 15,000 nit to be reduced from 100% to 80% at a constant current of the OLEDs produced as above were measured.
  • Table 2 below shows the luminous characteristics of the organic electroluminescent devices produced as in the examples above.
  • An OLED device was produced in the same manner as in Device Examples 1-1 to 1-6, except for using compound HT-4 for the second hole transport layer, and using the compounds as listed in Table 3 below for the first host compound and the second host compound used in the host of the light-emitting layer.
  • An OLED device was produced in the same manner as in Device Example 4-1, except for using only the second host compound of Table 3 as a host of the light-emitting layer.
  • the driving voltage at 1,000 nit, luminous efficiency, CIE color coordinate, and the time taken for the luminance at 5,000 nit to be reduced from 100% to 90% at a constant current of the OLEDs produced as above were measured.
  • Table 3 below shows the luminous characteristics of the organic electroluminescent devices produced as in the examples above.
  • the organic electroluminescent device of the present invention comprises a light-emitting layer comprising a host and a phosphorus dopant, and the host consists of a specific combination of multi-component host compounds.
  • the device of the present invention provides superior lifespan characteristics to conventional devices.

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US20220216430A1 (en) 2022-07-07
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CN114551746A (zh) 2022-05-27
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WO2015160224A1 (fr) 2015-10-22
US20220216429A1 (en) 2022-07-07

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