WO2016105050A1 - 유기 전계 발광 소자 - Google Patents
유기 전계 발광 소자 Download PDFInfo
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- WO2016105050A1 WO2016105050A1 PCT/KR2015/014021 KR2015014021W WO2016105050A1 WO 2016105050 A1 WO2016105050 A1 WO 2016105050A1 KR 2015014021 W KR2015014021 W KR 2015014021W WO 2016105050 A1 WO2016105050 A1 WO 2016105050A1
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- 0 **1c2ccccc2-c2ccccc12 Chemical compound **1c2ccccc2-c2ccccc12 0.000 description 2
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
Definitions
- the present invention relates to an organic electroluminescent device comprising an organic material layer.
- the organic electroluminescent device when current or voltage is applied to two electrodes, holes are injected into the organic material layer at the anode, and electrons are injected into the organic material layer at the cathode. When the injected holes and electrons meet, an exciton is formed, and the exciton falls to the ground and shines.
- the organic EL device may be classified into a fluorescent EL device in which singlet excitons contribute to light emission and a phosphorescent EL device in which triplet excitons contribute to light emission according to the electron spin type of the formed exciton.
- the electron spin of excitons formed by the recombination of electrons and holes, produces 25% and 75% of singlet excitons and triplet excitons.
- the internal quantum efficiency can theoretically not exceed 25% according to the production rate, and the external quantum efficiency is accepted as a limit of 5%.
- the phosphorescent electroluminescent device in which light emission is performed by triplet excitons can improve luminous efficiency up to four times as compared to fluorescent electroluminescent devices.
- the phosphorescent electroluminescent device exhibits higher efficiency than the fluorescent electroluminescent device in terms of luminous efficiency based on the theoretical fact, but the development of a host satisfying the deep blue color purity and high efficiency is insufficient in the blue phosphorescent electroluminescent device.
- blue fluorescent electroluminescent devices are mainly used in products rather than blue phosphorescent electroluminescent devices.
- an object of the present invention is to provide an organic electroluminescent device excellent in driving voltage, luminous efficiency and lifetime.
- the present invention is an anode; cathode; And an organic material layer interposed between the anode and the cathode, wherein the organic material layer includes a compound represented by Formula 1 below.
- R a and R b are the same as or different from each other, and are each independently selected from the group consisting of an alkyl group of C 1 to C 40 and an aryl group of C 6 to C 60 , or combine with each other to form a condensed ring,
- R 1 to R 3 are the same or different, each independently represent hydrogen, deuterium, halogen group, cyano group, nitro group, amino group, C 1 ⁇ alkenyl group of the C 40 alkyl group, C 2 ⁇ C 40 of, C 2 ⁇ C 40 alkynyl group, C 3 to C 40 cycloalkyl group, nuclear atom 3 to 40 heterocycloalkyl group, C 6 to C 60 aryl group, nuclear atom 5 to 60 heteroaryl group, C 1 to C 40 alkyloxy group, C 6 ⁇ C 60 aryloxy group, C 1 ⁇ C 40 alkylsilyl group, C 6 ⁇ C 60 arylsilyl group, C 1 ⁇ C 40 alkyl boron group, C 6 ⁇ C group of 60 arylboronic, C 1 ⁇ C 40 of a phosphine group, and groups bonded C 1 ⁇ C 40 phosphine oxide group, and a C 6 ⁇ , or selected from the group consisting of an
- L is a single bond or is selected from the group consisting of a C 6 ⁇ C 18 arylene group and a heteroarylene group having 5 to 18 nuclear atoms,
- Z 1 to Z 5 are the same or different, and are each independently N or C (R 4), wherein each at least one is N, wherein the C (R 4) with a plurality of C (R 4) If the plurality Same or different,
- c and e are each an integer of 0 to 4,
- d is an integer of 0 to 3
- n are each an integer of 1 to 3
- R 4 is hydrogen, deuterium, halogen group, cyano group, nitro group, amino group, C 1 ⁇ C 40 alkyl group, C 2 ⁇ C 40 alkenyl group, C 2 ⁇ C 40 alkynyl group, C 3 ⁇ C 40 Of cycloalkyl group, heterocycloalkyl group of 3 to 40 nuclear atoms, aryl group of C 6 to C 60 , heteroaryl group of 5 to 60 nuclear atoms, alkyloxy group of C 1 to C 40 , C 6 to C 60 Aryloxy group, C 1 ⁇ C 40 alkylsilyl group, C 6 ⁇ C 60 arylsilyl group, C 1 ⁇ C 40 alkyl boron group, C 6 ⁇ C 60 aryl boron group, C 1 ⁇ C 40 A phosphine group, a C 1 to C 40 phosphine oxide group and a C 6 to C 60 arylamine group, or combine with an adjacent group to form a condensed ring
- Alkyl group and aryl group of R a and R b Alkyl group, alkynyl group, cycloalkyl group, heterocycloalkyl group, aryl group, heteroaryl group, alkyloxy group, aryloxy group, alkyl of R 1 to R 4
- the silyl group, arylsilyl group, alkyl boron group, aryl boron group, phosphine group, phosphine oxide group, arylamine group, the arylene group, heteroarylene group of L are each independently deuterium, halogen group, cyano group, nitro group , Amino group, C 1 to C 40 alkyl group, C 2 to C 40 alkenyl group, C 2 to C 40 alkynyl group, C 3 to C 40 cycloalkyl group, nuclear atom 3 to 40 heterocycloalkyl group, C Aryl group of 6 to C 60 , heteroaryl group of 5 to 60 nuclear atoms, alky
- the compound represented by Formula 1 may be included in the life improvement layer of the organic material layer.
- the present invention can provide an organic EL device having excellent driving voltage, luminous efficiency, and lifespan by introducing a lifetime improving layer, an electron transporting layer, or an electron injection layer formed of a compound having specific physical properties into the organic EL device.
- the organic electroluminescent device of the present invention is applied to a display panel, a display panel having improved performance and lifespan can be provided.
- FIG. 1 is a cross-sectional view illustrating an organic EL device according to an embodiment of the present invention.
- One example of the present invention is an anode; cathode; And an organic material layer interposed between the anode and the cathode, wherein the organic material layer includes a compound represented by Formula 1 below.
- R a and R b are the same as or different from each other, and are each independently selected from the group consisting of an alkyl group of C 1 to C 40 and an aryl group of C 6 to C 60 , or combine with each other to form a condensed ring,
- R 1 to R 3 are the same or different, each independently represent hydrogen, deuterium, halogen group, cyano group, nitro group, amino group, C 1 ⁇ alkenyl group of the C 40 alkyl group, C 2 ⁇ C 40 of, C 2 ⁇ C 40 alkynyl group, C 3 to C 40 cycloalkyl group, nuclear atom 3 to 40 heterocycloalkyl group, C 6 to C 60 aryl group, nuclear atom 5 to 60 heteroaryl group, C 1 to C 40 alkyloxy group, C 6 ⁇ C 60 aryloxy group, C 1 ⁇ C 40 alkylsilyl group, C 6 ⁇ C 60 arylsilyl group, C 1 ⁇ C 40 alkyl boron group, C 6 ⁇ C group of 60 arylboronic, C 1 ⁇ C 40 of the phosphine group, C 1 ⁇ C 40 phosphine oxide group, and a C 6 ⁇ selected from the group consisting of an aryl amine of the
- L is a single bond or is selected from the group consisting of a C 6 ⁇ C 18 arylene group and a heteroarylene group having 5 to 18 nuclear atoms,
- Z 1 to Z 5 are the same or different, and are each independently N or C (R 4), wherein each at least one is N, wherein the C (R 4) with a plurality of C (R 4) If the plurality Same or different,
- c and e are each an integer of 0 to 4,
- d is an integer of 0 to 3
- n are each an integer of 1 to 3
- R 4 is hydrogen, deuterium, halogen group, cyano group, nitro group, amino group, C 1 ⁇ C 40 alkyl group, C 2 ⁇ C 40 alkenyl group, C 2 ⁇ C 40 alkynyl group, C 3 ⁇ C 40 Of cycloalkyl group, heterocycloalkyl group of 3 to 40 nuclear atoms, aryl group of C 6 to C 60 , heteroaryl group of 5 to 60 nuclear atoms, alkyloxy group of C 1 to C 40 , C 6 to C 60 Aryloxy group, C 1 ⁇ C 40 alkylsilyl group, C 6 ⁇ C 60 arylsilyl group, C 1 ⁇ C 40 alkyl boron group, C 6 ⁇ C 60 aryl boron group, C 1 ⁇ C 40 A phosphine group, a C 1 to C 40 phosphine oxide group and a C 6 to C 60 arylamine group, or combine with an adjacent group (specifically, adjacent R 4 bonds)
- Alkyl group and aryl group of R a and R b Alkyl group, alkynyl group, cycloalkyl group, heterocycloalkyl group, aryl group, heteroaryl group, alkyloxy group, aryloxy group, alkyl of R 1 to R 4
- the silyl group, arylsilyl group, alkyl boron group, aryl boron group, phosphine group, phosphine oxide group, arylamine group, the arylene group, heteroarylene group of L are each independently deuterium, halogen group, cyano group, nitro group , Amino group, C 1 to C 40 alkyl group, C 2 to C 40 alkenyl group, C 2 to C 40 alkynyl group, C 3 to C 40 cycloalkyl group, nuclear atom 3 to 40 heterocycloalkyl group, C Aryl group of 6 to C 60 , heteroaryl group of 5 to 60 nuclear atoms, alky
- the organic electroluminescent device is an anode (100); Cathode 200; And an organic material layer 300 interposed between the anode and the cathode.
- the anode 100 injects holes into the organic material layer 300.
- the material constituting the anode 100 is not particularly limited, and examples thereof include metals such as vanadium, chromium, copper, zinc, and gold; Alloys thereof; Metal oxides such as zinc oxide, indium oxide, indium tin oxide (ITO) and indium zinc oxide (IZO); Combinations of metals and oxides such as ZnO and Al, SnO 2 and Sb; Conductive polymers such as polythiophene, poly (3-methylthiophene), poly [3,4- (ethylene-1,2-dioxy) thiophene] (PEDT), polypyrrole and polyaniline; And carbon black.
- the method for manufacturing the anode 100 is not particularly limited, and non-limiting examples include a method of coating the anode material on a substrate made of a silicon wafer, quartz, glass plate, metal plate, or plastic film.
- the cathode 200 injects electrons into the organic material layer 300.
- the material constituting the cathode 200 is not particularly limited, and examples thereof include metals such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin, and lead; Alloys thereof; And multilayer structure materials such as LiF / Al and LiO 2 / Al.
- the method for manufacturing the cathode 200 is not particularly limited as long as it is known in the art.
- the organic layer 300 is preferably a hole injection layer 301, a hole transport layer 302, a light emitting layer 303, a life improvement layer 304, an electron transport layer 305 and an electron injection layer ( 306) one or more selected from the group consisting of.
- the organic material layer 300 more preferably includes all of the above layers.
- the hole injection layer 301 and the hole transport layer 302 serve to move the holes injected from the anode 100 to the light emitting layer 303.
- the material constituting the hole injection layer 301 and the hole transport layer 302 is not particularly limited as long as the material has a low hole injection barrier and a high hole mobility, and examples thereof include an arylamine derivative.
- the emission layer 303 is a layer in which holes and electrons meet to form excitons.
- the color of light emitted from the organic EL device may vary depending on the material of the emission layer 303.
- the light emitting layer 303 may include a host and a dopant.
- the light emitting layer 303 may include 70 to 99.9 wt% of the host and 0.1 to 30 wt% of the dopant.
- the light emitting layer 303 is blue fluorescence, green fluorescence, or red fluorescence, it is preferable to include 70 to 99.9 wt% of the host and 0.1 to 30 wt% of the dopant, and include 80 to 99 wt% of the host. More preferably, 1 to 20% by weight of the dopant is included.
- the host included in the light emitting layer 303 is not particularly limited as long as it is known in the art, non-limiting examples, alkali metal complex; Alkaline earth metal complexes; Or condensed aromatic ring derivatives.
- alkali metal complex Alkaline earth metal complexes
- condensed aromatic ring derivatives aluminum complexes, beryllium complexes, anthracene derivatives, pyrene derivatives, triphenylene derivatives, carbazole derivatives, dibenzofuran derivatives, dibenzothiophene derivatives which can improve the luminous efficiency and lifetime of organic electroluminescent devices Preference is given to using.
- the dopant included in the emission layer 303 is not particularly limited as long as it is known in the art, and includes, but is not limited to, an anthracene derivative, a pyrene derivative, an arylamine derivative, iridium (Ir) or platinum (Pt). Complex compounds may be mentioned.
- the light emitting layer 303 may be formed of one layer (single layer) or may be formed of a plurality of layers (multilayer).
- the organic EL device may emit light of various colors.
- a plurality of light emitting layers may be provided between the hole transport layer 302 and the life improvement layer 304 to provide an organic EL device having a mixed color.
- the light emitting layer may be made of different materials.
- the driving voltage increases, but the current value in the organic EL device is constant, thereby providing an organic EL device having improved light emission efficiency by the number of light emitting layers.
- the life improvement layer 304 is to improve the life of the organic EL device and is provided between the light emitting layer 303 and the electron transport layer 305.
- the material constituting the life improvement layer 304 is not particularly limited, and is preferably a compound that exhibits bipolar having both electron attraction (EWG) and electron donor (EDG) with high electron donating properties. Do.
- the material forming the life improvement layer 304 is more preferably a compound represented by Chemical Formula 1.
- the bipolar compound preferably has an ionization potential of 5.5 eV or more, more preferably 5.5 to 7.0 eV, and most preferably 5.6 to 6.6 eV.
- the bipolar compound preferably has a difference between the HOMO value and the LUMO value (E HOMO -E LUMO ) of more than 3.0 eV, more preferably 2.8 to 3.8 eV.
- the bipolar compound preferably has a triplet energy of 2.3 eV or more, more preferably 2.3 to 3.5 eV, and most preferably 2.3 to 3.0 eV.
- the bipolar compound preferably has a singlet energy and triplet energy difference of less than 0.7 eV, and more preferably 0.01 to 0.7 eV.
- a compound having an ionization potential of 5.5 eV or more is used for the life improvement layer 304, holes can be prevented from diffusing or moving to the electron transport layer 305, thereby improving the life of the organic EL device.
- holes move in the organic electroluminescent device according to the ionization potential level.
- an irreversible decomposition reaction by oxidation occurs to cause organic electroluminescence.
- the lifetime of the device is reduced.
- the life improvement layer 304 made of a bipolar compound having an ionization potential of 5.5 eV or more is prevented from diffusing or moving holes to the electron transport layer 305, the life of the organic EL device may be improved. Can be. That is, the holes are blocked by the high energy barrier of the life improvement layer 304, and thus do not diffuse or move to the electron transport layer 305, but remain in the light emitting layer 303.
- the ionization potential of the bipolar compound included in the life improvement layer 304 may be 5.5 eV or more.
- the bipolar compound is ionized. It is preferable that potential is 6.0 eV or more.
- the bipolar compound is the difference between the HOMO value and LUMO value (E HOMO -E LUMO ) is more than 3.0eV, triplet energy is 2.3eV or more, singlet energy and triplet energy difference is preferably less than 0.7eV.
- E HOMO -E LUMO the exciton formed in the light emitting layer 303 can be prevented from diffusing into the electron transporting layer 305, and light emission is generated at the interface between the light emitting layer 303 and the electron transporting layer 305. This is because it can also prevent the phenomenon that occurs. As a result, it is possible to prevent spectral mixing of the organic EL device and to improve stability, thereby improving the life of the organic EL device.
- the bipolar compound has both electron attracting electrons (EWG) and electron donors (EDG), which have high electron donating characteristics, so that the electron clouds of HOMO and LUMO are separated. Therefore, since the difference between the triplet energy and the singlet energy of the compound ( ⁇ Est) is less than 0.7 eV, even if the difference between the HOMO value and the LUMO value (E HOMO -E LUMO ) exceeds 3.0 eV, the triplet energy ( T1).
- EWG electron attracting electrons
- EDG electron donors
- the triplet energy of the bipolar compound included in the life improvement layer 304 may be 2.3 eV or more, but when it is made of green phosphor, it is 2.5 eV or more, and a blue phosphor. In the case of consisting of 2.7eV or more is preferable.
- the bipolar compound preferably has a hole mobility and electron mobility of 1 ⁇ 10 -6 cm 2 / V ⁇ s or more at room temperature. This is because when the compound is used in the life improvement layer 304, the injection of electrons can be prevented from being delayed relative to the number of holes injected from the anode 100, thereby improving the life of the organic EL device.
- Electrons or holes accumulated in the light emitting layer 303 may prevent oxidation and reduction from occurring smoothly in the light emitting layer 303 or may affect adjacent layers to reduce the lifetime of the organic EL device.
- the bipolar compound included in the life improvement layer 304 of the present invention exhibits hole mobility of 1 ⁇ 10 ⁇ 6 cm 2 / V ⁇ s or more at room temperature by an electron donor (EDG), (EWG) shows electron mobility at 1 ⁇ 10 ⁇ 6 cm 2 / V ⁇ s or more at room temperature.
- EDG electron donor
- EWG electron donor
- electrons may be effectively injected into the light emitting layer 303.
- the formation efficiency of excitons in the light emitting layer 303 may be increased, thereby improving the lifespan of the organic EL device.
- the bipolar compound has a fluorene moiety, which is an electron donor (EDG), and a six-membered heterocycle, which is an electron withdrawal group (EWG), by a linker group (phenylene, biphenylene, or terphenylene) to form a basic skeleton. It is preferable.
- the bipolar compound may be, for example, a compound represented by Chemical Formula 1.
- At least one of the life improvement layer 304, the electron transport layer 305, and the electron injection layer 306 includes the compound represented by Chemical Formula 1 above.
- the compound represented by Formula 1 may be any one of the compounds represented by Formulas 2 to 4.
- R a , R b , R 1 to R 3 , Z 1 to Z 5 , c, d and e are the same as defined in Chemical Formula 1, respectively.
- the structure (substituent) represented by (* is a site where a bond is formed with L) may be any one of the structures represented by the following C-1 to C-15.
- R 4 is as defined in Formula 1, and a plurality of R 4 are the same as or different from each other,
- R 5 is hydrogen, deuterium, halogen, cyano group, nitro group, C 1 -C 40 alkyl group, C 2 -C 40 alkenyl group, C 2 -C 40 alkynyl group, C 3 -C 40 cycloalkyl group, aryloxy nuclear atoms 3 to 40 of the heterocycloalkyl of the alkyl group, C 6 ⁇ C 60 aryl group, the number of nuclear atoms of 5 to 60 heteroaryl group, C 6 ⁇ C 60, alkyloxy group of C 1 ⁇ C 40 , C 6 ⁇ C 60 arylamine group, C 1 ⁇ C 40 alkylsilyl group, C 1 ⁇ C 40 alkyl boron group, C 6 ⁇ C 60 aryl boron group, C 6 ⁇ C 60 aryl phosphine group , C 6 ⁇ C 60 aryl phosphine oxide group and C 6 ⁇ C 60 arylsilyl group, or in combination with an adjacent
- p is an integer from 1 to 4,
- the arylphosphine group, arylphosphine oxide group and arylsilyl group are each independently deuterium, halogen group, cyano group, nitro group, C 1 ⁇ C 40 alkyl group, C 2 ⁇ C 40 alkenyl group, C 2 ⁇ C 40 Alkynyl group, C 6 ⁇ C 60 Aryl group, Nuclear 5 to 60 heteroaryl group, C 6 ⁇ C 60 Aryloxy group, C 1 ⁇ C 40 Alkyloxy group, C 6 ⁇ C 60 Aryl Amine group, C 3 -C 40 cycloalky
- the structure represented by is more preferably a structure represented by the above C-9.
- the compound represented by Formula 1 of the present invention may be a compound represented by the following Formula 5.
- R a , R b , R 1 to R 4 , L, c, d, e, m and n are the same as defined in Chemical Formula 1, respectively.
- the R 4 are the same as each other. That is, it is preferable that R ⁇ 4> is the same and has a symmetrical structure.
- R a and R b are the same as or different from each other, each independently, a methyl group or a phenyl group, It is preferable to form a condensed ring represented by (* is a site
- R 1 to R 3 are each independently hydrogen, deuterium, C 1 ⁇ C 40 alkyl group, C 6 ⁇ C 60 aryl group, nuclear atoms 5 to 60 It is preferably selected from the group consisting of a heteroaryl group and a C 6 ⁇ C 60 arylamine group.
- m and n are each an integer of 1 to 3, m is preferably 1, and n is preferably 1 or 2.
- L is preferably a single bond, phenylene, biphenylene or terphenylene.
- L which is a linker group, is preferably selected from the group consisting of structures represented by L-1 to L-9 (* is a bond site).
- Such a compound represented by the formula (1) of the present invention can be more specific to the compound represented by the formula (LE-01 to LE-12).
- alkyl means a monovalent substituent derived from a straight or branched chain saturated hydrocarbon having 1 to 40 carbon atoms.
- alkyl include, but are not limited to, methyl, ethyl, propyl, isobutyl, sec-butyl, pentyl, iso-amyl, hexyl and the like.
- alkenyl refers to a monovalent substituent derived from a straight or branched chain unsaturated hydrocarbon having 2 to 40 carbon atoms having at least one carbon-carbon double bond.
- alkenyl include, but are not limited to, vinyl, allyl, isopropenyl, 2-butenyl, and the like.
- alkynyl refers to a monovalent substituent derived from a straight or branched chain unsaturated hydrocarbon having 2 to 40 carbon atoms having at least one carbon-carbon triple bond.
- alkynyl include, but are not limited to, ethynyl, 2-propynyl, and the like.
- aryl refers to a monovalent substituent derived from an aromatic hydrocarbon having 6 to 60 carbon atoms combined with a single ring or two or more rings.
- a form in which two or more rings are attached to each other (pendant) or condensed may be included. Examples of such aryl include, but are not limited to, phenyl, naphthyl, phenanthryl, anthryl, and the like.
- heteroaryl means a monovalent substituent derived from monoheterocyclic or polyheterocyclic aromatic hydrocarbon having 5 to 60 nuclear atoms. At least one carbon in the ring, preferably 1 to 3 carbons, is substituted with a heteroatom such as N, O, S or Se.
- a form in which two or more rings are pendant or condensed with each other may be included, and in addition, a form may be included with a aryl group.
- heteroaryl examples include 6-membered monocyclic rings such as pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, triazinyl; Polycyclics such as phenoxathienyl, indolinzinyl, indolyl, purinyl, quinolyl, benzothiazole, carbazolyl ring; And 2-furanyl; N-imidazolyl; 2-isoxazolyl; 2-pyridinyl; 2-pyrimidinyl and the like, but are not limited thereto.
- aryloxy is a monovalent substituent represented by RO-, wherein R means aryl having 6 to 60 carbon atoms.
- R means aryl having 6 to 60 carbon atoms. Examples of such aryloxy include, but are not limited to, phenyloxy, naphthyloxy, diphenyloxy, and the like.
- alkyloxy is a monovalent substituent represented by R'O-, wherein R 'means alkyl having 1 to 40 carbon atoms.
- alkyloxy may include linear, branched or cyclic structures, such as methoxy, ethoxy, n-propoxy, 1-propoxy, t-butoxy, n -Butoxy, pentoxy, and the like, but are not limited thereto.
- arylamine refers to an amine substituted with aryl having 6 to 60 carbon atoms.
- cycloalkyl means a monovalent substituent derived from a monocyclic or polycyclic non-aromatic hydrocarbon having 3 to 40 carbon atoms.
- examples of such cycloalkyl include, but are not limited to, cyclopropyl, cyclopentyl, cyclohexyl, norbornyl, adamantine, and the like.
- Heterocycloalkyl as used herein means a monovalent substituent derived from a non-aromatic hydrocarbon having 3 to 40 nuclear atoms, wherein at least one carbon in the ring, preferably 1 to 3 carbons, is N, O, S Or a hetero atom such as Se.
- heterocycloalkyl include, but are not limited to, morpholine, piperazine, and the like.
- alkylsilyl means silyl substituted with alkyl having 1 to 40 carbon atoms
- arylsilyl means silyl substituted with aryl having 5 to 40 carbon atoms
- condensed ring means a condensed aliphatic ring, a condensed aromatic ring, a condensed heteroaliphatic ring, a condensed heteroaromatic ring, or a combination thereof.
- Such a compound represented by Formula 1 of the present invention can be synthesized in various ways with reference to the synthesis process of the following examples.
- the electron transport layer 305 and the electron injection layer 306 serve to move the electrons injected from the cathode 200 to the emission layer 303.
- the material forming the electron transport layer 305 and the electron injection layer 306 is not particularly limited as long as it is easy to inject electrons and has a high electron mobility, and the non-limiting examples include the compound represented by Formula 1, anthracene derivative, and hetero An aromatic compound and an alkali metal complex compound are mentioned.
- the electron transport layer 305 and / or the electron injection layer 306 is preferably made of the same material as the life improvement layer 304, that is, the compound represented by the formula (1).
- the electron transport layer 305 and / or the electron injection layer 306 may be a co-deposited alkali metal complex compound to facilitate the injection of electrons from the cathode.
- the alkali metal complex compound may be an alkali metal, an alkaline earth metal or a rare earth metal.
- the organic layer 300 may further include an organic layer (not shown) for blocking electrons and excitons between the hole transport layer 302 and the light emitting layer 303.
- the organic layer has a high LUMO value to prevent electrons from moving to the hole transport layer 302 and a high triplet energy to prevent the excitons of the light emitting layer 303 from diffusing into the hole transport layer 302.
- the material constituting the organic film layer is not particularly limited, and examples thereof include carbazole derivatives or arylamine derivatives.
- the method of manufacturing the organic material layer 300 according to an embodiment of the present invention is not particularly limited, and examples thereof include, but are not limited to, vacuum deposition and solution coating.
- Examples of the solution coating method may be spin coating, dip coating, doctor blading, inkjet printing, thermal transfer method and the like.
- the organic electroluminescent device has a structure in which the anode 100, the organic layer 300, and the cathode 200 are sequentially stacked, between the anode 100 and the organic layer 300, or the cathode ( An insulating layer or an adhesive layer may be further included between the 200 and the organic material layer 300.
- the organic electroluminescent device may have excellent life characteristics because the half-life time of the initial brightness is increased while maintaining the maximum luminous efficiency when voltage and current are applied.
- the glass substrate coated with ITO Indium tin oxide
- ITO Indium tin oxide
- a solvent such as isopropyl alcohol, acetone, methanol
- UV OZONE cleaner Power sonic 405, Hwasin Tech
- a device was manufactured by sequentially depositing a hole injection layer, a hole transport layer, a light emitting layer, a life improvement layer, an electron transport layer, an electron injection layer, and a cathode on an ITO transparent electrode (substrate) prepared as described above.
- the structure of the manufactured device is shown in Table 2 below.
- Electron injection layer cathode compound DS-205 (Doosan Corporation) NPB AND + 5% DS-405 (Doosan Corporation) LE-01 to LE-12 Alq 3 LiF Al thickness 80 nm 15 nm 30 nm 5 nm 25 nm 1nm 200 nm
- the device was manufactured in the same manner as in Example 1, except that the electron transport layer was deposited at 30 nm without using the life improving layer.
- a device was manufactured in the same manner as in Example 1, except that BCP having the following structure instead of LE-01 was used.
- the organic EL device of Examples 1 to 12 including the life improvement layer of the present invention is superior in current efficiency, driving voltage and lifetime than the organic EL device of Comparative Examples 1 and 2 .
- the glass substrate coated with ITO Indium tin oxide
- ITO Indium tin oxide
- a solvent such as isopropyl alcohol, acetone, methanol
- UV OZONE cleaner Power sonic 405, Hwasin Tech
- a device was manufactured by sequentially depositing a hole injection layer, a hole transport layer, a light emitting layer, a life improvement layer, an electron transport layer, an electron injection layer, and a cathode on an ITO transparent electrode (substrate) prepared as described above.
- the structure of the manufactured device is shown in Table 4 below.
- Electron injection layer cathode compound m-MTDATA TCTA CBP + 10% Ir (ppy) 3 See Table 5 below Alq 3 LiF Al thickness 60 nm 80 nm 30 nm 5 nm 25 nm 1nm 200 nm
- the device was manufactured in the same manner as in Example 1, except that the electron transport layer was deposited at 30 nm without using the life improving layer.
- a device was manufactured in the same manner as in Example 13, except that BCP having the following structure instead of LE-01 was used.
- the organic EL device of Examples 1 to 12 including the life improvement layer of the present invention is superior in current efficiency, driving voltage and lifetime than the organic EL device of Comparative Examples 1 and 2. .
Abstract
Description
화합물 | 계산값(B3LYP/6-31G*) | 실측값 | ||||
ΔEst (S1-T1) | 삼중항 에너지 | 이온화 포텐셜 | EHOMO-ELUMO | 전자이동도 | 정공이동도 | |
LE-01 | 0.42 | 2.78 | 5.92 | 3.49 | 6.8×10-4 | 7.3×10-5 |
LE-02 | 0.52 | 2.68 | 5.88 | 3.45 | 7.3×10-4 | 5.9×10-5 |
LE-03 | 0.47 | 2.71 | 5.93 | 3.56 | 8.1×10-4 | 7.6×10-5 |
LE-04 | 0.57 | 2.73 | 6.12 | 3.44 | 6.6×10-4 | 5.8×10-5 |
LE-05 | 0.51 | 2.81 | 5.97 | 3.63 | 7.3×10-4 | 8.3×10-5 |
LE-06 | 0.48 | 2.83 | 6.16 | 3.64 | 6.8×10-4 | 7.6×10-5 |
LE-07 | 0.49 | 2.82 | 5.97 | 3.60 | 7.8×10-4 | 8.1×10-5 |
LE-08 | 0.55 | 2.80 | 5.96 | 3.58 | 7.9×10-3 | 7.8×10-5 |
LE-09 | 0.52 | 2.82 | 6.01 | 3.62 | 7.3×10-4 | 7.7×10-5 |
LE-10 | 0.47 | 2.72 | 5.89 | 3.45 | 8.5×10-4 | 7.4×10-5 |
LE-11 | 0.38 | 2.65 | 5.87 | 3.41 | 6.7×10-4 | 6.8×10-5 |
LE-12 | 0.41 | 2.71 | 6.01 | 3.51 | 7.7×10-4 | 7.6×10-5 |
*정공이동도 및 전자이동도는 양극성 화합물을 1㎛ 두께로 성막하여 캐리어의 이동시간(Transit time)을 측정함. |
정공 주입층 | 정공 수송층 | 발광층 | 수면 개선층 | 전자 수송층 | 전자 주입층 | 음극 | ||
화합물 | DS-205 ((주)두산) | NPB | AND+5% DS-405((주)두산) | LE-01 내지 LE-12 | Alq3 | LiF | Al | |
두께 | 80nm | 15nm | 30nm | 5nm | 25nm | 1nm | 200nm |
화합물 | 구동전압(V) | 전류효율(cd/A) | 발광피크(nm) | 수명(hr, T97) | |
실시예 1 | LE-01 | 4.3 | 7.1 | 458 | 63 |
실시예 2 | LE-02 | 4.2 | 6.9 | 458 | 59 |
실시예 3 | LE-03 | 4.6 | 7.0 | 457 | 62 |
실시예 4 | LE-04 | 4.1 | 7.3 | 458 | 58 |
실시예 5 | LE-05 | 4.0 | 8.0 | 458 | 41 |
실시예 6 | LE-06 | 4.2 | 7.9 | 458 | 38 |
실시예 7 | LE-07 | 3.8 | 8.2 | 458 | 42 |
실시예 8 | LE-08 | 3.9 | 8.3 | 457 | 35 |
실시예 9 | LE-09 | 4.1 | 7.8 | 458 | 39 |
실시예 10 | LE-10 | 4.2 | 7.9 | 458 | 64 |
실시예 11 | LE-11 | 4.5 | 7.0 | 458 | 75 |
실시예 12 | LE-12 | 4.3 | 7.4 | 457 | 69 |
비교예 1 | - | 4.7 | 5.6 | 458 | 32 |
비교예 2 | BCP | 5.3 | 5.9 | 458 | 28 |
*수명은 수명측정기(맥사이언스社)를 통해 발광휘도가 97%되는 시간을 측정함. |
정공 주입층 | 정공 수송층 | 발광층 | 수명 개선층 | 전자 수송층 | 전자주입층 | 음극 | |
화합물 | m-MTDATA | TCTA | CBP+10% Ir(ppy)3 | 하기 표 5 참조 | Alq3 | LiF | Al |
두께 | 60nm | 80nm | 30nm | 5nm | 25nm | 1nm | 200nm |
화합물 | 구동전압(V) | 전류효율(cd/A) | 발광피크(nm) | 수명(hr, T97) | |
실시예 13 | LE-01 | 6.4 | 37.0 | 516 | 51 |
실시예 14 | LE-02 | 6.1 | 38.8 | 516 | 53 |
실시예 15 | LE-04 | 6.2 | 38.0 | 516 | 57 |
실시예 16 | LE-05 | 6.4 | 39.0 | 517 | 58 |
실시예 17 | LE-06 | 6.1 | 36.6 | 516 | 69 |
실시예 18 | LE-07 | 6.0 | 41.5 | 515 | 61 |
실시예 19 | LE-08 | 6.4 | 40.6 | 516 | 63 |
실시예 20 | LE-10 | 6.8 | 37.8 | 516 | 89 |
비교예 3 | - | 7.2 | 36.8 | 516 | 45 |
비교예 4 | BCP | 7.9 | 40.2 | 516 | 40 |
*수명은 수명측정기(맥사이언스社)를 통해 발광휘도가 97%되는 시간을 측정함 |
Claims (16)
- 양극; 음극; 및 상기 양극과 음극 사이에 개재(介在)된 유기물층을 포함하며,상기 유기물층은 하기 화학식 1로 표시되는 화합물을 포함하는 것인 유기 전계 발광 소자.[화학식 1]상기 화학식 1에서,Ra 및 Rb는 서로 동일하거나 상이하며, 각각 독립적으로 C1~C40의 알킬기 및 C6~C60의 아릴기로 이루어진 군에서 선택되거나, 또는 서로 결합하여 축합 고리를 형성하고,R1 내지 R3는 서로 동일하거나 상이하며, 각각 독립적으로 수소, 중수소, 할로겐기, 시아노기, 니트로기, 아미노기, C1~C40의 알킬기, C2~C40의 알케닐기, C2~C40의 알키닐기, C3~C40의 시클로알킬기, 핵원자수 3 내지 40의 헤테로시클로알킬기, C6~C60의 아릴기, 핵원자수 5 내지 60의 헤테로아릴기, C1~C40의 알킬옥시기, C6~C60의 아릴옥시기, C1~C40의 알킬실릴기, C6~C60의 아릴실릴기, C1~C40의 알킬보론기, C6~C60의 아릴보론기, C1~C40의 포스핀기, C1~C40의 포스핀옥사이드기 및 C6~C60의 아릴아민기로 이루어진 군에서 선택되거나, 또는 인접한 기와 결합하여 축합 고리를 형성하고,L은 단일결합이거나, 또는 C6~C18의 아릴렌기 및 핵원자수 5 내지 18의 헤테로아릴렌기로 이루어진 군에서 선택되고,Z1 내지 Z5는 서로 동일하거나 상이하며, 각각 독립적으로 N 또는 C(R4)이고, 이때 적어도 하나는 N이며, 상기 C(R4)가 복수인 경우 복수의 C(R4)는 서로 동일하거나 상이하고,c 및 e는 각각 0 내지 4의 정수이고,d는 0 내지 3의 정수이고,m 및 n은 각각 1 내지 3의 정수이고,상기 R4는 수소, 중수소, 할로겐기, 시아노기, 니트로기, 아미노기, C1~C40의 알킬기, C2~C40의 알케닐기, C2~C40의 알키닐기, C3~C40의 시클로알킬기, 핵원자수 3 내지 40의 헤테로시클로알킬기, C6~C60의 아릴기, 핵원자수 5 내지 60의 헤테로아릴기, C1~C40의 알킬옥시기, C6~C60의 아릴옥시기, C1~C40의 알킬실릴기, C6~C60의 아릴실릴기, C1~C40의 알킬보론기, C6~C60의 아릴보론기, C1~C40의 포스핀기, C1~C40의 포스핀옥사이드기 및 C6~C60의 아릴아민기로 이루어진 군에서 선택되거나, 또는 인접한 기와 결합하여 축합 고리를 형성하며,상기 Ra, Rb의 알킬기, 아릴기와, 상기 R1 내지 R4의 알킬기, 알케닐기, 알키닐기, 시클로알킬기, 헤테로시클로알킬기, 아릴기, 헤테로아릴기, 알킬옥시기, 아릴옥시기, 알킬실릴기, 아릴실릴기, 알킬보론기, 아릴보론기, 포스핀기, 포스핀옥사이드기, 아릴아민기와, 상기 L의 아릴렌기, 헤테로아릴렌기는 각각 독립적으로 중수소, 할로겐기, 시아노기, 니트로기, 아미노기, C1~C40의 알킬기, C2~C40의 알케닐기, C2~C40의 알키닐기, C3~C40의 시클로알킬기, 핵원자수 3 내지 40의 헤테로시클로알킬기, C6~C60의 아릴기, 핵원자수 5 내지 60의 헤테로아릴기, C1~C40의 알킬옥시기, C6~C60의 아릴옥시기, C1~C40의 알킬실릴기, C6~C60의 아릴실릴기, C1~C40의 알킬보론기, C6~C60의 아릴보론기, C1~C40의 포스핀기, C1~C40의 포스핀옥사이드기 및 C6~C60의 아릴아민기로 이루어진 군에서 선택된 1종 이상의 치환기로 치환 또는 비치환되고, 상기 치환기가 복수일 경우 복수의 치환기는 서로 동일하거나 상이하다.
- 제1항에 있어서,상기 유기물층은 정공 주입층, 정공 수송층, 발광층, 수명 개선층, 전자 수송층 및 전자 주입층으로 이루어진 군에서 선택된 1종 이상을 포함하고,상기 수명 개선층, 전자 수송층 및 전자 주입층 중 적어도 하나는 상기 화학식 1로 표시되는 화합물을 포함하는 것인 유기 전계 발광 소자.
- 제2항에 있어서,상기 수명 개선층은 상기 화학식 1로 표시되는 화합물을 포함하는 것인 유기 전계 발광 소자.
- 제3항에 있어서,상기 발광층이 녹색 인광 물질로 이루어지고, 상기 수명 개선층에 포함되는 상기 화학식 1로 표시되는 화합물은 이온화 포텐셜이 6.0eV 이상이고, 삼중항 에너지가 2.5eV 이상인 유기 전계 발광 소자.
- 제3항에 있어서,상기 발광층이 청색 인광 물질로 이루어지고, 상기 수명 개선층에 포함되는 상기 화학식 1로 표시되는 화합물은 이온화 포텐셜이 6.0eV 이상이고, 삼중항 에너지가 2.7eV 이상인 유기 전계 발광 소자.
- 제2항에 있어서,상기 전자 수송층이 상기 화학식 1로 표시되는 화합물을 포함하고, 상기 수명 개선층이 상기 화학식 1로 표시되는 화합물을 포함하며,상기 전자 수송층 및 수명 개선층의 화합물이 서로 동일한 화합물인 유기 전계 발광 소자.
- 제2항에 있어서,상기 전자 주입층이 상기 화학식 1로 표시되는 화합물을 포함하고, 상기 수명 개선층이 상기 화학식 1로 표시되는 화합물은 포함하며,상기 전자 주입층 및 수명 개선층의 화합물이 서로 동일한 화합물인 유기 전계 발광 소자.
- 제1항에 있어서,상기 화학식 1로 표시되는 화합물은 이온화 포텐셜이 5.5eV 이상이고, HOMO값과 LUMO값의 차이가 3.0eV를 초과하며, 삼중항 에너지가 2.3eV 이상이고, 일중항 에너지와 삼중항 에너지의 차이가 0.7eV 미만인 유기 전계 발광 소자.
- 제1항에 있어서,상기 화학식 1로 표시되는 화합물은 전자 이동도 및 정공 이동도가 상온에서 1×10-6cm2/V·s 이상인 유기 전계 발광 소자.
- 제1항에 있어서,상기 화학식 1로 표시되는 화합물의 (*는 L과 결합이 이루어지는 부위)로 표시되는 구조(치환체)가 하기 C-1 내지 C-15로 표시되는 구조로 이루어진 군에서 선택되는 것인 유기 전계 발광 소자.상기 C-1 내지 C-15에서,R4는 제1항에서 정의한 바와 같고,R5는 수소, 중수소, 할로겐, 시아노기, 니트로기, C1~C40의 알킬기, C2~C40의 알케닐기, C2~C40의 알키닐기, C3~C40의 시클로알킬기, 핵원자수 3 내지 40의 헤테로시클로알킬기, C6~C60의 아릴기, 핵원자수 5 내지 60의 헤테로아릴기, C6~C60의 아릴옥시기, C1~C40의 알킬옥시기, C6~C60의 아릴아민기, C1~C40의 알킬실릴기, C1~C40의 알킬보론기, C6~C60의 아릴보론기, C6~C60의 아릴포스핀기, C6~C60의 아릴포스핀옥사이드기 및 C6~C60의 아릴실릴기로 이루어진 군에서 선택되거나, 또는 인접하는 기와 결합하여 축합 고리를 형성하고,p는 1 내지 4의 정수이고,상기 R5의 알킬기, 알케닐기, 알키닐기, 시클로알킬기, 헤테로시클로알킬기, 아릴기, 헤테로아릴기, 아릴옥시기, 알킬옥시기, 아릴아민기, 알킬실릴기, 알킬보론기, 아릴보론기, 아릴포스핀기, 아릴포스핀옥사이드기 및 아릴실릴기는 각각 독립적으로 중수소, 할로겐기, 시아노기, 니트로기, C1~C40의 알킬기, C2~C40의 알케닐기, C2~C40의 알키닐기, C6~C60의 아릴기, 핵원자수 5 내지 60의 헤테로아릴기, C6~C60의 아릴옥시기, C1~C40의 알킬옥시기, C6~C60의 아릴아민기, C3~C40의 시클로알킬기, 핵원자수 3 내지 40의 헤테로시클로알킬기, C1~C40의 알킬실릴기, C1~C40의 알킬보론기, C6~C60의 아릴보론기, C6~C60의 아릴포스핀기, C6~C60의 아릴포스핀옥사이드기 및 C6~C60의 아릴실릴기로 이루어진 군에서 선택된 1종 이상의 치환기로 치환 또는 비치환되고, 이때 상기 치환기가 복수일 경우, 복수의 치환기는 서로 동일하거나 상이하다.
- 제12항에 있어서,상기 R4는 서로 동일한 것인 유기 전계 발광 소자.
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CN102372665A (zh) * | 2010-08-20 | 2012-03-14 | 清华大学 | 一种芳基芴类化合物及应用 |
KR20140101661A (ko) * | 2011-11-22 | 2014-08-20 | 이데미쓰 고산 가부시키가이샤 | 방향족 복소고리 유도체, 유기 일렉트로루미네선스 소자용 재료 및 유기 일렉트로루미네선스 소자 |
KR20130094903A (ko) * | 2012-02-17 | 2013-08-27 | 롬엔드하스전자재료코리아유한회사 | 신규한 유기 발광 화합물 |
KR20140046541A (ko) * | 2012-10-04 | 2014-04-21 | 롬엔드하스전자재료코리아유한회사 | 신규한 유기 전계 발광 화합물 및 이를 포함하는 유기 전계 발광 소자 |
WO2015152650A1 (ko) * | 2014-04-04 | 2015-10-08 | 주식회사 엘지화학 | 헤테로고리 화합물 및 이를 포함하는 유기 발광 소자 |
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CN107799658A (zh) * | 2016-08-29 | 2018-03-13 | 株式会社半导体能源研究所 | 发光元件、发光装置、电子设备、照明装置及有机金属配合物 |
CN107799658B (zh) * | 2016-08-29 | 2021-05-28 | 株式会社半导体能源研究所 | 发光元件、发光装置、电子设备、照明装置及有机金属配合物 |
US11024809B2 (en) | 2016-08-29 | 2021-06-01 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting element, light-emitting device, electronic device, lighting device, and organometallic complex |
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