WO2015099481A1 - 유기 전계 발광 소자 - Google Patents
유기 전계 발광 소자 Download PDFInfo
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- WO2015099481A1 WO2015099481A1 PCT/KR2014/012888 KR2014012888W WO2015099481A1 WO 2015099481 A1 WO2015099481 A1 WO 2015099481A1 KR 2014012888 W KR2014012888 W KR 2014012888W WO 2015099481 A1 WO2015099481 A1 WO 2015099481A1
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- H—ELECTRICITY
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/622—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing four rings, e.g. pyrene
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- H10K85/649—Aromatic compounds comprising a hetero atom
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- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
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- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
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- H10K50/166—Electron transporting layers comprising a multilayered structure
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- H10K85/321—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
- 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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- H10K85/342—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising iridium
Definitions
- the present invention relates to an organic electroluminescent device comprising at least one 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, depending on 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 cannot theoretically exceed 25% according to the production rate, and the external quantum efficiency is accepted as a limit of 5%.
- Phosphorescent electroluminescent devices that emit light by triplet excitons exhibit luminous efficiency up to four times higher than fluorescence when a metal complex compound containing transition metal heavy atoms such as Ir and Pt is used as the phosphorescent dopant. Can be improved.
- the phosphorescent electroluminescent device exhibits higher efficiency than fluorescence in terms of luminous efficiency on the basis of the theoretical fact.
- a phosphorescent dopant having a deep blue color purity and a high efficiency is satisfied. Since the development level of the host of the energy gap is insufficient, the blue phosphor is not commercialized yet, and the blue phosphor is used in the product.
- the present invention has been made to solve the above problems, and an object thereof is to provide an organic electroluminescent device having high efficiency, low voltage, and long life.
- the present invention is an anode; cathode; And at least one organic material layer selected from the group consisting of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer between the anode and the cathode, and a lifetime improvement layer (Lifetime) between the light emitting layer and the electron transport layer. It provides an organic electroluminescent device further comprising an Enhancement Layer (LEL).
- LEL Enhancement Layer
- the life improvement layer includes a bipolar compound having both an electron attractor (EWG) having a high electron absorption and an electron donor (EDG) having a large electron donor, wherein the bipolar compound includes the following (a) ) To (d) all of the conditions are characterized.
- the triplet energy is at least 2.3 eV
- FIG. 1 is a cross-sectional view illustrating an organic EL device according to an exemplary embodiment of the present invention.
- hole injection layer 302 hole transport layer
- 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 at least one selected from the group consisting of a hole injection layer, a hole transport layer, a light emitting layer, a life improvement layer, an electron transport layer, and an electron injection layer.
- the Lifetime Enhancement Layer is an organic electroluminescent device including a bipolar compound having both an electron attractor (EWG) having high electron absorption and an electron donor (EDG) having a large electron donor. It is about.
- the bipolar compound may be used as a material of an electron transport layer, an electron injection layer, or both, in addition to the life improvement layer.
- the anode 100 serves to inject holes into the organic material layer 300.
- the material constituting the positive electrode 100 is not particularly limited, and conventional materials known in the art may be used.
- Non-limiting 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: Al and SnO 2 : Sb; Conductive polymers such as polythiophene, poly (3-methylthiophene), poly [3,4- (ethylene-1,2-dioxy) thiophene] (PEDT), polypyrrole and polyaniline; And carbon black.
- 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: Al and SnO 2 : Sb;
- the method of manufacturing the positive electrode 100 is not particularly limited, and may be prepared according to conventional methods known in the art. As an example, a method of coating an anode material on a substrate made of a silicon wafer, quartz, glass plate, metal plate or plastic film may be mentioned.
- the cathode 200 serves to inject electrons into the organic material layer 300.
- the material constituting the cathode 200 is not particularly limited, and conventional materials known in the art may be used. Non-limiting 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 of manufacturing the cathode 200 is also not particularly limited, and may be manufactured according to methods known in the art.
- the organic material layer 300 included in the organic electroluminescent device according to the present invention can be used as an organic material layer of the existing organic electroluminescent device without limitation, for example, a hole injection layer 301, a hole transport layer 302, a light emitting layer ( 303), the life improvement layer 304, the electron transport layer 305 and the electron injection layer 306 may include one or more selected from the group.
- a hole injection layer 301 a hole transport layer 302
- the life improvement layer 304 the electron transport layer 305 and the electron injection layer 306 may include one or more selected from the group.
- the hole injection layer 301 and the hole transport layer 302 included in the organic material layer 300 of the present invention serve to move the holes injected from the anode 100 to the light emitting layer 303.
- the material forming the hole injection layer 301 and the hole transport layer 302 is not particularly limited as long as the hole injection barrier is low and the hole mobility is high, and the hole injection layer / transport layer material used in the art can be used without limitation. have. Non-limiting examples thereof include arylamine derivatives.
- the light emitting layer 303 included in the organic material layer 300 of the present invention is a layer in which holes and electrons meet to form an exciton, and the color of light emitted from the organic EL device according to the material forming the light emitting layer 303. This may vary.
- the light emitting layer 303 may include a host and a dopant, and the host may be included in the range of 70 to 99.9 wt%, and the dopant may be included in the range of 0.1 to 30 wt%.
- the host when the light emitting layer 303 is blue fluorescence, green fluorescence or red fluorescence, the host may be included in the range of 80 to 99.9% by weight and the dopant in the range of 0.1 to 20% by weight. In addition, when the emission layer 303 is blue fluorescence, green fluorescence or red phosphorescence, the host may be included in the range of 70 to 99 wt% and the dopant in the range of 1 to 30 wt%.
- the host included in the light emitting layer 303 is not particularly limited as long as it is known in the art, and non-limiting examples thereof include alkali metal complex compounds; Alkaline earth metal complexes; Or condensed aromatic ring derivatives.
- the host material may be an aluminum complex, a beryllium complex, anthracene derivative, pyrene derivative, triphenylene derivative, carbazole derivative, dibenzofuran derivative, di Preference is given to using benzothiophene derivatives or one or more combinations thereof.
- the dopant included in the emission layer 303 is not particularly limited as long as it is known in the art, and non-limiting examples thereof include anthracene derivative, pyrene derivative, arylamine derivative, iridium (Ir) or platinum (Pt).
- the metal complex compound etc. which are included are mentioned.
- the light emitting layer 303 may be a single layer or two or more layers.
- the organic light emitting diode may emit light of various colors.
- the present invention includes a light emitting layer made of a plurality of single materials between the hole transport layer 302 and the life improvement layer 304, or an organic electroluminescent device having a mixed color by having a light emitting layer made of different materials in series. Can be provided.
- the driving voltage of the device is increased, but the current value in the organic light emitting device is constant, thereby providing an organic EL device having improved light emission efficiency by the number of light emitting layers.
- the lifespan improvement layer 304 included in the organic material layer 300 of the present invention is to improve the lifespan 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, but is preferably a bipolar compound having both an electron attractor (EWG) having high electron absorption and an electron donor (EDG) having a large electron donor. .
- the bipolar compound has an ionization potential of 5.5 eV or more, specifically, may be in the range of 5.5 to 7.0 eV, preferably in the range of 5.5 to 6.5 eV.
- the difference between the HOMO value and the LUMO value (E HOMO -E LUMO ) of the bipolar compound may be greater than 2.9 eV, specifically, greater than 2.9 eV and less than 3.5 eV.
- the triplet energy may be 2.3 eV or more, specifically, 2.3 to 3.5 eV, and preferably 2.3 to 3.0 eV.
- the singlet energy and triplet energy difference ⁇ Est of the bipolar compound is less than 0.5 eV, specifically, the compound is less than 0.5 eV, 0.01 eV or more range.
- the holes move in the organic electroluminescent device at the ionization potential level.
- the holes diffuse or move to the electron transport layer 305 beyond the light emitting layer 303, an irreversible decomposition reaction by oxidation occurs, which causes organic electroluminescence. The lifetime of the device is reduced.
- the life improvement layer 304 made of a bipolar compound having an ionization potential [Ip (LEL)] of 5.5 eV or more is provided, the hole is prevented from diffusing or moving to the electron transport layer 305, and thus the organic electric field.
- the life of the light emitting device can be improved. 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 just 5.5 eV or more, but the light emitting layer 303 may be a green phosphor or a blue phosphorescent light.
- the ionization potential of the bipolar compound is preferably 6.0 eV or more.
- the bipolar compound has a difference between HOMO and LUMO (E HOMO -E LUMO ) of more than 2.9 eV, triplet energy of 2.3 eV or more, singlet energy and triplet energy difference ( ⁇ Est) of less than 0.5 eV. Therefore, when it is used for the life improvement layer 304, the exciton formed in the light emitting layer 303 is prevented from diffusing into the electron transporting layer 305, and light emission occurs at the interface between the light emitting layer 303 and the electron transporting layer 305. You can also stop. 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.
- E HOMO -E LUMO the exciton formed in the light emitting layer 303 is prevented from diffusing into the electron transporting layer 305, and light emission occurs at the interface between the light emitting layer 303 and the electron transporting layer 305. You can also stop. As a result, it is possible
- the bipolar compound has both the electron attracting force (EWG) and the electron donor (EDG) with the high electron donor (EDG) has a characteristic that the electron cloud of HOMO and LUMO is separated.
- EWG electron attracting force
- EDG electron donor
- EDG electron donor
- T1 triplet energy
- the triplet energy of the bipolar compound included in the lifespan improvement layer 304 may be 2.3 eV or more, but when the light emitting layer 303 is made of green phosphorescent material, In the case of 2.5 eV or more and a blue phosphor, it is preferably 2.7 eV or more.
- the electrons or holes that do not form excitons by recombination may be light emitting layers 303. Stacked). 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 lifespan of the organic EL device.
- the bipolar compound has a hole mobility and an electron mobility of 1 ⁇ 10 ⁇ 6 cm 2 / V ⁇ s or more at room temperature, when used in the life improvement layer 304, holes injected from the anode 100 are used.
- the life of the organic EL device can be improved by preventing the injection of electrons to be delayed compared to the number of.
- 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) results in electron mobility of 1 ⁇ 10 ⁇ 6 cm 2 / V ⁇ s or more at room temperature. Therefore, when it is used for the lifespan improvement layer 304, electrons can be effectively injected into the light emitting layer 303. As such, when the electron injection into the light emitting layer 303 is smooth, the formation efficiency of the exciton in the light emitting layer 303 may be improved, thereby improving the life of the organic EL device.
- EDG electron donor
- the bipolar compound included in the life improvement layer 304 of the present invention has a moiety having an electron attracting (EWG) characteristic with high electron absorption and a moiety having a large electron donor (EDG) characteristic with an electron donor. Is formed by combining.
- EWG electron attracting
- EWG electron donor
- the electron drawer (EWG) is characterized in that it comprises one or more electron drawer (EWG) moiety represented by the following formula.
- a 1 to A 11 are the same as or different from each other, each independently N or C (R), and at least one is N, wherein a plurality of R's are the same or different, respectively, even if the same are indicated, and they are condensed with adjacent groups May form a ring.
- R plural C
- R 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 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 to C 40 alkylsilyl group, C 6 to C 60 arylsilyl group, C 1 to C 40 alkyl boron group, C 6 to C 60 aryl boron group, C 1 to C 40 A phosphine group, a C 1 to C 40 phosphine oxide group and a C 6 to C 60 arylamine group,
- the pin group, the phosphine oxide group and the arylamine group are each independently 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 cycloalkyl group, nuclear atoms, 3 to 40 heterocycloalkyl group, C 6 ⁇ C 40 aryl group, nuclear atoms aryl of from 5 to 40 heteroaryl group, a C 1 ⁇ C 40 alkyl Oxy group, C 6 ⁇ C 60 ary
- the electron attracting (EWG) moiety is a nitrogen-containing heteroaromatic hydrocarbon having 5 or 6 nuclear atoms in which 1-3 carbons are substituted with nitrogen.
- the EWG moiety may have a form in which two or more rings are simply attached to or condensed with each other, or in the form of an aryl group.
- the electron attracting moiety (EWG) moiety may be more embodied in a structure represented by the following formula, it is preferable when the six-membered nitrogen heteroaromatic hydrocarbon containing 1 to 3 nitrogen.
- EWG moieties include pyridine, pyrimidine, triazine, pyrazine and the like.
- the carbon or nitrogen atom of the moiety having the electron-extracting (EWG) property having high electron absorption forms a bond with the moiety having the electron donor (EDG) property having a large electron donating property.
- the bipolar compound included in the lifespan improvement layer 304 of the present invention is characterized by including an electron donor (EDG) moiety represented by the following Chemical Formula 1.
- EDG electron donor
- moieties having large electron donor (EDG) characteristics of electron donors include condensed nitrogen heteroaromatic rings such as indole, carbazole, and azepine;
- condensed polycyclic aromatic rings such as biphenyl, triphenylene, and fluoranthene may be used, and more specifically, may be represented by the following Chemical Formula 1.
- X 1 is selected from the group consisting of O, S, Se, N (Ar 1 ), C (Ar 2 ) (Ar 3 ) and Si (Ar 4 ) (Ar 5 ),
- Y 1 to Y 4 are the same as or different from each other, and each independently N or C (R 1 ), wherein a plurality of R 1 are each the same or different even if represented the same, and they may form a condensed ring with an adjacent group
- X 2 and X 3 are the same as or different from each other, and each independently N or C (R 2 ), wherein a plurality of R 2 are the same or different, even though they are the same, and they may form condensed rings with adjacent groups
- R 1 to R 2 and Ar 1 to Ar 5 are the same as or different from each other, and each independently, hydrogen, deuterium, a halogen group, a cyano group, a nitro group, an amino group, a 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 6 to C 60 aryl group, nuclear atom 5 to 60 Heteroaryl group, C 1 ⁇ 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, is selected from the group consisting of C 6 ⁇ C group 60 arylboronic of, C 1 ⁇ C 40 of the phosphine group, C 1 ⁇ C 40 phosphine
- Alkyl boron group, aryl boron group, phosphine group, phosphine oxide group and arylamine group are each independently deuterium, halogen group, cyano group, nitro group, amino group, C 1 ⁇ C 40 alkyl group, C 2 ⁇ 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 6 to C 40 aryl group, nuclear atom 5 to 40 hetero aryl group, C 1 ⁇ C 40 of the alkyloxy group, C 6 ⁇ C 60 of the ary
- Chemical Formula 1 may be more embodied as any one of the following A-1 to A-24. However, it is not limited thereto.
- R 2 , Y 1 to Y 4, and Ar 1 to Ar 5 are the same as those of Formula 1 described above.
- the electron donor (EDG) moiety is preferably A-1 to A-6.
- Formula 1 which is an electron donor (EDG) moiety
- EDG electron donor
- Y 1 to Y 4 are each independently N or C (R 1 ), and when they are a plurality of C (R 1 ), Y 1 and Y 2 , Y 2 and Y 3 or Y 3 And one of Y 4 forms a condensed ring with Formula 2 below.
- R 1 may be the same or different, respectively.
- both X 2 And X 3 In Formula 1 is C (R 2 )
- a plurality of R 2 may be combined with Formula 2 or Formula 3, respectively, to form a condensed ring.
- Y 5 to Y 14 are the same as or different from each other, and each independently N or C (R 3 ), wherein when a plurality of C (R 3 ) is a plurality of R 3 are the same or different, respectively, and are bonded to the formula (1)
- N or C (R 3 ) is a plurality of R 3 are the same or different, respectively, and are bonded to the formula (1)
- X 4 is the same as X 1 , wherein a plurality of Ar 1 to Ar 5 are the same or different, respectively.
- a plurality of R 3 non-forming a condensed ring may be the same or different from each other even if they are the same, and each independently represent hydrogen, deuterium, a halogen group, a cyano group, a nitro group, an amino group, a C 1 to C 40 alkyl group, C 2 ⁇ C 40 alkenyl group, C 2 ⁇ C 40 of the alkynyl group, C 3 ⁇ C 40 cycloalkyl group, a number of nuclear atoms of 3 to 40 heterocycloalkyl group, C 6 ⁇ C 60 aryl group, a nuclear Heteroaryl group of 5 to 60 atoms, C 1 ⁇ C 40 alkyloxy group, C 6 ⁇ C 60 aryloxy group, C 1 ⁇ C 40 alkylsilyl group, C 6 ⁇ C 60 arylsilyl group, C 1 ⁇ alkyl boron C 40 group, C 6 ⁇ C 60 aryl boron group, C 1 ⁇ C 40
- the phosphine group, the phosphine oxide group and the arylamine group are each independently 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 to C 40 cycloalkyl group, nuclear atom 3 to 40 heterocycloalkyl group, C 6 to C 40 aryl group, nuclear atom 5 to 40 heteroaryl group, C 1 to C 40 Alkyloxy group, C 6 ⁇ C
- the compound formed by condensation of Chemical Formula 1 and Chemical Formula 2 may be embodied in any one of the compounds represented by the following Chemical Formulas 1a to 1f.
- X 1 to X 4 and Y 1 to Y 8 are as defined in the formula (1) and (2).
- Y 1 to Y 4 which form a condensed ring are N or C (R 1 ), all of which are preferred when C (R 1 ), and Y 5 to Y 8 are N Or C (R 3 ), all of which are C (R 3 ).
- R 1 and R 3 are the same or different, respectively.
- Ar 1 and R 1 to R 3 are the same as defined in the formula (1) and (2).
- Ar 1 is a substituted or unsubstituted C 6 ⁇ C 40 aryl group, or a substituted or unsubstituted heteroaryl group having 5 to 40 nuclear atoms,
- R 1 to R 3 are each independently hydrogen, a substituted or unsubstituted C 1 to C 40 alkyl group, a substituted or unsubstituted C 6 to C 40 aryl group, or a substituted or unsubstituted nuclear atom 5 to 40 It is preferable when it is a heteroaryl group of.
- Formulas B-1 to B-30 having a condensed structure of Formulas 1 and 2 include one or more condensed indole or condensed carbazole moieties.
- the compound formed by condensation of Formula 1 and Formula 3 may be embodied as any one of the compounds represented by the following Formulas 1g to 1n.
- X 1 , X 3 to X 4 and Y 1 to Y 14 are the same as defined in Formula 1 and Formula 3.
- X 1 and X 4 are the same as or different from each other, preferably each independently O, S or N (Ar 1 ), more preferably all N (Ar 1 ). At this time, a plurality of Ar 1 is the same or different.
- Y 1 to Y 4 are the same as or different from each other, and each independently N or C (R 1 ), preferably all of C (R 1 ). In this case, a plurality of R 1 are the same or different.
- X 3 are each independently N or C (R 2 ),
- Y 5 to Y 14 are the same as or different from each other, and each independently N or C (R 3 ), preferably all of C (R 3 ). In this case, a plurality of R 3 are the same or different.
- Ar 1 and R 1 to R 3 are as defined in the formula (1) and (3).
- X 1 and X 4 are each independently N (Ar 1 ) or S. That is, it is preferable that X 1 is N (Ar 1 ) and X 4 is S, X 1 is S and X 4 is N (Ar 1 ), or both X 1 and X 4 are N (Ar 1 ).
- Ar 1 is preferably a substituted or unsubstituted C 6 ⁇ C 60 aryl group, or a substituted or unsubstituted heteroaryl group having 5 to 60 nuclear atoms
- Ar 2 to Ar 5 is the same as or different from each other, and each independently represent a substituted or unsubstituted C 1 to C 40 alkyl group (specifically, a methyl group) or a substituted or unsubstituted C 6 to C 60 aryl group (specifically, a phenyl group) desirable.
- the chemical formulas having the condensed structure of Chemical Formulas 1 and 3 have the characteristics of an electron donor (EDG) having a large electron donor including one or more condensed azepine moieties.
- EDG electron donor
- the bipolar compound included as a material for the lifespan improvement layer may include a moiety having an electron donor (EDG) characteristic of which the electron donor represented by the following Chemical Formula 4 is large.
- EDG electron donor
- L 1 to L 3 are the same as or different from each other, and each independently selected from the group consisting of a single bond, a C 6 to C 60 arylene group, a heteroarylene group having 5 to 60 nuclear atoms,
- Ar 6 to Ar 8 are the same as or different from each other, and are each independently selected from the group consisting of hydrogen, deuterium, an aryl group having 6 to 40 carbon atoms and a heteroaryl group having 5 to 40 nuclear atoms, provided that Ar 6 to Ar Except when 8 are all the same,
- R 4 to R 6 are the same or different, each independently, hydrogen, deuterium, a halogen group, a cyano group, a nitro group, an amino group, an alkenyl group of C 1 ⁇ C 40 alkyl group, C 2 ⁇ C 40 of, C 2 Alkynyl group of ⁇ C 40 , cycloalkyl group of C 3 ⁇ C 40 , heterocycloalkyl group of 3 to 40 nuclear atoms, aryl group of C 6 ⁇ C 60 , heteroaryl group of 5 to 60 nuclear atoms, C 1 ⁇ 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 ⁇ is selected from the group consisting of C 60 aryl boron group, C 1 ⁇ C 40 of the phosphine group, C 1 ⁇ C 40 pho
- a to c are each independently an integer of 0 to 3
- the time period, aryloxy group, alkylsilyl group, arylsilyl group, alkyl boron group, aryl boron group, phosphine group, phosphine oxide group and arylamine group are each independently 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 Cycloalkyl group, C 3 ⁇ 40 Heterocycloalkyl group, C 6 ⁇ C 40 aryl group, nuclear atom 5 to 40 heteroaryl group, C 1
- L One To L 3 It is preferably each independently a single bond, phenylene, biphenylene, or carbazolylene.
- Ar 6 to Ar 8 are the same as or different from each other, and are each independently selected from the group consisting of hydrogen, deuterium, an aryl group having 6 to 40 carbon atoms and a heteroaryl group having 5 to 40 nuclear atoms, wherein Ar 6 to At least one of Ar 8 is preferably selected from a heteroaryl group having 5 to 40 nuclear atoms including at least one element selected from the group consisting of N, O, and S. However, the case where Ar 6 to Ar 8 are all the same is excluded.
- At least one of R 1 to R 6 and Ar 1 to Ar 8 is the moiety having an electron-withdrawing (EWG) property of high electron absorption Form a bond with.
- EWG electron-withdrawing
- Alkyl in the present invention is a monovalent substituent derived from a straight or branched chain saturated hydrocarbon having 1 to 40 carbon atoms, and examples thereof include methyl, ethyl, propyl, isobutyl, sec-butyl, pentyl, iso-amyl, hexyl and the like. Can be mentioned.
- Alkenyl in the present invention is a monovalent substituent derived from a straight or branched chain unsaturated hydrocarbon having 2 to 40 carbon atoms having one or more carbon-carbon double bonds. Examples thereof include vinyl and allyl. ), Isopropenyl, 2-butenyl, and the like.
- Alkynyl in the present invention is a monovalent substituent derived from a C2-C40 straight or branched chain unsaturated hydrocarbon having one or more carbon-carbon triple bonds. Examples thereof include ethynyl, 2- Propanyl (2-propynyl) etc. are mentioned.
- Aryl in the present invention means 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 also be included.
- aryls include phenyl, naphthyl, phenanthryl, anthryl and the like.
- Heteroaryl in the present invention 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 also be included, and may also include a form condensed with an aryl group.
- heteroaryl examples include 6-membered monocyclic rings such as pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, triazinyl, phenoxathienyl, indolinzinyl, indolyl ( polycyclic rings such as indolyl, purinyl, quinolyl, benzothiazole, carbazolyl, 2-furanyl, N-imidazolyl, 2-isoxazolyl , 2-pyridinyl, 2-pyrimidinyl, and the like.
- 6-membered monocyclic rings such as pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, triazinyl, phenoxathienyl, indolinzinyl, indolyl ( polycyclic rings such as indolyl, purinyl, quinolyl, benzothiazole, carbazolyl, 2-furany
- Aryloxy in the present invention is a monovalent substituent represented by RO-, wherein R means aryl having 6 to 60 carbon atoms. Examples of such aryloxy include phenyloxy, naphthyloxy, diphenyloxy and the like.
- Alkyloxy in the present invention is a monovalent substituent represented by R'O-, wherein R 'means 1 to 40 alkyl, and includes a linear, branched or cyclic structure It is interpreted as. Examples of such alkyloxy include methoxy, ethoxy, n-propoxy, 1-propoxy, t-butoxy, n-butoxy, pentoxy and the like.
- Arylamine in the present invention means an amine substituted with aryl having 6 to 60 carbon atoms.
- Cycloalkyl in the present invention means a monovalent substituent derived from a monocyclic or polycyclic non-aromatic hydrocarbon having 3 to 40 carbon atoms.
- Examples of such cycloalkyl include cyclopropyl, cyclopentyl, cyclohexyl, norbornyl, adamantine and the like.
- Heterocycloalkyl in the present invention 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 Substituted with a hetero atom such as Se.
- heterocycloalkyl include morpholine, piperazine and the like.
- Alkylsilyl in the present invention is silyl substituted with alkyl having 1 to 40 carbon atoms
- arylsilyl means silyl substituted with aryl having 6 to 40 carbon atoms.
- Condensed ring in the present invention means a condensed aliphatic ring, a condensed aromatic ring, a condensed heteroaliphatic ring, a condensed heteroaromatic ring or a combination thereof.
- the electron transport layer 305 and the electron injection layer 306 included in the organic material layer 300 serves to move the electrons injected from the cathode 200 to the light emitting layer 303. do.
- the material constituting 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 high electron mobility, but is not limited thereto.
- the bipolar compound, anthracene derivative, and heteroaromatic compound may be used. And alkali metal complex compounds.
- the electron transport layer 305 and / or the electron injection layer 306 of the present invention is preferably made of the same bipolar material, that is, the bipolar 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 material layer 300 of the present invention as described above may further include an organic film 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 has 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 such an 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 of the present invention is not particularly limited, but non-limiting examples include a vacuum deposition method and a solution coating method.
- the solution coating method may be spin coating, dip coating, doctor blading, inkjet printing, thermal transfer method and the like.
- the organic electroluminescent device of the present invention has a structure in which the anode 100, the organic material layer 300 and the cathode 200 are sequentially stacked, between the anode 100 and the organic material layer 300 or between the cathode 200 and the organic material layer
- the insulating layer or the adhesive layer may be further included between the 300.
- Such an organic electroluminescent device of the present invention may have excellent lifespan characteristics since life time of initial brightness is increased while maintaining the maximum luminous efficiency when voltage, current, or both are applied.
- the bipolar compounds LE-01 to LE-36 are shown below, respectively.
- 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.
- Hole injection layer DS-205 (Doosan Corporation) 80 nm Hole transport layer NPB 15 nm Light emitting layer ADN + 5% DS-405 (Doosan Corporation) 30 nm Life Improvement Layer LE-01 to LE-36 5 nm Electron transport layer Alq 3 25 nm Electron injection layer LiF 1nm cathode Al 200 nm
- a 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 life than the organic EL device of Comparative Examples 1 and 2 there was.
- 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.
- m-MTDATA, TCTA, Ir (ppy) 3 and the structure of the CBP is as follows.
- a device was manufactured in the same manner as in Example 37, except that an electron transport layer was deposited at 30 nm without using a lifetime improving layer.
- a device was manufactured in the same manner as in Example 37, except for using the BCP used in Comparative Example 2 instead of LE-02.
- the present invention can provide an organic EL device having excellent driving voltage, luminous efficiency and lifetime by introducing a lifetime improving layer, an electron transporting layer, or an electron injection layer formed of a bipolar compound having specific physical properties into the organic EL device. have.
- a display panel having improved performance and lifespan can be provided as the organic electroluminescent device of the present invention is applied to a display panel.
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Abstract
Description
| 계산값(B3LYP/6-31G*) | 실측값 | |||||
| 양극성 화합물 | ΔEst(S1-T1) | 삼중항 에너지 | 이온화포텐셜 | EHOMO-ELUMO | 전자이동도 | 정공이동도 |
| LE-01 | 0.058 | 2.39 | 5.54 | 3.55 | 8.9X10-5 | 5.5X10-5 |
| LE-02 | 0.168 | 2.45 | 5.50 | 3.47 | 5.8X10-5 | 3.3X10-5 |
| LE-03 | 0.355 | 2.54 | 5.71 | 3.3 | 8.8X10-4 | 1.1X10-5 |
| LE-04 | 0.059 | 2.53 | 5.6 | 3.37 | 7.6X10-4 | 1.2X10-5 |
| LE-05 | 0.138 | 2.65 | 5.58 | 3.43 | 7.5X10-4 | 9.0X10-5 |
| LE-06 | 0.177 | 2.50 | 5.64 | 3.07 | 9.6X10-4 | 9.9X10-5 |
| LE-07 | 0.121 | 2.48 | 5.65 | 3.42 | 9.2X10-4 | 9.6X10-5 |
| LE-08 | 0.298 | 2.74 | 6.01 | 3.33 | 5.1X10-5 | 5.5X10-5 |
| LE-09 | 0.291 | 2.38 | 5.71 | 3.32 | 9.9X10-4 | 2.5X10-5 |
| LE-10 | 0.321 | 2.35 | 5.69 | 3.31 | 1.0X10-5 | 6.5X10-5 |
| LE-11 | 0.261 | 2.81 | 6.01 | 3.36 | 9.9X10-5 | 4.1X10-5 |
| LE-12 | 0.340 | 2.78 | 6.05 | 3.23 | 1.1X10-6 | 5.4X10-5 |
| LE-13 | 0.235 | 2.59 | 5.50 | 3.51 | 1.3X10-6 | 1.1X10-5 |
| LE-14 | 0.265 | 2.51 | 5.51 | 3.41 | 2.1X10-6 | 1.6X10-5 |
| LE-15 | 0.049 | 2.59 | 5.56 | 3.50 | 7.5X10-5 | 5.5X10-5 |
| LE-16 | 0.051 | 2.54 | 5.51 | 3.49 | 8.5X10-6 | 4.5X10-5 |
| LE-17 | 0.058 | 2.43 | 5.64 | 3.15 | 7.8X10-5 | 5.0X10-5 |
| LE-18 | 0.074 | 2.50 | 5.68 | 3.24 | 6.5X10-4 | 4.2X10-5 |
| LE-19 | 0.082 | 2.45 | 5.73 | 3.20 | 7.5X10-4 | 8.5X10-5 |
| LE-20 | 0.168 | 2.56 | 5.70 | 3.17 | 5.8X10-5 | 3.3X10-5 |
| LE-21 | 0.235 | 2.48 | 5.60 | 3.14 | 6.4X10-4 | 6.1X10-5 |
| LE-22 | 0.129 | 2.57 | 5.70 | 2.93 | 7.0X10-4 | 4.2X10-5 |
| LE-23 | 0.090 | 2.53 | 5.83 | 3.54 | 7.0X10-5 | 5.5X10-5 |
| LE-24 | 0.044 | 2.47 | 5.69 | 3.06 | 6.6X10-3 | 9.1X10-5 |
| LE-25 | 0.157 | 2.43 | 5.99 | 3.10 | 8.1X10-4 | 7.9X10-5 |
| LE-26 | 0.054 | 2.39 | 5.82 | 3.23 | 9.5X10-3 | 9.4X10-5 |
| LE-27 | 0.121 | 2.41 | 5.75 | 3.12 | 3.7X10-4 | 4.8X10-5 |
| LE-28 | 0.057 | 2.50 | 6.01 | 3.33 | 5.1X10-5 | 5.5X10-5 |
| LE-29 | 0.045 | 2.37 | 6.19 | 3.36 | 3.9X10-4 | 8.1X10-5 |
| LE-30 | 0.244 | 2.45 | 6.09 | 3.35 | 5.6X10-4 | 7.5X10-5 |
| LE-31 | 0.235 | 2.40 | 5.70 | 3.14 | 6.4X10-4 | 6.1X10-5 |
| LE-32 | 0.129 | 2.34 | 5.68 | 2.93 | 7.0X10-4 | 4.2X10-5 |
| LE-33 | 0.342 | 2.55 | 6.21 | 3.23 | 7.5X10-4 | 5.9X10-5 |
| LE-34 | 0.295 | 2.47 | 6.15 | 3.06 | 6.6X10-3 | 9.1X10-5 |
| LE-35 | 0.310 | 2.43 | 6.09 | 3.10 | 8.1X10-4 | 7.9X10-5 |
| LE-36 | 0.265 | 2.39 | 6.18 | 3.23 | 9.5X10-3 | 9.4X10-5 |
| 정공이동도 및 전자이동도는 양극성 화합물을 1㎛ 두께로 성막하여 캐리어의 이동시간(Transit time)을 측정함 | ||||||
| 화합물 | 두께 | |
| 정공주입층 | DS-205(두산社) | 80nm |
| 정공수송층 | NPB | 15nm |
| 발광층 | ADN + 5% DS-405 (두산社) | 30nm |
| 수명개선층 | LE-01 내지 LE-36 | 5nm |
| 전자수송층 | Alq3 | 25nm |
| 전자주입층 | LiF | 1nm |
| 음극 | Al | 200nm |
| 화합물 | 구동전압(V) | 전류효율(cd/A) | 발광 피크(nm) | 수명(hr) | |
| 실시예 1 | LE-01 | 4.5 | 5.9 | 458 | 45 |
| 실시예 2 | LE-02 | 4.7 | 5.6 | 458 | 50 |
| 실시예 3 | LE-03 | 4.5 | 5.9 | 458 | 75 |
| 실시예 4 | LE-04 | 4.2 | 6.0 | 458 | 54 |
| 실시예 5 | LE-05 | 4.1 | 5.7 | 458 | 42 |
| 실시예 6 | LE-06 | 4.3 | 6.1 | 458 | 78 |
| 실시예 7 | LE-07 | 4.2 | 6.0 | 458 | 75 |
| 실시예 8 | LE-08 | 4.7 | 5.7 | 457 | 82 |
| 실시예 9 | LE-09 | 4.4 | 6.1 | 458 | 51 |
| 실시예 10 | LE-10 | 4.1 | 5.7 | 458 | 39 |
| 실시예 11 | LE-11 | 4.9 | 5.4 | 458 | 103 |
| 실시예 12 | LE-12 | 5.0 | 5.3 | 457 | 88 |
| 실시예 13 | LE-13 | 5.0 | 5.5 | 458 | 39 |
| 실시예 14 | LE-14 | 4.9 | 5.6 | 458 | 40 |
| 실시예 15 | LE-15 | 4.2 | 6.1 | 458 | 59 |
| 실시예 16 | LE-16 | 4.6 | 5.7 | 458 | 45 |
| 실시예 17 | LE-17 | 4.5 | 6.1 | 458 | 55 |
| 실시예 18 | LE-18 | 4.3 | 6.5 | 458 | 59 |
| 실시예 19 | LE-19 | 4.4 | 6.4 | 457 | 60 |
| 실시예 20 | LE-20 | 4.7 | 6.0 | 458 | 50 |
| 실시예 21 | LE-21 | 4.5 | 6.2 | 458 | 75 |
| 실시예 22 | LE-22 | 4.2 | 6.6 | 458 | 55 |
| 실시예 23 | LE-23 | 4.1 | 6.6 | 458 | 92 |
| 실시예 24 | LE-24 | 4.4 | 6.2 | 457 | 45 |
| 실시예 25 | LE-25 | 4.3 | 6.1 | 458 | 78 |
| 실시예 26 | LE-26 | 4.1 | 6.2 | 458 | 64 |
| 실시예 27 | LE-27 | 4.2 | 6.0 | 458 | 75 |
| 실시예 28 | LE-28 | 4.7 | 6.4 | 457 | 85 |
| 실시예 29 | LE-29 | 4.3 | 6.0 | 458 | 62 |
| 실시예 30 | LE-30 | 4.5 | 6.3 | 458 | 60 |
| 실시예 31 | LE-31 | 4.6 | 6.2 | 458 | 55 |
| 실시예 32 | LE-32 | 4.5 | 6.4 | 457 | 59 |
| 실시예 33 | LE-33 | 4.4 | 6.3 | 458 | 81 |
| 실시예 34 | LE-34 | 4.5 | 6.3 | 458 | 70 |
| 실시예 35 | LE-35 | 4.5 | 6.3 | 458 | 83 |
| 실시예 36 | LE-36 | 4.5 | 6.2 | 457 | 92 |
| 비교예 1 | - | 4.7 | 5.6 | 458 | 32 |
| 비교예 2 | BCP | 5.3 | 5.9 | 458 | 28 |
| 수명은 수명측정기를 통해 발광휘도가 97% 되는 시간을 측정함 | |||||
| 화합물 | 두께 | |
| 정공주입층 | m-MTDATA | 60nm |
| 정공수송층 | TCTA | 80nm |
| 발광층 | CBP + 10% Ir(ppy)3 | 30nm |
| 수명개선층 | 하기 표 5 참조 | 5nm |
| 전자수송층 | Alq3 | 25nm |
| 전자주입층 | LiF | 1nm |
| 음극 | Al | 200nm |
| 화합물 | 구동전압(V) | 전류효율(cd/A) | 발광피크(nm) | 수명(hr, T97) | |
| 실시예 37 | LE-02 | 7.3 | 37.0 | 516 | 49 |
| 실시예 38 | LE-07 | 7.2 | 36.9 | 516 | 65 |
| 실시예 39 | LE-08 | 7.4 | 37.0 | 517 | 85 |
| 실시예 40 | LE-09 | 7.1 | 37.8 | 516 | 55 |
| 실시예 41 | LE-10 | 7.0 | 35.3 | 515 | 54 |
| 실시예 42 | LE-11 | 7.4 | 36.9 | 516 | 98 |
| 실시예 43 | LE-12 | 7.3 | 37.1 | 516 | 103 |
| 실시예 44 | LE-17 | 7.3 | 37.0 | 516 | 51 |
| 실시예 45 | LE-18 | 7.1 | 38.2 | 516 | 49 |
| 실시예 46 | LE-19 | 7.2 | 36.9 | 516 | 68 |
| 실시예 47 | LE-22 | 7.4 | 37.0 | 517 | 59 |
| 실시예 48 | LE-23 | 7.1 | 40.1 | 516 | 95 |
| 실시예 49 | LE-25 | 7.0 | 35.3 | 515 | 66 |
| 실시예 50 | LE-26 | 7.4 | 36.9 | 516 | 74 |
| 실시예 51 | LE-28 | 6.8 | 39.8 | 516 | 103 |
| 비교예 3 | - | 7.2 | 36.8 | 516 | 45 |
| 비교예 4 | BCP | 7.9 | 40.2 | 516 | 40 |
| 수명은 수명측정기를 통해 발광 휘도가 97% 되는 시간을 측정함 | |||||
Claims (20)
- 양극;음극; 및상기 양극과 음극 사이에, 정공주입층, 정공수송층, 발광층, 전자수송층 및 전자주입층으로 이루어진 군에서 선택되는 유기물층이 1층 이상 설치되어 있고,상기 발광층과 전자수송층 사이에 수명개선층(Lifetime Enhancement Layer, LEL)을 더 포함하는 유기 전계 발광소자로서,상기 수명개선층은 전자흡수성이 큰 전자끌게기(EWG)와 전자공여성이 큰 전자주게기(EDG)를 가지는 양극성(bipolar) 화합물을 포함하되,상기 양극성 화합물은 하기 (a) 내지 (d) 조건을 만족하는 것을 특징으로 하는 유기 전계 발광 소자:(a) 이온화포텐셜[Ip(LEL)]이 5.5eV 이상이고,(b) EHOMO-ELUMO > 2.9 eV,(c) 삼중항 에너지가 2.3eV 이상이며,(d) ΔEst < 0.5eV (ΔEst는 상기 화합물의 일중항 에너지와 삼중항 에너지의 차이를 나타냄)
- 제1항에 있어서,상기 발광층이 청색 형광, 녹색 형광, 또는 적색 인광인 경우, 수명개선층에 포함되는 양극성 화합물의 삼중항 에너지는 2.3eV 이상인 것을 특징으로 하는 유기 전계 발광 소자.
- 제1항에 있어서,상기 발광층이 녹색 인광인 경우, 수명개선층에 포함되는 양극성 화합물의 삼중항 에너지는 2.5eV 이상이고, 이온화 포텐셜이 6.0eV 이상인 것을 특징으로 하는 유기 전계 발광 소자.
- 제1항에 있어서,상기 발광층이 청색 인광인 경우, 수명개선층에 포함되는 양극성 화합물의 삼중항 에너지는 2.7eV 이상이고, 이온화 포텐셜이 6.0eV 이상인 것을 특징으로 하는 유기 전계 발광 소자.
- 제1항에 있어서,상기 수명개선층에 포함되는 양극성 화합물의 전자 이동도 및 정공 이동도는 각각 상온에서 1×10-6 cm2/V·s 이상인 것을 특징으로 하는 유기 전계 발광 소자.
- 제1항에 있어서,상기 양극성 화합물은 하기 화학식으로 표시되는 전자끌게기(EWG) 모이어티를 1개 이상 포함하는 것을 특징으로 하는 유기 전계 발광 소자.상기 식에서,A1 내지 A11은 서로 동일하거나 상이하며, 각각 독립적으로 N 또는 C(R)이되, 적어도 1개는 N이며, C(R)이 복수인 경우 이들은 서로 동일하거나 상이하고,상기 R은 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, 인접한 기와 축합 고리를 형성하고,상기 R의 알킬기, 알케닐기, 알키닐기, 시클로알킬기, 헤테로시클로알킬기, 아릴기, 헤테로아릴기, 알킬옥시기, 아릴옥시기, 알킬실릴기, 아릴실릴기, 알킬보론기, 아릴보론기, 포스핀기, 포스핀옥사이드기 및 아릴아민기는 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~C40의 아릴기, 핵원자수 5 내지 40의 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 이상으로 치환 또는 비치환된다.
- 제1항에 있어서,상기 양극성(bipolar) 화합물은 하기 화학식 1로 표시되는 전자주게기(EDG) 모이어티를 포함하는 것을 특징으로 하는 유기 전계 발광 소자.[화학식 1]상기 화학식 1에서,X1은 O, S, Se, N(Ar1), C(Ar2)(Ar3) 및 Si(Ar4)(Ar5)로 이루어진 군에서 선택되고,Y1 내지 Y4는 서로 동일하거나 상이하며, 각각 독립적으로 N 또는 C(R1)이고, 이때 복수의 R1은 서로 동일하거나 상이하고, 이들은 인접한 기와 축합 고리를 형성할 수 있고,X2 및 X3는 서로 동일하거나 상이하며, 각각 독립적으로 N 또는 C(R2)이고, 이때 복수의 R2는 서로 동일하거나 상이하고, 이들은 인접한 기와 축합 고리를 형성할 수 있고,상기 R1 내지 R2 및 Ar1 내지 Ar5는 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 선택되고,상기 R1 내지 R2 및 Ar1 내지 Ar5의 알킬기, 알케닐기, 알키닐기, 시클로알킬기, 헤테로시클로알킬기, 아릴기, 헤테로아릴기, 알킬옥시기, 아릴옥시기, 알킬실릴기, 아릴실릴기, 알킬보론기, 아릴보론기, 포스핀기, 포스핀옥사이드기 및 아릴아민기는 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~C40의 아릴기, 핵원자수 5 내지 40의 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 이상으로 치환 또는 비치환된다.
- 제1항에 있어서,상기 양극성(bipolar) 화합물은 하기 화학식 1과 하기 화학식 2, 또는 하기 화학식 1과 하기 화학식 3이 서로 결합하여 축합 고리를 형성하는 모이어티를 포함하는 것을 특징으로 하는 유기 전계 발광 소자.[화학식 1]상기 화학식 1에서,X1은 O, S, Se, N(Ar1), C(Ar2)(Ar3) 및 Si(Ar4)(Ar5)로 이루어진 군에서 선택되고,Y1 내지 Y4는 서로 동일하거나 상이하며, 각각 독립적으로 N 또는 C(R1)이고, 이때 Y1과 Y2, Y2와 Y3 또는 Y3와 Y4 중 하나는 하기 화학식 2 또는 화학식 3과 축합 고리를 형성하며(이때 복수의 R1은 서로 동일하거나 상이함),X2 및 X3는 서로 동일하거나 또는 상이하며, 각각 독립적으로 N 또는 C(R2)이고(이때 복수의 R2는 서로 동일하거나 상이함),[화학식 2][화학식 3]상기 화학식 2 및 화학식 3에서,Y5 내지 Y14은 서로 동일하거나 상이하며, 각각 독립적으로 N 또는 C(R3)이고, 이때 복수의 R3는 서로 동일하거나 상이하고, 상기 화학식 1과 축합 고리를 형성할 수 있고,X4는 X1과 동일하고, 이때 복수의 Ar1 내지 Ar5은 서로 동일하거나 상이하며,축합 환을 비(非)형성하는 복수의 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 선택되고,상기 R3의 알킬기, 알케닐기, 알키닐기, 시클로알킬기, 헤테로시클로알킬기, 아릴기, 헤테로아릴기, 알킬옥시기, 아릴옥시기, 알킬실릴기, 아릴실릴기, 알킬보론기, 아릴보론기, 포스핀기, 포스핀옥사이드기 및 아릴아민기는 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~C40의 아릴기, 핵원자수 5 내지 40의 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 이상으로 치환 또는 비치환된다.
- 제1항에 있어서,상기 양극성(bipolar) 화합물은 하기 화학식 4로 표시되는 전자주게기(EDG) 모이어티를 포함하는 것을 특징으로 하는 유기 전계 발광 소자.[화학식 4]상기 화학식 4에서,L1 내지 L3는 서로 동일하거나 상이하며, 각각 독립적으로 단일결합, C6~C60의 아릴렌기 및 핵원자수 5 내지 60의 헤테로아릴렌기로 이루어진 군에서 선택되고,Ar6 내지 Ar8은 서로 동일하거나 상이하며, 각각 독립적으로 수소, 중수소, C6~C40의 아릴기 및 핵원자수 5 내지 40의 헤테로아릴기에서 선택되고, 단 Ar6 내지 Ar8가 모두 동일한 경우는 제외하고,R4 내지 R6은 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 선택되고,a 내지 c는 각각 독립적으로 0 내지 3의 정수이고,상기 L1 내지 L3, R4 내지 R6 및 Ar6 내지 Ar8의 아릴렌기, 헤테로아릴렌기, 알킬기, 알케닐기, 알키닐기, 시클로알킬기, 헤테로시클로알킬기, 아릴기, 헤테로아릴기, 알킬옥시기, 아릴옥시기, 알킬실릴기, 아릴실릴기, 알킬보론기, 아릴보론기, 포스핀기, 포스핀옥사이드기 및 아릴아민기는 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~C40의 아릴기, 핵원자수 5 내지 40의 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 이상으로 치환 또는 비치환된다.
- 제1항에 있어서,상기 전자수송층의 재료와 상기 수명개선층의 재료가 동일한 것을 특징으로 하는 유기 전계 발광 소자.
- 제1항에 있어서,상기 전자주입층의 재료와 상기 수명개선층의 재료가 동일한 것을 특징으로 하는 유기 전계 발광 소자.
- 제1항에 있어서,상기 전자주입층 또는 상기 전자수송층은 알칼리 금속 착물이 공증착되어 구비되는 것을 특징으로 하는 유기 전계 발광 소자.
- 제1항에 있어서,상기 정공수송층과 상기 발광층 사이에 전자와 엑시톤을 블로킹하는 유기막층이 더 구비하는 것을 특징으로 하는 유기 전계 발광 소자.
- 제1항에 있어서,상기 발광층은 호스트 재료와 도펀트 재료를 포함하고, 상기 도펀트를 0.1중량% 내지 30중량% 범위로 포함하는 것을 특징으로 하는 유기 전계 발광 소자.
- 제1항에 있어서,상기 정공수송층과 상기 전자수송층 사이에 복수의 발광층을 순차적으로 적층시켜 전압, 전류 인가시 혼합색을 구현하는 것을 특징으로 하는 유기 전계 발광 소자.
- 제1항에 있어서,상기 정공수송층과 상기 전자수송층 사이에 단일 재료의 발광층을 복수로 적층하거나, 이종 재료의 복수의 발광층을 직렬로 구비하여 전압, 전류 인가시 혼합색을 구현하거나 효율을 증가시키는 것을 특징으로 하는 유기 전계 발광 소자.
- 제1항에 있어서,전압, 전류 또는 이들 모두를 인가하는 경우, 최대 발광효율은 유지하면서 초기 밝기의 반감시간(Lifetime)이 증가하는 것을 특징으로 하는 유기 전계 발광 소자.
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| Application Number | Priority Date | Filing Date | Title |
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| US15/107,971 US10573822B2 (en) | 2013-12-27 | 2014-12-26 | Organic electroluminescent device |
| JP2016543059A JP6759099B2 (ja) | 2013-12-27 | 2014-12-26 | 有機電界発光素子 |
| CN201480071035.2A CN105849227B (zh) | 2013-12-27 | 2014-12-26 | 有机电致发光元件 |
| US16/742,060 US11588109B2 (en) | 2013-12-27 | 2020-01-14 | Organic electroluminescent device |
| US17/589,017 US20220336753A1 (en) | 2013-12-27 | 2022-01-31 | Organic electroluminescent device |
| US17/953,510 US12441935B2 (en) | 2013-12-27 | 2022-09-27 | Organic electroluminescent device |
| US18/741,291 US20260047340A1 (en) | 2013-12-27 | 2024-06-12 | Organic electroluminescent device |
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| KR10-2013-0166103 | 2013-12-27 | ||
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| KR10-2014-0158154 | 2014-11-13 | ||
| KR1020140158154A KR101742359B1 (ko) | 2013-12-27 | 2014-11-13 | 유기 전계 발광 소자 |
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| US15/107,971 A-371-Of-International US10573822B2 (en) | 2013-12-27 | 2014-12-26 | Organic electroluminescent device |
| US16/742,060 Continuation US11588109B2 (en) | 2013-12-27 | 2020-01-14 | Organic electroluminescent device |
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| WO2015099481A1 true WO2015099481A1 (ko) | 2015-07-02 |
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| PCT/KR2014/012888 Ceased WO2015099481A1 (ko) | 2013-12-27 | 2014-12-26 | 유기 전계 발광 소자 |
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| WO (1) | WO2015099481A1 (ko) |
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