Patent Application
20210070706
A composition, an organic optoelectronic device, and a display device are disclosed.
An organic optoelectronic device (organic optoelectronic diode) is a device that converts electrical energy into photoenergy, and vice versa.
An organic optoelectronic device may be classified as follows in accordance with its driving principles. One is a photoelectric device where excitons generated by photoenergy are separated into electrons and holes and the electrons and holes are transferred to different electrodes respectively and electrical energy is generated, and the other is a light emitting device to generate photoenergy from electrical energy by supplying a voltage or a current to electrodes.
Examples of the organic optoelectronic device include an organic photoelectric device, an organic light emitting diode, an organic solar cell, and an organic photo conductor drum.
Of these, an organic light emitting diode (OLED) has recently drawn attention due to an increase in demand for flat panel displays. The organic light emitting diode converts electrical energy into light by applying current to an organic light emitting material and performance of an organic light emitting diode may be affected by organic materials disposed between electrodes.
An embodiment provides a composition capable of realizing high efficiency and long life-span organic optoelectronic device.
Another embodiment provides an organic optoelectronic device including the composition.
Another embodiment provides a display device including the organic optoelectronic device.
According to an embodiment, a composition includes a first compound represented by a combination of Chemical Formula 1 and Chemical Formula 2, and a second compound represented by Chemical Formula 3.
In Chemical Formula 1 and Chemical Formula 2,
Ar is a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heterocyclic group, or a combination thereof,
adjacent two of a1* to a4* are linked with b1* and b2* respectively,
the remainders of a1* to a4* not linked with b1* and b2* are independently C-La-Ra,
La and L1 to L4 are independently a single bond, a substituted or unsubstituted C6 to C20 arylene group, a substituted or unsubstituted C2 to C20 heterocyclic group, or a combination thereof,
Ra and R1 to R4 are independently hydrogen, deuterium, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heterocyclic group, or a combination thereof, and
at least one of Ra and R1 to R4 is a group represented by Chemical Formula A,
wherein, in Chemical Formula A,
Rb and Rc are independently a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heterocyclic group, or a combination thereof, and
* is a linking point with La and L1 to L4;
wherein, in Chemical Formula 3,
Z1 to Z3 are independently N or CRd,
at least two of Z1 to Z3 are N,
Y1 and Y2 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heterocyclic group, a halogen, a cyano group, or a combination thereof,
L5 is a single bond or a substituted or unsubstituted C6 to C20 arylene group, and
R5 to R9 and Rd are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, halogen, a cyano group or a combination thereof.
According to another embodiment, an organic optoelectronic device includes an anode and a cathode facing each other, and at least one organic layer disposed between the anode and the cathode, wherein the organic layer includes the aforementioned composition.
According to another embodiment, a display device including the organic optoelectronic device is provided.
An organic optoelectronic device having high efficiency and a long life-span may be realized.
Hereinafter, embodiments of the present invention are described in detail. However, these embodiments are exemplary, the present invention is not limited thereto and the present invention is defined by the scope of claims.
In the present specification, when a definition is not otherwise provided, “substituted” refers to replacement of at least one hydrogen of a substituent or a compound by deuterium, a halogen, a hydroxyl group, an amino group, a substituted or unsubstituted C1 to C30 amine group, a nitro group, a substituted or unsubstituted C1 to C40 silyl group, a C1 to C30 alkyl group, a C1 to C10 alkylsilyl group, a C6 to C30 arylsilyl group, a C3 to C30 cycloalkyl group, a C3 to C30 heterocycloalkyl group, a C6 to C30 aryl group, a C2 to C30 heteroaryl group, a C1 to C20 alkoxy group, a C1 to C10 trifluoroalkyl group, a cyano group, or a combination thereof.
In one example of the present invention, “substituted” refers to replacement of at least one hydrogen of a substituent or a compound by deuterium, a C1 to C30 alkyl group, a C1 to C10 alkylsilyl group, a C6 to C30 arylsilyl group, a C3 to C30 cycloalkyl group, a C3 to C30 heterocycloalkyl group, a C6 to C30 aryl group, or a C2 to C30 heteroaryl group. In addition, in specific examples of the present invention, “substituted” refers to replacement of at least one hydrogen of a substituent or a compound by deuterium, a C1 to C20 alkyl group, a C6 to C30 aryl group, or a C2 to C30 heteroaryl group. In addition, in specific examples of the present invention, “substituted” refers to replacement of at least one hydrogen of a substituent or a compound by deuterium, a C1 to C5 alkyl group, a C6 to C18 aryl group, a pyridinyl group, a quinolinyl group, an isoquinolinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, or a carbazolyl group. In addition, in specific examples of the present invention, “substituted” refers to replacement of at least one hydrogen of a substituent or a compound by deuterium, a C1 to C5 alkyl group, a C6 to C18 aryl group, a dibenzofuranyl group, or a dibenzothiophenyl group. In addition, in specific examples of the present invention, “substituted” refers to replacement of at least one hydrogen of a substituent or a compound by deuterium, a methyl group, an ethyl group, a propyl group, a butyl group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a triphenylene group, a dibenzofuranyl group, or a dibenzothiophenyl group.
In the present specification, when a definition is not otherwise provided, “hetero” refers to one including one to three heteroatoms selected from N, O, S, P, and Si, and remaining carbons in one functional group.
In the present specification, “aryl group” refers to a group including at least one hydrocarbon aromatic moiety, and may include a group in which all elements of the hydrocarbon aromatic moiety have p-orbitals which form conjugation, for example a phenyl group, a naphthyl group, and the like, a group in which two or more hydrocarbon aromatic moieties may be linked by a sigma bond, for example a biphenyl group, a terphenyl group, a quarterphenyl group, and the like, and a group in which two or more hydrocarbon aromatic moieties are fused directly or indirectly to provide a non-aromatic fused ring, for example a fluorenyl group, and the like.
The aryl group may include a monocyclic, polycyclic or fused ring polycyclic (i.e., rings sharing adjacent pairs of carbon atoms) functional group.
In the present specification, “heterocyclic group” is a generic concept of a heteroaryl group, and may include at least one heteroatom selected from N, O, S, P, and Si instead of carbon (C) in a cyclic compound such as an aryl group, a cycloalkyl group, a fused ring thereof, or a combination thereof. When the heterocyclic group is a fused ring, the entire ring or each ring of the heterocyclic group may include one or more heteroatoms.
For example, “heteroaryl group” refers to an aryl group including at least one heteroatom selected from N, O, S, P, and Si. Two or more heteroaryl groups are linked by a sigma bond directly, or when the heteroaryl group includes two or more rings, the two or more rings may be fused. When the heteroaryl group is a fused ring, each ring may include one to three heteroatoms.
More specifically, the substituted or unsubstituted C6 to C30 aryl group may be a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthracenyl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted naphthacenyl group, a substituted or unsubstituted pyrenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted p-terphenyl group, a substituted or unsubstituted m-terphenyl group, a substituted or unsubstituted o-terphenyl group, a substituted or unsubstituted chrysenyl group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted perylenyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted indenyl group, or a combination thereof, but is not limited thereto.
More specifically, the substituted or unsubstituted C2 to C30 heterocyclic group may be a substituted or unsubstituted furanyl group, a substituted or unsubstituted thiophenyl group, a substituted or unsubstituted pyrrolyl group, a substituted or unsubstituted pyrazolyl group, a substituted or unsubstituted imidazolyl group, a substituted or unsubstituted triazolyl group, a substituted or unsubstituted oxazolyl group, a substituted or unsubstituted thiazolyl group, a substituted or unsubstituted oxadiazolyl group, a substituted or unsubstituted thiadiazolyl group, a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted pyrazinyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted benzofuranyl group, a substituted or unsubstituted benzothiophenyl group, a substituted or unsubstituted benzimidazolyl group, a substituted or unsubstituted indolyl group, a substituted or unsubstituted quinolinyl group, a substituted or unsubstituted isoquinolinyl group, a substituted or unsubstituted quinazolinyl group, a substituted or unsubstituted quinoxalinyl group, a substituted or unsubstituted naphthyridinyl group, a substituted or unsubstituted benzoxazinyl group, a substituted or unsubstituted benzthiazinyl group, a substituted or unsubstituted acridinyl group, a substituted or unsubstituted phenazinyl group, a substituted or unsubstituted phenothiazinyl group, a substituted or unsubstituted phenoxazinyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group, or a combination thereof, but is not limited thereto.
In the present specification, hole characteristics refer to an ability to donate an electron to form a hole when an electric field is applied and that a hole formed in the anode may be easily injected into the light emitting layer and transported in the light emitting layer due to conductive characteristics according to the highest occupied molecular orbital (HOMO) level.
In addition, electron characteristics refer to an ability to accept an electron when an electric field is applied and that electron formed in the cathode may be easily injected into the light emitting layer and transported in the light emitting layer due to conductive characteristics according to the lowest unoccupied molecular orbital (LUMO) level.
Hereinafter, a composition for an organic optoelectronic device according to an embodiment is described.
The composition for an organic optoelectronic device according to an embodiment includes a first compound having hole characteristics and a second compound having electron characteristics.
The first compound is represented by a combination of Chemical Formula 1 and Chemical Formula 2.
In Chemical Formula 1 and Chemical Formula 2,
Ar is a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heterocyclic group, or a combination thereof,
adjacent two of a1* to a4* are linked with b1* and b2* respectively,
the remainders of a1* to a4* not linked with b1* and b2* are independently C-La-Ra,
La and L1 to L4 are independently a single bond, a substituted or unsubstituted C6 to C20 arylene group, a substituted or unsubstituted C2 to C20 heterocyclic group, or a combination thereof,
Ra and R1 to R4 are independently hydrogen, deuterium, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heterocyclic group, or a combination thereof, and
at least one of Ra and R1 to R4 is a group represented by Chemical Formula A,
wherein, in Chemical Formula A,
Rb and Rc are independently a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heterocyclic group, or a combination thereof, and
* is a linking point with La and L1 to L4.
The first compound has a structure in which benzocarbazole is substituted with amine, thereby expanding a HOMO electron cloud from amine to benzocarbazole and thus has high HOMO energy, and excellent hole injection and transport characteristics.
In addition, since the benzocarbazole has a relatively high HOMO energy compared with bicarbazole and indolocarbazole, it is possible to implement a device having a low driving voltage by applying the structure of amine-substituted benzocarbazole.
In addition, bicarbazole and indolocarbazole have a high T1 energy, and thus are not suitable as a red host, whereas the structure of amine-substituted benzocarbazole has a T1 energy suitable as a red host. Accordingly, the device to which the compound according to the present invention is applied may have high efficiency/life-span characteristics.
On the other hand, it may be included with the second compound to balance holes and electrons, thereby lowering a driving voltage of a device including them.
For example, Rb and Rc may independently be a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted anthracenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group.
For example, Rb and Rc may independently be a substituted or unsubstituted, phenyl group, a substituted or unsubstituted p-biphenyl group, or a substituted or unsubstituted fluorenyl group, wherein a substituent may be a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a triphenylene group, a carbazolyl group, a dibenzofuranyl group, or a dibenzothiophenyl group.
For example, Ar may independently be a substituted or unsubstituted C6 to C20 aryl group, or a substituted or unsubstituted C2 to C20 heterocyclic group.
For example, Ar may be a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthracenyl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted carbazolyl group, or a combination thereof.
For example, Ar may be a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, or a substituted or unsubstituted carbazolyl group, but is not limited thereto.
For example, La and L1 to L4 may independently be a single bond or a substituted or unsubstituted C6 to C20 arylene group.
For example, La and L1 to L4 may independently be a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted terphenylene group, or a substituted or unsubstituted naphthylene group.
For example, La and L1 to L4 may independently be a single bond, a substituted or unsubstituted m-phenylene group, a substituted or unsubstituted p-phenylene group, a substituted or unsubstituted o-phenylene group, a substituted or unsubstituted m-biphenylene group, a substituted or unsubstituted p-biphenylene group, a substituted or unsubstituted o-biphenylene group, a substituted or unsubstituted m-terphenylene group, a substituted or unsubstituted p-terphenylene group, or a substituted or unsubstituted o-terphenylene group. Herein, “substituted” may for example refer to replacement of at least one hydrogen by deuterium, a C1 to C20 alkyl group, a C6 to C20 aryl group, a halogen, a cyano group, or a combination thereof.
For example, Ra and R1 to R4 may independently be hydrogen, deuterium, a cyano group, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, a substituted or unsubstituted C2 to C20 heterocyclic group, or the group represented by Chemical Formula A.
For example, Ra and R1 to R4 may independently be hydrogen or the group represented by Chemical Formula A, but is not limited thereto.
For example, the first compound may be represented by one of Chemical Formula 1A to Chemical Formula 1C, depending on a fusion position of Chemical Formula 1 and Chemical Formula 2.
In Chemical Formula 1A to Chemical Formula 1C, Ar, La, and L1 to L4, and Ra and R1 to R4 are the same as described above.
For example, Chemical Formula 1A may be represented by one of Chemical Formula 1A-1 to Chemical Formula 1A-3, depending on a substitution position of the group represented by Chemical Formula A.
In Chemical Formula 1A-1 to Chemical Formula 1A-3, Ar, La and L1 to L4, Ra and R1 to R4, and Rb and Rc are the same as described above.
For example, Chemical Formula 1A-1 may be represented by one of Chemical Formula 1A-1-a to Chemical Formula 1A-1-d, depending on a specific substitution position of the group represented by Chemical Formula A.
In Chemical Formula 1A-1-a to Chemical Formula 1A-1-d, Ar, La and L1 to L4, Ra and R1 to R4, and Rb and Rc are the same as described above.
In an embodiment, Chemical Formula 1A-1 may be represented by Chemical Formula 1A-1-b or Chemical Formula 1A-1-c.
For example, Chemical Formula 1A-2 may be represented by one of Chemical Formula 1A-2-a or Chemical Formula 1A-2-b, depending on a specific substitution position of the group represented by Chemical Formula A.
In Chemical Formula 1A-2-a and Chemical Formula 1A-2-b, Ar, La and L1 to L4 and R1 to R4, and Rb and Rc are the same as described above.
In an embodiment, Chemical Formula 1A-2 may be represented by Chemical Formula 1A-2-a.
For example, Chemical Formula 1A-3 may be represented by one of Chemical Formula 1A-3-a to Chemical Formula 1A-3-d, depending on a specific substitution position of the group represented by Chemical Formula A.
In Chemical Formula 1A-3-a to Chemical Formula 1A-3-d, Ar, La and L1 to L4, Ra and R1 to R4, and Rb and Rc are the same as described above.
In an embodiment, Chemical Formula 1A-3 may be represented by Chemical Formula 1A-3-b or Chemical Formula 1A-3-c.
For example, Chemical Formula 1B may be represented by one of Chemical Formula 1B-1 to Chemical Formula 1B-3, depending on a specific substitution position of the group represented by Chemical Formula A.
In Chemical Formula 1B-1 to Chemical Formula 1B-3, Ar, La and L1 to L4, Ra and R1 to R4, and Rb and Rc are the same as described above.
For example, Chemical Formula 1B-1 may be represented by one of Chemical Formula 1B-1-a to Chemical Formula 1B-1-d, depending on a specific substitution position of the group represented by Chemical Formula A.
In Chemical Formula 1B-1-a to Chemical Formula 1B-1-d, Ar, La and L1 to L4, Ra and R1 to R4, and Rb and Rc are the same as described above.
For example, Chemical Formula 1B-2 may be represented by one of Chemical Formula 1B-2-a or Chemical Formula 1B-2-b, depending on a specific substitution position of the group represented by Chemical Formula A.
In Chemical Formula 1B-2-a and Chemical Formula 1B-2-b, Ar, La and L1 to L4, R1 to R4, and Rb and Rc are the same as described above.
For example, Chemical Formula 1B-3 may be represented by one of Chemical Formula 1B-3-a to Chemical Formula 1B-3-d, depending on a specific substitution position of the group represented by Chemical Formula A.
In Chemical Formula 1B-3-a to Chemical Formula 1B-3-d, Ar, La and L1 to L4, Ra and R1 to R4, and Rb and Rc are the same as described above.
In an embodiment, Chemical Formula 1B-3 may be represented by Chemical Formula 1B-3-b.
For example, Chemical Formula 1C may be represented by one of Chemical Formula 1C-1 to Chemical Formula 1C-3, depending on a substitution position of the group represented by Chemical Formula A.
In Chemical Formula 1C-1 to Chemical Formula 1C-3, Ar, La and L1 to L4, Ra and R1 to R4, and Rb and Rc are the same as described above.
For example, Chemical Formula 1C-1 may be represented by one of Chemical Formula 1C-1-a to Chemical Formula 1C-1-d, depending on a specific substitution position of the group represented by Chemical Formula A.
In Chemical Formula 1C-1-a to Chemical Formula 1C-1-d, Ar, La and L1 to L4, Ra and R1 to R4, and Rb and Rc are the same as described above.
In an embodiment, Chemical Formula 1C-1 may be represented by Chemical Formula 1C-1-b.
For example, Chemical Formula 1C-2 may be represented by one of Chemical Formula 1C-2-a or Chemical Formula 1C-2-b, depending on a specific substitution position of the group represented by Chemical Formula A.
In Chemical Formula 1C-2-a and Chemical Formula 1C-2-b, Ar, La and L1 to L4, R1 to R4, and Rb and Rc are the same as described above.
For example, Chemical Formula 1C-3 may be represented by one of Chemical Formula 1C-3-a to Chemical Formula 1C-3-d, depending on a specific substitution position of the group represented by Chemical Formula A.
In Chemical Formula 1C-3-a to Chemical Formula 1C-3-d, Ar, La and L1 to L4, Ra and R1 to R4, and Rb and Rc are the same as described above.
In an embodiment, Chemical Formula 1C-3 may be represented by Chemical Formula 1C-3-b.
In one specific embodiment of the present invention, the first compound may be represented by Chemical Formula 1A, specifically, represented by Chemical Formula 1A-1, for example, represented by Chemical Formula 1A-1-b.
The first compound may be, for example, one selected from compounds of Group 1 below, but is not limited thereto.
The second compound is represented by Chemical Formula 3.
In Chemical Formula 3,
Z1 to Z3 are independently N or CRd,
at least two of Z1 to Z3 are N,
Y1 and Y2 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heterocyclic group, a halogen, a cyano group, or a combination thereof,
L5 is a single bond or a substituted or unsubstituted C6 to C20 arylene group, and
R5 to R9 and Rd are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, halogen, a cyano group or a combination thereof.
The second compound is a compound capable of accepting electrons, when an electric field is applied, that is a compound having electron characteristics and specifically has a structure in which a triphenylene ring is linked with a nitrogen-containing ring, that is a pyrimidine or triazine ring to easily accept electrons when an electric field is applied, and thus a driving voltage of an organic optoelectronic device including the second compound for may be lowered.
For example, two of Z1 to Z3 may be nitrogen (N) and the remaining one may be CRd.
For example, Z1 and Z2 may be nitrogen and Z3 may be CRd.
For example, Z2 and Z3 may be nitrogen and Z1 may be CRd.
For example, Z1 and Z3 may be nitrogen and Z2 may be CRd.
For example, Z1 to Z3 may independently be nitrogen (N).
For example, Y1 and Y2 may independently be hydrogen, deuterium, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted pyridinyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, or a combination thereof.
For example, Y1 and Y2 may independently be a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted triphenylenyl group, a substituted or unsubstituted pyridinyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group. Herein, “substituted” may for example refer to replacement of at least one hydrogen by deuterium, a C1 to C20 alkyl group, a C6 to C20 aryl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a halogen, a cyano group, or a combination thereof, but is not limited thereto.
For example, L5 may be a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, or a substituted or unsubstituted terphenylene group.
For example, L5 may be a single bond, a substituted or unsubstituted m-phenylene group, a substituted or unsubstituted p-phenylene group, a substituted or unsubstituted o-phenylene group, a substituted or unsubstituted m-biphenylene group, a substituted or unsubstituted p-biphenylene group, a substituted or unsubstituted o-biphenylene group, a substituted or unsubstituted m-terphenylene group, a substituted or unsubstituted p-terphenylene group, or a substituted or unsubstituted o-terphenylene group. Herein, “substituted” may for example refer to replacement of at least one hydrogen by deuterium, a C1 to C20 alkyl group, a C6 to C20 aryl group, a halogen, a cyano group, or a combination thereof, but is not limited thereto.
For example, L5 may be a single bond, a phenylene group, a biphenylene group, a terphenylene group, a phenylene group substituted with a phenyl group or a cyano group, a biphenylene group substituted with a phenyl group or a cyano group, or a terphenylene group substituted with a phenyl group or a cyano group.
In an embodiment of the present invention, L5 may be a single bond or one of linking groups of Group I, but is not limited thereto.
In addition, in an embodiment of the present invention,
of Chemical Formula 3 may be one of substituents of Group II, but is not limited thereto.
For example, the second compound may be represented by Chemical Formula 3A or Chemical Formula 3B according to a linking position of the triphenylene ring with the pyrimidine or triazine ring.
In Chemical Formula 3A and Chemical Formula 3B, Z1 to Z3, Y1, Y2, L5, R5 to R9 are the same as described above.
For example, the second compound may be represented by Chemical Formula 3A, and in an embodiment of the present invention, the second compound may be represented by Chemical Formula 3A-1.
In Chemical Formula 3A-1, Y1 and Y2, L5, and R5 to R9 are the same as described above. The second compound may be for example one of compounds of Group 2, but is not limited thereto.
The first compound and the second compound may be for example included in a weight ratio of 1:99 to 99:1. Within the range, a desirable weight ratio may be adjusted using a hole transport capability of the first compound and an electron transport capability of the second compound to realize bipolar characteristics and thus to improve efficiency and life-span. Within the range, they may be for example included in a weight ratio of about 10:90 to 90:10, about 20:80 to 80:20, about 30:70 to 70:30, about 40:60 to 60:40 or about 50:50. For example, they may be included in a weight ratio of 50:50 to 60:40, for example, 50:50 or 60:40.
For example, the composition according to an embodiment of the present invention may include the compound represented by Chemical Formula 1A-1-b as the first compound, and the compound represented by Chemical Formula 3A-1 as the second compound.
For example, in Chemical Formula 1A-1-b, Ar may be a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthracenyl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted carbazolyl group, or a combination thereof, La and L1 to L4 may independently be a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted terphenylene group, or a substituted or unsubstituted naphthylene group, Ra, R1, R2, and R4 may independently be hydrogen, deuterium, a cyano group, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heterocyclic group, or a combination thereof, and Rb and Rc may independently be a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted anthracenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group, and
in Chemical Formula 3A-1, Y1 and Y2 may independently be a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, L5 may be a single bond or a phenylene group, and R5 to R9 may independently be hydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C12 aryl group, a cyano group, or a combination thereof.
The composition may further include at least one compound in addition to the aforementioned first compound and second compound.
The composition may further include a dopant. The dopant may be for example a phosphorescent dopant, may be for example a red, green, or blue phosphorescent dopant, and may be for example a red phosphorescent dopant.
The dopant is mixed with the first compound and the second compound in a small amount to cause light emission, and may be generally a material such as a metal complex that emits light by multiple excitation into a triplet or more. The dopant may be, for example an inorganic, organic, or organic/inorganic compound, and one or more types thereof may be used.
Examples of the dopant may be a phosphorescent dopant and examples of the phosphorescent dopant may be an organometal compound including Ir, Pt, Os, Ti, Zr, Hf, Eu, Tb, Tm, Fe, Co, Ni, Ru, Rh, Pd, or a combination thereof. The phosphorescent dopant may be for example a compound represented by Chemical Formula Z, but is not limited thereto.
L6MX [Chemical Formula Z]
In Chemical Formula Z, M is a metal, L6 and X are the same or different, and are a ligand to form a complex compound with M.
The M may be, for example Ir, Pt, Os, Ti, Zr, Hf, Eu, Tb, Tm, Fe, Co, Ni, Ru, Rh, Pd, or a combination thereof and the L6 and X may be, for example a bidendate ligand.
The composition may be formed into a film using a dry film-forming method such as chemical vapor deposition.
Hereinafter, an organic optoelectronic device including the aforementioned composition is described.
The organic optoelectronic device may be any device to convert electrical energy into photoenergy and vice versa without particular limitation, and may be, for example an organic photoelectric device, an organic light emitting diode, an organic solar cell, and an organic photo-conductor drum.
Herein, an organic light emitting diode as one example of an organic optoelectronic device is described referring to drawings.
Referring to
The anode 120 may be made of a conductor having a large work function to help hole injection, and may be for example a metal, a metal oxide and/or a conductive polymer. The anode 120 may be, for example a metal such as nickel, platinum, vanadium, chromium, copper, zinc, gold, and the like or an alloy thereof; a metal oxide such as zinc oxide, indium oxide, indium tin oxide (ITO), indium zinc oxide (IZO), and the like; a combination of a metal and an oxide such as ZnO and Al or SnO2 and Sb; a conductive polymer such as poly(3-methylthiophene), poly(3,4-(ethylene-1,2-dioxy)thiophene) (PEDT), polypyrrole, and polyaniline, but is not limited thereto.
The cathode 110 may be made of a conductor having a small work function to help electron injection, and may be for example a metal, a metal oxide and/or a conductive polymer. The cathode 110 may be for example a metal such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum silver, tin, lead, cesium, barium, and the like, or an alloy thereof; a multi-layer structure material such as LiF/Al, LiO2/Al, LiF/Ca, LiF/Al, and BaF2/Ca, but is not limited thereto.
The organic layer 105 may include a light emitting layer 130 including the aforementioned composition.
The light emitting layer 130 may include the aforementioned composition,
The aforementioned composition may be for example a red light emitting composition.
The light emitting layer 130 may include for example the aforementioned first compound and second compound as a phosphorescent host, respectively.
Referring to
The hole auxiliary layer 140 may include for example at least one of compounds of Group D.
Specifically, the hole auxiliary layer 140 may include a hole transport layer between the anode 120 and the light emitting layer 130 and a hole transport auxiliary layer between the light emitting layer 130 and the hole transport layer, and at least one of compounds of Group D may be included in the hole transport auxiliary layer.
In the hole transport auxiliary layer, known compounds disclosed in U.S. Pat. No. 5,061,569A, JP1993-009471A, WO1995-009147A1, JP1995-126615A, JP1998-095973A, and the like and compounds similar thereto may be used in addition to the aforementioned compounds.
In an embodiment, in
The organic light emitting diodes 100 and 200 may be manufactured by forming an anode or a cathode on a substrate, forming an organic layer using a dry film formation method such as a vacuum deposition method (evaporation), sputtering, plasma plating, and ion plating, and forming a cathode or an anode thereon.
The organic light emitting diode may be applied to an organic light emitting display device.
Hereinafter, the embodiments are illustrated in more detail with reference to examples. However, these examples are exemplary, and the present scope is not limited thereto.
a) Synthesis of Intermediate A-2-1
Phenylhydrazinehydrochloride (70.0 g, 484.1 mmol) and 7-bromo-3,4-dihydro-2H-naphthalen-1-one (108.9 g, 484.1 mmol) were put in a round-bottomed flask and then, dissolved in ethanol (1200 ml). Subsequently, 60 mL of hydrochloric acid was slowly added thereto in a dropwise fashion at room temperature and then, stirred at 90° C. for 12 hours. When a reaction was complete, the solvent was removed therefrom under a reduced pressure, and an excessive amount of EA was used for extraction. After removing the EA under a reduced pressure, the residue was stirred in a small amount of methanol and then, filtered to obtain 95.2 g (66%) of Intermediate A-2-1.
b) Synthesis of Intermediate A-2-2
Intermediate A-2-1 (95.2 g, 319.3 mmol) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (108.7 g, 478.9 mmol) were put in a round-bottomed flask and then, dissolved in 600 ml of toluene. The solution was stirred at 80° C. for 12 hours. When a reaction was complete, after removing the reaction solvent, the resultant was treated through column chromatography to obtain 41.3 g (44%) of Intermediate A-2-2.
c) Synthesis of Intermediate A-2-3
Intermediate A-2-2 (41.3 g, 139.0 mmol), iodobenzene (199.2 g, 976.0 mmol), CuI (5.31 g, 28.0 mmol), K2CO3 (28.9 g, 209.0 mmol), and 1,10-phenanthroline (5.03 g, 28.0 mmol) were put in a round-bottomed flask and then, dissolved in 500 ml of DMF. The solution was stirred at 180° C. for 12 hours. When a reaction was complete, after removing the reaction solvent under a reduced pressure, the resultant was dissolved in dichloromethane and then, silica gel-filtered. After concentrating the dichloromethane, hexane was used for recrystallization to obtain 39.0 g (75%) of Intermediate A-2-3.
d) Synthesis of Compound A-2
Intermediate A-2-3 (23.2 g, 62.5 mmol), bis-biphenyl-4-yl-amine (21.1 g, 65.6 mmol), sodium t-butoxide (NaOtBu) (9.0 g, 93.8 mmol), Pd2(dba)3 (3.4 g, 3.7 mmol), and tri t-butylphosphine (P(tBu)3) (4.5 g, 50% in toluene) were added to xylene (300 mL) and then, heated and refluxed under a nitrogen flow for 12 hours. After removing the xylene, 200 mL of methanol was added to the obtained mixture, a solid crystallized therein was filtered, dissolved in toluene, and filtered with silica gel/Celite, and then, the organic solvent was concentrated in an appropriate amount to obtain 29 g (76%) of Compound A-2.
LC/MS calculated for: C46H32N2 Exact Mass: 612.26 found for 612.32 [M+H]
a) Synthesis of Intermediate A-3-1
Phenylhydrazinehydrochloride and 6-bromo-3,4-dihydro-2H-naphthalen-1-one were respectively used by 1.0 equivalent according to the same method as the a) of Synthesis Example 1 to synthesize Intermediate A-3-1.
b) Synthesis of Intermediate A-3-2
Intermediate A-3-2 was synthesized according to the same method as the b) of Synthesis Example 1 except that Intermediate A-3-1 and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone were used in an equivalent ratio of 1:1.5.
c) Synthesis of Intermediate A-3-3
Intermediate A-3-3 was synthesized according to the same method as the c) of Synthesis Example 1 except that Intermediate A-3-2 and iodobenzene were used in in an equivalent ratio of 1:3.
d) Synthesis of Compound A-3
Compound A-3 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate A-3-3 and bis-biphenyl-4-yl-amine were used in in an equivalent ratio of 1:1.
LC/MS calculated for: C46H32N2 Exact Mass: 612.26 found for 612.28 [M+H]
a) Synthesis of Intermediate A-5-1
Intermediate A-5-1 was synthesized according to the same method as the a) of Synthesis Example 1 except that phenylhydrazinehydrochloride and 3,4-dihydro-2H-naphthalen-1-one were respectively used by 1.0 equivalent.
b) Synthesis of Intermediate A-5-2
Intermediate A-5-2 was synthesized according to the same method as the b) of Synthesis Example 1 except that Intermediate A-5-1 and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone were used in an equivalent ratio of 1:1.5.
c) Synthesis of Intermediate A-5-3
Intermediate A-5-3 was synthesized according to the same method as the c) of Synthesis Example 1 except that Intermediate A-5-2 and iodobenzene were used in an equivalent ratio of 1:3.
d) Synthesis of Intermediate A-5-4
Intermediate A-5-3 (23.6 g, 80.6 mmol) was put in a round-bottomed flask and then, dissolved in 300 mL of dichloromethane. N-bromosuccinimide (NBS) (14.1 g, 79.0 mmol) was dissolved in 100 mL of DMF and slowly added to the above solution in a dropwise fashion, and then, the obtained mixture was stirred at room temperature for 2 hours. When a reaction was complete, after removing the reaction solvent, the residue was treated through column chromatography to obtain 25 g (83%) of Intermediate A-5-4.
e) Synthesis of Compound A-5
Compound A-5 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate A-5-4 and bis-biphenyl-4-yl-amine were used in an equivalent ratio of 1:1.
LC/MS calculated for: C46H32N2 Exact Mass: 612.26 found for 612.33 [M+H]
a) Synthesis of Intermediate A-7-1
Intermediate A-7-1 was synthesized according to the same method as the a) of Synthesis Example 1 except that 4-bromophenylhydrazinehydrochloride and 3,4-dihydro-2H-naphthalen-1-one were respectively used by 1.0 equivalent.
b) Synthesis of Intermediate A-7-2
Intermediate A-7-2 was synthesized according to the same method as the b) of Synthesis Example 1 except that Intermediate A-7-1 and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone were used in an equivalent ratio of 1:1.5.
c) Synthesis of Intermediate A-7-3
Intermediate A-7-3 was synthesized according to the same method as the c) of Synthesis Example 1 except that Intermediate A-7-2 and iodobenzene were used in an equivalent ratio of 1:3.
d) Synthesis of Compound A-7
Compound A-7 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate A-7-3 and ibis-biphenyl-4-yl-amine were used in an equivalent ratio of 1:1.
LC/MS calculated for: C46H32N2 Exact Mass: 612.26 found for 612.30 [M+H]
a) Synthesis of Intermediate A-8-1
Intermediate A-8-1 was synthesized according to the same method as the a) of Synthesis Example 1 except that 3-bromophenylhydrazinehydrochloride, 3,4-dihydro-2H-naphthalen-1-one were respectively used by 1.0 equivalent.
b) Synthesis of Intermediate A-8-2
Intermediate A-8-2 was synthesized according to the same method as the b) of Synthesis Example 1 except that Intermediate A-8-1 and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone were used in an equivalent ratio of 1:1.5.
c) Synthesis of Intermediate A-8-3
Intermediate A-8-3 was synthesized according to the same method as the c) of Synthesis Example 1 except that Intermediate A-8-2 and iodobenzene were used in an equivalent ratio of 1:3.
d) Synthesis of Compound A-8
Compound A-8 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate A-8-3 and bis-biphenyl-4-yl-amine were used in an equivalent ratio of 1:1.
LC/MS calculated for: C46H32N2 Exact Mass: 612.26 found for 612.33 [M+H]
a) Synthesis of Intermediate A-11-1
4-bromo-phenylamine (50.0 g, 290.7 mmol), 2-naphthalene boronic acid (59.9 g, 171.9 mmol), K2CO3 (80.4 g, 581.3 mmol), and Pd(PPh3)4 (10.1 g, 8.7 mmol) were put in a round-bottomed flask and dissolved in 800 ml of toluene and 400 ml of distilled water and then, stirred at 80° C. for 12 hours. When a reaction was complete, after removing an aqueous layer, the residue was treated through column chromatography to obtain 40.0 g (63%) of Intermediate A-11-1.
b) Synthesis of Intermediate A-11-2
Intermediate A-11-1 (17.7 g, 80.8 mmol), 4-bromo-biphenyl (18.8 g, 80.8 mmol), sodium t-butoxide (NaOtBu) (11.6 g, 121.1 mmol), Pd2(dba)3 (4.4 g, 4.8 mmol), and tri t-butylphosphine (P(tBu)3) (5.9 g, 50% in toluene) were added to xylene (400 mL) and then, heated and refluxed under a nitrogen flow for 12 hours. After removing the xylene, the residue was treated through column chromatography to obtain 20.0 g (67%) of Intermediate A-11-2.
c) Synthesis of Compound A-11
Compound A-11 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate A-11-2 and Intermediate A-2-3 were used in an equivalent ratio of 1:1.
LC/MS calculated for: C50H34N2 Exact Mass: 662.27 found for 662.31 [M+H]
Compound A-12 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate A-3-3 and Intermediate A-11-2 were used in an equivalent ratio of 1:1.
LC/MS calculated for: C50H34N2 Exact Mass: 662.27 found for 662.30 [M+H]
a) Synthesis of Intermediate A-29-1
Aniline (8.3 g, 89.5 mmol), 4-(4-Bromo-phenyl)-dibenzofuran (23.1 g, 71.5 mmol), sodium t-butoxide (NaOtBu) (12.9 g, 134.2 mmol), Pd2(dba)3 (4.9 g, 5.4 mmol), and tri t-butylphosphine (P(tBu)3) (6.5 g, 50% in toluene) were added to xylene (400 mL) and then, heated and refluxed under a nitrogen flow for 12 hours. After removing the xylene, the residue was treated through column chromatography to obtain 20.0 g (67%) of Intermediate A-29-1.
b) Synthesis of Compound A-29
Compound A-29 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate A-29-1 and Intermediate A-2-3 were used in an equivalent ratio of 1:1.
LC/MS calculated for: C46H30N2O Exact Mass: 626.24 found for 626.28 [M+H]
a) Synthesis of Intermediate A-38-1
9,9-dimethyl-9H-fluoren-2-ylamine (17.4 g, 83.0 mmol), 4-bromo-biphenyl (15.5 g, 66.4 mmol), sodium t-butoxide (NaOtBu) (12.0 g, 124.5 mmol), Pd2(dba)3 (4.6 g, 5.0 mmol), and tri t-butylphosphine (P(tBu)3) (6.0 g, 50% in toluene) were put in xylene (400 mL) and then, heated and refluxed under a nitrogen flow for 12 hours. After removing the xylene, the residue was treated through column chromatography to obtain 18.0 g (60%) of Intermediate A-38-1.
b) Synthesis of Compound A-38
Compound A-38 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate A-38-1 and Intermediate A-3-3 were used in an equivalent ratio of 1:1.
LC/MS calculated for: C49H36N2 Exact Mass: 652.29 found for 652.33 [M+H]
a) Synthesis of Intermediate A-51-1
Intermediate A-3-3 (30.0 g, 80.6 mmol), 4-chlorophenyl boronic acid (15.1 g, 96.7 mmol), K2CO3 (22.3 g, 161.2 mmol), and Pd(PPh3)4 (2.8 g, 2.4 mmol) were put in a round-bottomed flask and dissolved in 200 ml of tetrahydrofuran and 100 ml of distilled water and then, stirred at 80° C. for 12 hours. When a reaction was complete, after removing an aqueous layer therefrom, the residue was treated through column chromatography to obtain 27.0 g (83%) of Intermediate A-51-1.
b) Synthesis of Compound A-51
Compound A-51 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate A-51-1 and bis-biphenyl-4-yl-amine were used in an equivalent ratio of 1:1.
LC/MS calculated for: C52H36N2 Exact Mass: 688.29 found for 688.34 [M+H]
a) Synthesis of Intermediate A-65-1
1,4-dibromo-2-nitro-benzene (30.0 g, 106.8 mmol), 2-naphthalene boronic acid (18.4 g, 106.8 mmol), K2CO3 (29.5 g, 213.6 mmol), and Pd(PPh3)4 (3.7 g, 3.2 mmol) were put in a round-bottomed flask and dissolved in 300 mL of tetrahydrofuran and 150 mL of distilled water and then, stirred at 80° C. for 12 hours. When a reaction was complete, after removing the aqueous layer therefrom, the residue was treated through column chromatography to obtain 27.0 g (77%) of intermediate A-65-1.
b) Synthesis of Intermediate A-65-2
Intermediate A-65-1 (27.0 g, 82.3 mmol) and triphenylphosphine (86.3 g, 329.1 mmol) were put in a round-bottomed flask and dissolved in 300 mL of 1,2-dichlorobenzene and then, stirred at 180° C. for 12 hours. When a reaction was complete, after removing the solvent, the residue was treated through column chromatography to obtain 18.0 g (74%) of Intermediate A-65-2.
c) Synthesis of Intermediate A-65-3
Intermediate A-65-3 was synthesized according to the same method as the c) of Synthesis Example 1 except that Intermediate A-65-2 and iodobenzene were used in an equivalent ratio of 1:3.
d) Synthesis of Compound A-65
Compound A-65 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate A-65-3 and bis-biphenyl-4-yl-amine were used in an equivalent ratio of 1:1.
LC/MS calculated for: C46H32N2 Exact Mass: 612.26 found for 612.30 [M+H]
a) Synthesis of Intermediate A-72-1
Intermediate A-72-1 was synthesized according to the same method as the a) of Synthesis Example 1 except that phenylhydrazinehydrochloride and 6-bromo-3,4-dihydro-1H-naphthalen-2-one were respectively used by 1.0 equivalent.
b) Synthesis of Intermediate A-72-2
Intermediate A-72-2 was synthesized according to the same method as the b) of Synthesis Example 1 except that Intermediate A-72-1 and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone were used in an equivalent ratio of 1:1.5.
c) Synthesis of Intermediate A-72-3
Intermediate A-72-3 was synthesized according to the same method as the c) of Synthesis Example 1 except that Intermediate A-72-2 and iodobenzene were used in an equivalent ratio of 1:3.
d) Synthesis of Compound A-72
Compound A-72 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate A-72-3 and bis-biphenyl-4-yl-amine were used in an equivalent ratio of 1:1.
LC/MS calculated for: C46H32N2 Exact Mass: 612.26 found for 612.31 [M+H]
a) Synthesis of Intermediate A-77-1
Intermediate A-77-1 was synthesized according to the same method as the a) of Synthesis Example 11 except that 1,4-dibromo-2-nitro-benzene and 1-naphthalene boronic acid were respectively used by 1.0 equivalent.
b) Synthesis of Intermediate A-77-2
Intermediate A-77-2 was synthesized according to the same method as the b) of Synthesis Example 11 except that Intermediate A-77-1 and triphenylphosphine were used in an equivalent ratio of 1:4.
c) Synthesis of Intermediate A-77-3
Intermediate A-77-3 was synthesized according to the same method as the c) of Synthesis Example 1 except that Intermediate A-77-2 and iodobenzene were used in an equivalent ratio of 1:3.
d) Synthesis of Compound A-77
Compound A-77 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate A-77-3 and bis-biphenyl-4-yl-amine were used in an equivalent ratio of 1:1.
LC/MS calculated for: C46H32N2 Exact Mass: 612.26 found for 612.29 [M+H]
The compound, biphenylcarbazolyl bromide, (12.33 g, 30.95 mmol) was dissolved in 200 mL of toluene in an nitrogen environment, biphenylcarbazolylboronic acid (12.37 g, 34.05 mmol) and tetrakis(triphenylphosphine)palladium (1.07 g, 0.93 mmmol) were added thereto, and the obtained mixture was stirred. Potassium carbonate saturated in water (12.83 g, 92.86 mmol) was added thereto, and the obtained mixture was heated and refluxed at 90° C. for 12 hours. When a reaction was complete, water was added to the reaction solution, and the mixture was extracted by using dichloromethane (DCM), filtered after removing moisture therefrom by using anhydrous MgSO4, and concentrated under a reduced pressure. A residue obtained therefrom was separated and purified through flash column chromatography to obtain Compound V-1 (18.7 g, 92%).
LC/MS calculated for: C48H32N2 Exact Mass: 636.26 found for 636.30 [M+H]
8 g (31.2 mmol) of Intermediate V-2-1 (5,8-dihydro-indolo[2,3-C]carbazole), 20.5 g (73.32 mmol) of 4-iodobiphenyl, 1.19 g (6.24 mmol) of CuI, 1.12 g (6.24 mmol) of 1,10-phenanthoroline, and 12.9 g (93.6 mmol) of K2CO3 were put in a round-bottomed flask, 50 ml of DMF was added thereto to dissolve them, and the solution was refluxed and stirred under a nitrogen atmosphere for 24 hours. When a reaction was complete, distilled water was added thereto, and a precipitate therefrom was filtered. The solid was dissolved in 250 ml of xylene, filtered with silica gel, and precipitated into a white solid to obtain 16.2 g (93%) of Compound V-2.
LC/MS calculated for: C42H28N2 Exact Mass: 560.23 found for 560.27 [M+H]
a) Synthesis of Intermediate V-3-1
Intermediate V-3-1 was synthesized according to the same method as the c) of Synthesis Example 1 except that 3-bromo-9H-carbazole and iodobenzene were used in an equivalent ratio of 1:3.
b) Synthesis of Intermediate V-3-2
Intermediate V-3-2 was synthesized according to the same method as Comparative Synthesis Example 1 except that Intermediate V-3-1 and 4-chlorophenylboronic acid were used in an equivalent ratio of 1:1.5.
c) Synthesis of Compound V-3
Compound V-3 was synthesized according to the same method as the d) of Synthesis Example 1 except that Intermediate V-3-2 and bis-biphenyl-4-yl-amine were used in an equivalent ratio of 1:1.
LC/MS calculated for: C46H32N2 Exact Mass: 638.27 found for 639.20 [M+H]
Compounds B-31, B-32, B-33, B-35, B-36, B-37, and B-56 were synthesized referring to the synthesis method disclosed in Korean Patent Laid-Open Publication No. 10-2014-0135524 using Starting material 1 and Starting material 2.
Compound B-6 was synthesized according to the same method as Comparative Synthesis Example 1 by using 2-chloro-4,6-diphenyl-1,3,5-triazine and 4,4,5,5-tetramethyl-2-[3-(2-triphenylenyl)phenyl]-1,3,2-dioxaborolane in an equivalence ratio of 1:1.1.
LC/MS calculated for: C46H32N2 Exact Mass: 535.20 found for 536.18 [M+H]
A glass substrate coated with ITO (Indium tin oxide) with a thickness of 1500 Å was washed with distilled water ultrasonically. After washing with the distilled water, the glass substrate was washed with a solvent such as isopropyl alcohol, acetone, methanol, and the like ultrasonically and dried and then, moved to a plasma cleaner, cleaned by using oxygen plasma for 10 minutes, and moved to a vacuum depositor. This obtained ITO transparent electrode was used as an anode, Compound A was vacuum-deposited on the ITO substrate to form a 700 Å-thick hole injection layer, and Compound B was deposited to be 50 Å-thick on the injection layer, and then Compound C was deposited to be 700 Å-thick to form a hole transport layer. On the hole transport layer, Compound C-1 was vacuum-deposited to form a 400 Å-thick hole transport auxiliary layer. On the hole transport auxiliary layer, 400 Å-thick light emitting layer was formed by using Compounds A-2 and B-31 simultaneously as a host and doping 2 wt % of [Ir(piq)2acac] as a dopant by a vacuum-deposition. Herein Compound A-2 and Compound B-31 were used in a weight ratio of 5:5 and their ratios in the following Examples were separately provided. Subsequently, on the light emitting layer, a 300 Å-thick electron transport layer was formed by simultaneously vacuum-depositing Compound D and Liq in a ratio of 1:1, and on the electron transport layer, Liq and Al were sequentially vacuum-deposited to be 15 Å-thick and 1200 Å-thick, manufacturing an organic light emitting diode.
The organic light emitting diode had a five-layered organic thin layer, and specifically the following structure.
ITO/Compound A (700 Å)/Compound B (50 Å)/Compound C (700 Å)/Compound C-1 (400 Å)/EML [Compound A-2: B-31:[Ir(piq)2acac] (2 wt %)] (400 Å)/Compound D:Liq (300 Å)/Liq (15 Å)/Al (1200 Å).
Each organic light emitting diode was manufactured according to the same method as Example 1 except for changing compositions as shown in Table 1.
Power efficiency of the organic light emitting diodes according to Examples 1 to 12 and Comparative Examples 1 to 3 was evaluated.
Specific measurement methods are as follows, and the results are shown in Table 2.
(1) Measurement of Current Density Change Depending on Voltage Change
The obtained organic light emitting diodes were measured regarding a current value flowing in the unit device, while increasing the voltage from 0 V to 10 V using a current-voltage meter (Keithley 2400), and the measured current value was divided by area to provide the results.
(2) Measurement of Luminance Change Depending on Voltage Change
Luminance was measured by using a luminance meter (Minolta Cs-1000A), while the voltage of the organic light emitting diodes was increased from 0 V to 10 V.
(3) Measurement of Power Efficiency
Power efficiency (cd/A) at the same current density (10 mA/cm2) were calculated by using the luminance, current density, and voltages (V) from the items (1) and (2).
(4) Measurement of Life-span
The results were obtained by measuring a time when current efficiency (cd/A) was decreased down to 97%, while luminance (cd/m2) was maintained to be 9000 cd/m2.
(5) Measurement of Driving Voltage
A driving voltage of each diode was measured using a current-voltage meter (Keithley 2400) at 15 mA/cm2.
Referring to Table 2, organic light emitting diodes according to Examples 1 to 12 exhibited greatly improved driving voltage, efficiency, and life-span compared with the organic light emitting diodes according to Comparative Examples 1 to 3.
While this invention has been described in connection with what is presently considered to be practical embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2018-0041665 | Apr 2018 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2019/002846 | 3/12/2019 | WO | 00 |
