HETEROCYCLIC COMPOUND AND ORGANIC ELECTROLUMINESCENT DEVICE THEREOF

Provided are a heterocyclic compound and an organic electroluminescent device thereof, which specifically relates to the technical field of organic electroluminescent materials. Since the heterocyclic compound provided in the present disclosure has a relatively large conjugate, electron migration efficiency can be improved, thereby balancing transport of electrons and holes; and meanwhile, the holes can be blocked to escape to an interface of a light-emitting layer, thereby improving an effective recombination probability of the holes and the electrons. Moreover, the heterocyclic compound has a relatively high glass transition temperature, good thermal stability and film-forming stability. When used as a material of the light-emitting layer or a material of an electron transport region, the heterocyclic compound can reduce a drive voltage and significantly improve luminescence efficiency and a lifetime of the device.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims priority to Chinese Patent Application No. CN 202311034007.0 filed Aug. 16, 2023, the disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the technical field of organic electroluminescent materials and specifically, relates to a heterocyclic compound and an organic electroluminescent device thereof.

BACKGROUND

An organic light-emitting diode (OLED) has features such as high brightness, a wide selection range of materials, a low drive voltage and full-curing active light emission and has advantages such as high clarity, a wide angle of view and a high-speed response that can smoothly display an animation. The OLED is a hot research field in more than a recent decade and widely applied to high-end products in fields such as flat-panel display, lamp lighting and micro-display.

A light-emitting principle of an organic electroluminescent device is as follows: under an action of an applied electric field, holes and electrons are injected from an anode and a cathode, respectively, and recombined in a light-emitting layer to form excitons, the excitons transfer energy to organic light-emitting molecules so that the organic light-emitting molecules transit from a ground state to an excited state, excited molecules are in an unstable state, and when the excited molecules return from the excited state to the ground state, energy is released in a light form so that a light emission phenomenon occurs. At present, a device structure of the OLED is mostly sandwich-shaped and includes a cathode, an anode and organic layers disposed between the cathode and the anode. The organic layers are also divided into a hole injection layer, a hole transport layer, a hole blocking layer, an electron blocking layer, an electron injection layer, an electron transport layer, a light-emitting layer and a light extraction layer according to different functions of the organic layers.

With the continuous development of the organic electroluminescent device, the development of various functional materials has been far from meeting market requirements so that an organic electroluminescent material has also become a research hotspot in the field. At present, the organic electroluminescent device has the problems such as a high drive voltage, low luminescence efficiency and high power consumption. This is because an electron transport material has low electron transport efficiency, transport of electrons and holes is imbalanced and the electrons and the holes cannot be effectively transported to the light-emitting layer.

Moreover, energy levels between functional layers are mismatched, which causes some electrons and holes to escape from the light-emitting layer, resulting in the decrease of the luminescence efficiency and the increase of the drive voltage. The light-emitting layer also has the problems such as imbalanced migrations of electrons and holes and a mismatch between triplet energy levels of host and guest materials so that efficiency of forming excitons through the recombination of the electrons and the holes is also low, thereby affecting the luminescence efficiency of the organic electroluminescent device.

The optimization and performance improvement of the OLED device can be achieved by improving materials of different functional layers in the device. Therefore, for the problems in the electron transport material and a material of the light-emitting layer at present, an electron transport material, a hole blocking material and a host material of the light-emitting layer with more excellent performance need to be developed.

SUMMARY

For the problems such as a high drive voltage, low luminescence efficiency and a short lifetime of an organic electroluminescent device in the related art, the present disclosure provides a heterocyclic compound, which can significantly improve the above problems, so that the organic electroluminescent device has a low drive voltage, high luminescence efficiency and a long service life.

Specifically, the present disclosure provides a heterocyclic compound, wherein the heterocyclic compound has a structure represented by Formula I.

wherein in Formula I, X is independently selected from C(R2) or an N atom, at least one X is selected from an N atom, and X bonded to Ar1, Ar2or L is selected from a C atom;

X1is independently selected from a C atom or an N atom;

Ar1and Ar2are independently selected from any one of substituted or unsubstituted C6 to C30 aryl or substituted or unsubstituted C2 to C30 heteroaryl;

L1and L2are independently selected from any one of a single bond, substituted or unsubstituted C6 to C30 arylene or substituted or unsubstituted C2 to C30 heteroarylene;

Ra is independently selected from any one of hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted silyl, substituted or unsubstituted C1 to C12 alkoxy, substituted or unsubstituted C3 to C12 cycloalkyl or substituted or unsubstituted C2 to C12 heterocycloalkyl;

n0is independently selected from 0, 1, 2, 3, 4 or 5, when n0is greater than 1, two or more Ra are the same as or different from each other, or two adjacent Ra are joined to form a substituted or unsubstituted benzene ring;

L is independently selected from any one of the following groups:

wherein R1is independently selected from any one of hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted silyl, substituted or unsubstituted C1 to C12 alkoxy, substituted or unsubstituted C3 to C12 cycloalkyl or substituted or unsubstituted C2 to C12 heterocycloalkyl;

n1is independently selected from 0, 1, 2, 3 or 4; n2is independently selected from 0, 1, 2 or 3; when n1is greater than 1, two or more R1are the same as or different from each other, or two adjacent R1are joined to form a substituted or unsubstituted benzene ring;

with the proviso that one or more hydrogens in at least one group of Ar1, Ar2, L, L1, L2, R2or Ra are substituted with a group represented by Formula III:

Formula III; Rx is independently selected from any one of hydrogen, deuterium, cyano, nitro, halogen, substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted C2 to C12 alkenyl, substituted or unsubstituted C3 to C12 cycloalkyl or substituted or unsubstituted C2 to C12 heterocycloalkyl; and

the present disclosure does not include the following compound:

The present disclosure further provides an organic electroluminescent device, wherein the organic electroluminescent device includes an anode, a cathode facing the anode and an organic layer located between the anode and the cathode or outside at least one electrode of the anode or the cathode, wherein the organic layer includes any one or more of the heterocyclic compounds of the present disclosure.

The heterocyclic compound provided in the present disclosure has a relatively large conjugate so that electron migration efficiency can be improved, thereby balancing transport of electrons and holes. Moreover, the heterocyclic compound further has proper HOMO and LUMO energy levels, thereby reducing a transport barrier in an electron migration process and reducing the drive voltage. Moreover, the holes can also be blocked to escape to an interface of a light-emitting layer to avoid the recombination of the holes and the electrons at the interface of the light-emitting layer, thereby reducing a loss of the lifetime of the device and improving the luminescence efficiency of the device. Moreover, the heterocyclic compound has the relatively large conjugate and a relatively large steric hindrance so that a glass transition temperature is further improved and the heterocyclic compound is not easy to decompose at a high temperature and has good chemical stability and thermal stability, thereby improving a form of evaporation film formation and prolonging the lifetime of the device.

DETAILED DESCRIPTION

The present disclosure is further described below in conjunction with embodiments. It is to be understood that the embodiments described below are intended to describe the present disclosure and not to limit the scope of the present disclosure. After the present disclosure is read, various equivalent modifications made by those skilled in the art to the present disclosure are all within the scope of the present application.

In a compound of the present disclosure, any atom not specified as a particular isotope is included as any stable isotope of the atom and includes atoms between its natural isotope abundance and its unnatural abundance.

A halogen atom in the present disclosure includes fluorine, chlorine, bromine and iodine.

In the present disclosure, when a position of a substituent on an aromatic ring is unfixed, it indicates that the substituent may be linked to any of the corresponding optional sites of the aromatic ring. For example,

may represent

may represent

may represent

The same is true in other cases.

In the present disclosure, an expression that “two adjacent groups are joined to form a ring” means that adjacent groups are bound to each other and optionally aromatized to form a substituted or unsubstituted aromatic ring, heteroaromatic ring, aliphatic ring or aliphatic heterocyclic ring. The “adjacent groups” refer to two substituents on two directly joined atoms, a substituent disposed closest to a corresponding substituent in space, or another substituent on an atom with a corresponding substituent. For example, two substituents substituting at ortho positions of a benzene ring or two substituents on the same carbon atom in an alicyclic ring may be considered “adjacent” to each other.

The aliphatic ring or the aliphatic heterocyclic ring may be a saturated ring or an unsaturated ring. Specifically, the ring formed through the joining may be a three-membered ring, a four-membered ring, a five-membered ring, a six-membered ring, a seven-membered ring, a spirocyclic ring or a fused ring. The number of ring-forming carbon atoms of the formed aromatic ring is preferably 6 to 30 carbon atoms, particularly preferably 6 to 18 carbon atoms and most preferably 6 to 12 carbon atoms. The number of ring-forming carbon atoms of the formed heteroaromatic ring is preferably 2 to 30 carbon atoms, particularly preferably 2 to 18 carbon atoms and most preferably 2 to 12 carbon atoms. The number of ring-forming carbon atoms of the formed aliphatic ring is preferably 3 to 30 carbon atoms, particularly preferably 3 to 18 carbon atoms, more preferably 3 to 12 carbon atoms and most preferably 3 to 8 carbon atoms. The number of ring-forming carbon atoms of the formed aliphatic heterocyclic ring is preferably 3 to 30 carbon atoms, particularly preferably 2 to 18 carbon atoms, more preferably 2 to 12 carbon atoms and most preferably 2 to 8 carbon atoms. Further, the ring formed through the joining may have, but is not limited to, the following cases: for example, benzene, naphthalene, indene, cyclopentene, cyclopentane, cyclopentanobenzene, cyclohexene, cyclohexane, cyclohexanobenzene, pyridine, quinoline, isoquinoline, benzofuran, benzothiophene, dibenzofuran, dibenzothiophene, phenanthrene or pyrene.

Alkyl in the present disclosure refers to a monovalent group obtained by removing one hydrogen atom from an alkane molecule. Alkyl may be linear alkyl or branched alkyl, preferably has 1 to 12 carbon atoms, more preferably has 1 to 8 carbon atoms and particularly preferably has 1 to 6 carbon atoms. Examples of alkyl may include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, isobutyl, sec-butyl, n-pentyl, isopentyl, n-hexyl, and the like.

Cycloalkyl in the present disclosure refers to a monovalent group obtained by removing one hydrogen atom from a cycloalkane molecule. Cycloalkyl preferably has 3 to 12 carbon atoms, more preferably has 3 to 10 carbon atoms and particularly preferably has 3 to 6 carbon atoms. Examples of cycloalkyl may include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, adamantyl, norbornyl, and the like.

Alkoxy in the present disclosure is represented by —O-alkyl. Alkoxy may be linear alkoxy or branched alkoxy, preferably has 1 to 12 carbon atoms, more preferably has 1 to 8 carbon atoms and particularly preferably has 1 to 6 carbon atoms. Examples may include, but are not hinted to, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, tert-butoxy, n-pentoxy, n-hexoxy, and the like.

Aryl in the present disclosure refers to the generic term of monovalent groups obtained by removing one hydrogen atom from the aromatic nucleus carbon of an aromatic compound molecule. Aryl includes monocyclic aryl, polycyclic aryl, fusedcyclic aryl, or a combination thereof. Aryl preferably has 6 to 30 carbon atoms, particularly preferably has 6 to 18 carbon atoms and most preferably has 6 to 12 carbon atoms. Examples include, but are not limited to, the following groups: phenyl, biphenyl, terphenyl, tetraphenyl, naphthyl, phenanthryl, anthryl, triphenylenyl, fluorenyl, benzofluorenyl, spirobifluorenyl, benzospirobifluorenyl, pyrenyl, fluoranthenyl, chrysenyl, and the like.

Silyl in the present disclosure refers to a monovalent group obtained by removing one hydrogen atom from a silane molecule and may be represented by a group shown in —Si(Rs)(Rs)(Rs), where Rs is selected from hydrogen, deuterium, cyano or halogen or selected from any one or more of the above alkyl, alkenyl, alkoxy or cycloalkyl. Silyl preferably has 1 to 30 carbon atoms, preferably has 1 to 25 carbon atoms, more preferably has 1 to 22 carbon atoms and most preferably has 1 to 18 carbon atoms. Examples of silyl may include, but are not limited to, trimethylsilyl, triethylsilyl, triisopropylsilyl, tri-tert-butylsilyl, dimethylethylsilyl, dimethyl-tert-butylsilyl, diethylmethyllsilyl, tricyclopropylsilyl, tricyclobutylsilyl, and the like.

The aliphatic ring in the present disclosure may be a saturated ring or an unsaturated ring, may include cycloalkane, cycloolefin, cycloalkyne, and the like. The aliphatic ring preferably has 3 to 25 carbon atoms, more preferably 3 to 20 carbon atoms, particularly preferably 3 to 15 carbon atoms, preferably 5 to 10 carbon atoms, and most preferably 5 to 7 carbon atoms. Examples of the aliphatic ring may include, but are not limited to, cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, adamantane, norbornene alkanes, cyclopropene, cyclobutene, cyclopentene, cyclohexene, cycloheptene, and the like.

Arylene in the present disclosure refers to aryl having two binding positions, that is, a divalent group. In addition to being the divalent group, arylene may be applicable to the above description of aryl.

Heteroarylene in the present disclosure refers to heteroaryl having two binding positions, that is, a divalent group. In addition to being the divalent group, heteroarylene may be applicable to the above description of heteroaryl.

The present disclosure provides a heterocyclic compound, wherein the heterocyclic compound has a structure represented by Formula I:

wherein in Formula I, X is independently selected from C(R2) or an N atom, at least one X is selected from an N atom, and X bonded to Ar1, Ar2or L is selected from a C atom;

X1is independently selected from a C atom or an N atom;

Ar1and Ar2are independently selected from any one of substituted or unsubstituted C6 to C30 aryl or substituted or unsubstituted C2 to C30 heteroaryl;

L1and L2are independently selected from any one of a single bond, substituted or unsubstituted C6 to C30 arylene or substituted or unsubstituted C2 to C30 heteroarylene;

Ra is independently selected from any one of hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted silyl, substituted or unsubstituted C1 to C12 alkoxy, substituted or unsubstituted C3 to C12 cycloalkyl or substituted or unsubstituted C2 to C12 heterocycloalkyl;

n0is independently selected from 0, 1, 2, 3, 4 or 5, when n0is greater than 1, two or more Ra are the same as or different from each other, or two adjacent Ra are joined to form a substituted or unsubstituted benzene ring;

L is independently selected from any one of the following groups:

wherein R1is independently selected from any one of hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted silyl, substituted or unsubstituted C1 to C12 alkoxy, substituted or unsubstituted C3 to C12 cycloalkyl or substituted or unsubstituted C2 to C12 heterocycloalkyl;

n1is independently selected from 0, 1, 2, 3 or 4; n2is independently selected from 0, 1, 2 or 3; when n1is greater than 1, two or more R1are the same as or different from each other, or two adjacent R1are joined to form a substituted or unsubstituted benzene ring;

with the proviso that one or more hydrogens in at least one group of Ar1, Ar2, L, L1, L2, R2or Ra are substituted with a group represented by Formula III:

Formula III; Rx is independently selected from any one of hydrogen, deuterium, cyano, nitro, halogen, substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted C2 to C12 alkenyl, substituted or unsubstituted C3 to C12 cycloalkyl or substituted or unsubstituted C2 to C12 heterocycloalkyl; and

the present disclosure does not include the following compound:

Preferably, one X in

is selected from an N atom; more preferably, two X in

are selected from an N atom; more preferably, three X in

are selected from an N atom.

is selected from any one of the following groups:

wherein a definition of R2is the same as that described above, and m0is independently selected from 0, 1 or 2; and

“*” is a linkage site where L1, L2or L is joined.

Preferably, the heterocyclic compound is selected from at least one of the following structures:

wherein definitions of Ar1, Ar2, R2, L, L1, L2, X1, Ra and n0are the same as those described above.

More preferably, the heterocyclic compound represented by Formula I is selected from any one of the following structures represented by Formula III-1 to Formula III-5:

wherein definitions of Ar1, Ar2, R2, L, L1, L2, X1, Ra and n0are the same as those described above.

Preferably, R2is independently selected from the group represented by Formula III.

Preferably, Ar1and Ar2are independently selected from any one of the following groups:

wherein Y is independently selected from C(R5) or an N atom, and Y at a linkage site is selected from a C atom;

the ring M is selected from an unsubstituted C3 to C7 aliphatic ring or a C3 to C7 aliphatic ring substituted with one or more R6;

Z1is selected from an O atom or an S atom, and Z2is selected from O, S, C(R7)2or N(R8);

R3and R7are independently selected from any one of hydrogen, deuterium, substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted C1 to C12 alkoxy, substituted or unsubstituted C3 to C12 cycloalkyl, substituted or unsubstituted silyl, substituted or unsubstituted C2 to C12 heterocycloalkyl, substituted or unsubstituted C6 to C30 aryl or substituted or unsubstituted C2 to C30 heteroaryl, or two adjacent R3are joined to form a substituted or unsubstituted spirocyclic structure;

R4and R8are independently selected from any one of substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted C3 to C12 cycloalkyl, substituted or unsubstituted silyl, substituted or unsubstituted C2 to C12 heterocycloalkyl, substituted or unsubstituted C6 to C30 aryl or substituted or unsubstituted C2 to C30 heteroaryl; and

R5and R6are independently selected from any one of hydrogen, deuterium, tritium, cyano, nitro, halogen, substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted C1 to C12 alkoxy, substituted or unsubstituted silyl, substituted or unsubstituted C3 to C12 cycloalkyl, substituted or unsubstituted C2 to C12 heterocycloalkyl, substituted or unsubstituted C6 to C30 aryl or substituted or unsubstituted C2 to C30 heteroaryl, or two adjacent R5are joined to form a substituted or unsubstituted ring.

Preferably, at most three Y in each of the above groups are selected from an N atom; further preferably, three Y in each of the above groups are selected from an N atom; more preferably, two Y in each of the above groups are selected from an N atom; more preferably, one Y in each of the above groups is selected from an N atom; particularly preferably, each Y in each of the above groups is independently selected from C(R5).

Preferably, the ring M is selected from any one of the following groups:

wherein “*” represents a bonding site; and

More preferably, Ar1and Ar2are independently selected from any one of the following groups:

wherein R3and R7are independently selected from any one of hydrogen, deuterium, substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted C1 to C12 alkoxy, substituted or unsubstituted C3 to C12 cycloalkyl, substituted or unsubstituted silyl, substituted or unsubstituted C2 to C12 heterocycloalkyl, substituted or unsubstituted C6 to C30 aryl or substituted or unsubstituted C2 to C30 heteroaryl, or two adjacent R3are joined to form the following spirocyclic structure:

R4and R8are independently selected from any one of substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted C3 to C12 cycloalkyl, substituted or unsubstituted silyl, substituted or unsubstituted C2 to C12 heterocycloalkyl, substituted or unsubstituted C6 to C30 aryl or substituted or unsubstituted C2 to C30 heteroaryl;

Preferably, R6is selected from the group represented by Formula III; more preferably, R5is selected from the group represented by Formula III.

More preferably, one or two of R5in each group and, if permitted, three or more of R5in each group are selected from the group represented by Formula III.

Preferably, R3is selected from the group represented by Formula III; more preferably, R7is selected from the group represented by Formula III.

Preferably, R4is selected from the group represented by Formula III; more preferably, R8is selected from the group represented by Formula III.

Preferably, Ra is selected from the group represented by Formula III.

is independently selected from any one of the following groups:

In the present disclosure, the expression that “one or more hydrogens in at least one group of Ar1, Ar2, L, L1, L2, R2or Ra are substituted with a group represented by Formula III” specifically means that one, two, three, four, five, six, seven, eight or more hydrogens in any one, any two, any three, any four or all groups of Ar1, Ar2, L, L1, L2, R2or Ra are substituted with the group represented by Formula III.

Preferably, one or more hydrogens in at least one group of Ar1, Ar2, L, L1, L2or Ra are substituted with the group represented by Formula III; more preferably, one or more hydrogens in at least one group of Ar1, Ar2or Ra are substituted with the group represented by Formula III; more preferably, one or more hydrogens in Ar1or Ar2are substituted with the group represented by Formula III; particularly preferably, one or more hydrogens in Ra are substituted with the group represented by Formula III.

Preferably, one, two, three or four of Ra or R5are selected from the group represented by Formula III.

More preferably, one or two of Ra are selected from the group represented by Formula III.

More preferably, one or two of R5are selected from the group represented by Formula III.

More preferably, one or two of Ra and one or two of R5are selected from the group represented by Formula III.

Preferably, Formula III is selected from any one of the following groups:

More preferably, L is independently selected from any one of the following groups:

Preferably, L1and L2are independently selected from any one of a single bond or the following group:

wherein R9is independently selected from any one of hydrogen, deuterium, cyano, nitro, halogen, substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted C1 to C12 alkoxy, substituted or unsubstituted C3 to C12 cycloalkyl, substituted or unsubstituted silyl, substituted or unsubstituted C2 to C12 heterocycloalkyl, substituted or unsubstituted C6 to C30 aryl or substituted or unsubstituted C2 to C30 heteroaryl; and

Preferably, R9is selected from the group represented by Formula III.

Most preferably, the heterocyclic compound is selected from any one of the following structures:

Some specific chemical structures of the heterocyclic compound of the present disclosure represented by Formula I are exemplified above. However, the present disclosure is not limited to the exemplified chemical structures. Any structures based on the structure represented by Formula I and having substituents which are the groups defined above are included.

The present disclosure further provides an organic electroluminescent device, wherein the organic electroluminescent device includes an anode, a cathode facing the anode and an organic layer, wherein the organic layer includes any one or more of the heterocyclic compounds of the present disclosure.

The organic electroluminescent device of the present disclosure includes at least the anode, the cathode facing the anode and the organic layer. One organic electroluminescent device may include one or more organic layers, wherein the organic layer may be located between the anode and the cathode or outside at least one electrode of the anode or the cathode, and preferably, the organic layer includes any one or more of the heterocyclic compounds of the present disclosure.

Preferably, the organic layer is located between the anode and the cathode and includes any one or more of the heterocyclic compounds of the present disclosure.

Preferably, the organic layer includes a light-emitting layer, an electron transport region and a hole transport region, wherein the light-emitting layer or the electron transport region includes any one or more of the heterocyclic compounds of the present disclosure.

Specifically, the organic layer located between the anode and the cathode may include a light-emitting layer, an electron transport region and a hole transport region, wherein the hole transport region includes a hole injection layer, a hole transport layer, a light-emitting auxiliary layer and an electron blocking layer, and the electron transport region includes a hole blocking layer, an electron transport layer and an electron injection layer; the organic layer located outside the at least one electrode of the anode or the cathode includes a light extraction layer. Each of the above functional layers may include a single film or multiple films. Each film may be composed of only one material or multiple materials.

Preferably, the organic layer includes a light-emitting layer, wherein the light-emitting layer includes any one or more of the heterocyclic compounds of the present disclosure.

Preferably, the light-emitting layer includes a host material and a guest material, wherein the host material includes any one or more of the heterocyclic compounds of the present disclosure.

Preferably, the organic layer includes an electron transport region, wherein the electron transport region includes at least one of an electron injection layer, an electron transport layer and a hole blocking layer, wherein the at least one of the electron injection layer, the electron transport layer and the hole blocking layer includes any one or more of the heterocyclic compounds of the present disclosure.

Preferably, the organic layer includes at least one of an electron transport layer or a hole blocking layer, wherein the at least one of the electron transport layer or the hole blocking layer includes any one or more of the heterocyclic compounds of the present disclosure.

Preferably, the organic layer includes an electron transport layer, wherein the electron transport layer includes any one or more of the heterocyclic compounds of the present disclosure.

Preferably, the organic layer includes a hole blocking layer, wherein the hole blocking layer includes any one or more of the heterocyclic compounds of the present disclosure.

Preferably, the organic layer includes a light extraction layer, wherein the light extraction layer includes any one or more of the heterocyclic compounds of the present disclosure.

A material of each film in the organic electroluminescent device is not particularly limited in the present disclosure, which may be a substance known in the art. The above-mentioned organic functional layers of the organic electroluminescent device and electrodes on two sides of the device are separately described below.

The anode in the present disclosure needs a relatively high work function to improve injection efficiency of holes. A material of the anode may be selected from the following materials such as a metal oxide, a combination of a metal and an oxide, and a metal or an alloy thereof. Specific examples may include, but are not limited to, indium tin oxide (ITO), indium zinc oxide (IZO), aluminium (Al), titanium (Ti), gold (Au), platinum (Pt), copper (Cu), silver (Ag), indium tin oxide/silver/indium tin oxide (ITO/Ag/ITO), and the like.

The cathode in the present disclosure needs a relatively low work function to improve injection efficiency of electrons. A material of the cathode may be selected from the following materials such as a metal or an alloy thereof. Specific examples may include, but are not limited to, aluminium (Al), silver (Ag), calcium (Ca), indium (In), magnesium:silver (Mg:Ag), and the like.

A material of the hole injection layer in the present disclosure needs a relatively good hole injection ability and a relatively proper HOMO energy level to reduce an interface barrier between the anode and the hole transport layer and improve the hole injection ability. The material of the hole injection layer may be selected from the following materials such as an arylamine derivative, a metal oxide, a phthalocyanine metal complex, a multi-cyano conjugated organic compound or a polymer. Specific examples may include, but are not limited to, 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene (HAT-CN), copper phthalocyanine (CuPC), 4,4′,4″-tris(N,N-2-naphthylphenylamino)triphenylamine (2-TNATA), 4,4′,4″-tris(N-3-methylphenyl-N-phenylamino)triphenylamine (m-MTDATA), 2,3,5,6-tetrafluoro-7,7′,8,8′-tetracyanodquinodimethane (F4-TCNQ), poly(4-vinyltriphenylamine) (PVTPA), and the like.

A material of the hole transport layer in the present disclosure needs a relatively high hole mobility to inject holes. The material of the hole transport layer may be selected from the following materials such as an arylamine derivative, a carbazole derivative, a fluorene derivative or a polymer. Specific examples may include, but are not limited to, N,N′-bis(1-naphthalenyl)-N,N′-bisphenyl-(1,1′-biphenyl)-4,4′-diamine (NPB), N,N′-bis(naphthalene-2-yl)-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (β-NPB), N,N,N′,N′-tetra-1-naphthalenyl[1,1′-biphenyl]-4,4′-diamine (α-TNB), N,N′-bis(3-methylphenyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine (TPD), 4,4′-cyclohexylidenebis[N,N-bis(4-methylphenyl)aniline](TAPC), 4,4′,4″-tris(carbazol-9-yl)-triphenylamine (TCTA), polyvinylcarbazole (PVC), and the like.

A material of the electron blocking layer in the present disclosure needs a relatively good hole transport ability and electron blocking ability to effectively transport holes and prevent electrons from escaping to an interface of the light-emitting layer. The material of the electron blocking layer may be selected from the following materials such as an arylamine derivative or a carbazole derivative. Specific examples may include, but are not limited to, N,N-bis([1,1′-biphenyl]-4-yl)-(9H-carbazol-9-yl)-[1,1′-biphenyl]-4-amine, N-(4′-(9H-carbazol-9-yl)-[1,1′-biphenyl]-4-N-([1,1′-biphenyl]-4-yl)-9,9-dimethyl-9H-fluoren-2-amine, N,N′-bis(naphthalene-1-yl)-N,N′-diphenyl-benzidine (NPD), and the like.

As a material of the light-emitting layer in the present disclosure, a red, green or blue light-emitting material may be used, and a guest (doped) material and a host material are generally contained. The guest material may be a simple fluorescent material, phosphorescent material or TADF material, or may be formed by a combination of the fluorescent and phosphorescent materials. The host material of the light-emitting layer needs not only a bipolar charge transport property but also a proper energy level to efficiently transfer excitation energy to the guest light-emitting material. The material of this type may include a diphenylvinylaryl derivative, a stilbene derivative, a carbazole derivative, a triarylamine derivative, an anthracene derivative and a pyrene derivative, preferably at least one of the heterocyclic compounds of the present disclosure. Specific examples may include, but are not limited to, 4,4′-bis(9-carbazole)biphenyl (CBP), 4,4′-bis(9-carbazolyl)-2,2′-dimethylbiphenyl (CDBP), 9-(4-tert-butylphenyl)-3,6-bis(triphenylsilyl)-9H-carbazole (CzSi), 9,9′-(2,6-pyridinediyldi-3,1-phenylene)bis-9H-carbazole (26DCZPPY), 9,9′-diphenyl-9H,9H-3,3′-bicarbazole (BCzPh), 9-(5-(3-9H-carbazol-9-yl)phenyl)pyridine-3-yl)-9H-carbazole (CPPyC), 4,4′-bis(carbazol-9-yl)-2,2′-dimethylbiphenyl (CDBP), 1,3-bis(N-carbazolyl)benzene (MCP), 9,9-dimethyl-N,N-diphenyl-7-(4-(1-phenyl-1H-benzo[d]imadazol-2-yl)phenyl)-9H-fluoren-2-a mine (EFIN), 10-(4′-(diphenylamino)biphenyl-4-yl)acridine-9(10H)-ketone (ADBP), tris[4-(pyrenyl)-phenyl]amine (TPyPA), 9,10-di(2-naphthyl)anthracene (ADN), 2-(tert-butyl)-9,10-di(2-naphthyl)anthracene (TBADN), 1-(7-[9,9′-bianthracene]-10-yl-9,9-dioctyl-9H-fluoren-2-yl)pyrene (BAnF8Pye), 9,9,9′,9′-tetra(4-methylphenyl)-2,2′-bi-9H-fluorene (BDAF), tris(6-fluoro-8-hydroquinolinato)aluminium (6FAlq3), tris(8-hydroxyquinolinato)aluminium (Alq3), bis(10-hydroxybenzo[H]quinolinato)beryllium (BeBq2), bis(8-hydroxyquinolinato)zinc (Znq2), and the like.

The guest material may be selected from, but is not limited to, any one or more of the following structures: a metal complex (for example, an iridium complex, a platinum complex, an osmium complex or a rhodium complex), an anthracene derivative, a pyrene derivative or a perylene derivative. Specific examples may include, but are not limited to, bis(2-(naphthalene-2-yl)pyridine)(acetylacetonate)iridium (Ir(npy)2acac), tris[2-phenyl-4-methylquinoline)]iridium (Ir(Mphq)3), acetylacetonate bis(2-phenylpyridine)irdium (Ir(ppy)2(acac)), (tris[2-(3-methyl-2-pyridinyl)phenyl]iridium (Ir(3mppy)3), bis(2-benzo[H]quinoline-C2,N′)(acetylacetonate)iridium(III) (Ir(bzq)2(acac)), tris(2-(3,5-dimethylphenyl)quinoline-C2,N′)iridium(III) (Ir(dmpq)3), (bis(1-phenyl-isoquinoline)(acetylacetonate)iridium(III) (Ir(piq)2(acac)), 2,5,8,11-tetra-tert-butylperylene (TBPe), rubrene, 9-(9-phenylcarbazol-3-yl)-10-(naphthalene-1-yl) (PCAN), 1,4-bis(4-(9H-carbazol-9-yl)styryl)benzene (BCzSB), 1,1′-(4,4′-(4-phenyl-4H-1,2,4-triazole-3,5-diyl)bis(4,1-phenylene))bis(1H-phenoxazine) (2PXZ-TAZ), and the like.

The hole blocking layer in the present disclosure has a relatively good electron transport ability and hole blocking ability to effectively transport electrons and prevent holes from escaping to the interface of the light-emitting layer. A material of the hole blocking layer may be selected from the following materials: a metal complex, a quinoline derivative, an imidazole derivative, a phenanthroline derivative, a triazole derivative and an azabenzene derivative, preferably at least one of the heterocyclic compounds of the present disclosure. Specific examples may include, but are not limited to, bis(2-methyl-8-quinolinolato-N1,O8)-(1,1′-biphenyl-4-olato)aluminum (BAlq), 1,3,5-tris(N-phenyl-2-benzimidazole)benzene (TPBi), 2,9-dimethyl-4,7-biphenyl-1,10-phenanthroline (BCP), 3,3′-[5′-[3-(3-pyridyl)phenyl][1,1′:3′,1″-terphenyl]-3,3″-diyl]dipyridine (TmPyPB), and the like.

An electron transport material in the present disclosure needs a relatively high electron mobility to inject electrons. The material of the electron transport layer may be selected from the following materials: a quinoline derivative, an imidazole derivative, a phenanthroline derivative, a triazole derivative, a metal chelate, an azabenzene derivative, a phenazine derivative, a silicon-containing heterocyclic compound and a boron-containing heterocyclic compound, preferably at least one of the heterocyclic compounds of the present disclosure. Specific examples may include, but are not limited to, tris(8-hydroxyquinolinato)aluminium (Alq3), 2,9-bis(naphthalene-2-yl)-4,7-biphenyl-1,10-phenanthroline (NBphen), 1,3,5-tris(4-pyridine-3-ylphenyl)benzene (TpPyPB), 1,3,5-tris(4-pyridylquinoline-2-yl)benzene (TPyQB), 3-(biphenyl-4-yl)-4-phenyl-5-(4-tert-butylphenyl)-1,2,4-triazole (TAZ) 1,3,5-tris(N-phenyl-2-benzimidazole)benzene (TPBi), tris[2,4,6-trimethyl-3-(3-pyridyl)phenyl]borine (3TPYMB), and the like.

An electron injection material in the present disclosure needs a relatively good electron injection ability and a relatively proper LUMO energy level to reduce an interface barrier between the cathode and the electron transport layer and improve the electron injection ability. The material of the electron injection layer includes, but is not limited to, the following materials: a metal, an alkali metal, an alkaline-earth metal, a metal compound, a metal oxide, a metal halide, an alkaline-earth metal compound, an alkaline-earth metal oxide, an alkaline-earth metal halide, an alkali metal compound, an alkali metal oxide and an alkali metal halide. Specific examples may include, but are not limited to, lithium (Li), strontium (Sr), ytterbium (Yb), lithium fluoride (LiF), sodium fluoride (NaF), cesium fluoride (CsF), calcium fluoride (CaF2), 8-hydroxyquinolinolato-lithium (Liq), tris(8-hydroxyquinolinato)aluminium (Alq3), cesium carbonate (Cs2CO3), rubidium acetate (CH3COORb), lithium oxide (Li2O), barium oxide (BaO), and the like.

The light extraction layer in the present disclosure has an effect of coupling light to improve light emission efficiency. A material of the light extraction layer may include the following materials: a metal compound, a triarylamine derivative, a benzidine derivative and a carbazole derivative, preferably at least one of the heterocyclic compounds of the present disclosure. Specific examples may include tris(8-hydroxyquinolinato)aluminium (Alq3), N,N′-bis(naphthalene-1-yl)-N,N′-bis(phenyl)-2,2′-dimethylbenzidine (NPD), 4,4′-bis(9-carbazole)biphenyl (CBP), and the like.

A method for preparing the films in the organic electroluminescent device of the present disclosure is not particularly limited, which may use, but is not limited to, a vacuum evaporation method, a sputtering method, a spin coating method, a spraying method, a screen printing method, and a laser transfer printing method.

The organic electroluminescent device of the present disclosure is mainly applied to the field of information display technology and the field of lighting and is widely applied to various information displays in the aspect of information display, such as a mobile phone, a tablet computer, a flat-panel television, a smart watch, VR, an in-vehicle system, a digital camera, a wearable device, and the like.

Synthesis Example

Note of raw materials and reagents: The raw materials or reagents used in the following synthesis examples are not particularly limited in the present disclosure and may be commercially available products or be prepared by preparation methods well-known to those skilled in the art.

A core structure of the compound of the present disclosure represented by Formula I may be prepared by the following reaction route. Substituents may be bonded by methods known in the art, and types, positions and numbers of the substituents may be changed according to technologies known in the art.

Main reaction types involved in the present disclosure are a Suzuki coupling reaction and a Miyaura borylation reaction. The raw materials in the synthetic route provided in the present disclosure may be commercially available products, or may be prepared by well-known preparation methods in the art.

For example, when L is selected from

the raw material A may be prepared by, but is not limited to, the following synthetic route:

The raw material C may be prepared by the following synthetic route:

wherein when Ar1is the same as Ar2, the above Ar1and Ar2groups may be introduced together into one step to obtain the raw material C, that is:

wherein Xa, Xb, Xc, Xd and Xe are independently selected from Cl, Br or I, and Ma is independently selected from

Alternatively, an order of the above reaction may also be changed to obtain the heterocyclic compound of the present disclosure represented by Formula I.

Synthesis Example 1: Preparation of Intermediate C-5

In step 1, under nitrogen protection, an anhydrous tetrahydrofuran solvent (50 mL) was added to magnesium turnings (5.04 g, 210 mmol), and then two grains of iodine were added; a tetrahydrofuran solution (100 mL) of b-143 (31.40 g, 200 mmol) was slowly added dropwise, and a Grignard reaction was initiated; after the dropwise addition was finished, the mixture was reacted for 7.5 h at room temperature; after the reaction was finished, the mixture was cooled to room temperature.

In step 2, under nitrogen protection, a-143 (36.88 g, 200 mmol) was added to a reaction flask, and then a tetrahydrofuran solvent (200 mL) was added; the system was reduced to −5° C., and then the Gregnard reagent prepared in step 1 was slowly added dropwise for 2 to 3 h; after the dropwise addition was finished, the mixture was reacted for 5 h at −5° C.; after the reaction was finished, the reaction solution was poured into 12% dilute hydrochloric acid; the mixture was fully stirred for 30 min and extracted with dichloromethane (300 mL×3 times), an organic phase was separated and dried with anhydrous magnesium sulfate, a solvent was concentrated by distillation at reduced pressure, and a filter cake was recrystallized with tetrahydrofuran after vacuum filtration to obtain Intermediate F-143 (28.03 g, with a yield of 62%) with an HPLC purity of ≥99.78%. Mass spectrometry (m/z): 224.9843 (theoretical value: 224.9861).

In step 3, under nitrogen protection, Intermediate F-143 (24.87 g, 110 mmol), d-143 (25.41 g, 100 mmol) and anhydrous potassium carbonate (27.64 g, 200 mmol) were added to a reaction flask, and then a toluene solution (250 ml) was added; after air was purged with nitrogen for three times, tetrakis(triphenylphosphine)palladium (1.16 g, 1.0 mmol) was added, and the mixture was stirred, heated and reacted for 8.5 h. After the reaction was finished, the mixture was cooled to room temperature, a solvent was concentrated by distillation at reduced pressure, a filter cake was washed with ethanol after vacuum filtration, and the obtained filter cake was recrystallized with toluene to obtain Intermediate C-143 (25.99 g, with a yield of 65%) with an HPLC purity of ≥99.80%. Mass spectrometry (m/z): 399.0584 (theoretical value: 399.0597).

According to the above method for preparing Intermediate C-143, the raw material b-143 and the raw material d-143 in Synthesis Example 1 were replaced with the raw materials b and the raw materials d in the table to synthesize the following Intermediates C:

Synthesis Example 2: Preparation of Compound 1

Preparation of D-1:

Preparation of E-1:

Preparation of Compound 1:

Synthesis Example 3: Preparation of Compound 17

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-17, B-17 and C-17, respectively, and other steps were the same to obtain Compound 17 (19.21 g) with a solid purity of ≥99.90% detected by HPLC. Mass spectrometry (m/z): 609.2588 (theoretical value: 609.2600). Theoretical element content (%) of C42H35N3Si:C, 82.72; H, 5.79; N, 6.89. Measured element content (%): C, 82.75; H, 5.76; N, 6.87.

Synthesis Example 4: Preparation of Compound 31

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, C-1 was replaced with equal molar C-31, and other steps were the same to obtain Compound 31 (20.92 g) with a solid purity of ≥99.93% detected by HPLC. Mass spectrometry (m/z): 685.2901 (theoretical value: 685.2913). Theoretical element content (%) of C48H39N3Si:C, 84.05; H, 5.73; N, 6.13. Measured element content (%): C, 84.08; H, 5.77; N, 6.09.

Synthesis Example 5: Preparation of Compound 63

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-63, B-63 and C-63, respectively, and other steps were the same to obtain Compound 63 (26.35 g) with a solid purity of ≥99.90% detected by HPLC. Mass spectrometry (m/z): 877.3872 (theoretical value: 877.3852). Theoretical element content (%) of C63H51N3Si:C, 86.16; H, 5.85; N, 4.78. Measured element content (%): C, 86.11; H, 5.83; N, 4.75.

Synthesis Example 6: Preparation of Compound 74

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-74 and C-31, respectively, and other steps were the same to obtain Compound 74 (17.35 g) with a solid purity of ≥99.98% detected by HPLC. Mass spectrometry (m/z): 533.2269 (theoretical value: 533.2287). Theoretical element content (%) of C36H31N3Si:C, 81.01; H, 5.85; N, 7.87. Measured element content (%): C, 81.05; H, 5.86; N, 7.85.

Synthesis Example 7: Preparation of Compound 76

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-76, B-76 and C-76, respectively, and other steps were the same to obtain Compound 76 (22.20 g) with a solid purity of ≥99.92% detected by HPLC. Mass spectrometry (m/z): 727.3363 (theoretical value: 727.3383). Theoretical element content (%) of C51H45N3Si:C, 84.14; H, 6.23; N, 5.77. Measured element content (%): C, 84.18; H, 6.20; N, 5.74.

Synthesis Example 8: Preparation of Compound 99

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-63, B-99 and C-99, respectively, and other steps were the same to obtain Compound 99 (19.64 g) with a solid purity of ≥99.97% detected by HPLC. Mass spectrometry (m/z): 609.2589 (theoretical value: 609.2600). Theoretical element content (%) of C42H35N3Si:C, 82.72; H, 5.79; N, 6.89. Measured element content (%): C, 82.69; H, 5.83; N, 6.90.

Synthesis Example 9: Preparation of Compound 126

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-126, B-126 and C-126, respectively, and other steps were the same to obtain Compound 126 (20.20 g) with a solid purity of ≥99.94% detected by HPLC. Mass spectrometry (m/z): 651.3083 (theoretical value: 651.3070). Theoretical element content (%) of C45H41N3Si:C, 82.91; H, 6.34; N, 6.45. Measured element content (%): C, 82.95; H, 6.30; N, 6.47.

Synthesis Example 10: Preparation of Compound 133

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-133 and C-133, respectively, and other steps were the same to obtain Compound 133 (18.61 g) with a solid purity of ≥99.91% detected by HPLC. Mass spectrometry (m/z): 590.2875 (theoretical value: 590.2883). Theoretical element content (%) of C40H26D7N3Si:C, 81.31; H, 6.82; N, 7.11. Measured element content (%): C, 81.32; H, 6.86; N, 7.07.

Synthesis Example 11: Preparation of Compound 136

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-99 and C-136, respectively, and other steps were the same to obtain Compound 136 (20.28 g) with a solid purity of ≥99.93% detected by HPLC. Mass spectrometry (m/z): 643.3399 (theoretical value: 643.3383). Theoretical element content (%) of C44H45N3Si:C, 82.07; H, 7.04; N, 6.53. Measured element content (%): C, 82.03; H, 7.05; N, 6.50.

Synthesis Example 12: Preparation of Compound 139

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-99 and C-139, respectively, and other steps were the same to obtain Compound 139 (21.67 g) with a solid purity of ≥99.87% detected by HPLC. Mass spectrometry (m/z): 677.3057 (theoretical value: 677.3078). Theoretical element content (%) of C42H47N3Si3:C, 74.39; H, 6.99; N, 6.20. Measured element content (%): C, 74.42; H, 6.95; N, 6.23.

Synthesis Example 13: Preparation of Compound 143

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-63, B-133 and C-143, respectively, and other steps were the same to obtain Compound 143 (20.97 g) with a solid purity of ≥99.90% detected by HPLC. Mass spectrometry (m/z): 665.2315 (theoretical value: 665.2321). Theoretical element content (%) of C44H35N3Si3: C, 79.36; H, 5.30; N, 6.31. Measured element content (%): C, 79.32; H, 5.27; N, 6.35.

Synthesis Example 14: Preparation of Compound 154

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-99 and C-154, respectively, and other steps were the same to obtain Compound 154 (19.31 g) with a solid purity of ≥99.92% detected by HPLC. Mass spectrometry (m/z): 622.2459 (theoretical value: 622.2440). Theoretical element content (%) of C43H34N3OSi:C, 82.92; H, 5.50; N, 4.50. Measured element content (%): C, 82.90; H, 5.48; N, 4.55.

Synthesis Example 15: Preparation of Compound 159

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-99 and C-159, respectively, and other steps were the same to obtain Compound 159 (24.15 g) with a solid purity of ≥99.87% detected by HPLC. Mass spectrometry (m/z): 791.2775 (theoretical value: 791.2790). Theoretical element content (%) of C54H41N3SSi:C, 81.88; H, 5.22; N, 5.31. Measured element content (%): C, 81.85; H, 5.20; N, 5.27.

Synthesis Example 16: Preparation of Compound 160

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-99 and C-160, respectively, and other steps were the same to obtain Compound 160 (20.21 g) with a solid purity of ≥99.85% detected by HPLC. Mass spectrometry (m/z): 673.2568 (theoretical value: 673.2549). Theoretical element content (%) of C46H35N3OSi:C, 81.99; H, 5.24; N, 6.24. Measured element content (%): C, 82.03; H, 5.20; N, 6.22.

Synthesis Example 17: Preparation of Compound 173

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-63, B-99 and C-173, respectively, and other steps were the same to obtain Compound 173 (23.58 g) with a solid purity of ≥99.92% detected by HPLC. Mass spectrometry (m/z): 785.3238 (theoretical value: 785.3226). Theoretical element content (%) of C56H43N3Si:C, 85.57; H, 5.51; N, 5.35. Measured element content (%): C, 85.55; H, 5.48; N, 5.39.

Synthesis Example 18: Preparation of Compound 175

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-175, B-175 and C-31, respectively, and other steps were the same to obtain Compound 175 (17.07 g) with a solid purity of ≥99.90% detected by HPLC. Mass spectrometry (m/z): 560.2122 (theoretical value: 560.2145). Theoretical element content (%) of C35H28N6Si:C, 74.97; H, 5.03; N, 14.99. Measured element content (%): C, 74.93; H, 5.08; N, 14.95.

Synthesis Example 19: Preparation of Compound 184

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-184, B-99 and C-31, respectively, and other steps were the same to obtain Compound 184 (17.51 g) with a solid purity of ≥99.93% detected by HPLC. Mass spectrometry (m/z): 583.2460 (theoretical value: 583.2444). Theoretical element content (%) of C40H33N3Si:C, 82.29; H, 5.70; N, 7.20. Measured element content (%): C, 82.25; H, 5.73; N, 7.17.

Synthesis Example 20: Preparation of Compound 222

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-222, B-222 and C-222, respectively, and other steps were the same to obtain Compound 222 (19.43 g) with a solid purity of ≥99.82% detected by HPLC. Mass spectrometry (m/z): 681.2035 (theoretical value: 681.2019). Theoretical element content (%) of C42H31N5OSSi:C, 73.98; H, 4.58; N, 10.27. Measured element content (%): C, 73.95; H, 4.62; N, 10.23.

Synthesis Example 21: Preparation of Compound 225

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-225 and C-139, respectively, and other steps were the same to obtain Compound 225 (22.57 g) with a solid purity of ≥99.94% detected by HPLC. Mass spectrometry (m/z): 739.3759 (theoretical value: 739.3778). Theoretical element content (%) of C49H53N3Si2: C, 79.52; H, 7.22; N, 5.68. Measured element content (%): C, 79.47; H, 7.25; N, 5.70.

Synthesis Example 22: Preparation of Compound 233

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, B-1 and C-1 were replaced with equal molar B-99 and C-31, respectively, and other steps were the same to obtain Compound 233 (19.82 g) with a solid purity of ≥99.98% detected by HPLC. Mass spectrometry (m/z): 609.2605 (theoretical value: 609.2600). Theoretical element content (%) of C42H35N3Si:C, 82.72; H, 5.79; N, 6.89. Measured element content (%): C, 82.75; H, 5.76; N, 6.93.

Synthesis Example 23: Preparation of Compound 240

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-240 and C-31, respectively, and other steps were the same to obtain Compound 240 (19.82 g) with a solid purity of ≥99.96% detected by HPLC. Mass spectrometry (m/z): 609.2590 (theoretical value: 609.2600). Theoretical element content (%) of C42H35N3Si:C, 82.72; H, 5.79; N, 6.89. Measured element content (%): C, 82.75; H, 5.75; N, 6.93.

Synthesis Example 24: Preparation of Compound 258

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-258, B-258 and C-31, respectively, and other steps were the same to obtain Compound 258 (18.53 g) with a solid purity of ≥99.94% detected by HPLC. Mass spectrometry (m/z): 617.3117 (theoretical value: 617.3102). Theoretical element content (%) of C42H27D8N3Si:C, 81.64; H, 7.01; N, 6.80. Measured element content (%): C, 81.60; H, 7.05; N, 6.82.

Synthesis Example 25: Preparation of Compound 264

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-240 and C-264, respectively, and other steps were the same to obtain Compound 264 (18.60 g) with a solid purity of ≥99.89% detected by HPLC. Mass spectrometry (m/z): 619.3239 (theoretical value: 619.3228). Theoretical element content (%) of C42H25D10N3Si:C, 81.38; H, 7.31; N, 6.78. Measured element content (%): C, 81.35; H, 7.34; N, 6.75.

Synthesis Example 26: Preparation of Compound 285

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-63, B-285 and C-285, respectively, and other steps were the same to obtain Compound 285 (20.64 g) with a solid purity of ≥99.86% detected by HPLC. Mass spectrometry (m/z): 699.3051 (theoretical value: 699.3070). Theoretical element content (%) of C49H41N3Si:C, 84.08; H, 5.90; N, 6.00. Measured element content (%): C, 84.05; H, 5.92; N, 6.04.

Synthesis Example 27: Preparation of Compound 298

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, B-1 and C-1 were replaced with equal molar B-99 and C-298, respectively, and other steps were the same to obtain Compound 298 (21.04 g) with a solid purity of ≥99.95% detected by HPLC. Mass spectrometry (m/z): 689.2480 (theoretical value: 689.2499). Theoretical element content (%) of C46H35N3O2Si:C, 80.09; H, 5.11; N, 6.09. Measured element content (%): C, 80.12; H, 5.06; N, 6.13.

Synthesis Example 28: Preparation of Compound 308

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-308, B-74 and C-308, respectively, and other steps were the same to obtain Compound 308 (20.48 g) with a solid purity of ≥99.92% detected by HPLC. Mass spectrometry (m/z): 660.2716 (theoretical value: 660.2709). Theoretical element content (%) of C45H36N4Si:C, 81.78; H, 5.49; N, 8.48. Measured element content (%): C, 81.82; H, 5.52; N, 8.50.

Synthesis Example 29: Preparation of Compound 316

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, B-1 and C-1 were replaced with equal molar B-99 and C-316, respectively, and other steps were the same to obtain Compound 316 (20.99 g) with a solid purity of ≥99.95% detected by HPLC. Mass spectrometry (m/z): 699.2689 (theoretical value: 699.2706). Theoretical element content (%) of C48H37N3OSi:C, 82.37; H, 5.33; N, 6.00. Measured element content (%): C, 82.40; H, 5.35; N, 6.05.

Synthesis Example 30: Preparation of Compound 328

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-328, B-328 and C-328, respectively, and other steps were the same to obtain Compound 328 (24.11 g) with a solid purity of ≥99.80% detected by HPLC. Mass spectrometry (m/z): 860.4255 (theoretical value: 860.4274). Theoretical element content (%) of C60H56N4Si:C, 83.68; H, 6.55; N, 6.51. Measured element content (%): C, 83.65; H, 6.50; N, 6.47.

Synthesis Example 31: Preparation of Compound 337

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-337, B-337 and C-337, respectively, and other steps were the same to obtain Compound 337 (22.20 g) with a solid purity of ≥99.83% detected by HPLC. Mass spectrometry (m/z): 704.2914 (theoretical value: 704.2909). Theoretical element content (%) of C47H32D4N4OSi:C, 80.08; H, 5.72; N, 7.95. Measured element content (%): C, 80.12; H, 5.75; N, 7.99.

Synthesis Example 32: Preparation of Compound 340

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, B-1 and C-1 were replaced with equal molar B-340 and C-340, respectively, and other steps were the same to obtain Compound 340 (21.85 g) with a solid purity of ≥99.93% detected by HPLC. Mass spectrometry (m/z): 682.2930 (theoretical value: 682.2948). Theoretical element content (%) of C44H42N4Si2: C, 77.37; H, 6.20; N, 8.20. Measured element content (%): C, 77.41; H, 6.22; N, 8.16.

Synthesis Example 33: Preparation of Compound 367

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, B-i and C-i were replaced with equal molar B-367 and C-367, respectively, and other steps were the same to obtain Compound 367 (25.05 g) with a solid purity of ≥99.91% detected by HPLC. Mass spectrometry (m/z): 889.4253 (theoretical value: 889.4248). Theoretical element content (% o) of C61H59N3Si2: C, 82.29; H, 6.68; N, 4.72. Measured element content (% o): C, 82.33; H, 6.65; N, 4.75.

Synthesis Example 34: Preparation of Compound 373

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-222 and C-373, respectively, and other steps were the same to obtain Compound 373 (20.19 g) with a solid purity of ≥99.93% detected by HPLC. Mass spectrometry (m/z): 659.2740 (theoretical value: 659.2757). Theoretical element content (%) of C46H37N3Si:C, 83.72; H, 5.65; N, 6.37. Measured element content (%): C, 83.75; H, 5.62; N, 6.34.

Synthesis Example 35: Preparation of Compound 415

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-63, B-415 and C-415, respectively, and other steps were the same to obtain Compound 415 (21.64 g) with a solid purity of ≥99.89% detected by HPLC. Mass spectrometry (m/z): 695.2780 (theoretical value: 695.2788). Theoretical element content (%) of C45H41N3OSi2: C, 77.66; H, 5.94; N, 6.04. Measured element content (%): C, 77.69; H, 5.90; N, 6.07.

Synthesis Example 36: Preparation of Compound 425

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, B-1 and C-1 were replaced with equal molar B-425 and C-139, respectively, and other steps were the same to obtain Compound 425 (23.42 g) with a solid purity of ≥99.94% detected by HPLC. Mass spectrometry (m/z): 731.3134 (theoretical value: 731.3152). Theoretical element content (%) of C49H45N3Si2: C, 80.39; H, 6.20; N, 5.74. Measured element content (%): C, 80.42; H, 6.17; N, 5.78.

Synthesis Example 37: Preparation of Compound 442

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-442 and C-442, respectively, and other steps were the same to obtain Compound 442 (20.61 g) with a solid purity of ≥99.96% detected by HPLC. Mass spectrometry (m/z): 633.2612 (theoretical value: 633.2600). Theoretical element content (%) of C44H35N3Si:C, 83.37; H, 5.57; N, 6.63. Measured element content (%): C, 83.35; H, 5.60; N, 6.64.

Synthesis Example 38: Preparation of Compound 455

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-74, B-455 and C-99, respectively, and other steps were the same to obtain Compound 455 (23.58 g) with a solid purity of ≥99.83% detected by HPLC. Mass spectrometry (m/z): 785.3208 (theoretical value: 785.3226). Theoretical element content (%) of C56H43N3Si:C, 85.57; H, 5.51; N, 5.35. Measured element content (%): C, 85.60; H, 5.55; N, 5.32.

Synthesis Example 39: Preparation of Compound 467

According to the same preparation method as the method for preparing Compound 1 in Synthesis Example 2, A-1, B-1 and C-1 were replaced with equal molar A-467, B-467 and C-467, respectively, and other steps were the same to obtain Compound 467 (21.71 g) with a solid purity of ≥99.86% detected by HPLC. Mass spectrometry (m/z): 723.3085 (theoretical value: 723.3070). Theoretical element content (%) of C51H41N3Si:C, 84.61; H, 5.71; N, 5.80. Measured element content (%): C, 84.58; H, 5.75; N, 5.76.

Device Example

The following describes the application effect of the OLED material synthesized in the present disclosure in the organic electroluminescent device in detail by using the device examples and the comparative device examples. It is to be understood that these examples are merely an explanation of the present disclosure, and are not intended to limit the scope of the present disclosure.

Test method: the driving voltage and the luminescence efficiency were tested using a combined IVL test system composed of test software, a computer, a K2400 digital source meter manufactured by Keithley, USA and a PR788 spectral scanning photometer manufactured by Photo Research, USA. The lifetime was tested using an M6000 OLED lifetime test system manufactured by McScience. The test was conducted in an atmospheric environment and at room temperature.

The materials used in preparing the organic electroluminescent devices and comparative devices are as follows:

Device Example 1-1: Preparation of a Green Light Organic Electroluminescent Device

An ITO transparent glass substrate was ultrasonically cleaned twice with a 5% glass cleaning solution, 20 minutes each time, and then ultrasonically cleaned twice with deionized water, 10 minutes each time. The ITO transparent glass substrate was ultrasonically cleaned for 20 minutes with acetone and isopropyltone in sequence and dried at 120° C. All organic materials were sublimated, each with a purity above 99.99%. A mixed material (mass ratio of HI—P:HT-1=3:97) of HI—P and HT-1 was vacuum evaporated on the ITO transparent glass substrate as a hole injection layer with a thickness of evaporation of 10 nm. HT-1 with a thickness of 120 nm was vacuum evaporated on the hole injection layer as a hole transport layer. A mixed material (mass ratio of GH-2:GH-1:GD-1=46:46:8) of GH-2, GH-1 and GD-1 was evaporated on the hole transport layer to form a light-emitting layer with a thickness of evaporation of 40 nm. Then, a mixed material (mass ratio of Compound 1:Liq=1:1) of Compound 1 and Liq in the present disclosure was vacuum evaporated on the light-emitting layer as an electron transport layer with a thickness of evaporation of 30 nm. Then, LiF with a thickness of 1 nm was evaporated as an electron injection layer. Al was vacuum evaporated on the electron injection layer as a cathode with a thickness of evaporation of 120 nm.

Device Examples 1-2 to 1-38: Preparation of Green Light Organic Electroluminescent Devices

Comparative Device Examples 1 to 3

Compound 1 in Device Example 1-1 was replaced with Comparative Compound 1, Comparative Compound 2 and Comparative Compound 7 as electron transport layers, and other manufacturing processes were completely the same to prepare the organic electroluminescent devices.

According to the results in Table 1, the heterocyclic compound provided in the present disclosure has a relatively good electron mobility, which can effectively balance transport of holes and electrons and improve the luminescence efficiency, and the heterocyclic compound provided in the present disclosure has a proper energy level, which can reduce injection and transport barriers of the electrons, reduce the drive voltage, avoid the increase of the power consumption of the device due to an excessively high local voltage and prolong the service life of the device.

Device Example 2-1: Preparation of a Green Light Organic Electroluminescent Device

A mixed material (mass ratio of HI—P:HT-1=3:97) of HI—P and HT-1 was vacuum evaporated on the cleaned ITO transparent glass substrate as a hole injection layer with a thickness of evaporation of 10 nm. HT-1 with a thickness of 120 nm was vacuum evaporated on the hole injection layer as a hole transport layer. A mixed material (mass ratio of GH-2:GH-1:GD-1=46:46:8) of GH-2, GH-1 and GD-1 was evaporated on the hole transport layer to form a light-emitting layer with a thickness of evaporation of 40 nm. Then, Compound 1 in the present disclosure was vacuum evaporated on the light-emitting layer as a hole blocking layer with a thickness of evaporation of 10 nm. Then, a mixed material (mass ratio of ET-1:Liq=1:1) of ET-1 and Liq was vacuum evaporated on the hole blocking layer as an electron transport layer with a thickness of evaporation of 30 nm. Then, LiF with a thickness of 1 nm was evaporated as an electron injection layer. Al was vacuum evaporated on the electron injection layer as a cathode with a thickness of evaporation of 120 nm.

Device Examples 2-2 to 2-20: Preparation of Green Light Organic Electroluminescent Devices

Compound 1 in Device Example 2-1 was replaced with Compound 31, Compound 74, Compound 99, Compound 139, Compound 159, Compound 184, Compound 225, Compound 233, Compound 258, Compound 285, Compound 298, Compound 308, Compound 316, Compound 337, Compound 340, Compound 373, Compound 425, Compound 442 and Compound 455 in the present disclosure as hole blocking layers, and other manufacturing processes were completely the same to prepare the organic electroluminescent devices.

Comparative Device Examples 4 to 6

Compound 1 in Device Example 2-1 was replaced with Comparative Compound 2 and Comparative Compound 3 as hole blocking layers, and other manufacturing processes were completely the same to prepare the organic electroluminescent devices.

According to the results in Table 2, the heterocyclic compound provided in the present disclosure has a proper energy level, which can effectively confine the holes in the light-emitting layer, avoid the escape of the holes to one side of the electron transport layer, reduce a probability of recombination at an interface of the light-emitting layer, improve an effective recombination rate of excitons, improve the luminescence efficiency, avoid a leakage current phenomenon and prolong the lifetime of the device.

Device Example 3-1: Preparation of a Red Light Organic Electroluminescent Device

A mixed material (mass ratio of HI—P:HT-1=3:97) of HI—P and HT-1 was vacuum evaporated on the cleaned ITO transparent glass substrate as a hole injection layer with a thickness of evaporation of 10 nm. HT-1 with a thickness of 120 nm was vacuum evaporated on the hole injection layer as a hole transport layer. A mixed material (mass ratio of Compound 1:RH-1:RD-1 in the present disclosure=49:49:2) of Compound 1, RH-1 and RD-1 in the present disclosure was evaporated on the hole transport layer to form a light-emitting layer with a thickness of evaporation of 30 nm. Then, a mixed material (mass ratio of ET-1:Liq=1:1) of ET-1 and Liq was vacuum evaporated on the light-emitting layer as an electron transport layer with a thickness of evaporation of 30 nm. Then, LiF with a thickness of 1 nm was evaporated as an electron injection layer. Al was vacuum evaporated on the electron injection layer as a cathode with a thickness of evaporation of 120 nm.

Device Examples 3-2 to 3-30: Preparation of Red Light Organic Electroluminescent Devices

Compound 1 in Device Example 3-1 was replaced with Compound 17, Compound 31, Compound 63, Compound 74, Compound 99, Compound 126, Compound 133, Compound 136, Compound 139, Compound 143, Compound 154, Compound 159, Compound 173, Compound 175, Compound 184, Compound 225, Compound 233, Compound 240, Compound 258, Compound 264, Compound 298, Compound 308, Compound 316, Compound 337, Compound 340, Compound 367, Compound 373, Compound 425 and Compound 442 in the present disclosure as red light host materials, and other manufacturing processes were completely the same to prepare the organic electroluminescent devices.

Comparative Device Examples 6 to 8

Compound 1 in Device Example 3-1 was replaced with Comparative Compound 1, Comparative Compound 5 and Comparative Compound 7 as red light host materials, and other manufacturing processes were completely the same to prepare the organic electroluminescent devices.

According to the results in Table 3, the heterocyclic compound provided in the present disclosure has a proper energy level, which can match with an energy level of an adjacent functional layer, balance transport of electrons and holes and reduce injection barriers of the holes and the electrons so that the holes and the electrons are effectively recombined in the light-emitting layer, thereby reducing the drive voltage, improving the luminescence efficiency and prolonging the lifetime of the device.

Device Example 4-1: Preparation of a Blue Light Organic Electroluminescent Device

A mixed material (mass ratio of HI—P:HT-1=3:97) of HI—P and HT-1 was vacuum evaporated on the cleaned and dried ITO/Ag/ITO glass substrate as a hole injection layer with a thickness of evaporation of 10 nm. HT-1 with a thickness of 120 nm was vacuum evaporated on the hole injection layer as a hole transport layer. A mixed material (mass ratio of BH-1:BD-1=98:2) of BH-1 and BD-1 was evaporated on the hole transport layer to form a light-emitting layer with a thickness of evaporation of 20 nm. Then, a mixed material (mass ratio of ET-1:Liq=1:1) of ET-1 and Liq was vacuum evaporated on the light-emitting layer as an electron transport layer with a thickness of evaporation of 30 nm. Then, Yb with a thickness of 1 nm was evaporated as an electron injection layer. A Mg:Ag alloy (mass ratio of Mg:Ag=1:9) was vacuum evaporated on the electron injection layer as a cathode with a thickness of evaporation of 13 nm. Then, Compound 31 in the present disclosure was vacuum evaporated on the cathode as a light extraction layer with a thickness of evaporation of 75 nm.

Device Examples 4-2 to 4-10: Preparation of Blue Light Organic Electroluminescent Devices

Compound 31 in Device Example 4-1 was replaced with Compound 74, Compound 139, Compound 160, Compound 233, Compound 264, Compound 298, Compound 316, Compound 337 and Compound 415 in the present disclosure as materials of light extraction layers, and other manufacturing processes were completely the same to prepare the organic electroluminescent devices.

Comparative Device Example 9

Compound 31 in Device Example 4-1 was replaced with Comparative Compound 6 as a material of a light extraction layer, and other manufacturing processes were completely the same to prepare the organic electroluminescent device.

According to the results in Table 4, when the heterocyclic compound provided in the present disclosure is applied to the light extraction layer, the luminescence efficiency of the organic electroluminescent device can be improved, and the lifetime of the device can be prolonged.

It is to be noted that although the present disclosure has been particularly described through particular embodiments, those of ordinary skill in the art can make various modifications in form or detail without departing from the principle of the present disclosure and such modifications also fall within the scope of the present disclosure.