Heterocyclic compound and organic electroluminescent device comprising same
Provided are a heterocyclic compound and an organic electroluminescent device comprising the same, which relate to the field of organic electroluminescent technologies. The heterocyclic compound has advantages of good film-forming property, good thermal stability, and relatively high glass-transition temperature, and the service life of the device can be prolonged when the heterocyclic compound is applied to an organic layer of the organic electroluminescent device; meanwhile, the structure has a deep HOMO energy level so that holes can be effectively prevented from diffusing from the emissive layer to the electron transport layer and the recombination probability of the holes and electrons in the emissive layer can be effectively improved; and when the heterocyclic compound is applied to the electron transport layer or hole blocking layer, the luminous efficiency of the device can be effectively improved.
1. A heterocyclic compound, having a structure as shown in Formula I:
wherein, in the structure as shown in Formula I, Ar 1 is selected from a structure as shown in Formula II, and Ar 2 and Ar 3 are identical to each other or different from each other and independently selected from a structure as shown in Formula III;
wherein L 1 is independently selected from a single bond or any one of the following groups:
wherein n 1 is an integer selected from 1 to 4;
L 2 to L 3 are identical to each other or different from each other and independently selected from any one of a single bond, substituted or unsubstituted C6 to C30 arylene or substituted or unsubstituted C3 to C30 heteroarylene;
* is the attachment site between L 1 and Ar 1 , the attachment site between L 2 and Ar 2 is any position on the structure as shown in Formula III, and the attachment site between L 3 and Ar 3 is any position on the structure as shown in Formula III;
in the structure as shown in Formula II, R 1 and R 2 are identical to each other or different from each other and independently selected from any one of hydrogen, C1 to C12 alkyl, substituted or unsubstituted phenyl, or R 1 and R 2 are joined to form a substituted or unsubstituted ring, wherein substituted refers to mono- or multi-substitution with any of the following groups: deuterium, methyl, ethyl, tert-butyl, phenyl, biphenyl or naphthyl;
R 3 is selected from any one of hydrogen, deuterium, halogen, cyano, hydroxyl, amino, sulfanyl, adamantyl, norcamphanyl, substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted C2 to C12 alkenyl or substituted or unsubstituted C6 to C30 aryl;
m 1 is an integer selected from 0 to 4, and when m 1 is greater than 1, two or more R 3 are identical to each other or different from each other, or two adjacent R 3 are joined to form a ring; and
wherein the structure as shown in Formula III is selected from any one of the following groups:
2. The heterocyclic compound according to claim 1 , wherein the structure as shown in Formula II is selected from any one of structures as shown in Formula II-1 to Formula II-4:
wherein, * represents an attachment site to L 1 ;
R 5 and R 6 are identical to each other or different from each other and independently selected from any one of hydrogen, methyl, ethyl or phenyl;
R 7 is selected from any one of hydrogen, deuterium, cyano, adamantyl, norcamphanyl, substituted or unsubstituted C1 to C6 alkyl or substituted or unsubstituted C6 to C18 aryl;
m 3 is an integer selected from 0 to 4, and when m 3 is greater than 1, two or more R 7 are identical to each other or different from each other;
ring E is selected from any one of the following structures:
wherein, * represents a fusion site; and
X 2 is selected from any one of C—R 8 R 9 , N—R 10 , O or S;
R 8 and R 9 are identical to each other or different from each other and independently selected from any one of hydrogen, substituted or unsubstituted C1 to C12 alkyl or substituted or unsubstituted C6 to C30 aryl; and
R 10 is selected from any one of substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted C6 to C30 aryl or substituted or unsubstituted C3 to C30 heteroaryl.
3. The heterocyclic compound according to claim 1 , wherein the structure as shown in Formula II is selected from any one of the following groups:
4. The heterocyclic compound according to claim 1 , wherein L 2 and L 3 are identical to each other or different from each other and independently selected from a single bond or any one of the following groups:
wherein n 1 is an integer selected from 1 to 4.
5. The heterocyclic compound according to claim 1 , wherein the structure as shown in Formula I is selected from any one of the following structures:
6. An organic electroluminescent device, comprising an anode, a cathode, and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a heterocyclic compound of Formula 1.
7. The organic electroluminescent device according to claim 6 , wherein the organic layer comprises a hole blocking layer and an electron transport layer, wherein the electron transport layer or the hole blocking layer comprises the heterocyclic compound as shown in Formula 1.