PLURALITY OF HOST MATERIALS, ORGANIC ELECTROLUMINESCENT COMPOUND, AND ORGANIC ELECTROLUMINESCENT DEVICE COMPRISING THE SAME
The present disclosure relates to a plurality of host materials, an organic electroluminescent compound, and an organic electroluminescent device comprising the same. By comprising the specific combination of the compounds according to the present disclosure as a plurality of host materials, or by comprising the compound according to the present disclosure, an organic electroluminescent device with low driving voltage and/or long lifespan characteristics can be provided, compared to a conventional organic electroluminescent device.
1 . A plurality of host materials comprising at least one first host compound and at least one second host compound, wherein the first host compound is represented by the following Formula 1, the second host compound is represented by the following Formula 2, and at least one of the first host compound and the second host compound includes at least one deuterium.
wherein,
Ar 1 to Ar 3 each independently represent, a substituted or unsubstituted (C6-C30)aryl or a substituted or unsubstituted (3- to 30-membered)heteroaryl; provided that at least one of Ar 1 to Ar 3 is a carbazole group represented by the following Formula 1-1;
wherein,
L 1 represents a single bond or (C6-C30)arylene unsubstituted or substituted with deuterium;
R 1 to R 8 each independently represent, hydrogen, deuterium, or (C6-C30)aryl unsubstituted or substituted with deuterium, (C1-C30)alkyl, (C6-C30)aryl, or a combination thereof; provided that at least one of R 1 to R 4 is represented by the following formulas 1-11 or 1-12;
wherein,
L 11 represents a single bond or (C6-C30)arylene unsubstituted or substituted with deuterium;
R 10 and R 15 to R 17 each independently represent, hydrogen, deuterium, or (C6-C30)aryl unsubstituted or substituted with deuterium;
a to c each independently represent, an integer of 1 to 4; d is an integer of 1 to 3; a′ and b′ each independently represent, an integer of 1 to 5; when a to d, a′, and b′ are 2 or more, each of R 10 and each of R 15 to each of R 1 may be the same or different;
* represents a linking site with R 1 to R 4 ;
wherein,
A 1 and A 2 each independently represent, (C6-C30)aryl unsubstituted or substituted with deuterium, a substituted or unsubstituted dibenzofuranyl, a substituted or unsubstituted dibenzothiophenyl, or a substituted or unsubstituted carbazolyl;
X 11 to X 26 each independently represent hydrogen, deuterium, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; or may be linked to the adjacent substituents to form a ring(s); and
any one of X 15 to X 18 is linked to any one of X 19 to X 22 .
2 . The plurality of host materials according to claim 1 , wherein Ar 1 to Ar 3 in Formula 1 each independently represent, phenyl unsubstituted or substituted with deuterium, biphenyl unsubstituted or substituted with deuterium, terphenyl unsubstituted or substituted with deuterium, quarterphenyl unsubstituted or substituted with deuterium, naphthyl unsubstituted or substituted with deuterium, phenylnaphthyl unsubstituted or substituted with deuterium, naphthylphenyl unsubstituted or substituted with deuterium, dibenzofuranyl unsubstituted or substituted with deuterium, dibenzothiophenyl unsubstituted or substituted with deuterium, carbazolyl unsubstituted or substituted with deuterium, or a combination thereof.
3 . The plurality of host materials according to claim 1 , wherein R 1 to R 8 in Formula 1-1 each independently represent, hydrogen, deuterium, phenyl unsubstituted or substituted with deuterium, biphenyl unsubstituted or substituted with deuterium, terphenyl unsubstituted or substituted with deuterium, quarterphenyl unsubstituted or substituted with deuterium, naphthyl unsubstituted or substituted with deuterium, phenylnaphthyl unsubstituted or substituted with deuterium, naphthylphenyl unsubstituted or substituted with deuterium, or a combination thereof.
4 . The plurality of host materials according to claim 1 , wherein R 2 in Formula 1-1 is represented by the following formulas 1-11-1 or 1-12-1.
wherein,
L 11 , R 10 , R 15 to R 17 , a to d, a′, and b′ are as defined in claim 1 .
5 . The plurality of host materials according to claim 1 , wherein R 3 in Formula 1-1 is represented by the following formulas 1-11-1 or 1-12-1.
wherein,
L 11 , R 10 , R 15 to R 17 , a to d, a′, and b′ are as defined in claim 1 .
6 . The plurality of host materials according to claim 1 , wherein at least one of L 1 and R 1 to R 8 in Formula 1-1 includes deuterium.
7 . The plurality of host materials according to claim 1 , wherein at least one of X 11 , X 18 , X 19 and X 26 in Formula 2 is deuterium.
8 . The plurality of host materials according to claim 1 , wherein the deuterium substitution rate in Formula 2 is 40% to 100%.
9 . The plurality of host materials according to claim 1 , wherein the deuterium substitution rate of X 11 to X 26 in Formula 2 is 25% to 100%.
10 . The plurality of host materials according to claim 1 , wherein the Formula 2 is represented by any one of the following formulas 2-1 to 2-8:
wherein,
A 1 , A 2 and X 11 to X 26 are as defined in claim 1 .
11 . The plurality of host materials according to claim 1 , wherein A 1 and A 2 in Formula 2 each independently represent, phenyl unsubstituted or substituted with deuterium, biphenyl unsubstituted or substituted with deuterium, terphenyl unsubstituted or substituted with deuterium, naphthyl unsubstituted or substituted with deuterium, fluorenyl unsubstituted or substituted with deuterium, benzofluorenyl unsubstituted or substituted with deuterium, triphenylenyl unsubstituted or substituted with deuterium, fluoranthenyl unsubstituted or substituted with deuterium, phenanthrenyl unsubstituted or substituted with deuterium, dibenzofuranyl unsubstituted or substituted with deuterium, carbazolyl unsubstituted or substituted with deuterium, dibenzothiophenyl unsubstituted or substituted with deuterium, or a combination thereof.
12 . The plurality of host materials according to claim 1 , wherein the first host compound represented by the Formula 1 is selected from the following compounds:
In the compounds above, Dn means that n number of hydrogens is replaced with deuterium, wherein n represents an integer of 1 or more and the upper limit of n is determined by the number of hydrogens that can be substituted in each compound.
13 . The plurality of host materials according to claim 1 , wherein the compound represented by the Formula 2 is selected from the following compounds:
In the compounds above, Dn means that n number of hydrogens is replaced with deuterium, wherein n represents an integer of 1 or more and the upper limit of n is determined by the number of hydrogens that can be substituted in each compound.
14 . An organic electroluminescent device comprising: a first electrode; a second electrode; and at least one light-emitting layer(s) between the first electrode and the second electrode, wherein the at least one light-emitting layer(s) comprises the plurality of host materials according to claim 1 .
15 . An organic electroluminescent compound represented by the following Formula 1′:
wherein,
Ar 1 and Ar 2 each independently represent, a substituted or unsubstituted (C6-C30)aryl or a substituted or unsubstituted (3- to 30-membered)heteroaryl;
Ar 3 is a carbazole group represented by the following Formula 1-1;
wherein,
L 1 represents a single bond or (C6-C30)arylene unsubstituted or substituted with deuterium;
R 1 to R 8 each independently represent, hydrogen, deuterium, or (C6-C30)aryl unsubstituted or substituted with deuterium, (C1-C30)alkyl, (C6-C30)aryl, or a combination thereof; provided that at least one of R 1 to R 4 is represented by the following Formula 1-11;
wherein,
L 11 represents a single bond or (C6-C30)arylene unsubstituted or substituted with deuterium;
R 10 and R 15 to R 17 each independently represent, hydrogen, deuterium, or (C6-C30)aryl unsubstituted or substituted with deuterium; and
a to c each independently represent, an integer of 1 to 4; and d is an integer of 1 to 3;
when a to d are 2 or more, each of R 10 and each of R 15 to each of R 17 may be the same or different;
provided that the following compound is excluded from the Formula 1′.
16 . The organic electroluminescent compound according to claim 15 , wherein the organic electroluminescent compound represented by Formula 1′ satisfies the following <Condition 1> or <Condition 2>:
<Condition 1> Ar 1 and Ar 2 are asymmetric to each other;
<Condition 2> L 1 represents (C6-C30)arylene unsubstituted or substituted with deuterium.
17 . The organic electroluminescent compound according to claim 15 , wherein the compound represented by Formula 1′ is selected from the following compounds: