Compound for organic light-emitting device and organic light-emitting device including the same

1. A compound for an organic light-emitting device, the compound satisfying Mathematical Formula 1 and being represented by one selected from the group consisting of Chemical Formulae 1A-1 to 1A-6:

wherein, in Chemical Formulae 1A-1 and 1A-2,

R 12 , R 13 , R 15 , R 17 , R 18 and R 20 are each independently selected from the group consisting of —F, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, —Si(CH 3 ) 3 , and compounds represented by Chemical Formulae 3-1 and 3-2, and

in Chemical Formulae 1A-3 to 1A-6,

R 12 , R 13 , R 15 , R 17 , R 18 and R 20 are each independently selected from the group consisting of a hydrogen atom, —F, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, —Si(CH 3 ) 3 , and compounds represented by Chemical Formulae 3-1 and 3-2:

wherein, in Chemical Formulae 3-1 and 3-2,

* is a binding site to an adjacent atom;

E S1 <2E T1 <E T2 ,  Mathematical Formula 1

wherein, in Mathematical Formula 1,

E S1 is a first singlet energy of the compound, E S1 being in a range of about 3.1 eV to about 3.3 eV;

E T1 is a first triplet energy of the compound; and

E T2 is a second triplet energy of the compound.

2. The compound of claim 1 , wherein Chemical Formulae 1A-1 to 1A-6 satisfy Chemical Formula 1, wherein a first triplet energy (E AT1 ) of A and a first triplet energy (E BT1 ) of B satisfy Mathematical Formula 2:

E AT1 <E BT1 .  Mathematical Formula 2

3. The compound of claim 2 , wherein a second triplet energy (E AT2 ) of A and a first triplet energy (E BT1 ) of B satisfy Mathematical Formula 3:

E AT2 <E BT1 .  Mathematical Formula 3

4. The compound of claim 1 , wherein the compound is selected from Compounds 1 to 10:

5. An organic light-emitting device comprising:

a first electrode;

a second electrode; and

an organic layer between the first electrode and the second electrode, the organic layer comprising an emission layer,

wherein the emission layer comprises the compound of claim 1 .

6. The organic light-emitting device of claim 5 , wherein the emission layer comprises a dopant and the compound as a host.

7. The organic light-emitting device of claim 5 , wherein the emission layer comprises a host and the compound as a dopant.

8. The compound of claim 1 , wherein

E T1 is in a range of about 1.3 eV to about 1.7 eV, and

E T2 is in a range of about 2.8 eV to about 3.5 eV.