Organic light-emitting device
Provided is an organic light emitting device including a cathode; an anode provided opposite to the cathode; a light emitting layer provided between the cathode and the anode; and an organic material layer provided between the cathode and the light emitting layer, and including Compound (A) including a heteroatom and a cyano group, wherein Compound (A) satisfies Equation 1 and Equation 2: | P El CN |≥3debye Equation 1 wherein: |P El CN | means an absolute value of a dipole moment of Compound (A); P EI C N P EI > Ea EI CN Ea EI Equation 2 wherein: |P El CN | means an absolute value of a dipole moment of Compound (A); |P El | means an absolute value of a dipole moment of a compound having the same core as the compound of |P El CN | without including a cyano group; |Ea El CN | means an absolute value of electron affinity of Compound (A); and |Ea El | means an absolute value of electron affinity of a compound having the same core as the compound of |Ea El CN | without including a cyano group.
1. An organic light emitting device comprising:
a cathode;
an anode provided opposite to the cathode;
one or more of a light emitting layer provided between the cathode and the anode; and
an organic material layer provided between the cathode and the light emitting layer, and including Compound (A) including a heteroatom and a cyano group,
wherein Compound (A) satisfies the following Equation 1 and the following Equation 2:
| P El CN |≥3debye Equation 1
wherein in Equation 1:
|P El CN | means an absolute value of a dipole moment of Compound (A);
P
EI
C
N
P
EI
>
Ea
EI
CN
Ea
EI
Equation
2
wherein in Equation 2:
|P El CN | means an absolute value of a dipole moment of Compound (A);
|P El | means an absolute value of a dipole moment of a compound having the same core as the compound of |P El CN | without including a cyano group;
|Ea El CN | means an absolute value of electron affinity of Compound (A); and
|Ea El | means an absolute value of electron affinity of a compound having the same core as the compound of |Ea El CN | without including a cyano group.
2. The organic light emitting device of claim 1 , wherein the organic material layer is a hole blocking layer, an electron transfer layer, an electron injection layer, or an electron injection and transfer layer.
3. The organic light emitting device of claim 1 , further comprising a hole blocking layer provided between the light emitting layer and the organic material layer,
wherein the hole blocking layer is provided adjoining the light emitting layer; and the organic material layer is an electron injection and transfer layer.
4. The organic light emitting device of claim 1 , wherein Compound (A) has electron mobility of greater than or equal to 10 −12 cm 2 /Vs and less than or equal to 10 2 cm 2 /Vs under an electric field condition of 0.1 MV/cm.
5. The organic light emitting device of claim 1 , wherein the organic material layer has a glass transition temperature (Tg) of higher than 100° C. and lower than or equal to 200° C.
6. The organic light emitting device of claim 1 , wherein the light emitting layer includes a host and a dopant, and the dopant has a maximum light emission wavelength in a range of 420 nm to 520 nm.
7. The organic light emitting device of claim 6 , wherein the dopant is a blue fluorescent dopant.
8. The organic light emitting device of claim 1 , wherein the organic material layer further includes a metal complex, and includes Compound (A):the metal complex in a weight ratio of 1:9 to 9:1.
9. The organic light emitting device of claim 1 , wherein Compound (A) is a compound including a heteroring including at least one N.
10. The organic light emitting device of claim 1 , comprising two or more light emitting layers.
11. The organic light emitting device of claim 10 , wherein at least two of the two or more light emitting layers have a different maximum light emission wavelength.
12. The organic light emitting device of claim 10 , wherein at least one of the two or more light emitting layers includes a phosphorescent dopant, and at least one of the light emitting layers includes a fluorescent dopant.
13. The organic light emitting device of claim 1 , comprising:
a first light emitting layer provided between the anode and the organic material layer including Compound (A); and
a second light emitting layer provided on the first light emitting layer.
14. The organic light emitting device of claim 1 , comprising:
a first light emitting layer provided on a part of between the anode and the organic material layer including Compound (A); and
a second light emitting layer provided on the remaining part of between the anode and the organic material layer including Compound (A).
15. The organic light emitting device of claim 1 , comprising:
a first light emitting layer provided between the anode and the organic material layer including Compound (A);
a second light emitting layer provided on the first light emitting layer; and
a third light emitting layer provided on the second light emitting layer.