Organic light-emitting device and an apparatus including the same

An organic light-emitting device comprising:

• a first electrode;
• a second electrode;
• and
• an organic layer between the first electrode and the second electrode, wherein
• the organic layer comprises:
• an emission region;
• a hole transport region between the first electrode and the emission region;
• and an electron transport region between the emission region and the second electrode,
• the emission region comprises a first emission layer proximate to the hole transport region and a second emission layer proximate to the electron transport region,
• the first emission layer and the second emission layer are different from each other, and Equation 1 is satisfied:
• VHOD_EML1 (at 10 mA/cm2)+0.5≤VHOD_EML2 (at 10 mA/cm2) Equation 1
• wherein, in Equation 1,
• VHOD_EML1 (at 10 mA/cm2) is a driving voltage value when a current density of a first hole-only device having a structure comprising the first electrode, the hole transport region, the first emission layer, and the second electrode is 10 mA/cm2,
• VHOD_EML2 (at 10 mA/cm2) is a driving voltage value when a current density of a second hole-only device having a structure comprising the first electrode, the hole transport region, the second emission layer, and the second electrode is 10 mA/cm2, and
• the first hole-only device and the second hole-only device have substantially the same structure, except that the first emission layer and the second emission layer are respectively used in the first hole-only device and the second hole-only device,
• wherein the first emission layer and the second emission layer each, independently from one another, comprise both a first compound comprising a hole transporting host, and a second compound comprising an electron transporting host;
• or a third compound comprising a bipolar host,
• wherein the first compound is of Formula 1:
• wherein, in Formula 1,
• X11 is O, S, N(R19), or C(R19)(R20),
• R11 to R20 are each, independently from one another:
• *-(L11)a11-A11, hydrogen, deuterium, a C1-C60 alkyl group, a π electron-deficient nitrogen-free cyclic group, —C(Q1)(Q2)(Q3), —Si(Q1)(Q2)(Q3), —B(Q1)(Q2), or —N(Q1)(Q2), wherein * indicates a binding site to a neighboring atom;
• a π electron-deficient nitrogen-free cyclic group substituted with at least one of deuterium, a C1-C60 alkyl group, a π electron-deficient nitrogen-free cyclic group, —C(Q31)(Q32)(Q33), —Si(Q31)(Q32)(Q33), —B(Q31)(Q32), and —N(Q31)(Q32);
• or
• a π electron-deficient nitrogen-free cyclic group substituted with a π electron-deficient nitrogen-free cyclic group substituted with at least one of deuterium, a C1-C60 alkyl group, a π electron-deficient nitrogen-free cyclic group, —C(Q21)(Q22)(Q23), —Si(Q21)(Q22)(Q23), —B(Q21)(Q22), and —N(Q21)(Q22),
• L11 is:
• a π electron-deficient nitrogen-free cyclic group, —C(Q1)(Q2)—, —Si(Q1)(Q2)—, —B(Q1)—, or —N(Q1)—;
• or
• a π electron-deficient nitrogen-free cyclic group substituted with at least one of deuterium, a C1-C60 alkyl group, a π electron-deficient nitrogen-free cyclic group, —C(Q31)(Q32)(Q33), —Si(Q31)(Q32)(Q33), —B(Q31)(Q32), and —N(Q31)(Q32),
• a11 is 1, 2, or 3,
• A11 is
• a π electron-deficient nitrogen-free cyclic group;
• a π electron-deficient nitrogen-free cyclic group substituted with at least one of deuterium, a C1-C60 alkyl group, a π electron-deficient nitrogen-free cyclic group, —C(Q31)(Q32)(Q33), —Si(Q31)(Q32)(Q33), —B(Q31)(Q32), and —N(Q31)(Q32);
• or
• a π electron-deficient nitrogen-free cyclic group substituted with a π electron-deficient nitrogen-free cyclic group substituted with at least one deuterium, a C1-C60 alkyl group, a π electron-deficient nitrogen-free cyclic group, —C(Q21)(Q22)(Q23), —Si(Q21)(Q22)(Q23), —B(Q21)(Q22), and —N(Q21)(Q22), and
• any two or more substituents among R11 to R20 are optionally linked to each other to form one:
• a π electron-deficient nitrogen-free cyclic group;
• and a π electron-deficient nitrogen-free cyclic group substituted with at least one of deuterium, a C1-C60 alkyl group, a π electron-deficient nitrogen-free cyclic group, —C(Q31)(Q32)(Q33), —Si(Q31)(Q32)(Q33), —B(Q31)(Q32), and —N(Q31)(Q32),
• wherein Q1 to Q3, Q21 to Q23, and Q31 to Q33 are each, independently from one another:
• hydrogen;
• deuterium;
• —F;
• —Cl;
• —Br;
• —I;
• a hydroxyl group;
• a cyano group;
• a nitro group;
• a C1-C60 alkyl group;
• a C2-C60 alkenyl group;
• a C2-C60 alkynyl group;
• a C1-C60 alkoxy group;
• a C3-C60 carbocyclic group;
• or a C1-C60 heterocyclic group each, independently from one another unsubstituted or substituted with deuterium, —F, a cyano group, a C1-C60 alkyl group, a C1-C60 alkoxy group, a phenyl group, a biphenyl group, or any combination thereof,
• wherein the second compound is of Formula 2:
• wherein, in Formula 2,
• X24 is C(R24) or N, X25 is C(R25) or N, and X26 is C(R26) or N,
• at least one of X24 to X26 is N,
• R24 to R26, are independently from one another, *-(L27)a27-(Ar27)b27, hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group unsubstituted or substituted with at least one R10a, a C2-C60 alkenyl group unsubstituted or substituted with at least one R10a, a C2-C60 alkynyl group unsubstituted or substituted with at least one R10a, a C1-C60 alkoxy group unsubstituted or substituted with at least one R10a, a C6-C60 aryloxy group unsubstituted or substituted with at least one R10a, a C6-C60 arylthio group unsubstituted or substituted with at least one R10a, a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a, a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a, —Si(Q1)(Q2)(Q3), —N(Q1)(Q2), —B(Q1)(Q2), —C(═O)(Q1), —S(═O)2(Q1), or —P(═O)(Q1)(Q2),
• L24 to L27 are each, independently from one another, a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a,
• Ar24 to Ar27 are each, independently from one another, a further group represented Formula 2, a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a, or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a,
• a24 to a27 are each, independently from one another, an integer from 0 to 3,
• b24 to b27 are each, independently from one another, an integer from 1 to 8,
• two or more neighboring groups of Ar24 to Ar27 and R24 to R26 are, independently from one another, optionally linked to each other to form a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a,
• * indicates a binding site to a neighboring atom, and
• R10a is:
• deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, or a nitro group;
• a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, or a C1-C60 alkoxy group each, independently from one another, unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group, —Si(Q11)(Q12)(Q13), —N(Q11)(Q12), —B(Q11)(Q12), —C(═O)(Q11), —S(═O)2(Q11), —P(═O)(Q11)(Q12), or any combination thereof,
• a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, or a C6-C60 arylthio group each, independently from one another, unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group,
• —Si(Q21)(Q22)(Q23), —N(Q21)(Q22), —B(Q21)(Q22), —C(═O)(Q21), —S(═O)2(Q21), —P(═O)(Q21)(Q22), or any combination thereof, or
• —Si(Q31)(Q32)(Q33), —N(Q31)(Q32), —B(Q31)(Q32), —C(═O)(Q31), —S(═O)2(Q31), or —P(═O)(Q31)(Q32),
• Q1 to Q3, Q11 to Q13, Q21 to Q23 and Q31 to Q33 are, independently from one another:
• hydrogen;
• deuterium;
• —F;
• —Cl;
• —Br;
• —I;
• a hydroxyl group;
• a cyano group;
• a nitro group;
• C1-C60 alkyl group;
• C2-C60 alkenyl group;
• C2-C60 alkynyl group;
• C1-C60 alkoxy group;
• or a C3-C60 carbocyclic group or a C1-C60 heterocyclic group each, independently from one another, unsubstituted or substituted with deuterium, —F, a cyano group, a C1-C60 alkyl group, a C1-C60 alkoxy group, a phenyl group, a biphenyl group, or any combination thereof, and
• wherein the third compound is of Formula 3:
• wherein, in Formula 3,
• Y1 is a single bond, —O—, —S—, —C(R27)(R28)—, —N(R27)—, Si(R27)(R28)—, —C(═O)—, —S(═O)2—, —B(R27)—, —P(R27)—, or —P(═O)(R27)(R28)—,
• k1 is 0 or 1,
• CY21 and CY22 are each, independently from one another, a C3-C60 carbocyclic group or a C1-C60 heterocyclic group,
• L21 to L23 and L28 are each, independently from one another, a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a,
• Ar21 to Ar23 and Ar28 are each, independently from one another, a group represented by Formula 3A, a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a, or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a,
• at least one of Ar21 to Ar23 is a group represented by Formula 3A,
• a21 to a23 and a28 are each, independently from one another, an integer from 0 to 3,
• b21 to b23 and b28 are each, independently from one another, an integer from 1 to 8,
• c21 to c22 are each, independently from one another, an integer from 1 to 20,
• c23 is an integer from 0 to 5,
• n21 and n22 are each, independently from one another, an integer from 1 to 8,
• X21 to X23 are each, independently from one another, C or N,
• when each of X21 to X23 is C, at least one of R21 to R23 is, independently from one another, —F;
• a cyano group;
• or a C1-C60 alkyl group substituted with at least one of —F and a cyano group,
• R21 to R23, R27 and R28 are each, independently from one another, *-(L28)a28-(Ar28)b28, hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group unsubstituted or substituted with at least one R10a, a C2-C60 alkenyl group unsubstituted or substituted with at least one R10a, a C2-C60 alkynyl group unsubstituted or substituted with at least one R10a, a C1-C60 alkoxy group unsubstituted or substituted with at least one R10a, a C6-C60 aryloxy group unsubstituted or substituted with at least one R10a, a C6-C60 arylthio group unsubstituted or substituted with at least one R10a, a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a, a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a, —Si(Q1)(Q2)(Q3), —N(Q1)(Q2), —B(Q1)(Q2), —C(═O)(Q1), —S(═O)2(Q1), or —P(═O)(Q1)(Q2),
• two or more neighboring groups of Ar21 to Ar23, Ar28, R21 to R23, and R28 are, independently from one another, optionally linked to each other to form a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a,
• * indicates a binding site to a neighboring atom, and
• R10a is:
• deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, or a nitro group;
• a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, or a C1-C60 alkoxy group each, independently from one another, unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group, —Si(Q11)(Q12)(Q13),
• —N(Q11)(Q12), —B(Q11)(Q12), —C(═O)(Q11), —S(═O)2(Q11), —P(═O)(Q11)(Q12), or any combination thereof,
• a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, or a C6-C60 arylthio group each, independently from one another, unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C60 carbocyclic group, a C1-C60 heterocyclic group, a C6-C60 aryloxy group, a C6-C60 arylthio group, —Si(Q21)(Q22)(Q23), —N(Q21)(Q22), —B(Q21)(Q22), —C(═O)(Q21),
• —S(═O)2(Q21), —P(═O)(Q21)(Q22), or any combination thereof, or
• —Si(Q31)(Q32)(Q33), —N(Q31)(Q32), —B(Q31)(Q32), —C(═O)(Q31), —S(═O)2(Q31), or
• —P(═O)(Q31)(Q32),
• Q1 to Q3, Q11 to Q13, Q21 to Q23 and Q31 to Q33 are, independently from one another:
• hydrogen;
• deuterium;
• —F;
• —Cl;
• —Br;
• —I;
• a hydroxyl group;
• a cyano group;
• a nitro group;
• C1-C60 alkyl group;
• C2-C60 alkenyl group;
• C2-C60 alkynyl group;
• C1-C60 alkoxy group;
• or a C3-C60 carbocyclic group or a C1-C60 heterocyclic group each, independently from one another, unsubstituted or substituted with deuterium, —F, a cyano group, a C1-C60 alkyl group, a C1-C60 alkoxy group, a phenyl group, a biphenyl group, or any combination thereof.