Light emitting device

A light emitting device, comprising:

• a first electrode;
• a second electrode opposite to the first electrode;
• and
• an emission layer between the first electrode and the second electrode,
• wherein the emission layer comprises:
• a first compound represented by Formula 1;
• and
• at least one of a second compound represented by Formula H-1, a third compound represented by Formula H-2, or a fourth compound represented by Formula D-2:
• in Formula 1,
• X1 and X2 are each independently NR6, O, or S, where at least one of X1 or X2 is NR6,
• Y is NR7, O, or S,
• Z is a substituted or unsubstituted t-butyl group, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms,
• R1 to R7 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, and/or combined with an adjacent group to form a ring,
• n1 is an integer of 0 to 2,
• n2 and n5 are each independently an integer of 0 to 4, and
• n3 and n4 are each independently an integer of 0 to 3,
• in Formula H-1,
• L1 is a direct linkage, a substituted or unsubstituted arylene group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroarylene group of 2 to 30 ring-forming carbon atoms,
• Ar1 is a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms,
• R8 and R9 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, and
• n6 and n7 are each independently an integer of 0 to 4,
• in Formula H-2,
• at least one of Z1 to Z3 is N, and the Z1, Z2 and Z3 that are not N are CR13, and
• R10 to R13 are each independently a hydrogen atom, a deuterium atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms,
• in Formula D-2,
• Q1 to Q4 are each independently C or N,
• C1 to C4 are each independently a substituted or unsubstituted hydrocarbon ring of 5 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocycle of 2 to 30 ring-forming carbon atoms,
• L21 to L23 are each independently a direct linkage, *—O—*, *—S—*,
• a substituted or unsubstituted divalent alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted arylene group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroarylene group of 2 to 30 ring-forming carbon atoms,
• b1 to b3 are each independently 0 or 1,
• R21 to R26 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 1 to 30 ring-forming carbon atoms, and/or combined with an adjacent group to form a ring, and
• d1 to d4 are each independently an integer of 0 to 4.