Light emitting polymer comprising phosphorescence unit and fluorescence unit and organic light emitting device comprising the light emitting polymer

An organic light emitting device, comprising:

• a pair of electrodes;
• and
• an organic layer comprising a light emitting polymer between the pair of electrodes, the light emitting polymer comprising a phosphorescence unit and a fluorescence unit, the light emitting polymer represented by Formula 1:
• wherein X1 and X2 are each independently N or C, and at least one of X1 and X2 is N;
• M is a bivalent to tetravalent metal atom;
• a and b are each a real number of 0.01 to 0.99, c is a real number of 0 to 0.99, and a+b+c=1;
• t is 1 or 2;
• and
• L has at least one structure selected from the group consisting of structures represented by Formulae 3A through 3X:
• wherein Z is S, O or NT8;
• T1, T2, T3, T4, T5, T6, T7 and T8 are each independently a hydrogen atom, a halogen atom, —CF3, —CN, —Si(A1)(A2)(A3), a substituted or unsubstituted C1-C12 alkyl group, a substituted or unsubstituted C2-C12 alkenyl group, a substituted or unsubstituted C6-C20 aryl group, a substituted or unsubstituted C1-C12 alkoxy group, a substituted or unsubstituted C6-C20 aryloxy group or an amino group, and alternatively, at least two of T1, T2, T3, T4, T5, T6, T7 and T8 can be fused to form a 5 to 7 membered aliphatic or aromatic ring;
• A1, A2 and A3 are each independently a hydrogen atom, a substituted or unsubstituted C1-C12alkyl group, a substituted or unsubstituted C2-C12 alkenyl group or a substituted or unsubstituted C1-C12 alkoxy group;
• and
• * is a site at which M is bonded;
• and
• Ar1 in Formula 1 is a fluorescence unit and has independently at least one structure selected from the group consisting of structures represented by Formulae 5C through 5M, Formulae 5O and 5P, Formula 5S, and Ar2 is a fluorescence unit and is represented by Formula 6:
• wherein R1, R2, R3 and R4 are each independently a hydrogen atom, a substituted or unsubstituted C1-C12 alkyl group, a substituted or unsubstituted C1-C12 alkoxy group, or a substituted or unsubstituted C6-C20 aryl group;
• X5 is O, S,
• wherein Q1, Q2, Q3, Q4, Q5 and Q6 are each independently a hydrogen atom, a substituted or unsubstituted C1-C20 alkyl group or a C1-C20 alkoxy group;
• Y is a substituted or unsubstituted C6-C20 arylene group;
• and
• R is a hydrogen atom, a substituted or unsubstituted C1-C20 alkyl group, a substituted or unsubstituted C1-C20 alkoxy group, a substituted or unsubstituted C3-C30 cycloalkyl group, a substituted or unsubstituted C6-C30 aryl group, or a substituted or unsubstituted C6-C30 heteroaryl group.