Metallic compound and organic electroluminescence device comprising the same

1. A metallic compound represented by the following Chemical Formula 1:

Wherein, M is a transition metal selected from Ir, Pt, Rh, Re, and Os, m is 2 or 3, n is 0 or 1, the sum of m and n is 3, provided that the sum of m and n is 2 when M is Pt,

X is N or P,

Y is S, O, or Se,

of the Chemical Formula 1 is represented by the following Chemical Formula 2:

wherein, in the above Chemical Formulae 2, * denotes a portion that is covalently bound with adjacent aromatic portion,

the transition metal M forms a complex while bound with a portion denoted as “a” in the above Chemical Formulae 2 by a covalent bond and bound with X of the Chemical Formula 1 by a coordination bond,

R 1 -R 3 , and R 5 -R 14 are hydrogen, a C1 to C20 alkyl, an aryl, a cycloalkyl, a halogen, a linear or branched substituent including at least one halogen, a linear or branched substituent including at least one heteroatom, carbonyl, vinyl, or acetylenyl, or form a cycle, and are the same or different,

R 4 is hydrogen, a C1 to C20 alkyl excluding an aromatic cyclic substituent, a cycloalkyl, a halogen, a linear or branched substituent including at least one halogen, or a linear or branched substituent including at least one heteroatom, and

L 2 of the Chemical Formula 1 is represented by the following Chemical Formula 4:

wherein

Z and W in the above Chemical Formula 4 are the same or different and a heteroatom of O, N, S, or P, and

R 21 -R 25 in the Chemical Formula 4 are the same or different, and are selected from hydrogen, a C1 to C20 alkyl, an aryl, a cycloalkyl, a halogen, a linear or branched substituent including at least one halogen, a linear or branched substituent including at least one heteroatom, carbonyl, vinyl, or acetylenyl, or form a cycle.