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1. A blue phosphorescence compound represented by Chemical Formula 1 below:wherein, in Chemical Formula 1, X1, X2, and X3 each are a nitrogen atom or a carbon atom; A is a 5- to 6-membered nitrogen-containing heteroaromatic group consisting of X1—X2—N; B is a 5- to 6-membered aromatic or heteroaromatic group consisting of X3—C; X4-L1-X5 is a bidentate ligand; X4 and X5 each are independently a carbon atom, a nitrogen atom, or an oxygen atom; L1 is an atom group forming the bidentate ligand; n is an integer of 1 to 3; a is an integer of 0 to 3; b is an integer of 0 to 3; Ra and Rb each are independently one selected from hydrogen, D, halogens of F, Cl, and Br, CF3, cyano groups, C1˜C18 alkyl groups, C1˜C18 alkoxy groups, C6 or more substituted or unsubstituted aromatic groups, C5 or more substituted or unsubstituted heteroaromatic groups, C1˜C18 amine groups, amine groups substituted with C6 or more aromatic groups, amine groups substituted with C5 or more heteroaromatic groups, silyl groups substituted with C1˜C18 alkyl groups or C6 or more aromatic groups, and silyl groups substituted with C5 or more heteroaromatic groups; and Rc is one selected from C3˜C18 alkyl groups, C3˜C18 alkoxy groups, C6 or more substituted or unsubstituted aromatic groups, C5 or more substituted or unsubstituted heteroaromatic groups, C3˜C18 amine groups, amine groups substituted with C6 or more aromatic groups, amine groups substituted with C5 or more heteroaromatic groups, silyl groups substituted with C3˜C18 alkyl or C6 or more aromatic groups, and silyl groups substituted with C5 or more heteroaromatic groups.
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