NOVELTY - An electroluminescent bivalent metal complex is new.    USE - In an electroluminescent device i.e. organic display; and in an organic solar cell (all claimed).    ADVANTAGE - The compound exhibits excellent electric conductivity and electroluminescent property of high efficiency and provides lowered operation voltage and improved power efficiency.    DETAILED DESCRIPTION - An electroluminescent bivalent metal complex of formula L1L1M1 is new.    L1=group of formula (T1);    M1=bivalent metal;    X=O, S or Se;    A1=5- or 6-membered heteroaromatic ring or 5- or 6-heteroaromatic ring fused with 6-20C aromatic ring (where the heteroaromatic ring or the heteroaromatic ring fused with an aromatic ring form a chemical bond with R1 to create a fused ring, and ring A1 is optionally further substituted by 1-10C alkyl, halogen, 1-10C alkyl with halogen substituent(s), phenyl, naphthyl, biphenyl, fluorenyl, thiophenyl, furanyl, tri-1-10C alkylsilyl, tri-6-20C arylsilyl, di-1-10C alkyl-6-20C arylsilyl, di-1-10C alkylamino or di-6-20C arylamino));    B1=group of formulae (i)-(v);    R1-R4=1-10C alkyl, 1-10C alkyl with halogen substituent(s), tri-1-10C alkylsilyl, tri-6-20C arylsilyl, di-1-10C alkyl-6-20C arylsilyl, 6-20C aryl, 4-20C heteroaryl, di-1-10C alkylamino or di-6-20C arylamino (all optionally further substituted by 1-10C alkyl, halogen, 1-10C alkyl with halogen substituent(s), phenyl, naphthyl, biphenyl, fluorenyl, thiophenyl, furanyl, tri-1-10C alkylsilyl, tri-6-20C arylsilyl, di-1-10C alkyl-6-20C arylsilyl, di-1-10C alkylamino or di-6-20C arylamino), H or halogen;    R11-R22=H, 1-10C alkyl, halogen, 1-10C alkyl with halogen substituent(s), 1-10C alkoxy, phenyl, cyano or 3-7C cycloalkyl;    R11-R12, R13-R14, R15-R16, R17-R18, R19-R20 or R21-R22=double bond or carbonyl;    R31 and R32=1-10C alkyl or 6-20C aryl.    Each R1-R4 is linked to an adjacent substituent via alkylene or alkenylene to form a fused ring. Each R11-R22 is linked to an adjacent substituent via alkylene or alkenylene to form 5-7C spiro ring or 5-9C fused ring. An INDEPENDENT CLAIM is included for an electroluminescent device (D1) comprising the complex (I) as host material of an electroluminescent layer.