ORGANOMETALIC COMPOUNDS FOR ELECTROLUMINESCENCE AND ORGANIC ELECTROLUMINESCENT DEVICE USING THE SAME

摘要

An electroluminescent compound is provided to improve a power efficiency considerably by lowering a driving voltage markedly and enhancing a current efficiency, and to reduce a consumption power of an organic electroluminescent device largely. An electroluminescent compound has a composition represented by the following formula 1 of L^1L^2L^3M_2Q, wherein ligands L^1, L^2, and L^3 are independently selected from the structures represented by the following formula 1-1, M is a divalent metal, and Q is a monovalent anion derived from inorganic or organic acids. In the formula 1-1, X is O, S, or Se, the ring A is oxazole, thiazole, imidazole, oxadiazole, thiadiazole, benzooxazole, benzothiazole, benzoimidazole, pyridine, or quinoline, R1-R4 are independently hydrogen, C1-5 alkyl, halogen, silyl group, or C6-20 aryl group, or are bound to a neighboring substituent through alkylene or alkenylene to form a fused ring, wherein the pyridine and quinoline are chemically bound to R1 to form a fused ring, and the ring A and the aryl group of the R1-R4 are further substitutable with a C1-5 alkyl, halogen, halogen-substituted C1-5 alkyl, phenyl, naphthyl, silyl, or amino group.