Abstract: This invention relates to a hat emitting device which comprises at least one layer that contains an organometallic dendrimer having a core comprising a metal cation. The invention also relates to organometallic dendrimers and methods for producing the same.

Abstract: This invention relates to a hat emitting device which comprises at least one layer that contains an organometallic dendrimer having a core comprising a metal cation. The invention also relates to organometallic dendrimers and methods for producing the same.

Abstract: This invention relates to a light emitting device which comprises at least one layer that contains an organometallic dendrimer having a core comprising a metal cation. The invention also relates to organometallic dendrimers and methods for producing the same.

Abstract: This invention relates to a light emitting device which comprises at least one layer that contains an organometallic dendrimer having a core comprising a metal cation. The invention also relates to organometallic dendrimers and methods for producing the same.

Abstract: Organometallic complexes comprising a trivalent lanthanide metal ion complexed with one or more polydentate ligands containing one or more pyrazolyl-derived groups, such as trispyrazolyl borate species, are useful in light emitting materials e.g., in electroluminescent flat panel displays. In the complexes, several classes of which are novel, a coordinate bond is formed between the metal and one of the nitrogen atoms of the pyrazolyl rings.

Abstract: This invention relates to a light emitting device which comprises at least one layer that contains an organometallic dendrimer having a core comprising a metal cation. The invention also relates to organometallic dendrimers and methods for producing the same.

Abstract: A monomer which luminesces in the visible region upon excitation is described of the formula: Mn+ (L)n? (CL)x in which n+ is the valency of M, (L) represents one or more anionic ligands with a total valency of n such that at least one of the ligands possesses the formula: Ch-X—Y wherein Ch represents a chelating group which is a ligand fragment comprising the chelate binding sites and the part of the rest of the ligand with which the binding sites are conjugated, Y represents an olefinic group and X represents a spacer comprising a chain of at least 4 carbon and/or hetero atoms, x is 0, 1, or 2, CL represents a neutral co-ligand and M represents a metal atom of group 2, 12, 13, d-block or f-block with the proviso that if Y is part of a styrene or substituted styrene group then M is a f-block or d-block metal.

Abstract: An organic electroluminescent device is described which comprises a compound having a skeleton of the formula: which skeleton can comprise one or more additional aromatic rings, wherein each of Z and Z?, which may be the same or different, represents a nitrogen-containing aromatic ring such that the Z and Z? rings either together form a conjugated system, optionally with one or more additional aromatic rings, or at least one of Z and Z? form a conjugated system with one or more additional aromatic rings to which Z and Z? is attached, with the proviso that, (a) when the two said rings are pyridyl rings and are connected to one another ortho to the nitrogen atoms then (i) at least one said ring is substituted by at least one electron withdrawing substituent which is a hydrocarbon aryl group or (ii) at least one said ring is fused to another aromatic ring to which the other pyridyl ring is not fused or (iii) the two said rings together form a phenanthroline ring system which is substituted by at least one el

Abstract: Organometallic complexes comprising a trivalent lanthanide metal ion complexed with one or more polydentate ligands containing one or more pyrazolyl-derived groups, such as trispyrazolyl borate species, are useful in light emitting materials e.g., in electroluminescent flat panel displays. In the complexes, several classes of which are novel, a coordinate bond is formed between the metal and one of the nitrogen atoms of the pyrazolyl rings.

Abstract: A light emitting device which comprises at least one layer that contains an organometallic dendrimer with a metal cation at its core.

Abstract: A monomer which luminesces in the visible region upon excitation is described of the formula: Mn+(L)n−(CL)x ?in which n+ is the valency of M,(L) represents one or more anionic ligands with a total valency of n− such that at least one of the ligands possesses the formula: Ch-X—Y wherein Ch represents a chelating group which is a ligand fragment comprising the chelate binding sites and the part of the rest of the ligand with which the binding sites are conjugated, Y represents an olefinic group and X represents a spacer comprising a chain of at least 4 carbon and/or hetero atoms, x is 0, 1 or 2, CL represents a neutral co-ligand and M represents a metal atom of group 2, 12, 13, d-block or f-block with the proviso that if Y is part of a styrene or substituted styrene group then M is a f-block or d-block metal.

Abstract: Photoluminescent compounds are described having no-ligand. These have formula (I) in which Ln represents a lanthanide ion, each of X, Y, and Z, which may be the same or different, represents hydrogne, an optionally substituted aromatic group or an optionally substituted aliphatic or cycloaliphatic group, such that at least one of X, Y and Z represents a said aromatic group which is conjugated with the pyrazolone ring system and such that when X or Y represents a said group, said group can optionally be attached via a hetero atom. These compounds possess useful electroluminescent properties such that they can be used in electroluminescent devices.

Abstract: Organometallic complexes comprising a divalent lanthanide metal cation complexed with from one to three polydentate ligands which preferably contain one or more pyrazolyl groups, such as trispyrazolylborate anions, are useful in light emitting devices e.g., in electroluminescent flat panel displays. In the complexes, several classes of which are novel, the lanthanide metal is preferably Eu since the Eu complexes have the ability to exhibit bright electroluminescence ranging from yellow to orange to blue.