Abstract: An organic electroluminescence element with a light emission layer containing a host compound and a phosphorescent compound. The host compound contains a boron atom in the molecule and the phosphorescent compound is a metal complex containing a Group VIII metal.

Abstract: An organic electroluminescence element is disclosed which comprises a cathode, a light emission layer containing a host compound and a dopant compound, and at least one first layer provided between the cathode and the light emission layer, wherein the dopant compound is a phosphorescent compound, and the first layer is comprised of a first material having a molecular weight of from 500 to 2000, a maximum fluorescence wavelength of not longer than 415 nm, and an F to (H+F) ratio F/(H+F) of from 0 to 0.9 in which F and H represent the fluorine atom number and the hydrogen atom number in the molecule of the material, respectively.

Abstract: An electro-luminescent element comprising an organic compound layer is disclosed. The organic compound layer contains a compound represented by Formula I or Formula V: wherein R1 and R2 are each a substituent, and Ar is an aromatic hydrocarbon ring or an aromatic heterocyclic ring each of them may have a substituent, wherein R11 through R16 and X1 through X9 are each a hydrogen atom or a substituent, they may be the same or different; and the sum of the steric parameters EsR1 through EsR16 of R11 through R16 satisfies the following expression: EsR11+EsR12+EsR13+EsR14+EsR15+EsR16≦−2.0.

Abstract: An organic electroluminescence element is disclosed which comprises a light emission layer containing a host compound and a phosphorescent compound, wherein the host compound contains a boron atom in the molecule.

Abstract: An organic electroluminescence element is disclosed which comprises a cathode, a light emission layer containing a host compound and a dopant compound, and at least one first layer provided between the cathode and the light emission layer, wherein the dopant compound is a phosphorescent compound, and the first layer is comprised of a first material having a molecular weight of from 500 to 2000, a maximum fluorescence wavelength of not longer than 415 nm, and an F to (H+F) ratio F/(H+F) of from 0 to 0.9 in which F and H represent the fluorine atom number and the hydrogen atom number in the molecule of the material, respectively.

Abstract: An electro-luminescent element comprising an organic compound layer is disclosed.

Abstract: A silver halide photographic photosensitive material is disclosed. The silver halide photographic photosensitive material comprises a hydrazine compound at least one alkyl group which has no atom other than carbon and hydrogen atoms, has three or more branches, and does not bond to aromatic ring directly.

Abstract: A photopolymerizable composition and a presensitized planographic printing plate employing the same are disclosed which comprise a compound having an ethylenically unsaturated bond and a dye represented by the following formula (1) or (2): ##STR1##