The present disclosure provides a technique capable of improving durability (particularly luminescence life-span) of an electroluminescence. In order to solve the above problems, the present disclosure provides an arylamine-fluorene alternating copolymer having a structural unit (A) represented by Chemical Formula (1).

##STR00001##

A high purity raw material is provided with which an organic EL material exhibiting high luminance, high efficiency, low voltage driving, and long lifetime can be synthesized. A method for purifying the raw material and a method for producing a light-emitting material synthesized using the high purity raw material are also provided. A means for solving the problem is a compound which is a raw material for synthesizing an organic EL material. In the compound, the content of an impurity having a molecular weight larger than the molecular weight of the compound is 0.15% or less, and the content of the impurity is a percentage of the sum of peak areas having a retention time shorter than the retention of a peak identified as the compound in a chromatogram of organic solvent-based size-exclusion chromatography relative to the sum of all peak areas.

Provided are an organometallic compound represented by Formula 1, an organic light-emitting device including the organometallic compound, and a diagnostic composition including the organometallic compound:

M(L.sub.1).sub.n1(L.sub.2).sub.n2  Formula 1 wherein, in Formula 1, M, L.sub.1, L.sub.2, n1 and n2 may each be understood by referring to the descriptions thereof provided herein.

The present invention relates to compounds of the formula (1) and (2) which are suitable for use in electro¬nic devices, in particular organic electroluminescent devices.

The present invention generally relates to fluorescent marking compositions and their use to determine whether a surface has been cleaned. More particularly, the marking compositions comprise fluorescent polymers.

Nanoparticle compositions comprising nanoparticles formed from -conjugated cross-linked polymers are disclosed, together with their methods of manufacture and their applications. Owing to the nature of the cross-links formed therein, the nanoparticle compositions afford a high degree of manufacturing flexibility and control, as well as being amenable to facile purification for the purpose of imaging and electronics applications.

A light-emitting element containing a light-emitting material with high light emission efficiency is provided. The light-emitting element includes a high molecular material and a guest material. The high molecular material includes at least a first high molecular chain and a second high molecular chain. The guest material has a function of exhibiting fluorescence or converting triplet excitation energy into light emission. The first high molecular chain and the second high molecular chain each include a first skeleton, a second skeleton, and a third skeleton, and the first skeleton and the second skeleton are bonded to each other through the third skeleton. The first high molecular chain and the second high molecular chain have a function of forming an excited complex.

The invention is directed to a method for the preparation of a liquid crystal block copolymer, comprising melt polycondensation of a melt comprising at least two non-latent aromatic monomers and a latent aromatic monomer.

A method is directed to synthesis of poly(triphenylacrylonitrite)s (PTPANs) comprising polycoupling dibromoarenes, internal diynes, and potassium ferrocyanide, resulting in polycoupled dibromoarenes, internal diynes, and potassium ferrocyanide; and producing poly(triphenylacrylonitrite)s (PTPANs) by catalysis of the polycoupled dibromoarenes, internal diynes, and potassium ferrocyanide with palladium acetate and sodium bicarbonate, wherein the catalysis is allowed to proceed in dimethylacetamide under nitrogen at a prescribed temperature for a prescribed time. Further, poly(triphenylacrylonitrite)s (PTPANs) is a polymer and comprises a backbone structure of ##STR00001##
wherein x and y are integers;
wherein each R is independently selected from the group consisting of ##STR00002##
and
wherein each R is independently selected from the group consisting of ##STR00003##

Polymeric layers suitable for organic layers of electronic devices that show reduced driving voltage and/or increased luminous efficiency.