The present invention relates to the use of efficient phosphorous substances, in particular based on diphenylamine and heterocyclic diphenylamine derivatives as stabilizers for organic materials, in particular for plastic materials, against oxidative, thermal and/or actinic degradation. Te present invention additionally relates to an organic material that has been correspondingly stabilized as described above. The invention further relates to a method of stabilizing organic materials and to specific stabilizers.

An object of the present invention is to provide crystal of a cyclic phosphonic acid sodium salt (2ccPA) with high purity and excellent storage stability and a method for producing the crystal. The present invention provides a crystal of a cyclic phosphonic acid sodium salt (2ccPA) represented by formula (1): ##STR00001##

The present disclosure relates to the field of organic electroluminescence materials and particularly relates to a compound and an organic light emitting display device. The compound has a structure represented by Formula (I):

##STR00001##

and, m, n, p, q, r, s, u, and v are each independently selected from 0 or 1, at least one of r and s is 1, at least one of u and v is 1, L.sub.1, L.sub.2, L.sub.3, and L.sub.4 are each independently selected from substituted or unsubstituted C6-C40 aryl, or substituted or unsubstituted C3-C40 heterocyclyl, and A.sub.1, A.sub.2, A.sub.3, and A.sub.4 each are independently selected from an electron acceptor unit.

A phosphorus-containing flame retardant, a preparation method thereof, a resin composition comprising the phosphorus-containing flame retardant and an article made therefrom are disclosed. The phosphorus-containing flame retardant is characterized by having the advantages of high phosphorus content, high resin compatibility, not increasing gel time of varnish and low water absorption rate, and is therefore suitable for use as a flame retardant of various resin materials.

An object t of the present invention is to proroaide crystal of a cyclic phosphonic acid sodium salt (2ccPA) with high purity and excellent storage stability and a method for producing the crystal. The present invention provides a crystal of a cyclic phosphonic acid sodium salt (2ccPA) represented by formula (1): ##STR00001##

An object t of the present invention is to provide crystal of a cyclic phosphonic acid sodium salt (2ccPA) with high purity and excellent storage stability and a method for producing the crystal. The present invention provides a crystal of a cyclic phosphonic acid sodium salt (2ccPA) represented by formula (1):

##STR00001##

An object of the present invention is to provide crystal of a cyclic phosphonic acid sodium salt (2ccPA) with high purity and excellent storage stability and a method for producing the crystal. The present invention provides a crystal of a cyclic phosphonic acid sodium salt (2ccPA) represented by formula (1):

##STR00001##

The present disclosure provides a compound for a display panel. The compound includes elements selected from O, S or N, electron-donor groups and electron-accepting groups. The OLED device in the display panel includes an anode, a cathode, and at least one organic thin film layer between the anode and the cathode. The organic thin film layer includes a light emitting layer, the light emitting layer includes the compound of the present disclosure, and the compound is used to be any one of a host material, a doping material, and a co-doping material. The compound reduces energy level difference between singlet and triplet states E.sub.ST through design of the compound molecular structure. The compound realizes an efficient reverse intersystem crossing process, has typical TADF characteristics, and can be used as a light-emitting layer material of an OLED device to improve luminous efficiency and working life.

Provided is an electrolyte solution for a lithium secondary battery and a lithium secondary battery including the electrolyte solution. The electrolyte solution includes an additive represented by a specific chemical formula, an organic solvent and a lithium salt. The lithium secondary battery including the electrolyte solution provide enhanced high-temperature properties.

A novel polycyclic aromatic compound in which plural aromatic rings are linked via boron atoms, oxygen atoms and the like is provided, and therefore, the range of selection of the material for organic electroluminescent elements can be widened. Also, an excellent organic electroluminescent element is provided by using the novel polycyclic aromatic compound as a material for an organic electroluminescent element.