An organic electron transport material, which includes a phosphine oxide derivative represented by the following Formula (1): ##STR00001## R.sup.1 represents an atomic group which has either or both of one or more aryl groups and one or more heteroaryl groups and which may have one or more phosphine oxide group, and R.sup.2 to R.sup.9 each independently represent an atom or an atomic group selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, a C.sub.1-C.sub.12 linear or branched alkyl group, a linear or branched fluoroalkyl group, an aryl group, a substituted aryl group, a heteroaryl group, and a substituted heteroaryl group.

The present disclosure relates to a compound, an organic electroluminescent device, and a display device. The compound has a structure of formula (I)

##STR00001## X is selected from a C atom, a Si atom, a B atom, or a P atom; Y.sub.1 to Y.sub.4 are each independently selected from a C atom or an N atom; A and B are each independently selected from any one or more of a substituted or unsubstituted C6-C40 aryl group and a substituted or unsubstituted C4-C40 heteroaryl group; R.sub.1 is selected from carbonyl, C1-C9 alkyl, a substituted or unsubstituted C6-C18 aryl group, and a substituted or unsubstituted C4-C30 heteroaryl group; and R.sub.2 and R.sub.3 are each independently selected from any one of a C1-C9 alkyl group, a substituted or unsubstituted C6-C18 aryl group, and a substituted or unsubstituted C4-C30 heteroaryl group, and n is selected from 0 or 1.

The invention provides compounds of Formula (I), or pharmaceutically acceptable salts thereof:

##STR00001##

The compounds, compositions, methods and kits of the invention are useful for the treatment of pain, itch, and neurogenic inflammation.

The invention provides compounds of Formula (I), or pharmaceutically acceptable salts thereof:

##STR00001##

The compounds, compositions, methods and kits of the invention are useful for the treatment of pain, itch, and neurogenic inflammation.

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.

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.

An organic electron transport material, which includes a phosphine oxide derivative represented by the following Formula (1):

##STR00001## R.sup.1 represents an atomic group which has either or both of one or more aryl groups and one or more heteroaryl groups and which may have one or more phosphine oxide group, and R.sup.2 to R.sup.9 each independently represent an atom or an atomic group selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, a C.sub.1-C.sub.12 linear or branched alkyl group, a linear or branched fluoroalkyl group, an aryl group, a substituted aryl group, a heteroaryl group, and a substituted heteroaryl group.

Provided herein are N-heterocyclic phosphines (NHPs) useful in metal-free phosphorus-carbon bond forming reactions. Methods for preparing vinylphosphonates using NHPs also are provided. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

Provided herein are N-heterocyclic phosphines (NHPs) useful in metal-free phosphorus-carbon bond forming reactions. Methods for preparing vinylphosphonates using NHPs also are provided. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

A polycyclic compound according to an embodiment of the inventive concept is represented by the following Formula 1: ##STR00001##
In Formula 1, Ar.sub.1 and Ar.sub.2 are each independently substituted or unsubstituted aryl group having 6 to 30 carbon atoms for forming a ring, or substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms for forming a ring, where Ar.sub.1 and Ar.sub.2 may combine with each other to form a ring, and A is represented by the following Formula 2-1 or 2-2: ##STR00002##