The invention relates to oligomerization of olefins, such as ethylene, to higher olefins, such as a mixture of 1-hexene and 1-octene, using a catalyst system that comprises a) a source of chromium b) one or more activators and c) a phosphacycle-containing ligating compound. Additionally, the invention relates to a phosphacycle-containing ligating compound and a process for making said compound.

The invention relates to oligomerization of olefins, such as ethylene, to higher olefins, such as a mixture of 1-hexene and 1-octene, using a catalyst system that comprises a) a source of chromium b) one or more activators and c) a phosphacycle-containing ligating compound. Additionally, the invention relates to a phosphacycle-containing ligating compound and a process for making said compound.

Provided is a blue light-emitting material for organic light-emitting diode (OLED) comprising a phosphinine derivative and the OLED including the same. The light-emitting material for OLED of the present invention comprises the phosphinine derivative having an electron-withdrawing substituent at its C4 position of a phosphorus-containing six-membered ring. The OLED of the present invention has a pair of electrodes and organic layers including light-emitting layers between the pair of the electrodes, wherein the at least one light-emitting layer comprises an anthracene compound and the phosphinine derivative.

Provided is a blue light-emitting material for organic light-emitting diode (OLED) comprising a phosphinine derivative and the OLED including the same. The light-emitting material for OLED of the present invention comprises the phosphinine derivative having an electron-withdrawing substituent at its C4 position of a phosphorus-containing six-membered ring. The OLED of the present invention has a pair of electrodes and organic layers including light-emitting layers between the pair of the electrodes, wherein the at least one light-emitting layer comprises an anthracene compound and the phosphinine derivative.

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.

An organic compound, an electroluminescent material and its application are provided in the present disclosure. The organic compound includes a structure:

##STR00001##

X is selected from O, S, N—R.sub.N1, and CR.sub.C1R.sub.C2; Y is selected from O, S, N—R.sub.N2, CR.sub.C3R.sub.C4, O═S═O, SiR.sub.S1R.sub.S2, O═P—Ar.sub.1, and S═P—Ar.sub.2, R.sub.N1, R.sub.N2, R.sub.C1, R.sub.C2, R.sub.C3, R.sub.C4, R.sub.S1, and R.sub.S2 are each independently selected from C1˜C20 linear or branched alkyl, C6˜C40 aryl, and C3˜C40 heteroaryl; Ar.sub.1 and Ar.sub.2 are each independently selected from C6˜C40 aryl and C3˜C40 heteroaryl; L.sub.1, L.sub.2, L.sub.3, L.sub.4, and L.sub.5 are each independently selected from a single bond, C6˜C40 arylene, and C3˜C40 heteroarylene; R.sub.1, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 are each independently selected from deuterium, C1˜C20 linear or branched alkyl, C1˜C20 alkoxy, C1˜C20 alkylthio, C3˜C20 cycloalkyl, C6˜C40 aryl, C3˜C40 heteroaryl, and C6˜C40 arylamino; and n.sub.1, n.sub.2, n.sub.3, n.sub.4, n.sub.5, m.sub.1, m.sub.2, m.sub.3, m.sub.4, and m.sub.5 are integers each independently selected from 0-2.

A phosphole compound represented by the formula ##STR00001##
(wherein Ar.sup.1 and Ar.sup.2 are the same or different, and represent an optionally substituted aromatic hydrocarbon ring or an optionally substituted heteroaromatic ring; Ar.sup.3 represents a divalent π-conjugated unit; R.sup.1 represents an optionally substituted alkyl group, an optionally substituted cycloalkyl group, an optionally substituted aryl group, or an optionally substituted heteroaryl group; R.sup.2 and R.sup.3 are the same or different, and represent a hydrogen atom, an optionally substituted alkyl group, an optionally substituted cycloalkyl group, an optionally substituted aryl group, or an optionally substituted heteroaryl group; and Z represents a reactive group) can provide a fluorescent dye capable of maintaining a high fluorescence quantum yield irrespective of solvent polarity, and providing an improved fluorescence quantum yield and light resistance even in environments containing large amounts of water.

A phosphole compound represented by the formula ##STR00001##
(wherein Ar.sup.1 and Ar.sup.2 are the same or different, and represent an optionally substituted aromatic hydrocarbon ring or an optionally substituted heteroaromatic ring; Ar.sup.3 represents a divalent π-conjugated unit; R.sup.1 represents an optionally substituted alkyl group, an optionally substituted cycloalkyl group, an optionally substituted aryl group, or an optionally substituted heteroaryl group; R.sup.2 and R.sup.3 are the same or different, and represent a hydrogen atom, an optionally substituted alkyl group, an optionally substituted cycloalkyl group, an optionally substituted aryl group, or an optionally substituted heteroaryl group; and Z represents a reactive group) can provide a fluorescent dye capable of maintaining a high fluorescence quantum yield irrespective of solvent polarity, and providing an improved fluorescence quantum yield and light resistance even in environments containing large amounts of water.

A light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer including an emission layer between the first electrode and the second electrode and an electron transport region between the emission layer and the second electrode. The electron transport region includes an electron transport layer and an electron injection layer between the electron transport layer and the second electrode. The electron transport layer includes a first material and a second material, the electron injection layer includes a third material and a fourth material, and an amount of the third material is in a range of about 50 parts by weight to about 99 parts by weight, based on a total of 100 parts by weight of the electron injection layer. The first material to the fourth material are respectively the same as described in the specification.

The invention relates to oligomerization of olefins, such as ethylene, to higher olefins, such as a mixture of 1-hexene and 1-octene, using a catalyst system that comprises a) a source of chromium b) one or more activators and c) a phosphacycle-containing ligating compound. Additionally, the invention relates to a phosphacycle-containing ligating compound and a process for making said compound.