A light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an interlayer between the first electrode and the second electrode and comprising an emission layer, wherein the interlayer further includes an electron transport region between the emission layer and the second electrode, the electron transport region includes a first compound of Formula 1 and a second compound of Formula 2, the first compound and the second compound are different from each other, and the second compound includes at least one π electron-deficient nitrogen-containing C.sub.1-C.sub.60 cyclic group, where Formulae 1 and 2 are described herein.

The present invention relates to a compound of formula 1 and an organic electronic device comprising an organic semiconductor layer, wherein at least one organic semiconductor layer comprises a compound of formula (1), wherein L.sup.1 has the formula (2) and L.sup.2 has the formula (3), wherein L.sup.1 and L.sup.2 are bonded at “*” via a single bond independently to the same or different arylene groups or heteroarylenes group of Ar.sup.1; and wherein X.sup.1, X.sup.2 are independently selected from O, S and Se; Ar.sup.1 is selected from substituted or unsubstituted C.sub.20 to C.sub.52 arylene or C.sub.14 to C.sub.64 heteroarylene, wherein the substituent of the substituted C.sub.20 to C.sub.52 arylene or C.sub.14 to C.sub.64 heteroarylene are independently selected from C.sub.1 to C.sub.12 alkyl, C.sub.1 to C.sub.12 alkoxy, CN, halogen, OH, C.sub.6 to C.sub.25 aryl and C.sub.2 to C.sub.21 heteroaryl; R.sup.1, R.sup.2 are independently selected from substituted or unsubstituted C.sub.1 to C.sub.16 alkyl, wherein the substituent of substituted C.sub.1 to C.sub.16 alkyl is selected from C.sub.6 to C.sub.18 arylene or C.sub.2 to C.sub.12 heteroarylene; R.sup.3, R.sup.4 are independently selected from substituted or unsubstituted C.sub.1 to C.sub.16 alkyl, substituted or unsubstituted C.sub.6 to C.sub.18 arylene, C.sub.2 to C.sub.20 heteroarylene, wherein the substituent of substituted C.sub.1 to C.sub.16 alkyl, the substituent of the substituted C.sub.6 to C.sub.18 arylene, C.sub.2 to C.sub.20 heteroarylene are independently selected from C.sub.6 to C.sub.18 arylene or C.sub.2 to C.sub.12 heteroarylene; n is selected from 1 to 5, wherein n is an integer number.

The present application provides a light-emitting device and an electronic apparatus including the light-emitting device. The light-emitting device includes: a first electrode; a second electrode facing the first electrode; an interlayer between the first electrode and the second electrode and including an emission layer; and an electron transport layer and an electron injection layer between the emission layer and the second electrode, wherein the electron transport layer includes a mixed layer including a first compound and a second compound, the first compound includes a C.sub.14-C.sub.60 carbocyclic group, and a triplet energy of the first compound is about 2.0 electron volts or lower, the second compound includes a π electron-depleted nitrogen-containing C.sub.1-C.sub.60 cyclic group, and a triplet energy of the second compound is about 2.5 electron volts or greater, and the electron injection layer includes a metal halide and a lanthanum-based metal.

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 ΔE.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.

Certain phosphonic acid salts heated at temperatures over 200° C. generate thermally stable, highly efficient flame retardant materials well suited for use as flame retardant additives in polymers. The flame retardants of the invention can be used as the sole flame retardant in a composition or in combination with other flame retardants, synergists or adjuvants.

Compounds useful as fluorescent or colored dyes are disclosed. The compounds have the following structure (I): ##STR00001##
or a stereoisomer, tautomer or salt thereof, wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, L.sup.1, L.sup.2, L.sup.3, L.sup.4, M.sup.1, M.sup.2, m and n are as defined herein. Methods associated with preparation and use of such compounds is also provided.

Flame retardants produced by heating certain phosphonic acid salts at temperatures over 200° C. are readily compounded into high temperature polyamides that are processed at temperatures above 270° C. to provide flame retardant, high temperature polyamide compositions.

The present application provides an electroluminescent material, a method for manufacturing the electroluminescent material, and a light emitting device, by employing an anthracene group and a triphenylphosphine oxide group, applying the molecule containing the anthracene group showing an excellent light emitting characteristic and two electron-deficient triphenylphosphine oxide groups located at the 6-position and 13-position of the anthracene group, an electroluminescent material, a method for manufacturing the electroluminescent material and a light emitting device with a blue light emitted and high luminous efficiency are achieved.

A polycyclic aromatic compound consisting of a substructure represented by Formula (1A) and at least two substructures represented by Formula (1B):

##STR00001##

(A to C ring is an aryl ring which may be substituted, R.sup.XD is an aryl which may be substituted and bonded to A ring via a dashed-line which is —X—, the substructure represented by Formula (1B) is bonded to a ring constituting atom of the aryl or heteroaryl ring in one selected from the group consisting of A ring, B ring and R.sup.XD, and C ring and R.sup.XE in another substructure represented by Formula (1B) at position *, C ring is bonded to the above-selected ring, R.sup.XE is an aryl which may be substituted and bonded to the above-selected ring or X, Y is B, X is >N—R (R is an aryl which may be substituted)) is useful as a material for an organic device.

The present invention provides a phosphorus-containing compound characterized by being a compound represented by the following structure: ##STR00001## the compound is a novel immune cell migration inhibitor. The compound has good hydrophilicity and can be developed into eye drops. The compound has a strong inhibitory ability to immune cell migration and can relieve the symptoms of most dry-eye patients.