The present invention relates to a phosphine precursor for the preparation of a quantum dot, and a quantum dot prepared therefrom. Using the phosphine precursor for the preparation of a quantum dot of the present invention, a quantum dot with improved luminous efficiency and higher luminous color purity can be provided.

The present invention provides a compound having a low melting point, enhanced volatility, and excellent thermal stability, and a method for producing a lithium-containing film. The compound is represented by the following formula (1).

##STR00001##

(In the formula (1), A is a nitrogen atom, a phosphorus atom, a boron atom, or an aluminum atom; E.sub.1 and E.sub.2 are independently a carbon atom, a silicon atom, a germanium atom, or a tin atom; R.sub.1 to R.sub.6 are independently a hydrogen atom or a C1-10 hydrocarbon group having a constituent atom optionally substituted with a heteroatom; however, all of R.sub.1 to R.sub.6 may not be a hydrogen atom; D is a monodentate or polydentate neutral ligand structure; x is 0 or an integer of 1 or greater, and y is an integer of 1 or greater; however, if A is a nitrogen atom and none of the carbon atoms constituting R.sub.1 to R.sub.6 is substituted with a heteroatom, x is a number of 1 or greater and y is a number of 1 or greater; and if there are more than one of A, E.sub.1, E.sub.2, and R.sub.1 to R.sub.6, these may be the same or different.)

The present invention provides a compound having a low melting point, enhanced volatility, and excellent thermal stability, and a method for producing a lithium-containing film. The compound is represented by the following formula (1).

##STR00001##

(In the formula (1), A is a nitrogen atom, a phosphorus atom, a boron atom, or an aluminum atom; E.sub.1 and E.sub.2 are independently a carbon atom, a silicon atom, a germanium atom, or a tin atom; R.sub.1 to R.sub.6 are independently a hydrogen atom or a C1-10 hydrocarbon group having a constituent atom optionally substituted with a heteroatom; however, all of R.sub.1 to R.sub.6 may not be a hydrogen atom; D is a monodentate or polydentate neutral ligand structure; x is 0 or an integer of 1 or greater, and y is an integer of 1 or greater; however, if A is a nitrogen atom and none of the carbon atoms constituting R.sub.1 to R.sub.6 is substituted with a heteroatom, x is a number of 1 or greater and y is a number of 1 or greater; and if there are more than one of A, E.sub.1, E.sub.2, and R.sub.1 to R.sub.6, these may be the same or different.)

Disclosed are a polyolefin having a high molecular weight by using a novel metallocene catalyst; a method for preparing the polyolefin by using the same; and a method for preparing an ethylene-propylene random copolymer having high molecular weight, high syndiotacticity and small crystal size, thereby providing injection molded articles with improved transparency. The present invention provides a transition metal compound represented by chemical formula 1: ##STR00001##

Disclosed are a polyolefin having a high molecular weight by using a novel metallocene catalyst; a method for preparing the polyolefin by using the same; and a method for preparing an ethylene-propylene random copolymer having high molecular weight, high syndiotacticity and small crystal size, thereby providing injection molded articles with improved transparency. The present invention provides a transition metal compound represented by chemical formula 1: ##STR00001##

Metal ion-directed carboxylic acid functionalized polyoxometalate hybrid compounds, and their preparation method and applications in catalyzing the degradation of chemical warfare agent simulants. In the synthesis, Na.sub.2MoO.sub.4, p-hydroxybenzonic acid (PHBA), alanine (Ala), KCl, transition metal cations and As.sub.2O.sub.3 as raw materials and water are used as solvent. At room temperature, 2-chloroethyl ethyl sulfide (CEES) and the prepared polyoxometalate hybrid compounds were mixed together in anhydrous ethanol and stirred, and H.sub.2O.sub.2 was subsequently added into the reaction system. The catalytic reaction for the degradation of CEES was finished within 5 min under stirring. In the catalytic hydrolysis of diethyl cyanophosphonate (DECP), the catalyst, DECP, DMF and H.sub.2O were put together and mixed fully. The prepared polyoxometalate hybrid compounds have the advantages of high conversion, high selectivity and easy recyclability in catalyzing the degradation of two types of chemical warfare agent simulant.

The present disclosure pertains to a color filter for a display device, which has at least one color filter element for generating a predefined color in response to incident light, wherein the at least one color filter element includes a Perovskite material.

The present disclosure pertains to a color filter for a display device, which has at least one color filter element for generating a predefined color in response to incident light, wherein the at least one color filter element includes a Perovskite material.

Provided is a high-entropy composite glycerate represented by NiCrFeCoMn(C.sub.3H.sub.5O.sub.4).sub.n and an electrocatalyst thereof, wherein n is a positive integer from 1 to 3, and wherein each of the Ni, Cr, Fe, Co and Mn includes an atom percent of 5 to 35 based on the total amount of the Ni, Cr, Fe, Co and Mn. Each of the metals is homogenously distributed within the high-entropy composite glycerate, and the high-entropy composite glycerate can reduce an overpotential for oxygen evolution reaction by the synergistic effect resulting from the structure formed by the quinary-metal glycerate. The high-entropy composite glycerate is suitable for catalyzing oxygen evolution reaction, and therefore has a prospect for application. Methods for preparing the high-entropy composite glycerate are also provided.

Provided is a high-entropy composite glycerate represented by NiCrFeCoMn(C.sub.3H.sub.5O.sub.4).sub.n and an electrocatalyst thereof, wherein n is a positive integer from 1 to 3, and wherein each of the Ni, Cr, Fe, Co and Mn includes an atom percent of 5 to 35 based on the total amount of the Ni, Cr, Fe, Co and Mn. Each of the metals is homogenously distributed within the high-entropy composite glycerate, and the high-entropy composite glycerate can reduce an overpotential for oxygen evolution reaction by the synergistic effect resulting from the structure formed by the quinary-metal glycerate. The high-entropy composite glycerate is suitable for catalyzing oxygen evolution reaction, and therefore has a prospect for application. Methods for preparing the high-entropy composite glycerate are also provided.