233 results about "Caesium carbonate" patented technology

The invention provides a low-voltage and high-efficiency organic LED. The low-voltage and high-efficiency organic LED comprises a glass substrate with an ITO, a hole-transmission layer, a p type doped luminescence layer, an i type intrinsic luminescence layer, an n type doped luminescence layer, an electronic transmission layer, a composite electron injection layer and a cathode which are sequentially overlapped to form an overlapping layer; the p type doped luminescence layer is prepared through hole transmission material in which blue fluorescent dye is doped; the i type intrinsic luminescence is prepared through blue fluorescent dye; the n type doped luminescence layer is prepared through the electron transmission material in which blue fluorescent dye is doped; the three luminescence layers are named p-i-n type luminescence layer; and the composite electronic injection layer is prepared through cesium carbonate in which a thin aluminum layer is inserted. The low-voltage and high-efficiency organic LED has the advantages that the composite electron injection layer with a thin aluminum layer inserted into the cesium carbonate layer and the p-i-n type luminescence layer are arranged, so that the luminescence efficiency is improved, and the reduction of the efficiency is delayed; the driving voltage is low, the luminance is high, the efficiency is high, the stability is improved, and the preparation process is simple.

The invention discloses a CsPbX3 quantum dot room temperature synthetic method. The CsPbX3 quantum dot room temperature synthetic method comprises the following steps: dissolving cesium carbonate in alkyl chain organic acid to prepare a cesium precursor; dissolving lead bromide and branched-chain organic ammonium bromide in toluene, and carrying out stirring and dissolution in room-temperature airto obtain a lead precursor; dissolving DDAB (Didodecyl Dimethyl Ammonium Bromide) in the toluene to obtain a DDAB solution; injecting the cesium precursor into the lead precursor and carrying out stirring reaction to obtain an intermediate; adding the DDAB solution into the obtained intermediate, and carrying out stirring reaction to obtain a CsPbX3 quantum dot stock solution; adding the obtainedCsPbX3 quantum dot stock solution into a purifying solvent for centrifugation; then dispersing in an organic solvent to obtain CsPbX3 quantum dots. According to the CsPbX3 quantum dot room temperature synthetic method disclosed by the invention, the CsPbX3 quantum dot with excellent luminescence property is synthesized under room temperature by utilizing the synergism matching of three ligands, the quantum yield of an ink dispersion solution exceeds 90 percent, and meanwhile, the CsPbX3 quantum dot room temperature synthetic method also has radiative recombination of single channels.

The invention relates to a modified cobalt manganese binary metal oxide catalyst. The modified cobalt manganese binary metal oxide catalyst can be prepared by the following steps: synthesizing a cobalt manganese binary metal hydroxide by a weak base precipitation method, wherein the mass ratio of cobalt to manganese is (4.0-14.0):1; roasting at the temperature of 350 DEG C-550 DEG C so as to prepare a cobalt manganese binary metal oxide; impregnating the cobalt manganese binary metal oxide by auxiliary solutions of potassium carbonate, potassium oxalate or cesium carbonate and the like in equal volume; drying the cobalt manganese binary metal oxide which is impregnated by the auxiliaries at the temperature of 70 DEG C-90 DEG C; roasting the dried cobalt manganese binary metal oxide at the temperature of 350 DEG C-550 DEG C so as to obtain the modified cobalt manganese binary metal oxide catalyst. The raw materials for preparing the catalyst are all inorganic compounds and are harmless to human bodies and environments; moreover, the catalyst is simple in formation, can control preparation technological parameters, is high in activity of the catalyst, and has high cost performance.

The invention provides an inorganic lead halide perovskite quantum dot, a preparation method of the quantum dot, a self-assembly nanowire and a preparation method of the nanowire. The preparation method of the inorganic lead halide perovskite quantum dot comprises the steps of adding cesium carbonate, lead halide, oleic acid, oleylamine and octadecene into a container to form a precursor solution,allowing a mole ratio of cesium carbonate to lead halide to be 1:(2-4), allowing a volume ratio of oleic acid, oleylamine and octadecene to be 1:1:(18-22), when adding 1mmol cesium carbonate, adding0.5ml oleic acid correspondingly, performing ultrasound treatment on the precursor solution, and centrifuging the precursor solution to form supernate, namely dispersing liquid of the inorganic lead halide perovskite quantum dot. The method is simple in preparation process, low in energy consumption, high in yield and facilitates massive production.

The invention relates to a method for producing a halogenated caesium lead material that is obtained based on solid-liquid two-phase chemical reaction of a halogenated ammonium lead material and cesium carbonate and has advantages of low production cost, high stability and easy dispersion. A halogenated ammonium lead, cesium carbonate, and C1-C4 fatty alcohol are mixed uniformly according to a molar ratio 1 to 0.5-0.55 to 10-20; while heating is carried out slowly at a temperature of 70 to 110 DEG C, reaction is carried out for 2 to 6 hours, so that the cesium carbonate reacts with the halogenated ammonium lead material to obtain a halogenated caesium lead material and ammonium carbonate as a by product decomposes and volatilizes; and a reaction product is cooled to be reach a temperature of 50 to 60 DEG C, a polar solvent as a cosolvent of a halogenated caesium lead crystal and silicone oil as a surface treating agent are added, a supernatant solution is stirred continuous for 6 to 12 hours, thereby forming a halogenated caesium lead crystal particle with characteristics of uniform particle diameter and surface hydrophobicity. The method provided by the invention has characteristics of simple process and secure environment protection and is easy to expanded produce and industrial produce. The product obtained by using the method can be used as a material for a light absorption layer of a perovskite solar cell and a material of a hole transport layer.

A photovoltaic conversion element (10) has a construction wherein an electron transport layer (40), a conduction zone bottom end energy adjustment layer (50), a photovoltaic conversion layer (60) and a positive hole transport layer (70) are sandwiched in this order between a first electrode (30) and a second electrode (80). The conduction zone bottom end energy adjustment layer (50) is formed by for example caesium carbonate. Also, the electron transport layer (40) is formed of zinc acetate.

The invention discloses a preparation method of 2-methyl-8-aminoquinoline. The preparation method of 2-methyl-8-aminoquinoline comprises the step of ammoniating 2-methyl-8-bromoquinoline in a solvent at 60-120 DEG C under the action of catalyst and strong alkali to obtain the 2-methyl-8-aminoquinoline, wherein the catalyst is one or more selected out of copper acetylacetonate, iron acetylacetonate, cobalt acetylacetonate and zinc acetylacetonate, the solvent used is one or more selected out of dimethylsulfoxide, N, N-dimethylformamide, acetylacetone, tetrahydrofuran and N-methylpyrrolidone, and the strong alkali is one or more selected out of caesium carbonate, caesium hydroxide, potassium carbonate and potassium hydroxide. The preparation method of the intermediate 2-methyl-8-bromoquinoline comprises the step of performing a cyclization reaction on o-bromoaniline and crotonic aldehyde in a solvent in the presence of oxidant and mollient, so as to obtain the 2-methyl-8-bromoquinoline, wherein the oxidant is selected out of one or more of nitrobenzene, 2-nitrobromobenzene, ammonium ceric nitrate, vanadic acid and iron oxide, the mollient is selected out of one or more of glacial acetic acid, hydrochloric acid, ferrous sulfate and boric acid, and the solvent is selected out of one or more of hydrochloric acid, sulfuric acid and chlorobenzene.

This method is for preparing salts of amphotericin B methyl ester and other polyene macrolide esters. The steps of the process involve methylation by use of cesium carbonate for converting to methyl ester and significantly reducing side products, which are over methylation products. The free base-Schiff base mixture is converted to amphotericin B methyl ester hydrochloride or some other salt form, by using tetrahydrofuran-water to dissolve the mixture for acid treatment to obtain the salt. The aldehyde liberated during salt formation is removed by centrifuging, as to any precipitated aldehyde, and the aldehyde remaining in solution is removed by eluting the solution through a reverse phase adsorbent to obtain amphotericin B methyl ester hydrochloride as a yellow powder.

The invention provides a method for synthesizing aromatic amine. A reaction formula is shown in the specifications, wherein when X is nitrogen, a substituent group R can be 3- / 5-nitro, 3- / 5-cyan, 3- / 5-trifluoromethyl or 3- / 5-halo (fluorine, chlorine, bromine or iodine); when X is carbon, R can be 2- / 4-nitro, 2- / 4-cyan, 2- / 4-trifluoromethyl or 2-nitro-4-chlorine; R1 and R2 refer to hydrogen, alkyl, alkyl alcohol, benzyl or-(CH2)n-(n=2-6) naphthenic base respectively; reaction alkali is caesium carbonate, potassium phosphate, pyridine, triethylamine, sodium bicarbonate, potassium carbonate, sodium / potassium hydroxide or sodium / potassium alkoxide; a reaction solvent is dioxane, toluol, dimethyl sulfoxide, dimethyl formamide, acetonitrile, tetrahydrofuran or acetone; and the reaction is implemented in the conventional heating state. In the method, raw materials are readily available, the process is simple, the reaction condition is mild, the application range is wide, and a plurality of aromatic amine compounds can be synthesized by different substrates.

The invention discloses a metal indium-doped CsPbBr3 perovskite quantum dot photocatalyst. The photocatalyst is characterized in that halogen perovskite quantum dots are used as a carrier, and metal indium is doped in the halogen perovskite quantum dots to serve as an active center. A preparation method of the photocatalyst comprises the following steps: S1, preparing a precursor solution containing metal indium and lead bromide; S2, preparing a cesium carbonate precursor solution; S3, rapidly injecting the cesium carbonate precursor solution into the precursor solution containing the metal indium and the lead bromide for a reaction, conducting cooling in an ice bath, and then terminating the reaction; S4, exchanging a ligand on the surface of a catalyst through repeated washing of methylbenzene and acetone; and S5, conducting drying in a continuous vacuumizing state to obtain the photocatalyst. The photocatalytic carbon dioxide reduction performance of the metal indium-doped CsPbBr3 perovskite quantum dot photocatalyst disclosed by the invention is 1.48 to 3.25 times the photocatalytic carbon dioxide reduction performance of a pure-phase CsPbBr3 perovskite quantum dot photocatalyst, and the stability of the CsPbBr3 perovskite quantum dot photocatalyst is greatly improved.

Methods to recover or separate cesium formate or rubidium formate or both from a mixed alkali metal formate blend are described. One method involves adding cesium sulfate or rubidium sulfate to the mixed alkali metal formate blend in order to preferentially precipitate potassium sulfate from the mixed alkali metal formate blend. Another method involves adding cesium carbonate or cesium bicarbonate or both to preferentially precipitate potassium carbonate / bicarbonate and / or other non-cesium or non-rubidium metals from the mixed alkali metal blend. Further optional steps are also described. Still one other method involves converting cesium sulfate to cesium hydroxide.