30results about How to "Lower concentration quenching" patented technology

The invention discloses a multi-mode excited single red light nano fluorescent material and a preparation method thereof. The steps are as follows: (1) YbCl with a concentration of 0.5-2.5mmol / ml is respectively prepared 3 , ErCl 3 , MnCl 2 and NaF aqueous solution; (2) Dissolve 0.3g NaOH in 2-6ml deionized water, add 5-15ml ethanol, 5-15ml oleic acid, and stir; (3) Separately mix YbCl 3 , ErCl 3 and MnCl 2 Add the solution to step (2) and stir; (4) Add 1‑3mmol NaF to the solution in step (3) and stir; (5) Transfer the solution in step (4) to an autoclave, After reacting at ℃ for 100-400 minutes, the fluorescent product is obtained; (6) After the fluorescent product in step (5) cools down to room temperature, centrifuge and wash to obtain the product.

The invention provides organic-inorganic compound fluorescent powder, a manufacturing method and application thereof. The method comprises the following steps of: immerging porous glass into the solution of an organic fluorescent material; taking the porous glass out after the porous glass absorbs the solution of the organic fluorescent material; and smashing the porous glass which absorbs the solution of the organic fluorescent material. The organic-inorganic compound fluorescent powder is prepared by the manufacturing method. The organic-inorganic compound fluorescent powder can be made into a light-emitting device by matching a semiconductor light-emitting diode in the range of between 200 and 550nm. The organic-inorganic compound fluorescent powder of the invention has a simple manufacturing process, can be doped into an encapsulating material of the semiconductor light-emitting diode, and solves the problem of a photochemical reaction between an organic light-emitting material and an organic encapsulating material.

The invention discloses a discenyl-containing phosphorescent iridium complex, a preparation method thereof and an electroluminescent device, belonging to the field of organic photoelectric materials. The 1-formyl tripcene is dissolved in a dry organic solvent, and under the protection of an inert gas and the presence of a catalyst, it undergoes condensation reaction with an ortho-amino compound to obtain a cyclometallation ligand containing a diene structure. IrCl 3 Dissolve in water, add a cyclometalation ligand containing a diene structure and an organic solvent, and stir under the protection of an inert gas to obtain a dichloro bridge intermediate of iridium. The dichloro bridge intermediate of iridium is dissolved in an organic solvent, and the corresponding auxiliary ligand (L^X) is stirred under nitrogen protection under the action of a base to obtain a discenyl iridium complex. Aiming at the problem that the discene-based iridium complexes in the prior art are not suitable for application in organic electroluminescent devices, the present invention uses the discene-wrapped phosphorescent material and uses it as the light-emitting layer doped in OLED devices to achieve High doping concentration, good spectral stability and high efficiency.

The invention belongs to the field of organic electroluminescent materials and relates to a fluorene and spiro-fluorene substituted phenylpyridine iridium complex and a preparation method and application thereof. The preparation method comprises the following steps of: synthesizing various fluorene and spiro-fluorene substituted phenylpyridine iridium ligands; reacting the ligands with iridium(III) chloride hydrate (IrCl3.3H2O) to obtain a chlorine-bridged dimer intermediate; and reacting the intermediate with acetylacetone in a proper solvent to obtain the fluorene and spiro-fluorene substituted phenylpyridine iridium complex. The iridium complex can change types and positions of the substituent of phenyl in a bidentateligand, can adjust luminous wavelength in a certain range and can be widely applied in the field of organic electroluminescence.

The invention discloses a difunctional solid-state broadband red light emission organic light-emitting material having a structure shown in a formula I and a preparation method thereof. According to the solid-state broadband red light emission organic light-emitting material and the preparation method thereof disclosed by the invention, novel solid-state broadband red light emission piperidone organic light-emitting material with upconversion fluorescence characteristic are formed by combining piperidone with fluoro-phenylindole functional structure units through polyene bridged bonds. The difunctional solid-state broadband red light emission organic light-emitting materials provided by the invention have the characteristics of solid-state broadband red light emission and upconversion fluorescence, stable molecular structure, multiple functions, convenience in use and high practicality. (The formula I is shown in the description).

The invention discloses a fluoro phenylindole compound which adopts a structure shown in formula I, application of the fluoro phenylindole compound as a red organic luminescent material, and a preparation method of the fluoro phenylindole compound. The fluoro phenylindole compound is obtained through a reaction between cyclohexanone and 3-(3-(4-fluorophenyl)-1-isopropyl-1H-indole-2-yl) acrolein under an alkaline condition. The preparation method is simple to operate, convenient for synthesis and easy for purification; the obtained fluoro phenylindole compound is stable in structure and can be utilized for fluorescence conversion on a strong red color displayed under 800-nm laser excitation, thereby having potential application values in such fields as luminescent equipment, anti-counterfeit technologies, laser dye and fluorescence sensing; the research field of the fluoro phenylindole compound is expanded.

The present invention provides a YAG:Mn red phosphor, a preparation method and applications thereof. According to the present invention, the developed red phosphor can be effectively used in white light LED; the chemical general formula of the phosphor is RE(3-y)Al(5-x-z)O12:xMn<4+> / yCa<2+> / zME, wherein RE is one or a plurality of materials selected from Y<3+>, Lu<3+> and Gd<3+>, ME is one or two selected from Mg<2+> and Ge<4+>, x is 0.001-0.2, y is 0-0.8, z is 0-0.8, and y and z are not simultaneously 0; and the ions such as Mg<2+>, Ca<2+> and Ge<4+> are co-doped as the valence compensation ions so as to increase the luminous efficiency.

The invention discloses a solution-processable dendritic iridium complex electroluminescence material and a synthesis method thereof. This type of molecular structure consists of two parts, one part is the iridium complex with room temperature phosphorescence properties as the luminescent core; the other part is the group with high triplet energy level as the peripheral dendritic group, and the two parts are formed by non-conjugated groups. to connect. The molecule has the structure shown below, where, C 1 -C 3 For ionic dendritic iridium complexes, C 4 -C 6 It is a neutral dendritic iridium complex with a similar structure. Both R1 and R2 are high triplet energy level groups capped by non-conjugated groups. The invention can improve the problems of synthesis, purification, device preparation process and cost of iridium complex materials in wet preparation devices.

The invention discloses an aromatic amine derivative containing a benzophenone group and its preparation method and application. The aromatic amine derivative containing a benzophenone group provided by the invention has a unique triphenylamine group and benzene The ketone group has TICT and AIE effects, high luminous intensity, and good hole transport ability, and can be used as a new type of soluble luminescent molecule with good performance, low cost, and highly distorted spatial structure. The aromatic amine derivatives can be widely used in the fields of color display and solid-state lighting for the preparation of light-emitting materials, light-emitting devices or smart materials. When used as OLEDs, the aromatic amine derivatives containing benzophenone groups are used as the main material , using the phosphorescent material as the guest material can reduce the concentration quenching of the phosphorescent material, improve the external quantum efficiency of the device, and reduce the efficiency roll-off.

The invention discloses a pyridazine iridium complex containing an alkyl steric hindrance group, a preparation method and an application thereof, and belongs to the field of organic photoelectric materials. The method solves the problems in the prior art that the preparation of the pyridazine tricyclometalated iridium complexes requires expensive raw materials or the raw materials have poor adaptability and the problem that the luminescence concentration of the iridium complexes is obviously quenched. The general structural formula of the pyridazine iridium complex containing an alkyl hindering group of the present invention is shown in formula (1), and the preparation method is: first synthesize a pyridazine ligand containing a bicycloalkyl group, and then synthesize the bicycloalkyl group The pyridazine ligand and IrCl 3 .(tht) 3 The reaction generates pyridazine tricyclic metallized iridium complexes, the concentration quenching of the obtained iridium complexes is significantly reduced, and the doping concentration of the organic electronic light-emitting device prepared thereby is greatly increased.

The invention discloses multifunctional group pyridazinone compounds, an application of the multifunctional group pyridazinone compounds serving as an orange organic light-emitting material and a preparation method of the multifunctional group pyridazinone compounds. Multiple functional structure units of anthryl, butadienyl, quinoxaline, pyridazinone and the like are effectively combined in one molecule, and one double-anthryl and butadienyl contained functional quinoxaline pyridazinone organic light emitting molecule is formed. According to the molecular structure, double anthryl (electron donor) for supplying electrons and one electron-deficient quinoxaline group (electron acceptor) exist in the molecule, three parts are connected through two butadiene structure units, and a larger and more extended D-pi-A-pi-D conjugated system is formed, and effective intramolecular charge transfer can be generated, so that enhancement of the up-conversion luminescence performance of organic materials is facilitated. The invention expands the field of research and application of the multifunctional group pyridazinone compounds.

The invention discloses alkali metal bismuth gallate infrared optical glass a preparation method. The main components of the glass include Bi2O3, Ga2O3, La2O3 and R2O. The preparation method includes: firstly, powders of every component are mixed evenly, heated to be at 1000-1300 degree Celsius and kept for 2-5 hours; secondly, melt is poured in a mold and is cooled naturally; thirdly, a formed glass sample is annealed, kept for 20-30 hours under the temperature of 300-400 degree Celsius, and then cooled to be at room temperature. The obtained glass has wider infrared transmission characteristics, good thermal stability and larger refractive index. The transmission range can reach to 0.5-7 Mu m, and the difference Delta T between the crystallization temperature and the transition temperature can reach to 150 degree Celsius. The refractive index can reach to 2.4-2.5 according to different components. The invention is applied to the optical fields of infrared detection, optical communication, etc.

The invention discloses ground limestone-based bismuth and europium co-doped yellow fluorescent powder. According to the fluorescent powder, ground limestone is used as matrix, EU<3+> is used as an activating agent, Bi<3+> ions are used as a sensitizing agent, and alkali carbonate is used as a fluxing agent and a charge compensation agent; and the molar ratio of ground limestone to EU<3+> to Bi<3+> to M2CO3 is 100:(1-5):(1-15):(0.5-2.5), wherein M is one or more of Li<+>, Na<+> or K<+>. The invention also discloses a preparation method for the ground limestone-based bismuth and europium co-doped yellow fluorescent powder; and the preparation method comprises the following steps of: accurately weighing raw materials, fully grinding the raw materials in a ball grinding mill, mixing uniformly to form powder and thus obtaining precursor, pre-treating in a high-temperature furnace, grinding, calcining the precursor at CO2 atmosphere of standard atmospheric pressure, and grinding to obtain a sample. The provided preparation method for the fluorescent powder is simple, and the fluorescent powder is stable in performance, and high in luminous intensity and has important application value.

The invention discloses a solid broadband green-light emission crystal material which is as shown in a formula I. Indole and pyrazolone serving as functional structure units are combined through an aza butadiene bridge bond phase to form a bis-heterocyclic organic light-emitting crystal material of aza butadiene bridging. The material has good green-light emission characteristics in crystalline state and solution. The material serving as an organic light-emitting material is used for the fields of light-emitting devices, laser dyes, fluorescence sensing, anti-counterfeiting techniques and biomedical analysis.

The invention discloses a heat-activated delayed fluorescent material capable of solution processing and a preparation method thereof. This type of molecular structure is composed of two parts, one part is a core with thermally activated delayed fluorescence properties, and the other part is a group with a high triplet energy level connected by an alkyl chain, and has a structure as shown in formula I, formula I, wherein , R 1 , R 2 At most one of them is hydrogen, and the rest are groups with high triplet energy levels linked by alkyl chains. The advantages of this new material: the steric hindrance effect of the peripheral branch chain can effectively reduce the concentration quenching of the triplet excitons and improve the performance of the light-emitting device; the introduction of the alkyl chain can effectively enhance the solubility and film-forming properties of the material. The results show that this kind of solution-processable heat-activated delayed fluorescent material has relatively large molecular weight and good film-forming performance, and is suitable for wet preparation of organic electroluminescent devices. And with the increase of peripheral branch chains, the performance of the device is greatly improved.

The invention discloses a fluorinated pheoylquinoline and phosphine oxide material with double functions of flame retardancy and light emitting shown in formula I and a preparation method thereof. A novel fluorinated pheoylquinoline and phosphine oxide compound with double functions of flame retardancy and light emitting is formed by combining two functional structure units, such as cyclopropyl fluorinated pheoylquinoline and phosphine oxide groups, so that a new variety of flame retardant agent and ultraviolet light emitting material is increased. The preparation method has the advantages that the technology is simple, the safety and environment-friendly effects are realized, and the preparation method is suitable for industrial production. The prepared luorinated pheoylquinoline and phosphine oxide material with double functions of flame retardancy and light emitting shown has the advantages that the dissolvability is good, the thermal stability and chemical stability are high, the processing property is good, the double functions of flame retardancy and light emitting are realized, the multi-element synergistic action of fluorine, phosphor and nitrogen is realized, the better flame-retardant efficiency is realized, the excellent solid ultraviolet light emitting characteristic is realized, and the application range is wide.