33results about How to "Avoid concentration quenching" patented technology

The invention discloses an organic electroluminescent device, comprising a substrate, an anode layer and a cathode layer, wherein the anode layer or the cathode layer is positioned on the surface of the substrate. The organic electroluminescent device also comprises organic functional layers between the anode layer and the cathode layer. The organic functional layers at least include a luminescent layer which emits light by being driven by an applied power source. The luminescent material combines the organic fluorescent dye with the matrix molecules by chemical bonds by way of chemical crosslinking, so that energy transfer of the luminescent material is improved, thus not only avoiding the complex process caused by doping, but also avoiding the dye from being separated in the matrix molecules, optimizing the device structure and improving the luminescent efficiency, brightness and stability of the device.

Disclosed is a preparing method for organic white LED illumination light source with high color-rendering index and adjustable color temperature. Four dyes, including blue, green, yellow and red dyes, are selected. Either two dyes are capable of forming into a complementary color. Blue and yellow dyes are mixed in a light-emitting layer of one host material while green and red dyes are mixed in a light-emitting layer of another host material. By utilizing a preparation of a blue fluorescent material collocating with green and red phosphor materials, the host materials of the two color-complementing light-emitting layers are consistent. The host material selected for the light-emitting layer close to a positive pole has good hole-transmission capability while the host material selected for the light-emitting layer close to a negative pole has good electronic transmission capacity. The host material selected by the blue and yellow light layers is of a hole type, while the host material selected by the green and red light layers is of an electronic type. Manufactured is a white illumination light source with high color-rendering index and adjustable color temperature. Specific technical parameters are provided for manufacturing the illumination light source with high color-rendering index and adjustable color temperature.

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 invention relates to a preparation method of a silicone rubber composite material with fluorescence. The preparation method comprises the following steps: preparing mesoporous silicon dioxide SBA-15 by taking a polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer as a template and tetraethyl orthosilicate as a raw material; preparing a rare earth complex Eu(Pht)3Phen by taking europium oxide (Eu2O3), potassium hydrogen phthalate (KHPht) and 1,10-phenanthroline (Phen) as raw materials; mixing the rare earth complex Eu(Pht)3Phen with the mesoporous silicon dioxide SBA-15, stirring, performing ultrasonic dispersion, volatilizing the solvents, and performing vacuum drying to obtain the mixed powder Eu(Pht)3Phen/SBA-15; and blending the mixed powder Eu(Pht)3Phen/SBA-15 with silicone rubber by a two roll mill, and performing hot pressing and vulcanization to obtain the silicone rubber composite material with fluorescence. The silicone rubber composite material prepared by the invention shows characteristic fluorescence emission peaks of rare earth europium, and has the advantages of high fluorescence intensity, long fluorescence lifetime and the like.

The invention relates to a photoelectric material and a preparation method thereof, particularly to a fluorenyl aromatic phosphine oxide photoelectric material and a preparation method thereof, and aims at solving the problem that carrier injection transmission is unbalanced caused by the fact that aromatic hydrocarbon or arylamine functional groups with large conjugated structures are introduced into a fluorine system. The method includes preparing 2-bromine-(9,9-bis-(diphenylphosphine oxide) ) fluorine; and mixing the 2-bromine-(9,9-bis-(diphenylphosphine oxide) ) fluorine, tetrakis (triphenylphosphine) palladium, tetrabutylammonium bromide and borate and dissolving in tetrahydrofuran, adding in NaOH solution, and obtaining the photoelectric material after reaction, extraction, drying and column chromatography; or mixing the 2-bromine-(9,9-bis-(diphenylphosphine oxide) ) fluorine, carbazole, potassium carbonate, copper iodide and 18-crown-6-ether, adding in a high-temperature solvent, and obtaining the photoelectric material after reaction, extraction, drying and column chromatography. The power efficiency of the photoelectric material prepared through the method can reach 2.19lm/W when the material is used for preparing blue-ray fluorescent devices.

The present invention provides a novel amino-substituted polycyclic aromatic compound, a reactive compound, a polymer compound, a suspension type polymer compound, and a use using same. Specific aminogroups or specific substituents, such as Ra groups and Rb groups, are introduced into a polycyclic aromatic compound in which a plurality of aromatic rings are linked by boron atoms, oxygen atoms, orthe like, thereby increasing options for organic device materials such as organic EL element materials. In addition, by using such a novel amino-substituted polycyclic aromatic compound as a materialfor an organic EL element, it is possible to provide an organic EL element having, for example, excellent light emission efficiency or element life.

The synthesis and application of N-diphenylphosphoroxycarbazole-9-arylfluorene sterically hindered organic light-emitting materials relate to third-generation light-emitting display materials and technologies. The present invention is a kind of N-diphenylphosphoroxycarbazole The azole/9-arylfluorene sterically hindered organic light-emitting material has a specific design structure as follows: it specifically relates to the preparation method and application in organic light-emitting diode devices. The material has: (1) high triplet energy level; (2) excellent luminous efficiency, high thermal stability and stable amorphous form; (3) three-dimensional large-volume steric hindrance effect can effectively suppress quenching and The dimer emits light; (4) the synthesis method is simple and feasible. A blue organic electroluminescent device was prepared with its preliminary structure as the host material. It shows that this kind of compound has broad application prospect and potential commercial value in phosphorescent organic light-emitting diodes as host materials.

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 relates to an anthracene compound and an organic light emitting diode device. The structure of the anthracene compound is shown as a formula I in the specification. The invention provides the anthracene compound which takes a blue fluorescence unit which emits light through a TTA (triplet state triplet state electron annihilation) luminescence mechanism as a core (guest material unit), takes a flexible non-conjugated side chain L as a connecting unit and takes an arylamino or heteroarylamino structure (host structure unit) as a tail end. After the host material unit, the connecting unit L and the guest material unit are matched, and the anthracene compound has good hole transport capability and is suitable for preparing an OLED device by a solvent processing method.

The invention discloses near ultraviolet excited red fluorescent powder and a preparation method thereof, and belongs to the field of luminescent materials. The chemical formula of the fluorescent powder is La2SeO6: xEu<3+>, wherein x is larger than 0 and smaller than or equal to 0.2; the fluorescent powder is successfully prepared through a high-temperature solid-phase reaction method; in the doping concentration range, dipole and dipole interaction between Eu<3+> ions is reduced, so that concentration quenching is avoided; and the red fluorescent powder can emit red light at 616 nm under excitation of near ultraviolet light of 393 nm. The preparation method provided by the invention is simple in process, stable in product performance and suitable for industrial production.