57results about How to "Reduce non-radiative transitions" patented technology

The invention relates to a thermal activated delayed fluorescence material based on an arylboronic derivative and an organic electroluminescence device. The thermal activated delayed fluorescence material based on the arylboronic derivative has a structure shown as formula A. The invention also relates to the organic electroluminescence device which comprises a light-emitting layer, wherein the activated delayed fluorescence material is served as a luminescent dye in the light-emitting layer. A singlet state-triplet state energy gap of the thermal activated delayed fluorescence material is tiny; under room temperature, triplet excitons can be up-converted to triplet exciton luminescence through thermal activation; the thermal activated delayed fluorescence material is simply compounded andhas high luminescence efficiency, small concentration quenching effect and excellent dissolving property; the organic electroluminescence device based on the material can acquire higher efficiency and higher stability.

The invention discloses star-shaped tetraaryl ethylene compounds. In the invention, the star-shaped tetraaryl ethylene compounds with rigid frameworks are synthesized through molecular design, each compound molecule contains one or more tetraaryl ethylene groups, and the compounds have special luminescent properties, namely the properties that the compounds almost have no fluorescence in dilute solution and fluorescence is greatly enhanced in an aggregation state or solid state. The invention also discloses a preparation method for the star-shaped tetraaryl ethylene compounds. The compounds have higher decomposition temperature and high thermal stability, and can be used as organic fluorescent materials which are applied to devices. The structural general formula of the compounds is shownin the specification, wherein X and Y are positive integers and the sum of X and Y is equal to 6.

The invention discloses a fluorescence illuminating fluorescent material for detecting explosive, a preparing method and application, and belongs to the field of fluorescence sensors. A structural formula of the fluorescent material is as shown in formula I and formula II. When the structural formula is I, the fluorescent material is prepared by Suzuki coupling reaction of TPP and phenylboronic acid with different substituent groups at para-positions; a polymer is prepared by hydrosilylation of V-TPP and polymethylsiloxane; the fluorescent material is used for quantitative detection of the explosive and specific detecting steps comprise: dissolving the fluorescent material in a mixed solvent of tetrahydrofuran and water to obtain a fluorescent reagent; measuring the initial fluorescence intensity of the fluorescent reagent, then placing an explosive solution to be detected into the fluorescent reagent in sequence, uniformly stirring after adding every time, and instantly measuring the fluorescence intensity, wherein by comparing the change of the fluorescence intensity before and after the explosive solution is added, along with increment of the explosive, the fluorescence intensity of the fluorescent reagent is enhanced.

The invention relates to a W type antimony-based semiconductor laser with gradually varied Ga In proportion, which belongs to the technical field of semiconductor lasers. The existing InAs / GaInSb W type antimony-based semiconductor laser is difficult to realize luminescence at room temperature, and is less in output power of luminescence at low temperature (73K). The W type antimony-based semiconductor laser with gradually varied Ga In proportion sequentially comprises a GaSb substrate, a GaSb buffer layer, a P type GaSb contact layer, a P type quantum well, an intrinsic quantum well, an N type quantum well and an N type InAs contact layer from bottom to top, wherein the P type quantum well, the intrinsic quantum well and the N type quantum well respectively have a multi-period structure; the structure of each single-period quantum well in each multi-period structure is a sandwich structure that a GaInSb hole quantum well is clamped by double InAs electronic quantum wells; the outer layer is a pair of AlSb alloy limiting layers. The W type antimony-based semiconductor laser with gradually varied Ga In proportion is characterized in that the GaInSb hole quantum well is formed by 3 to 9 layers of Ga1-xInxSb layers, wherein x is equal to 0.05-0.35; the value of x of the Ga1-xInxSb layer in the middle is maximal; the Ga1-xInxSb layers on two sides are distributed in 1 to 4 levels from the middle to two sides; the values of x of two Ga1-xInxSb layers at the same level are the same, and the values of x of the Ga1-xInxSb layers from the middle to two sides are gradually reduced.

The invention discloses a chiral mononuclear nine-coordinated beta-diketone complex which has a molecular formula of Nd(tta)3L, wherein L is [(-)-2,6-bis(4,5-pinene-2-pyridyl)pyridine]; tta is a 1-thiophene trifluoromethyl1,3-butanedione anion. The preparation method of the chiral mononuclear nine-coordinated beta-diketone complex comprises the following steps: dissolving the 1-thiophene trifluoromethyl1,3-butanedione in absolute ethyl alcohol, adding ammonium hydroxide and a NdCl3.6H2O aqueous solution to generate precipitates, filtering, washing and drying to obtain Nd(tta)3.2H2O, adding an acetonitrile solution of the Nd(tta)3.2H2O into an acetone solution in which a trident nitrogenous chiral chelation organism L, stirring and filtering to obtain pink crystals after 3 days, and filtering, washing and drying to obtain the target product. As the preparation process is simple and the reaction is carried out at a normal temperature, the complex has favorable near-infrared luminescence property and is expected to serve as a near-infrared luminescence material which has wide application prospect in the aspects of lasers and the like.

The invention discloses organic optical iridium coordination compounds and application thereof in an organic electro-generated white or orange optical device. The orange optical iridium coordinate compounds have a structural formula as formula 1 or formula 2 which is shown in the specification, wherein R1 can be trifluoromethyl or pentafluoroethyl, R4 can be trifluoromethyl or pentafluoroethyl or R1=R4, R2 is selected from hydrogen, methyl, ethyl and halogen or halogen-substituted methyl or ethyl, R3 is independently selected from hydrogen, methyl, ethyl, halogen or halogen-substituted methyl or ethyl or R2=R3, and the halogen is fluorine, chlorine, bromine or iodine. The invention has the advantages as follows: a fluorine-containing modified iridium coordination compound can be used for effectively lowering vibrating frequency, reducing non-radiative transition and increasing electroluminescence efficiency; a film prepared by using a fluorine atom-containing modified coordination compound has better feature; self-quenching behaviors are restrained by steric hindrance of CF3; and charge transfer balance performance is increased by very good current carrier transmission performance, so that an efficient doped organic electro-generated luminescent device can be manufactured.

The invention discloses a pterene pyridazine tetradentate platinum complex phosphorescent material and its preparation method and application. The pterene-based pyridazine tetradentate platinum complex bridged by oxygen atoms has a general structural formula: Formula (I) represents. The tetradentate phosphorescent platinum complex of the present invention effectively suppresses the concentration quenching effect caused by intermolecular accumulation by introducing a rigid non-conjugated stereophenene structure that wraps the platinum nucleus on the ligand, and improves the platinum concentration to the greatest extent. Luminous efficiency and color purity of complex phosphorescent materials. The preparation method and the obtained pterene-modified pyridazine tetradentate platinum complex have high internal and external quantum yields, luminous brightness and stability. In the electroluminescence device of the present invention, the light-emitting layer is based on the pterene-modified pyridazine tetradentate platinum complex, which is prepared by a spin-coating film-forming method under specific conditions, and has low cost, simple operation, stable chemical properties, and luminescence. High brightness and efficiency contribute to the realization of highly efficient electroluminescent devices.