47results about How to "Strong red light emission" patented technology

The invention discloses a red phosphor and a preparation method thereof, the red phosphor has the chemical formula: M6Ln2-xEuxR2(PO4)6F2, wherein M is at least one of the alkaline earth metal ion group consisting of Ca2+, Sr2+ and Ba2+; Ln is rare earth metal ion selected from the group consisting of La3+, Gd3+ and Y3+; R is the alkaline earth metal ion selected from the group consisting of Na+ and K+; x is the coefficient of mole percent of doping element Eu in rare earth element Ln and is not less than 0.01 but not more than 0.90. Rare earth oxide, ammonium dihydrogen phosphate, alkaline (earth) metal carbonate and ammonium fluoride are mixed and then sintered in the atmosphere of CO at 950 DEG C or 1050 DEG C for 2 to 4 hours, and the product is obtained by grinding the sintered mixture. The resultant luminescent material can effectively absorb 147nm and 172nm vacuum ultraviolet lights, generate green emission with main emission peak at 618nm, and the emission intensity excited at 172nm is stronger than PDP red phosphor (Y, Gd) BO3:Eu3+(YGB). The resultant phosphor has the main emission at 618nm, which is better than chromaticity coordinate emitted at YGB 593nm. The resultant phosphor has high luminous intensity, high color purity and good chromaticity coordinate, and is suitable for serving as red light portion of the luminescent material for PDP and mercury-free fluorescent lamp.

The invention relates to the field of white light emitting diode, and discloses a preparation method of a high-color-purity red luminescent material for blue light excitation. The high-color-purity red luminescent material for blue light excitation comprises the following chemical constitutions: M<II>Ge(1-x)F6:xMn<4+>, wherein M<II> is selected from one or more of alkaline earth metal ions Ba<2+>, Sr<2+>, Ca<2+> and Mg<2+>; x is a molar percentage coefficient of the correspondingly doped Mn<4+> to Ge<4+> ions; x is larger than or equal to 0 and smaller than or equal to 0.10. The high-color-purity red luminescent material for blue light excitation is prepared with a hydrothermal method. The red florescent powder can be excited by blue light to irradiate 634 nm of red light with the high luminous efficiency and the good color purity.

The present invention discloses a rear-earth red-light-emitting material used for plasma display panels (PDP) and mercury-free fluorescent lamps. The expression of the chemical composition of the rear-earth red-light-emitting material is as follows: M(RE1-xEux)(PO3)4; wherein, M is alkali metal ion which is selected from Li, Na, K, Rb and Cs; RE is rear earth element which is selected from La<3 plus>, Gd<3 plus>, Y<3 plus> and Lu<3 plus>; Eu<3 plus> is an active ion; and x is the molar percentage content of luminous active ions relative to RE atoms, and the value range is 0.01 equal to or less than x equal to or less than 1.0. The preparation method is simple, and the prepared rear-earth red-light-emitting material used for PDPs and mercury-free fluorescent lamps is activated by vacuum ultraviolet (VUV) light to emit strong red light at 590nm, which is stronger than the red light emitted by the red fluorescent powder (Y, Gd)BO3 : Eu<3 plus> used in the prior plasma display panels, approximately 110 percent of the red light.

The invention relates to the synthesis technology of new luminescent materials, and is a new-type electrically neutral tridentate iridium [III] complex red light material and a preparation method thereof. It is a 6-[5-trifluoromethylpyrazole]-2,2'-bipyridine·2,6-diphenylpyridine iridium[III] complex. Under the protection of nitrogen, the trihydrate iridium trichloride [III] metal salt reagent and 6-[5-trifluoromethylpyridine]-2,2'-bipyridine tridentate chelate ligand were heated in ethanol, and the reaction The liquid was pumped dry for recrystallization, filtered, washed, and vacuum-dried to obtain an orange-yellow solid intermediate; in a nitrogen glove box, the orange-yellow intermediate, silver trifluoromethanesulfonate, and 2,6-diphenylpyridine ligand were uniformly mixed , ground into powder, heated, after the reaction solution was cooled to normal temperature, the filtrate was collected and dried to obtain the crude product, the crude product was separated, the second orange-red eluate was collected and dried, and vacuum-dried to obtain the final product, the yield was up to 30-68%.

The invention relates to the field of inorganic functional materials and discloses a Mn<4+> activated polyfluoride red luminous material capable of being effectively excited by blue light, and a preparation method of the material. A chemical composition of the Mn<4+> activated polyfluoride red luminescent material capable of being effectively excited by the blue light is Ba2M1-xF8:xMn<4+>, wherein M is Zr or Hf, x is a mole percentage coefficient of corresponding Mn<4+>-doped ions relative to M<4+> ions, and x is greater than 0 and less than or equal to 0.10. The red luminous material mainly emits red light of about 628nm under the excitation of the blue light, and is high in luminous efficiency. The preparation method of the blue light excited high-color-purity red oxyfluoride luminous material is a hydrothermal method, and a synthesis process is simple.

The invention provides fluoride red fluorescent powder for a blue-ray excited white-light LED and preparation and modification methods thereof. A general formula A2MF6: xMn<4+>, yBF is adopted to represent the material composition of the fluoride red fluorescent powder, wherein A and B independently represent Na or K respectively and are different, M is Ti or Si, x is equal to mMn/mM, x is greaterthan and or equal to 0 and smaller than or equal to 0.1, y is equal to mBF/mM, and y is greater than and or equal to 0 and smaller than or equal to 0.1. According to the preparation method of the fluoride red fluorescent powder for the blue-ray excited white-light LED, industrial and commercial raw materials are adopted, the process is simple, preparation is carried out at normal pressure and temperature, and therefore the preparation method of the fluoride red fluorescent powder for the blue-ray excited white-light LED is suitable for large-scale industrial production.

The invention discloses a double perovskite-type molybdate red phosphor and a preparation method thereof. A chemical formula of the phosphor is: (Ba1-x, Eux) 2MgMoO6, wherein x is greater than or equal to 0.01 and less than or equal to 0.2; and the red phosphor is prepared by using EDTA and citric acid as complexing agents through a sol-gel method. The double perovskite phosphor provided by the invention uses molybdate as a matrix, and uses Ba<2+> and Mg<2+> to occupy a A position and a B position respectively, a stable double perovskite structure is formed, the relative content of Eu<3+> instead of Ba<2+> (x is greater than or equal to 0.01 and less than or equal to 0.2) is adjusted to increase the intensity of red light emission, not only strong red light emission can be obtained under the excitation of a LED near ultraviolet chip, but also high intensity can be obtained under the excitation of a LED blue chip, the pure-phase double perovskite powder can be obtained at lower temperature in a shorter time, the production cycle is short, and the cost is low.

the invention discloses a rare earth organic red luminous material and preparing method of 390-420 nm luminous semiconductor chip in the luminous material domain of semiconductor diode, which displays Eubeta3Lx, wherein the Eu is rare earth iron Eu3+; beta is first organic ligand beta-diketone; L is second organic ligand with 2 nitrogen atoms or one oxygen atom as ligand atom; the molar rate of subscript 3 and x in the corresponding composition is x=1 or x=2. The preparing method comprises two steps: first, synthesizing Eubeta3 .2H2O complex; second, synthesizing Eubeta3Lx complex.

The invention discloses an aluminum gallate-based fluorescent material. The aluminum gallate-based fluorescent material adopts a chemical formula of M1-xAlyGazO4:xRE, wherein M is at least one of Ca (calcium), Sr (strontium) and Mg (magnesium); RE is at least one of Eu3+ (europium), Sm3+ (samarium) and Tb3+ (terbium); x, y and z are atom molar ratios of the elements in material composition, x is greater than 0 and is smaller than 0.15, y is greater than or equal to 0.8 and is smaller than or equal to 1.2, and z is greater than or equal to 0.8 and is smaller than or equal to 1.2. When Eu3+, Sm3+ and Tb3+ are singly doped, the obtained red fluorescent material, orange fluorescent material and green fluorescent material can be respectively excited at high efficiency in the 300-500nm waveband, and can be well matched with ultraviolet, near-ultraviolet chips or blue light chips. The aluminum gallate-based fluorescent material has the advantages that by adopting the same matrix material, the broadband multi-color emitting in the 500-700nm waveband can be realized, the wavebands of blue-green light, green light, orange light and red light are covered, the problem of instable light color caused by different attenuation rates of multiple matrixes in the same LED (light emitting diode) device is solved, and the light color stability and color rendering property of the LED are improved.

The invention relates to the field of white light emitting diodes, and discloses a preparation method for a red fluoride luminescent material which is suitable for blue light excitation, high in color purity and is activated by Mn4+. The red fluoride luminescent material which is suitable for blue light excitation and high in color purity is prepared from a chemical composition of A2X1-xF6 :xMn4+, wherein A is one or any combination of two from Na, K, Rb, and Cs; M is one or two of Ti, Si, Ge and Zr; x is a coefficient of the molar percentage of corresponding doped Mn4+ ions relative to X4+ ions, and x is larger than 0 and smaller than or equal to 0.10. When the related red luminescent material is excitated by blue light, red light with the wavelength of 633 nm or 627 nm is mainly emitted, the luminous efficiency is high, and the color purity is high. The related red luminescent material which is excitated by blue light and high in color purity is prepared through a micro-emulsion method. The preparation method is simple in synthetic process, convenient to operate and suitable for large-scale industrialized production.

The invention relates to the field of white light emitting diodes, and discloses a preparation method of a novel Mn<4+> doped high color purity red fluoride light emitting material suitable for blue light excitation, wherein the chemical composition is K3Zr1-xF7:xMn<4+>, x is the mole percent coefficient of the corresponding doped Mn<4+> ions relative to Zr<4+> ions, and x is more than 0 and is less than or equal to 0.10. According to the present invention, the red light emitting material mainly emits 627 nm red light under blue light excitation, the light emitting efficiency is high, and the color purity is good; the novel Mn<4+> doped high color purity red fluoride light emitting material is prepared by using the ion-exchange method; and the synthesis process of the preparation method is simple, and the preparation method is suitable for industrial large-scale production.

The invention relates to the field of white light emitting diodes, and discloses fluoride red phosphor used for a blue-light semiconductor light emitting diode and a preparation method of the fluoride red phosphor. The chemical composition of the fluoride red phosphor used for the blue-light semiconductor light emitting diode is K<2>M<1-x>F<7:x>Mn4+, wherein M is Nb or Ta, and x is the mole percentage coefficient of correspondingly doped Mn4+ ions to M5+ ions, and is larger than zero and no larger than 0.10. The red phosphor related in the invention mainly emits red light with the wave length being about 628 nm when being excited by blue light, and the luminous efficiency is high. The high-color-purity red fluoride luminescent material excited by blue light is prepared through an ion exchange method at a room temperature. The preparation method is simple in synthesizing process and suitable for industrial mass production.

The invention belongs to the field of fluorescent powder preparation, and particularly relates to red fluorescent powder capable of being used for blue light excitation of a white light LED and a preparation method of the red fluorescent powder, and the general formula of the combination ratio of the prepared red fluorescent powder is K2MF6: xMn < 4 + > (at) GQDs (ymg/mol), wherein M is Si or Ti; x is the mole fraction of Mn < 4 + > doping, and x is more than 0 and less than or equal to 0.06; the GQDs are green light graphene quantum dots; y is the content of GQDs in the red-light fluorescent powder, 0 < y < = 7, and the unit is mg/mol. The Mn < 4 + >-doped fluoride red-light fluorescent powder coated with the green-light graphene quantum dots can be excited by blue light emitted by an InGaN chip, has excellent high-temperature fluorescence performance, heat resistance and water resistance, and has a good market prospect.

The invention belongs to the technical field of preparation of fluorescent powder, and particularly relates to organic-inorganic hybrid fluorine titanium potassium red-light fluorescent powder, the general formula of which is K2TiF6: xMn < 4 + >, ytetaH < + >, tetaH < + > represents that triethylene tetramine is subjected to organic-inorganic hybridization, and triethylene tetramine exists in a protonation form after hybridization; x is the mole fraction of Mn < 4 + > doping, y is the mole fraction of triethylene tetramine doping, x is larger than or equal to 0.01 and smaller than or equal to 0.12, and y is larger than or equal to 0.0 and smaller than or equal to 0.15. The invention also provides a preparation method of the organic-inorganic hybrid potassium titanium fluoride red-light fluorescent powder, which comprises the following steps: (1) reacting triethylene tetramine with an H2TiF6 solution and a K2CO3 solution, and drying to obtain K2TiF6: ytetaH < + >; and (2) reacting KF. 2H2O with an HF solution, a K2MnF6 solution and K2TiF6: ytetaH < + >, sealing, standing, carrying out suction filtration, washing and drying to obtain the K2TiF6: xMn < 4 + >, ytetaH < + >. The obtained red-light fluorescent powder has the advantages of high luminescence, high intensity, water resistance, thermal stability and the like.

The invention belongs to the field of organic photoelectric functional materials, and particularly relates to a platinum complex with an aggregation-caused red light emitting function as well as a preparation method and an application of the platinum complex in organic electroluminescence and bioimaging fields. The platinum complex comprises a cyclometalated complex, a platinum center and an auxiliary ligand. The general structural formula is shown in the specification. The synthesis procedure of the platinum complex is simple, synthesis conditions are mild, the platinum complex seldom emits light in a solvent state but has a high red light emitting function in a solid state, and the platinum complex with the aggregation-caused red light emitting function can be applied to organic electroluminescence and biological imaging.

The invention relates to the field of white light emitting diodes, and discloses a method for preparing a novel Mn (IV) ion activated red luminescence material. The novel Mn (IV) ion activated red luminescence material disclosed by the invention has the chemical composition of AB4-xO9:xMn<4+>, wherein A refers to one or more of alkaline-earth metals ions such as Ba<2+>, Ca<2+> and Mg<2+>; B refers to one or more of alkaline-earth metals ions such as Ge<4+>, Ti<4+> and Zr<4+>; x refers to a molar percentage coefficient of correspondingly doped Mn<4+> relative to B<4+>; x is more than 0 and less than or equal to 0.10. The red luminescence material disclosed by the invention has the principle red emission of 667nm under blue light excitation and has high luminous efficiency. The novel Mn (IV) ion activated red luminescence material disclosed by the invention is prepared by a high temperature solid state method.

The invention belongs to the technical field of preparation of fluorescent powder, and particularly relates to red fluorescent powder excited by blue light, the general formula of which is Na2SiF6: xMn < 4 + >, yLi < + >-CA, wherein CA represents surface passivation with citric acid, x represents that x is greater than or equal to 0.01 and less than or equal to 0.14, and y represents that y is greater than or equal to 0.01 and less than or equal to 0.14. The invention also relates to a preparation method of the red-light fluorescent powder. The preparation method comprises the following steps: (1) preparing NaSiF6: yLi powder; (2) preparing Na2SiF6: xMn < 4 + >, yLi < + > red fluorescent powder crystals; and (3) preparing Na2SiF6: xMn < 4 + >, yLi < + >-CA red fluorescent powder crystals. The obtained red-light fluorescent powder has the characteristics of long-range good water resistance, high luminous intensity and thermal stability.

The invention relates to a preparation method of a red fluorescent powder for LED, which comprises the following steps: (1) dissolving a given amount of europium oxide in concentrated nitric acid; heating and stirring until the europium oxide is completely dissolved; continue heating for evaporation to dryness, and then adding deionized water to obtain a solution A; dissolving a given amount of sodium tungstate or ammonia tungstate in the deionized water to obtain a solution B; (2) dropwise adding the solution B to the solution A and continuously stirring to obtain a white turbid solution, and then adding a salpeter solution or a sodium hydroxide solution to the white turbid solution to regulate the pH value to 2-4; (3) filling the white turbid solution to a high pressure kettle, heating to 170-240 DEG C, preserving heat for 20-72 hours, and naturally cooling to the room temperature; and (4) filtering and drying obtained products to obtain the red fluorescent powder. The invention hassimple process, is easy to implement and can reduce the probability of introducing impurities; the preparation process of the preparation method requires simple equipment, has high reaction speed andis more suitable for large-scale production.

The invention discloses a preparation method and application of a benzoquinoline ratio type near-infrared fluorescent molecular probe capable of being used for fluorine ion detection. The chemical structural formula of the benzoquinoline ratio type near-infrared fluorescent molecular probe is formula I shown in the specification. The ratio type fluorescent probe takes a 10-hydroxybenzo[H]quinoline derivative as a parent structure, and the detection of fluorine ions in a pure water system and a biological system is realized based on an ESIPT mechanism. The maximum emission wavelength of the probe molecule in a PBS buffer solution is 498 nm, after fluorine ions are added, the maximum emission wavelength of the probe is subjected to red shift to 637 nm and is in a near-infrared region, and the interference of biological autofluorescence can be effectively avoided. Meanwhile, the fluorescent molecular probe disclosed by the invention is good in water solubility, high in sensitivity and strong in specificity, and has a relatively strong practical application value in the fields of environment and life science.