345 results about "Manganese doping" patented technology

The present relates in general to upconversion luminescence (“UCL”) materials and methods of making and using same and more particularly, but not meant to be limiting, to Mn2+ doped semiconductor nanoparticles for use as UCL materials. The present invention also relates in general to upconversion luminescence including two-photon absorption upconversion, and potential applications using UCL materials, including light emitting diodes, upconversion lasers, infrared detectors, chemical sensors, temperature sensors and biological labels, all of which incorporate a UCL material.

A phosphor material contains encapsulated particles of manganese (Mn4+) doped fluoride phosphor. A method of encapsulating such particles is also provided. Each particle is encapsulated with a layer of a manganese-free fluoride phosphor. The use of such a phosphor material in a lighting apparatus results in improved stability and acceptable lumen maintenance over the course of the apparatus life.

The present relates in general to upconversion luminescence (“UCL”) materials and methods of making and using same and more particularly, but not meant to be limiting, to Mn2+ doped semiconductor nanoparticles for use as UCL materials. The present invention also relates in general to upconversion luminescence including two-photon absorption upconversion, and potential applications using UCL materials, including light emitting diodes, upconversion lasers, infrared detectors, chemical sensors, temperature sensors and biological labels, all of which incorporate a UCL material.

The invention provides a prussian blue nano particle with high photo-thermal performance and of a manganese-doped hollow structure and a preparation method of the prussian blue nano particle, belongs to the field of nanometer material preparation and biomedicine and aims to solve the problems that existing the photo-thermal performance and biosecurity of an existing manganese-doped prussian blue nano particle are in need of improvement, the synthesis process is complex, and the cost is high. The preparation method includes the steps that surface protectant and potassium ferricyanide are added to an acid solution, manganese salt is added, and a heating reaction is conducted; 2, vacuum drying is conducted after washing is conducted; 3, the acid solution, the surface protectant and a manganese-doped solid prussian blue nano cubic sample are mixed, and the heating reaction is conducted after dispersing is conducted; washing is conducted, a blue porous Mn-HPB nano cubic material is obtained, and vacuum drying is completed. The prussian blue nano particle with high photo-thermal performance and of the manganese-doped hollow structure is simple in preparation process and high in controllability, the obtained nano material is uniform in particle diameter and good in dispersing property, and long-term and stable existence is achieved; excellent biosecurity is achieved; a higher photo-thermal effect and photo-thermal conversion efficiency are achieved, and the prussian blue nano particle and the preparation method are used for photo-thermal treatment of tumors.

The invention provides a method for preparing luminescent band gap tunable double-light emitting manganese-doping perovskite nano-crystal, and belongs to the technical field of material preparation. The method comprises: firstly mixing cesium carbonate, oleic acid, and octadecene, obtaining a cesium oleate precursor solution; mixing lead bromide, oleylamine, oleic acid and octadecene, obtaining alead bromide precursor solution; mixing lead chloride, manganese chloride, and octadecene, obtaining a first mixed solution; adding oleylamine, oleic acid, and tri-n-octylphosphine to the first mixedsolution, obtaining a second mixed solution; adding the cesium oleate precursor solution to the second mixed solution, to obtain Mn:CsPbCl3 nano-crystal solution; injecting the lead bromide precursorsolution to the Mn:CsPbCl3 nano-crystal solution, and stirring, preparing Mn:CsPbCl3-xBrx nano-crystals, wherein X is greater than 0 but less than 3. By adopting the method provided by the invention,the luminescent band gap of the manganese-doping perovskite nanocrystals and continuous tuning of the corresponding illuminating color are realized through anion exchange.

A lighting apparatus capable of emitting white light includes a semiconductor light source; and a phosphor material radiationally coupled to the light source. The phosphor material includes a color-stable Mn+4 doped phosphor prepared by a process including providing a phosphor of formula I;Ax[MFy]:Mn+4  Iand contacting the phosphor in particulate form with a saturated solution of a composition of formula II in aqueous hydrofluoric acid;Ax[MFy];  IIwhereinA is Li, Na, K, Rb, Cs, NR4 or a combination thereof;M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof;R is H, lower alkyl, or a combination thereof;x is the absolute value of the charge of the [MFy] ion; andy is 5, 6 or 7.In particular embodiments, M is Si, Ge, Sn, Ti, Zr, or a combination thereof.

A process for preparing a color stable Mn4+ doped complex fluoride phosphor of formula I includesAx(M(1−m), Mnm)Fy  (I)contacting a first aqueous HF solution comprising (1−m) parts of a compound of formula HxMFy, and a second aqueous HF solution comprising m*n parts of a compound of formula Ax[MnFy], with a third aqueous HF solution comprising (1−n) parts of the compound of formula Ax[MnFy] and a compound of formula AaX, to yield a precipitate comprising the color stable Mn4+ doped complex fluoride phosphor;whereinA is Li, Na, K, Rb, Cs, NR4 or a combination thereof;M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof;R is H, lower alkyl, or a combination thereof;X is an anion;a is the absolute value of the charge of the X anion;x is the absolute value of the charge of the [MFy] ion;y is 5, 6 or 7;0<m≦0.05;0.1≦n≦1.