30results about How to "Wavelength does not change" patented technology

The invention relates to a low temperature preparation method of yttrium aluminum garnet rare earth phosphor powder. The rare earth phosphor powder is formed by material expressed by a general formula Y3-xMxAl5-yGayO12, wherein M is Ce or Tb or Ce and Gd, x is molar number of M and is more than or equal to 0.01 and less than or equal to 0.08, y is molar number of Ga and is more than or equal to 0 and less than or equal to 0.8, and the preparation method thereof comprises pretreatment of raw materials, mixing, sintering and the like. The raw material is easy to be evenly mixed and sintering temperature is low during preparation in the invention. The prepared phosphor powder has high brightness, spherical or near spherical shape, controllable powder particle size, even powder particle surface and good luminous performance through test; and the wavelength of emitting light thereof is not changed so as to greatly improve screen coating effect and luminous performance of devices when being applied to different devices, thus being applicable to field emission displays, projection televisions and LED devices, flying-spot scanning displays and the fields with high requirement on screen coating effect, luminous brightness and luminous efficiency of the phosphor powder.

The invention belongs to the field of luminescence materials, and discloses a metal particle-doped hollow structure orthophosphate luminescence material and a preparation method thereof, wherein the structure general formula of the luminescence material is Ba3-xGd(PO4)3:Dyx@My, M is doped metal nanoparticles and is at least one selected from Ag, Au, Pt, Pd and Cu, @ represents cladding, M is the inner core, and Ba3-xGd(PO4)3:Dyx is the outer shell. According to the metal particle-doped hollow structure orthophosphate luminescence material, the dispersed carbon spheres are adopted as the template, such that the obtained hollow structure having the spherical orthophosphate has the controlled morphology; and due to introduction of the M metal nanoparticles, the luminescence efficiency of the orthophosphate luminescence material can be substantially increased under the same excitation condition, and the wavelength of the emission light is not changed.

The invention discloses alkali-metal-ion-reinforced red light type fluorescent powder formed by adulterating titanate in rare earth and a preparation method. The fluorescent powder is formed by adulterating rare earth ions Eu<3+> and charge compensation ions M<+> to a base material ZnTiO<3>, and the general chemical formula is ZnTiO<3>: xEu<3+>, yM<+>, wherein x is greater than or equal to 0.5% and less than or equal to 2.5%, y is greater than or equal to 1.5% and less than or equal to 8.5%, and M<+> represents alkali metal ions. According to the fluorescent powder, the adverse effect caused by introduction of alkali metal is eliminated by adjusting the heat treatment process, the luminous efficiency of a rare-earth-titanate luminescent material can be greatly improved under the same excitation condition, the wavelength of emitted light is not changed, the rare-earth-titanate luminescent material is good in luminescence property, color purity and luminance of the emitted light after being exited are both improved, and the fluorescent powder can be applied to a white-light-used LED. According to the preparation method of the fluorescent powder, a sol-gel preparation technology is adopted, the method is simple, the cost is low, the heat treatment process is simple and easy to control, and actual production of the material is facilitated.

The invention belongs to the field of luminescent materials, and discloses a fluoride phosphate matrix luminescent material and a preparation method thereof, the chemical general formula of the luminescent material is Na2Gd1-xPO4F2:Tbx<3+>,My; wherein M is at least one of Ag, Au, Pt, Pd and Cu, x is greater than 0 and less than or equal to 0.4, y is molar ratio of Na2Gd1-xPO4F2:Tbx<3+>, and y is greater than 0 and less than or equal to 1*10<-2>. By introduction of M metal nanoparticles, fluorescent powder luminescence can be increased by doping the M metal particles, and luminescence efficiency of the fluoride phosphate matrix luminescent material can be improved greatly in same excitation conditions without change of emitted light wavelength.

The invention belongs to the field of luminescent materials, and discloses a lanthanum oxide sulfide luminescent material and a preparation method thereof, the chemical general formula of the luminescent material is La2-x-nO2S:Tbx <3+>, Dyn <3+> @ Mz; wherein La2-x-nO2S:Tbx <3+>, Dyn <3+> is a shell, @ is coating, M is an inner core; M is at least one of Ag, Au, Pt, Pd and Cu, x is greater than 0 and less than or equal to 0.2, n is greater than 0 and less than or equal to 0.02, z is molar ratio of La2-x-nO2S:Tbx <3+>, Dyn <3+>, and z is greater than 0 and less than or equal to 1* 10<-2>. By introduction of metal nanoparticles, fluorescent powder luminescence can be increased by doping the M metal nanoparticles, and luminescence efficiency of the lanthanum oxide sulfide luminescent material can be improved greatly in same excitation conditions.

The invention belongs to the field of luminescent materials, and discloses a magnesium salt luminescent material and a preparation method thereof, the chemical general formula of the luminescent material is Mg1-xA2O4:Mnx <2+>,My; wherein A is at least one of Al and Ga, M is doping metal nanoparticles and is selected from at least one of Ag, Au, Pt, Pd and Cu, x is greater than 0 and less than or equal to 0.2, y is molar ratio of M to Mg1-xA2O4:Mnx <2+>, and y is greater than 0 and less than or equal to 1*10<-2>. By introduction of M metal nanoparticles, fluorescent powder luminescence can be increased by doping the metal nanoparticles, and luminescence efficiency of the magnesium salt luminescent material, namely magnesium aluminate or magnesium gallate, can be improved greatly in same excitation conditions without change of emitted light wavelength.

The invention belongs to the luminescent material field, and discloses a metal nanoparticles-doped gadolinium acid calcium green light luminescent material and a preparation method thereof. A general chemical formula of the luminescent material is CaGd4-xO7: Tbx, My, wherein, M is at least one of Ag, Au, Pt, Pd and Cu metal nanoparticles, the value range of x is greater than 0 and is less than or equal to 0.3, y is mole ratio of M to CaGd4-xO7: Tbx, and the value range of y is greater than 0 and less than or equal to 1*10<-2>. In the metal nanoparticles-doped gadolinium acid calcium green light luminescent material, by introducing M nanoparticles, luminescence efficiency of the gadolinium acid calcium green light luminescent material can be greatly increased under same excitation condition, wavelength of emitted light is not changed, purity and brightness of the stimulated emitted light are enhanced, and the morphology is controllable.

The invention belongs to the field of luminescent materials, and discloses a strontium aluminate luminescent material with a hollow structure and a preparation method. The chemical general formula of the luminescent material is Sr4-x(Al1-yIny)12O25:Eux,Mz, wherein M is at least one of Ag, Au, Pt, Pd and Cu metal nanoparticles, 0<x<=0.2, 0<y<=0.2 and 0<z<=1*10<-2>. According to the strontium aluminate luminescent material, because of introduction of In and M metal particles, doping of In and doping of metal nanoparticles help to enhance luminescence of fluorescent powder, and enable the luminescent efficiency of the strontium aluminate luminescent material at a same excitation condition to be greatly improved.

The invention belongs to the field of luminescent materials, and discloses a metal-nanoparticle-doped yttrium oxide strontium luminescent material and a preparation method thereof, the chemical general formula of the luminescent material is SrY2-xO4:Lnx <3+> @ My; wherein, SrY2-xO4:Lnx <3+> is a casing, @ is coating, M is an inner core; Ln is at least one of Tm and Dy, M is at least one of Ag, Au, Pt, Pd and Cu, x is greater than 0 and less than or equal to 0.1, y is molar ratio of SrY2-xO4:Lnx <3+>, and y is greater than 0 and less than or equal to 1 * 10<-2>. By introduction of metal nanoparticles, fluorescent powder luminescence can be increased by doping the M metal nanoparticles, and luminescence efficiency of the metal-nanoparticle-doped yttrium oxide strontium luminescent material can be improved greatly in same excitation conditions.

The invention provides a direct type backlight light bar, a backlight module and a display device. The direct type backlight light bar comprises a luminous source, a printed circuit board and an optical lens, the luminous source and the optical lens are arranged on the printed circuit board, the optical lens is arranged on the luminous source in a covering manner, the optical lens comprises a lensbody and a plurality of microstructures, the plurality of microstructures are arranged in the lens body, the size of each microstructure meets Rayleigh scattering conditions, the microstructures areused for scattering light of a blue wave band in incident light emitted by the light emitting source, and the blue wave band is a blue light wave band with the wavelength smaller than 450 nm. The wavelength of the blue light of the incident light is not changed, and the energy of the short-wave blue light in the emergent light is reduced, so that the display device provided with the direct type backlight light bar has an eye protection function, and the color gamut saturation of the display device is not influenced.

The invention belongs to the field of luminescent materials, and discloses a blue luminescent materials and a preparation method thereof. The chemical general formula of the luminescent material is Sr2CeO4:Mx, wherein M is a metal-doped nanoparticle and is at least one of Ag, Au, Pt, Pd and Cu, x is the molar ratio of M to Sr2CeO4, and 0<x<=1*10<-2>. According to the provided blue luminescent material, because of introduction of the M metal nanoparticle, doping of the metal nanoparticle helps to enhance luminescence of fluorescent powder, and enables the luminescent efficiency of the Sr2CeO4 blue luminescent material at a same excitation condition to be greatly improved without changing the wavelength of an emission ray.