47results about How to "Improve up-conversion luminous efficiency" patented technology

The invention discloses a laminated glass material capable of realizing simultaneous emission of blue, green and red colors without reducing the intensity of blue-green light up-converted by rare earth ions. The glass material is composed of two or more glass materials doped with two different ions, one of which is doped with Yb 3+ / Er 3+ , another glass material doped with Yb 3+ / Tm 3+ . Compared with adding multiple kinds of rare earth luminescent ions to the same matrix material, the invention avoids fluorescence quenching between rare earth ions and improves up-conversion luminous efficiency. Especially in the three-dimensional display, the graphics formed by the light emitted at different thicknesses of the glass have a more three-dimensional display effect, and the present invention has a remarkable application prospect.

The invention relates to a method for preparing a flat hexagonal prism rare-earth doped up-conversion material. The method comprises the following steps: (1) putting a rare-earth oxide into a dilutedhydrochloric acid solution, stirring until complete dissolution, removing excessive hydrochloric acid, and cooling so as to obtain a rare-earth chloride storage liquid for later use; (2) putting a surfactant and a morphology control agent into the rare-earth chloride storage liquid prepared in the step (1), and sufficiently stirring; (3) dropping a sodium fluoride solution, and performing a stirring reaction so as to obtain a rare-earth precursor; (4) finally, putting the rare-earth precursor prepared in the step (3) into a reaction kettle, performing a hydrothermal reaction, separating reaction products, cleaning, and drying, so as to obtain a target product. Compared with the prior art, the method has a function that a flat hexagonal prism beta-NaYF4:Er3+ / Yb3+ material which is smooth insurface and uniform in morphology is prepared through hydro-thermal synthesis for a first time, and the product is complete in morphology, stable in property, uniform in size, large in application value, and the like.

The invention relates to a calcium titanate nanoparticle prepared by adopting a sol-gel method and having up-conversion light-emitting effect. The strong up-conversion light-emitting function can be realized by doping rare earth element erbium, and the light-emitting intensity and light-emitting color can be adjusted according to different doping amount. The nanoparticle with small size and good appearance can be obtained by adding a certain amount of glycerol as an additive into an ethanol solvent. The sol-gel preparation method is simple, the controllability is strong, and the prepared nanoparticle is high in purity and high in yield, and has important application prospects in the field of preparation of light-emitting devices, biotissue imaging and medicine tracing.

The invention discloses a plasmon-enhanced up-conversion luminescent nanoparticle, a preparation method and an application thereof. The plasmon-enhanced upconversion luminescent nanoparticles of the present invention include gold nanosphere groups and Gd wrapped gold nanosphere groups 2 o 3 Nanoparticles; the gold nanosphere group is composed of 38-119 gold nanospheres, and the particle size of the gold nanospheres is 5-15nm; the Gd 2 o 3 Nanoparticles doped with metal ions Yb 3+ and Ln 3+ . by Gd 2 o 3 :Yb 3+ / Ln 3+ The nanoparticles wrap the gold nanosphere group, and under the condition that the gold nanosphere itself has a plasmon resonance wavelength of 538nm, the gold nanosphere group will produce two other resonance peaks in the near-infrared region. The excitation field enhancement effect induced by SPR, the Purcell effect and the quenching effect are mutually synergistic and competitive, which effectively enhances the emission intensity of the upconversion and improves the luminous efficiency of the upconversion.

The invention discloses a fluosilicate based up-conversion luminescence ceramic material and a preparation method thereof; the general chemical formula of the ceramic material is Ca10-10xEr10xYb10ySi3O15F2, wherein x is Er3+ doped chemical metering percent, y is ytterbium ion Yb+3 mixed chemical metering percent, 0.001 is not more than x+y< 0.2. The up-conversion luminescence ceramic material prepared by the method is stable in crystal structure, uniform in grain diameter size, and stable in lighting performance; under the excitation of 976 nanometer infrared laser, a red lighting peak is appeared in the vicinity of 670 nanometer, and the lighting purity is high, and the up-conversion efficiency is high. For the matrix structure is stable and the doped rare earth concentration is high, the ceramic material is good for enhancing the lighting efficiency and realizing the excitation under a high power. In preparation, the compounds containing elements required by compounding lighting materials are mixed at ratio, the ceramic material is prepared by a high-temperature solid phase method; the preparation method is simple in technique, rich in raw material source, and low in price; moreover, the technique process is free from waste water and waste gas, and is toxic-free and environment-friendly; the fluosilicate based up-conversion luminescence ceramic material is further popularized and used.

The invention relates to a titanium-aluminate-based up-conversion luminescent material, a preparation method and an application, and belongs to the technical field of inorganic luminescent materials. The chemical formula is: Ba 4(1‑x‑y) Er x Yb y Ti 10 Al 2 o 27 , where x is Er 3+ The stoichiometric fraction of doping, y is the ytterbium ion Yb 3+ The stoichiometric fraction of doping, 0.001≤x+y≤0.2, can be prepared by simple high-temperature solid-phase method and sol-gel method. Under the excitation of 976nm infrared laser, the present invention has yellow-green luminous peaks near the wavelengths of 550nm and 660nm, the matrix structure is stable, and the concentration of doped rare earth is high, which is beneficial to enhance the luminous efficiency and realize the excitation under high power, and the up-conversion efficiency High; the prepared up-conversion luminescent material has a uniform particle size, is innovative and has good repeatability, and can be widely used in infrared radiation detection, optical fiber communication technology, fiber amplifier, three-dimensional display, biomolecular fluorescent labeling and other fields. The preparation method of the invention is simple, the cost is low, the raw material supply is unlimited, and the operation and industrial production are easy.

The invention discloses a green titanium niobate up-conversion luminescent material, and a preparation method and application thereof. The green titanium niobate up-conversion luminescent material has a general chemical formula of Ca<5-5x>Er<5x>Yb<5y>Nb<4>Ti<3>O<21>, wherein x is the doping mol ratio of Er<3+> ions, y is the doping mol ratio of Yb<3+> ions, and the sum of x and y is no less than 0.001 and no more than 0.20. The green titanium niobate up-conversion luminescent material prepared in the invention has uniform particles, and under the excitation of light with a wavelength of 976 nm, the material emits green light with a wavelength of about 550 nm and has high luminescent intensity and high up-conversion luminescent efficiency. The green titanium niobate up-conversion luminescent material has good stability, no toxicity and no pollution and can be widely applied to fields like infrared radiation detection, optical fiber communication technology, fiber amplifiers, three-dimensional stereo display and biomolecular fluorescent marking. The preparation method is simple, safe, low in production cost, not restricted by raw material supply and easy for operation and industrial production.