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Up-conversion light emitting material and preparation method thereof

A luminescent material, yttrium oxide technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problem of low luminous efficiency

Inactive Publication Date: 2013-02-13
UNIV OF SCI & TECH OF CHINA
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent application number 201010598487 discloses a method for preparing ZnO-based up-conversion luminescent materials with a core-shell structure, by immersing ZnO-based up-conversion luminescent nanocrystals in Mo(NO 3 ) 3 The core-shell structure is prepared by chemical modification in the solution, and the shell formed by surface modification is used to reduce the surface state to improve the efficiency of upconversion luminescence, but it is still limited by the oxide matrix, and the luminous efficiency is low

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  • Up-conversion light emitting material and preparation method thereof
  • Up-conversion light emitting material and preparation method thereof

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[0038] The present invention also provides a method for preparing an up-conversion luminescent material, which includes the following steps: A) reacting gold nanoparticles, ammonia water and substituted silane in an alcohol solution to obtain Au@SiO 2 Nanoparticles, the substituted silane is selected from one of tetramethoxysilane and tetraethoxysilane, preferably tetraethoxysilane; B) the Au@SiO 2 Nanoparticles, precipitant, yttrium source, ytterbium source and Re source are heated and reacted, dried and then calcined to obtain an up-conversion luminescent material, and the precipitant is selected from one of ammonium bicarbonate and urea.

[0039] According to the present invention, the gold nanoparticles can be commercially available gold nanoparticles or self-made gold nanoparticles, and there is no special limitation, as long as the preparation method is well-known to those skilled in the art. In the present invention, the sodium citrate reduction method is preferably use...

Embodiment 1

[0050] 1.1 Quickly add 1.3mL of 38.8mM sodium citrate solution to boiling 100mL of 0.3mM chloroauric acid solution, and reflux for 15min to obtain a gold sol solution. The average diameter of gold nanoparticles is 30nm.

[0051] 1.2 Mix 90 mL of the gold sol solution obtained in 1.1 with 360 mL of isopropanol evenly, add 18 mL of ammonia water and 180 μL of tetraethoxysilane under rapid stirring conditions, react for 8 hours, centrifuge, and wash with ethanol and water three times respectively , to a pH value of 7, and dried for 12 hours to obtain Au@SiO with a silicon dioxide layer of 40nm 2 nanoparticles.

[0052] 1.3 The Au@SiO obtained in 1.2 2 Mix nanoparticles, 100mL deionized water and 2.7g urea evenly, add 0.78mL 0.1mM yttrium nitrate, 0.20mL 0.1mM ytterbium nitrate and 0.02mL 0.1mM erbium nitrate, react at 80°C for 5h, centrifuge, water and Washed with ethanol three times, dried at 80°C for 12h, and then calcined in a muffle furnace at 800°C for 3h to obtain an up-c...

Embodiment 2

[0060] 2.1 Quickly add 1.3mL of 38.8mM sodium citrate solution to boiling 100mL of 0.3mM chloroauric acid solution, and reflux for 15min to obtain a gold sol solution. The average diameter of gold nanoparticles is 30nm.

[0061] 2.2 Mix 90 mL of the gold sol solution obtained in 2.1 with 360 mL of isopropanol evenly, add 18 mL of ammonia water and 45 μL of tetraethoxysilane under rapid stirring conditions, react for 8 hours, centrifuge, and wash with ethanol and water three times respectively , to a pH value of 7, and dried for 12 hours to obtain Au@SiO with a silicon dioxide layer of 25nm 2 nanoparticles.

[0062] 2.3 The Au@SiO obtained in 2.2 2 Mix nanoparticles, 100mL deionized water and 2.7g urea evenly, add 0.78mL 0.1mM yttrium nitrate, 0.20mL 0.1mM ytterbium nitrate and 0.02mL 0.1mM erbium nitrate, react at 80°C for 5h, centrifuge, water and Washed with ethanol three times, dried at 80°C for 12h, and then calcined in a muffle furnace at 800°C for 3h to obtain an up-co...

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Abstract

The invention provides an up-conversion light emitting material and a preparation method thereof, wherein the up-conversion light emitting material is composed of a kernel, an intermediate layer and a shell; the kernel is a gold nano-particle layer; the intermediate layer is a silicon dioxide layer; and the shell is an Yb<3+> and Re<3+> doped yttrium oxide layer. Compared with the up-conversion light emitting material with a kernel structure in the prior art, the up-conversion light emitting material disclosed by the invention is characterized in that a nano-gold kernel is used as a plasma element; the double-doped yttrium oxide layer is used as the up-conversion light emitting layer; firstly, the up-conversion light emitting efficiency is increased by utilizing the surface enhancement effect of gold nano-particles; secondly, a yttrium oxide substrate has better transmissivity at visible light and infrared bands; the phonon energy is lower and is 430-550 cm<-1>; high-concentration doping can be carried out; and the up-conversion light emitting efficiency is also favorably increased; finally, chemical property of yttrium oxide is steady; and the up-conversion light emitting material is simpler for preparation and lower in cost.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to an up-conversion luminescent material and a preparation method thereof. Background technique [0002] Rare earth ion-doped up-conversion luminescent materials use the metastable state energy level characteristics of rare earth elements, which can absorb multiple low-energy long-wave radiations, so that infrared light invisible to the human eye can be transformed into visible light. [0003] The up-conversion material can effectively reduce the degradation of the matrix material caused by photoionization, does not require strict phase matching, does not require high stability of the excitation wavelength, and has a certain tunability of the output wavelength. The small size effect, surface effect, quantum size effect, etc. make it show characteristics that conventional materials do not have in terms of light, magnetism, and electricity, and can observe so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79
Inventor 陆亚林刘敏葛文雷志威王建林
Owner UNIV OF SCI & TECH OF CHINA
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