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Highly-doped broadband excited rare earth up-conversion fluorescent nanomaterial and preparation method thereof

A fluorescent nanomaterial and rare earth up-conversion technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of small doping amount, low luminous efficiency, narrow absorption interface, etc., and achieve uniform distribution, large absorption coefficient, wide The effect of absorption bands

Inactive Publication Date: 2014-05-14
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low doping quantity, narrow absorption interface, and low luminous efficiency of the luminescent center of the up-conversion fluorescent material in the prior art, and provide a high-doped broadband excitation rare earth up-conversion fluorescent nanomaterial and its preparation method

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  • Highly-doped broadband excited rare earth up-conversion fluorescent nanomaterial and preparation method thereof
  • Highly-doped broadband excited rare earth up-conversion fluorescent nanomaterial and preparation method thereof
  • Highly-doped broadband excited rare earth up-conversion fluorescent nanomaterial and preparation method thereof

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preparation example Construction

[0029] The preparation method of the above-mentioned highly doped broadband excited rare earth up-conversion fluorescent nanomaterial includes the following steps:

[0030] (1) Prepared with NaYF 4 Nanoparticles with homogeneous core-shell structure that are matrix, doped rare earth sensitizing ions, and highly doped rare earth luminescent central ions;

[0031] The preparation of nanoparticles with a homogeneous core-shell structure is a well-known technique for those in the art. Specifically, a chloride-oleic acid precursor method or a trifluoroacetate decomposition method can be used to first prepare the precursor of the luminescent core nanoparticle, and after cooling, the luminescent core nanoparticle precursor is prepared. Core Nanoparticle Precursors Added to Inert Shell NaYF 4 In the raw material, the nanoparticle with homogeneous core-shell structure is formed by heating reaction at 300℃-320℃;

[0032] (3) compounding the nanoparticles with a homogeneous core-shell ...

Embodiment 1

[0046] to combine Figure 2-4 Illustrative Example 1

[0047] (1) Luminescent nucleus NaYF 4 :Er 3+ (5%), Yb 3+ (20%) Preparation of precursors:

[0048] In a three-necked flask, 0.1178 g of YCl 3 , 0.0387 g YbCl 3 , 0.0048 g ErCl 3 Dissolve in 3ml of oleic acid and 7ml of octadecene, deoxygenate for 30min under the protection of argon, gradually raise the temperature to 150°C and stir for 30min to obtain a solution, when it cools down to room temperature, add 5ml containing 0.074g of NH 4 F and 0.05 g of NaOH in methanol solution, gradually warming up to 80°C and stirring for 30 minutes, removing methanol, then gradually raising the temperature to 320°C, the heating rate is about 10°C / min, stirring and maintaining the reaction for 90 minutes, forming NaYF 4 :Er 3+ (5%), Yb 3+ (20%) luminescent nucleus, centrifuged, and with acetone, ethanol ultrasonic washing, the product is dispersed in 8ml cyclohexane;

[0049] (2) Preparation of homogeneous core-shell nanoparticl...

Embodiment 2

[0056] (1) Luminescent nucleus NaYF 4 :Ho 3+ (5%), Yb 3+ (20%) Preparation of precursors:

[0057] In a three-necked flask, 0.1178 g of YCl 3 , 0.0387 g YbCl 3 , 0.0048 g HoCl 3 Dissolve in 3ml of oleic acid and 7ml of octadecene, deoxygenate for 30min under the protection of argon, gradually raise the temperature to 150°C and stir for 30min to obtain a solution, when it cools down to room temperature, add 5ml containing 0.074g of NH 4The methanol solution of F and 0.05 g NaOH was gradually heated up to 80 °C and stirred for 30 min. After removing methanol, the temperature was gradually increased to 320 °C. The heating rate was about 10 °C / min. The reaction was stirred and kept for 90 min to form NaYF. 4 :Er 3+ (5%), Yb 3+ (20%) luminescent nucleus, centrifuged, and ultrasonically washed with acetone and ethanol to obtain the product dispersed in 8 ml of cyclohexane;

[0058] (2) Preparation of homogeneous core-shell nanoparticles:

[0059] Put 0.213 g of YCl in a thr...

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Abstract

The invention discloses a highly-doped broadband excited rare earth up-conversion fluorescent nanomaterial and a preparation method thereof, belonging to the technical field of luminescent materials and aiming to solve the problems of small doping amount, narrow absorption interface and low luminescence efficiency of the luminescence center of an up-conversion fluorescent material in the prior art. In the highly-doped broadband excited rare earth up-conversion fluorescent nanomaterial, NaYF4 is taken a substrate, rare earth sensitized ions are doped, and rare earth luminescence center ions are highly doped, so that the nanomaterial is in nano-crystalline micromorphology, and nanoparticles have homogeneous core-shell structures. Organic antenna molecules are compound on the surfaces of the nanoparticles, the broadband adsorption range of the organic antenna molecules is 750-1,100 nanometers, and the coverage range is 980 nanometers. The up-conversion luminescence efficiency of the fluorescent nanomaterial is 1.2 percent, the minimum particle diameter of the nanoparticles can be up to 25 nanometers, and the nanoparticles are uniformly distributed.

Description

technical field [0001] The invention relates to a highly doped broadband excited rare earth up-conversion fluorescent nanometer material and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] Upconversion luminescent materials, especially rare earth doped upconversion luminescent materials, have been used in solar cells and biomedicine in recent years due to their special ability to convert two or more incoherent photons into one high-energy photon. Among solar cells, the most efficient indirect-band monocrystalline silicon-based solar cells have almost no absorption in the near-infrared region, and upconversion nanomaterials surface-modified with organic dye molecules can extend the absorption band from 920nm-1μm to 800nm -1μm or less, that is, the near-infrared part of sunlight that is less absorbed by the solar cell is converted into visible light through the up-conversion material, which is absorbed by t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85C09K11/02
Inventor 刘晓敏孔祥贵张友林涂浪平常钰磊
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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