Preparation of visible light -initiated nano superlong-persistence luminescent materials

A long afterglow luminescence and visible light technology, applied in the field of materials, can solve the problems of industrial production of ultra-long afterglow nano-rare earth luminescent materials excited by visible light, lack of powder, and large particle size of powder.

Inactive Publication Date: 2006-09-27
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no reports on the industrial production of mature visible light-excited ultra-long afterglow nano-rare earth luminescent materials
[0010] In addition, the methods of producing ultra-long afterglow luminescent materials in the prior art often need to be calcined at a very high temperature (such as about 1300 ° C), and the particle size of the powder is often large (such as generally greater than 20um), so it is impossible to obtain Nano-scale powders, which limit the application of ultra-long afterglow luminescent materials in some occasions such as luminescent inks

Method used

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  • Preparation of visible light -initiated nano superlong-persistence luminescent materials
  • Preparation of visible light -initiated nano superlong-persistence luminescent materials
  • Preparation of visible light -initiated nano superlong-persistence luminescent materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Ultra-long afterglow luminescent material (sample 1)

[0059] Take strontium nitrate (0.025mol), aluminum nitrate (0.0925mol), europium nitrate (0.000385mol), dysprosium nitrate (0.00077mol), and dissolve them in 200 ml of 6mol / L HNO 3 , stir to make it fully mixed to form a mixture solution.

[0060] Ammonium carbonate (0.2 mol) precipitant was added and allowed to stand for 30 minutes, resulting in precipitation.

[0061] The resulting precipitate was placed in a reducing atmosphere (such as 3% H 2 -97%N 2 ) to 800° C., and then kept at this temperature for 3.5 hours to obtain the ultra-long afterglow luminescent material (sample 1) of the present invention.

Embodiment 2-4

[0063] Ultra-long afterglow luminescent material (sample 2-4)

[0064] According to the similar method described in Example 1, the difference lies in the use of each combination content and preparation conditions shown in Table 1, as a result, the ultra-long afterglow luminescent material of the present invention (sample 2-4) was obtained.

[0065] Example 1

Embodiment 5

[0067] performance measurement

[0068] In this example, the dimensions and properties of samples 1-4 prepared in Example 1 were tested.

[0069] (a) Average particle size and composition

[0070] The average particle size was determined by TEM electron microscope. Determination of its composition by XRD powder diffraction method

[0071] TEM results as figure 1 shown. The results showed that the particle diameters of the samples all reached the nanometer level, and the average particle diameter was 30-60nm. (Note: figure 1 Shown is a particle diameter photograph of sample 1).

[0072] XRD powder diffraction shows as figure 2 shown. The results show that its composition is Sr 4 al 14 o 25 :Eu 2+ , Dy 3+ , wherein Sr: 2Al: Eu: Dy is calculated from the amount of each raw material in Table 1.

[0073] (b) Afterglow performance

[0074] Measure the luminous performance of sample 1-4 with routine Cary Eclipse method, the afterglow intensity (mcd / m2) of each sample ...

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Abstract

The invention relates to a nano long persistence rare earth luminescent material having the structure represented by formula of aSrO bAl2O3: nEu2+, mDy3+ (I), wherein a, b, n, m are relative mole numbers of each substance, and a=3.5-4.5, b=6.5-7.5, n=0.05-1.5, m=0.05-3.0. The invention also discloses the process for preparing the material and its usage.

Description

technical field [0001] The invention belongs to the field of materials, and more specifically relates to a nanometer ultra-long afterglow rare earth luminescent material and a preparation method thereof. Background technique [0002] The nano-long afterglow rare earth luminescent material excited by visible light can absorb sunlight, lighting, etc., and can store energy to emit light for a long time in the dark. It has the characteristics of energy storage and energy saving, environmental friendliness, and high brightness. Therefore, it has become the focus and hot spot of research and development in the field of optics. Scientists from various countries have been developing luminescent materials that can be excited by visible light, have longer afterglow time, stronger afterglow intensity, and slower afterglow decay. [0003] Since the discovery of the long afterglow phenomenon in the early 20th century, the development of long afterglow materials has made great progress. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 彭子飞周亚丽
Owner SHANGHAI NORMAL UNIVERSITY
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