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Inorganic fluorescent material excited by blue LED and preparation method thereof

An inorganic fluorescence and blue light technology, applied in the field of fluorescent materials, can solve the problems of poisoned chips and electrodes, unstable performance, complicated preparation, etc., and achieve the effects of no three waste pollution, uniform and fine particle size, and simple preparation process

Inactive Publication Date: 2011-07-20
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other materials can only be excited by blue light below ≤450nm, and the efficiency is not high
[0003] Because the inorganic fluorescent materials in the prior art have the disadvantages of few varieties, unstable performance, poisoned chips and electrodes by escaping substances, complicated preparation, and high price, a safe, non-toxic, stable chemical property, easy long-term storage, and fluorescent fluorescent material have been invented. An inorganic fluorescent material with stable performance; and a preparation method with low cost, simple process, energy saving, environmental protection and easy industrial production are very necessary

Method used

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  • Inorganic fluorescent material excited by blue LED and preparation method thereof
  • Inorganic fluorescent material excited by blue LED and preparation method thereof
  • Inorganic fluorescent material excited by blue LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of the inorganic fluorescent material provided in this embodiment, the steps are as follows:

[0037] A weighed 2.97mmol, 0.6706g Y 2 o 3 , 12mmol, 2.1186g (NH 4 ) 2 MoO 4 and 3mmol, 0.2216g Li 2 CO 3 , 0.01mmol, 0.0102g Pr 6 o 11 , the doping ratio is 99:1.

[0038] B Mix the precursors, add 50% absolute ethanol liquid of the total mass of the sample, grind and mix.

[0039] C Dry the above product at 80°C in an air blast oven.

[0040] D Place the above precursors in a muffle furnace, increase the temperature programmatically at 500°C, 700°C, and 950°C, sinter for 2 hours, and then grind slightly to obtain the target product.

[0041] figure 1 It is the fluorescence spectrum diagram of the inorganic fluorescent material prepared in Example 1; it can be seen from the diagram that the excitation wavelength: 451nm; the emission wavelength: 606nm.

Embodiment 2

[0043] The preparation method of the inorganic fluorescent material of this embodiment, the steps are as follows:

[0044] A weighed 1.485mmol, 0.3353g Y 2 o 3 , 1.485mmol, 0.483.8g La 2 o 3 , 12mmol, 2.1186g (NH 4 ) 2 MoO 4 and 3mmol, 0.2216g Li 2 CO 3 , 0.01mmol, 0.0102g Pr 6 o 11 , the doping ratio is 99:1.

[0045] B Mix the precursors, add 50% absolute ethanol liquid of the total mass of the sample, grind and mix.

[0046] C Dry the above product at 80°C in an air blast oven.

[0047] D Place the above precursors in a muffle furnace, increase the temperature programmatically at 500°C, 700°C, and 950°C, sinter for 2 hours, and then grind slightly to obtain the target product.

[0048] figure 2 The fluorescence spectrogram of the inorganic fluorescent material prepared for the present embodiment; By figure 2 Visible excitation wavelength: 453nm; emission wavelength: 605nm, 647nm.

Embodiment 3

[0050] The preparation method of the inorganic fluorescent material provided in this embodiment, the steps are as follows:

[0051] A weighed 2.81mmol, 0.6367g Y 2 o 3 , 0.16mmol, 0.0488g La 2 o 3 , 12mmol, 2.1186g (NH 4 ) 2 MoO 4 and 3mmol, 0.2216g Li 2 CO 3 , 0.01mmol, 0.0102g Pr 6 o 11 , the doping ratio is 99:1.

[0052] B Mix the precursors, add 50% absolute ethanol liquid of the total mass of the sample, grind and mix.

[0053] C Dry the above product at 80°C in an air blast oven.

[0054] D Place the above precursors in a muffle furnace, increase the temperature programmatically at 500°C, 700°C, and 950°C, sinter for 2 hours, and then grind slightly to obtain the target product.

[0055] image 3 The fluorescence spectrogram of the inorganic fluorescent material prepared for the present embodiment; By image 3 Visible excitation wavelength: 451nm; emission wavelength: 605nm, 648nm.

[0056] In addition to the above examples, experiments have proved that: ...

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Abstract

The invention belongs to the fluorescent material and provides an inorganic fluorescent material excited by the blue LED and a preparation method thereof. The existing fluorescent material has fewer varieties, unstable performance, complicated preparation process and high price. In the preparation method, yttrium lithium molybdate and lanthanum lithium molybdate are used as base materials and oneor more of silver, praseodymium and lanthanum are doped. The chemical expression of the inorganic fluorescent material is Li1-xY1-n-y (MoO4)2:nPr,xAg,yLa (0.005<=n<=0.05, 0.05<=x<=0.10, 0.05<=y<=0.50). The preparation method comprises the following steps: weighting stoichiometric yttrium salt, lanthanum salt, silver salt, salt of alkaline metal, neutral salt and molybdate to place in a mortar; adding absolute alcohol, grinding at the room temperature, collecting the mixture in a crucible; placing the crucible in a muffle furnace to heat and sinter for 4-8h, and grinding. The invention has thefollowing advantages: the material has uniform particle size, stable performance, low cost, simple preparation method and no pollution in the preparation process.

Description

technical field [0001] The invention belongs to fluorescent materials, in particular to an inorganic fluorescent material excited by a blue LED and a preparation method thereof. Background technique [0002] In 1993, people achieved a breakthrough in blue GaN-LED technology, and then white LEDs were introduced to the market. Compared with traditional lighting sources, white LEDs have many advantages such as small size, low energy consumption, fast response, long life, and no pollution. Advantages, quickly widely used, known as the fourth generation of lighting sources. However, since the absorption peak of the light conversion material of blue LED is required to be located at 420-470nm, there are very few fluorescent materials that can meet this requirement; and due to the low absorption intensity, it is quite difficult to find such fluorescent materials. In the prior art, there are few inorganic fluorescent materials that can be excited by blue light; only rare earth garne...

Claims

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Application Information

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IPC IPC(8): C09K11/78
Inventor 余锡宾许博刘洁宋超
Owner SHANGHAI NORMAL UNIVERSITY
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