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Blue-excited red fluorescent material and preparation method thereof

A technology excited by red fluorescence and blue light, which is applied in the field of red fluorescent materials and preparation, can solve the problems of easy deliquescence, high cost, poor stability, etc., and achieve the effect of not easy deliquescence, no need for coating treatment, and good stability

Inactive Publication Date: 2011-02-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, there are three main preparation technologies for white LEDs: (1) The combination of red / green / blue LEDs. This method can adjust the color at will, but the power supply is complicated and the cost is high.
(2) The combination of ultraviolet LED and multi-color phosphor, this method has the best color rendering, but the current efficiency is low
However, this kind of phosphor has poor stability and is easy to deliquesce, so it must be coated

Method used

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  • Blue-excited red fluorescent material and preparation method thereof
  • Blue-excited red fluorescent material and preparation method thereof
  • Blue-excited red fluorescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] to prepare Ca 0.9975 PR 0.0025 Bi 2 Ta 2 o 9 , Ca 0.995 PR 0.005 Bi 2 Ta 2 o 9 , Ca 0.99 PR 0.01 Bi 2 Ta 2 o 9 , Ca 0.98 PR 0.02 Bi 2 Ta 2 o 9 and Ca 0.96 PR 0.04 Bi 2 Ta 2 o 9 For example, the raw material is CaCO 3 、Pr 6 o 11 、 Bi 2 o 3 and Ta 2 o 5 , by formula Ca 0.9975 PR 0.0025 Bi 2 Ta 2 o 9 , Ca 0.995 PR 0.005 Bi 2 Ta 2 o 9 , Ca 0.99 PR 0.01 Bi 2 Ta 2 o 9 , Ca 0.98 PR 0.02 Bi 2 Ta 2 o 9 and Ca 0.96 PR 0.04 Bi 2 Ta 2 o 9 Element ratio Weigh the selected raw materials, add absolute ethanol after weighing the raw materials, grind in a mortar and mix well to get powder A 1 、A 2 、A 3 、A 4 and A 5 . Powder A 1 、A 2 、A 3 、A 4 and A 5 Place them in alumina crucibles for pre-firing respectively, the pre-firing temperature is 850°C, the heating rate is 3°C / min, keep warm for 2 hours and cool naturally to get pre-fired powder B 1 , B 2 , B 3 , B 4 and B 5 . Pre-fired powder B 1 , B 2 , B 3 , B 4 and B...

Embodiment 2

[0040] to prepare Ca 0.9975 SM 0.0025 Bi 2 Ta 2 o 9 For example, the raw material is CaCO 3 、Sm 2 o 3 、 Bi 2 o 3 and Ta 2 o 5 According to the formula Ca 0.9975 SM 0.0025 Bi 2 Ta 2 o 9The selected raw materials were weighed for element proportioning, and the rest of the experimental conditions were consistent with those in Example 1.

[0041] It can be seen from the test that the final sample obtained in this embodiment emits red fluorescence after being excited by blue light, the main excitation peak of the phosphor powder is at 480 nm, and the main emission peak is at 602 nm.

Embodiment 3

[0043] to prepare Ca 0.995 SM 0.0025 Eu 0.0025 Bi 2 Ta 2 o 9 For example, the raw material is CaCO 3 、Eu 2 o 3 、Sm 2 o 3 、 Bi 2 o 3 and Ta 2 o 5 According to the formula Ca 0.9975 Eu 0.0025 Bi 2 Ta 2 o 9 The selected raw materials were weighed for element proportioning, and the rest of the experimental conditions were consistent with those in Example 1.

[0044] It can be seen from the test that the final sample obtained in this embodiment emits red fluorescence after being excited by blue light.

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Abstract

The invention relates to a blue-excited red fluorescent material and a preparation method thereof, belonging to the field of luminescent materials. The blue-excited red fluorescent material has the following chemical expression: Ca1+d-x-mAmRxBi2Ta2-nBnO9:fC, wherein the R is selected from one or more rare earth elements of Pr, Sm, Eu and Lu; the A is selected from one or more than one of Sr, Ba, Mg, Zn and Cu; the B is selected from one or two of Nb and V; the S is selected from one or more than one of Li, Na, K, Ti, Ag, B, Al, Ga and In, the x is not less than 0.00001 and is not more than 0.1; the m is not less than 0 and is more than 0.99; the n is not less than 0 and is not more than 1.99; the d is not less than 0 and is not more than 0.1; and the f is not less than 0 and is not more than 0.1. The blue-excited red fluorescent material not only has the properties of piezoelectricity, ferroelectricity and dielectricity, but also has the characteristic of blue-excited red emission, belongs to a photoelectric multifunctional material and can be widely applied to the fields of white light LED (Light Emitting Diode), optoelectronic integration, micro electromechanics, photoelectric sense, and the like.

Description

technical field [0001] The invention relates to a red fluorescent material excited by blue light and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] White light LED has the advantages of low energy consumption, long life, small size, light weight, good directionality, fast response, solidification, no pollution and resistance to various harsh conditions. It is known as the successor to incandescent lamps, fluorescent lamps and high-intensity gas discharge lamps. After the fourth generation of lighting sources. Since the first white LED came out in 1996, it has developed rapidly and its luminous efficiency has been continuously improved. It is expected to replace traditional lighting sources such as incandescent lamps, fluorescent lamps and high-pressure mercury lamps, and become the most promising green lighting source in the 21st century. [0003] So far, there are three main preparation technologies fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
CPCY02B20/181Y02B20/00
Inventor 王旭升彭登峰李艳霞张君成唐棉棉
Owner TONGJI UNIV
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