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 preparations, can solve problems such as poor stability, high cost, and easy deliquescence, and achieve good stability, no need for coating treatment, and not easy to deliquescence.

Inactive Publication Date: 2013-05-01
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 , according to 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 anhydrous ethanol after weighing the raw materials, grind in a mortar and mix thoroughly to obtain powder A 1 , A 2 , A 3 , A 4 and A 5 . Powder A 1 , A 2 , A 3 , A 4 and A 5 They were placed in alumina crucibles for pre-sintering, the pre-sintering temperature was 850°C, the heating rate was 3°C / min, and the pre-sintering powder B was obtained after holding for 2 hours and naturally cooling. 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 formula Ca 0.9975 Sm 0.0025 Bi 2 Ta 2 O 9The selected raw materials were weighed for the element ratio, and the remaining experimental conditions were the same as those in Example 1.

[0041] The detection shows that the final sample obtained in this example emits red fluorescence after being excited by blue light, and the main excitation peak position of the phosphor powder is 480 nm, and the main emission peak position is 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 formula Ca 0.9975 Eu 0.0025 Bi 2 Ta 2 O 9 The selected raw materials were weighed for the element ratio, and the remaining experimental conditions were the same as those in Example 1.

[0044] The detection shows that the final sample obtained in this example 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, and belongs to the technical field of luminescent materials. Background technique [0002] White 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. After the fourth generation of lighting sources. Since the advent of the first white LED 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 for white LEDs: (1) a combination of red / green / blue three-color LEDs. This method can adjust the color at will, but the...

Claims

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Application Information

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Patent Type & Authority Patents(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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