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Eu2+-eu3+ co-doped fluoroaluminate matrix phosphor and its synthesis method and application

A technology of a heterofluoroaluminate and a synthesis method, which is applied in the field of phosphor powder, can solve the problems of unfavorable absorption of excitation energy, being easily affected by the environment, and short fluorescence lifetime, and achieves improved luminous efficiency, short reaction time, and low calcination temperature. Effect

Inactive Publication Date: 2017-05-31
GUANGXI TEACHERS EDUCATION UNIV
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  • Description
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Problems solved by technology

[0006] Due to the constraint of f-f transition selection law, Eu 3+ The spectrum is narrow and line-shaped, and the intensity of the spectral line is low, which is not conducive to absorbing excitation energy.
But will Eu 3+ Revert to Eu 2+ Later, due to Eu 2+ The outer electron structure is 4f 6 5d 1 , the 5d orbital is exposed, easily affected by the environment, and 4f can occur 6 5d 1 →4f7 transition, this transition has a broadband emission, high intensity, short fluorescence lifetime, the emission spectrum changes with the change of matrix composition and structure, and the excitation spectrum is located in the near ultraviolet region, which can well solve the problem of Eu 3+ There is a problem with luminescence, so looking for a synthetic method to combine Eu in phosphor 3+ Revert to Eu 2+ is a good way

Method used

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  • Eu2+-eu3+ co-doped fluoroaluminate matrix phosphor and its synthesis method and application
  • Eu2+-eu3+ co-doped fluoroaluminate matrix phosphor and its synthesis method and application
  • Eu2+-eu3+ co-doped fluoroaluminate matrix phosphor and its synthesis method and application

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preparation example Construction

[0042] a kind of Eu 2+ -Eu 3+ A method for synthesizing co-doped fluoroaluminate matrix phosphors, comprising the following steps:

[0043] Step 1. Weigh calcium nitrate and ammonium fluoride. After mixing, add europium nitrate solution and aluminum nitrate solution, then add urea and boric acid, stir and mix, place in ultrasonic vibration for 15 minutes to obtain a transparent solution, that is, the precursor;

[0044] Step 2. Burn the precursor in a box-type high-temperature furnace with a preset temperature of 700-1000°C for 5-15 minutes, take it out, cool it, and grind it to obtain divalent europium and trivalent europium co-doped fluoroaluminate matrix fluorescence pink;

[0045] Wherein, the calcium nitrate, europium nitrate, and aluminum nitrate are synthesized according to a certain amount of Ca 12-xAl 14 o 32 f 2 : The stoichiometric ratio of each element in xEu is weighed, and the ammonium fluoride is synthesized by Ca 12-x Al 14 o 32 f 2 : The amount of xE...

Embodiment 1

[0053] a kind of Eu 2+ -Eu 3+ A method for synthesizing co-doped fluoroaluminate matrix phosphors, comprising the following steps:

[0054] Step 1. Weigh calcium nitrate and ammonium fluoride. After mixing, add europium nitrate solution and aluminum nitrate solution, then add urea and boric acid, stir and mix, place in ultrasonic vibration for 15 minutes to obtain a transparent solution, that is, the precursor;

[0055] Step 2. Burn the precursor in a box-type high-temperature furnace with a preset temperature of 700°C for 5 minutes, take it out, cool it, and grind it to obtain divalent europium and trivalent europium co-doped fluoroaluminate matrix phosphor;

[0056] Wherein, the calcium nitrate, europium nitrate, and aluminum nitrate are synthesized according to a certain amount of Ca 12-x Al 14 o 32 f 2 : The stoichiometric ratio of each element in xEu is weighed, and the ammonium fluoride is synthesized by Ca 12-x Al 14 o 32 f 2 : The amount of xEu is weighed with...

Embodiment 2

[0058] a kind of Eu 2+ -Eu 3+ A method for synthesizing co-doped fluoroaluminate matrix phosphors, comprising the following steps:

[0059] Step 1. Weigh calcium nitrate and ammonium fluoride. After mixing, add europium nitrate solution and aluminum nitrate solution, then add urea and boric acid, stir and mix, place in ultrasonic vibration for 15 minutes to obtain a transparent solution, that is, the precursor;

[0060] Step 2. Burn the precursor in a box-type high-temperature furnace with a preset temperature of 800°C for 10 minutes, take it out, cool it, and grind it to obtain divalent europium and trivalent europium co-doped fluoroaluminate matrix phosphor;

[0061] Wherein, the calcium nitrate, europium nitrate, and aluminum nitrate are synthesized according to a certain amount of Ca 12-x Al 14 o 32 f 2 : The stoichiometric ratio of each element in xEu is weighed, and the ammonium fluoride is synthesized by Ca 12-x Al 14 o 32 f 2 : The amount of xEu is weighed wit...

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Abstract

The invention discloses Eu2+-Eu3+co-doped fluoroaluminate matrix fluorescent powder. The molecular formula of the fluorescent powder is Ca12-xAl14O32F2:xEu, wherein x is larger than 0.2 and smaller than 0.6, and Eu in the molecule structure of the fluorescent powder refers to a mixture where Eu2+ and Eu3+ coexist. The reaction time is short, the sintering temperature is low, the energy consumption is low, and by changing the synthesis condition and the excitation wavelength, the strength ratio of blue light emission to red light emission can be regulated and approximate white light can be obtained.

Description

technical field [0001] The invention relates to the field of fluorescent powder. More specifically, the present invention relates to a Eu 2+ -Eu 3+ Co-doped fluoroaluminate matrix phosphor, its synthesis method and application. Background technique [0002] With global warming and energy crisis becoming more serious, saving energy, reducing emissions, and protecting the environment have become hot topics in today's era. Among them, the search for efficient and energy-saving lighting sources has attracted widespread attention from workers in various industries. LED (Light emitting diode) is the abbreviation of light-emitting diode, which is a new type of light source invented and developed in the late 20th century. LED has low energy consumption (only 1 / 8 of the energy consumption of incandescent lamps), long life (tens of thousands of hours), no pollution (no mercury), rich radiation spectrum, high luminous efficiency, good color reproduction, and fast response speed (wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64
CPCY02B20/00Y02P20/10
Inventor 梁利芳陈彩花彭海龙蒙丽丽张丽霞
Owner GUANGXI TEACHERS EDUCATION UNIV
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