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Red fluorescent powder capable of being excited by blue light and preparation method thereof

A technology of red phosphor and blue light excitation, which is applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of red phosphor luminous efficiency and unsatisfactory stability, and achieve improved LED lighting efficiency and stable structure , Improve the effect of luminous efficiency

Active Publication Date: 2021-09-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] For this reason, the technical problem to be solved by the present invention is to provide a kind of SrLaScO that can be excited by blue light 4 :Eu 2+ Red phosphor, to solve the problem of unsatisfactory luminous efficiency and stability of red phosphor in the prior art;

Method used

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  • Red fluorescent powder capable of being excited by blue light and preparation method thereof
  • Red fluorescent powder capable of being excited by blue light and preparation method thereof
  • Red fluorescent powder capable of being excited by blue light and preparation method thereof

Examples

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Effect test

Embodiment 1

[0042] Weigh raw material SrCO 3 2.0 mmol, La 2 o 3 1.0mmol, Sc 2 o 3 1.0mmol, Eu 2 o 3 0.02mmol, after the above raw materials are fully mixed, placed in a high-temperature tube furnace, in 10% H 2 -90%N 2 In the atmosphere, keep warm at 500°C for 6h, heat up to 1400°C for sintering for 4h, continue to heat up to 1500°C for 6h, then cool down to room temperature and take it out. The phosphor powder with uneven luminescence on the surface layer was scraped off, and then the phosphor powder on the inner layer was ground into powder to obtain the red phosphor powder of this embodiment.

[0043] The phase diagram of the red fluorescent powder described in this embodiment is as attached figure 1 Shown in (a), the fluorescent powder of the present invention corresponds completely to the standard card; Its excitation and emission spectra are as attached figure 1 As shown in (b), the excitation spectrum of the sample is monitored with a wavelength of 620nm. Obviously, the...

Embodiment 2

[0045] Weigh raw material SrCO 3 2.0 mmol, La 2 o 3 1.0mmol, Sc 2 o 3 1.0mmol, Eu 2 o 3 0.1mmol, after fully mixing the above raw materials, put them in a high-temperature tube furnace, in 10% H 2 -90%N 2 In the atmosphere, keep warm at 500°C for 6h, heat up to 1400°C for sintering for 4h, continue to heat up to 1500°C for 6h, then cool down to room temperature and take it out. The phosphor powder with uneven luminescence on the surface layer was scraped off, and then the phosphor powder on the inner layer was ground into powder to obtain the red phosphor powder of this embodiment.

[0046] The phase diagram of the red fluorescent powder described in this embodiment is as attached figure 2 Shown in (a), the fluorescent powder of the present invention corresponds completely to the standard card, and no heterogeneous diffraction peaks are produced; its excitation and emission spectra are as attached figure 2 As shown in (b), the excitation spectrum of the sample is...

Embodiment 3

[0048] Weigh raw material SrCO 3 2.0 mmol, La 2 o 3 1.0mmol, Sc 2 o 3 1.0mmol, Eu 2 o 3 0.1mmol, and take by weighing the additive (NH 4 ) 2 SO 4 , after fully mixing the raw materials and additives, put them in a high-temperature tube furnace, in 10% H 2 -90%N 2 In the atmosphere, keep warm at 500°C for 6h, heat up to 1400°C for sintering for 4h, continue to heat up to 1500°C for 6h, then cool down to room temperature and take it out. The phosphor powder with uneven luminescence on the surface layer was scraped off, and then the phosphor powder on the inner layer was ground into powder to obtain the red phosphor powder of this embodiment.

[0049] The phase diagram of the red fluorescent powder described in this embodiment is as attached image 3 Shown in (a), the fluorescent powder of the present invention corresponds to a standard card; its excitation and emission spectra are as attached image 3 As shown in (b), the excitation spectrum of the sample is monit...

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Abstract

The invention belongs to the technical field of inorganic luminescent materials, particularly relates to red fluorescent powder capable of being excited by blue light, more particularly relates to Eu2+ doped red fluorescent powder, and further discloses a preparation method and application of the Eu2+ doped red fluorescent powder. According to the red fluorescent powder capable of being excited by the blue light, the oxide SrLaScO4 serves as a fluorescent powder matrix, Eu2+ is doped to achieve red light emission, the S-containing compound is added in the synthesis process to serve as an additive, Eu3+ is effectively promoted to be reduced into Eu2+ to a larger extent, the actual content of Eu2+ in the fluorescent powder is increased, and therefore, the luminous efficiency of the red fluorescent powder is improved, and the red fluorescent powder has a greater potential value for improving the LED illumination efficiency, and has an absolute improvement effect for optimizing the color rendering performance of the white light LED.

Description

technical field [0001] The invention belongs to the technical field of inorganic luminescent materials, and in particular relates to a red fluorescent powder which can be excited by blue light, more specifically to a Eu 2+ Doped with red fluorescent powder, and further discloses its preparation method and application. Background technique [0002] White light-emitting diode (WLED) has received more and more attention in recent years because of its huge application potential in the field of solid-state lighting, and is known as the fourth-generation green lighting source. At present, the light-converting white LEDs that can be industrialized usually use blue-light InGaN chips to pump YAG:Ce 3+ Yellow phosphor is obtained. This kind of white light LED has a simple manufacturing principle and high luminous efficiency, and has been applied in many fields. However, since YAG:Ce 3+ Insufficient red light component in the overall emission of the emission spectrum usually makes ...

Claims

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Application Information

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IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7786H01L33/502Y02B20/00
Inventor 夏志国杨至雨
Owner SOUTH CHINA UNIV OF TECH
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