LED plant growth warm white fluorescent powder and preparation method thereof

A technology of plant growth and warm white light, which is applied in the field of phosphors, can solve the problems of reducing luminous efficiency and color rendering index, affecting the luminous efficiency of phosphors, reducing the sintering activity of powders, etc., so as to avoid insufficient stability and high temperature reaction hard Agglomeration phenomenon, effect of narrow particle size distribution

Pending Publication Date: 2021-01-05
DONGTAI TIANYUAN FLUORESCENT MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The warm white LED plant growth red phosphors in the prior art generally use alkaline earth metal sulfide phosphors, which produce red phosphors with low wavelength and color temperature under the excitation of blue light or ultraviolet light, because the sulfur element in the system phosphors is easy to precipitate And react with oxygen in the air, resulting in poor chemical stability, there are deliquescence and damage to the crystal structure to reduce the luminous efficiency and color rendering index defects and sulfur po

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing LED plant growth warm white fluorescent powder, wherein the preparation method is as follows:

[0021] S1: according to chemical formula RM x Y y (WO 4 ) 3y / 2 (PO 4 ) (1+2X) / 3 : aEu 3+ , bMn 4+ Among them, R is Li, M is Sr, x=0.4, y=0.35, a=0.4, b=1.2, calculate the ratio of chemical components and weigh the raw material R 2 CO 3 , M 3 (PO 3 ) 2 ,Y 2 (WO 4 ) 3， Eu 2 o 3 , RMnO 4 Grind separately in a mortar;

[0022] S2: put R 2 CO 3 and M 3 (PO 3 ) 2 Mix and dissolve in deionized water to obtain a mixed solution to obtain a mixed solution, Y 2 (WO 4 ) 3 Dissolve in deionized water and slowly add the mixed solution dropwise, continue to add RMnO 4 And stirring to adjust the pH to produce precipitation after 5;

[0023] S3: Centrifuge to take the precipitate for hydrothermal reaction. During the hydrothermal reaction, put the mixture of n-butanol and water in the hydrothermal reaction kettle, add the centrifuged precipita...

Embodiment 2

[0027] A method for preparing LED plant growth warm white fluorescent powder, wherein the preparation method is as follows:

[0028] S1: according to chemical formula RM x Y y (WO 4 ) 3y / 2 (PO 4 ) (1+2X) / 3 : aEu3+ , bMn 4+ Wherein, R is Rb, M is Mg, x=0.25, y=0.4, a=0.8, b=0.8, calculate the ratio of chemical components and weigh the raw material R 2 CO 3 , M 3 (PO 3 ) 2 ,Y 2 (WO 4 ) 3， Eu 2 o 3 , RMnO 4 Grind separately in a mortar;

[0029] S2: put R 2 CO 3 and M 3 (PO 3 ) 2 Mix and dissolve in deionized water to obtain a mixed solution to obtain a mixed solution, Y 2 (WO 4 ) 3 Dissolve in deionized water and slowly add the mixed solution dropwise, continue to add RMnO 4 And stirring to adjust the pH to produce precipitation after being 4;

[0030] S3: Centrifuge to take the precipitate for hydrothermal reaction. During the hydrothermal reaction, put the mixture of n-butanol and water in the hydrothermal reaction kettle, add the centrifuged precipit...

Embodiment 3

[0034] A method for preparing LED plant growth warm white fluorescent powder, wherein the preparation method is as follows:

[0035] S1: according to chemical formula RM x Y y (WO 4 ) 3y / 2 (PO 4 ) (1+2X) / 3 : aEu 3+ , bMn 4+ Among them, R is In, M is Ba, x=0.1, y=0.52, a=0.7, b=0.6, calculate the ratio of chemical components and weigh the raw material R 2 CO 3 , M 3 (PO 3 ) 2 ,Y 2 (WO 4 ) 3， Eu 2 o 3 , RMnO 4 Grind separately in a mortar;

[0036] S2: put R 2 CO 3 and M 3 (PO 3 ) 2 Mix and dissolve in deionized water to obtain a mixed solution to obtain a mixed solution, Y 2 (WO 4 ) 3 Dissolve in deionized water and slowly add the mixed solution dropwise, continue to add RMnO 4 And stirring to adjust the pH to 5.5 to produce precipitation;

[0037] S3: Centrifuge to take the precipitate for hydrothermal reaction. During the hydrothermal reaction, put the mixture of n-butanol and water in the hydrothermal reaction kettle, add the centrifuged precipitat...

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Abstract

The invention discloses a LED plant growth warm white fluorescent powder and a preparation method thereof. The chemical formula of the fluorescent powder is RM<x>Y<y> (WO<4>)<3y/2> (PO<4>)< (1 + 2X)/3>: aEu<3+>, bMn<4+>, wherein R is one of Li, Rb, Cs or In, M is one of Ca, Sr, Ba or Mg, 0.1 < = x < = 0.75, 0.2 < = y < = 0.55, and 0.1 < = a < 0.8, 0.3<=b<2. The method comprises steps: grinding ina mortar, mixing R2CO3 and M3(PO3)2, dropwise adding a mixed solution of R2CO3 and M3(PO3)2, adding RMnO4, stirring, taking an obtained precipitate for hydrothermal reaction, and mixing with Eu2O3 toobtain a precursor powder; carrying out high-temperature firing in a reducing atmosphere, adopting an alkaline-earth metal and Y co-doped mixed tungsten phosphate system as a matrix material, codopingEu < 3 + > and Mn < 4 + > to serve as activated light-emitting particles, transferring excitation energy from R3 to sensitized Mn < 4 + >, carrying out gradient temperature control firing treatment after a precursor is prepared through a hydrothermal synthesis method, so that activity and light-emitting efficiency are improved, and concentration quenching effect is overcome. The problems of insufficient stability and deliquescence pollution are avoided, and the requirements of red fluorescent powder for growth of warm white LED plants are met.

Description

technical field [0001] The invention relates to an LED plant growth warm white fluorescent powder and a preparation method thereof, belonging to the technical field of fluorescent powder. Background technique [0002] LED plant growth light source has the functions of strengthening roots, promoting growth, regulating flowering period and flower color, promoting fruit ripening and coloring, improving taste and quality, and is more environmentally friendly and produced and used, so that phosphors for warm white LEDs have received widespread attention. Warm white light has higher lighting efficiency and less power consumption than cool white light. Warm white light needs to be able to produce red light well under the action of external energy and match it with blue LED chips. Therefore, the preparation of luminescent particles and luminescent substrates suitable for stable high-color rendering red phosphors can greatly improve the color purity and color purity of warm white lig...

Claims

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Application Information

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IPC IPC(8): C09K11/81A01G7/04
CPCC09K11/7796C09K11/7795A01G7/045Y02P60/14Y02B20/00
Inventor 王晶徐达尹向南
Owner DONGTAI TIANYUAN FLUORESCENT MATERIALS CO LTD
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