A kind of yellow fluorescent powder for white light LED suitable for blue light excitation and preparation method thereof

A technology excited by yellow phosphor powder and blue light, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as high color temperature, low color rendering index, and poor thermal characteristics, and achieve the effect of reducing color temperature and improving color rendering index

Active Publication Date: 2016-12-07
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the technical problems of lack of red light components, high color temperature, low color rendering index and poor thermal characteristics in the prior art of using YAG fluorescent powder to prepare white light LEDs, and provides a white light LED suitable for blue light excitation Yellow fluorescent powder and its preparation method

Method used

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  • A kind of yellow fluorescent powder for white light LED suitable for blue light excitation and preparation method thereof
  • A kind of yellow fluorescent powder for white light LED suitable for blue light excitation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Material selection according to chemical formula M 1-x N 2-y+x Al 1-x Si x o 5 :Eu y , where M is La, N is Sr, x=0.10, y=0.02, and high-purity SrCO is weighed according to its mole percentage 3 , Al 2 o 3 , SiO 2 , La 2 o 3 and Eu 2 o 3 , put it into a crucible after fully grinding and reduce the atmosphere H at 1100°C 2 / N 2 (10% / 90%) and sintered for 4 hours, took it out after cooling, and transferred it to a crucible after being ground. 2 / N 2 (10% / 90%) and sintering for 6 hours to obtain the final product.

[0018] figure 1 a is prepared by the present embodiment to obtain europium ion-doped La 1-x Sr 2-y+x Al 1-x Si x o 5 :Eu y (x=0.10, y=0.02) XRD spectrum of the luminescent material; indicating that we have successfully prepared the material.

Embodiment 2

[0020] Material selection according to chemical formula M 1-x N 2-y+x Al 1-x Si x o 5 :Eu y , where M is La, N is Sr, x=0.50, y=0.02, and high-purity SrCO is weighed according to its molar percentage 3 , Al 2 o 3 , SiO 2 , La 2 o 3 and Eu 2 o 3 , put it into a crucible after fully grinding and reduce the atmosphere H at 1200°C 2 / N 2 (10% / 90%) and sintered for 4 hours, took it out after cooling, and transferred it to a crucible after being ground. 2 / N 2 (10% / 90%) and sintering for 6 hours to obtain the final product.

[0021] figure 2 For the La prepared by this example 1-x Sr 2-y+x Al 1-x Si x o 5 :Eu y (x=0.50, y=0.02) Excitation and emission spectra of the luminescent material.

Embodiment 3

[0023] Material selection according to chemical formula M 1-x N 2-y+x Al 1-x Si x o 5 :Eu y , where M is La, N is Sr, x=0.90, y=0.02, and high-purity SrCO is weighed according to its mole percentage 3 , Al 2 o 3 , SiO 2 , La 2 o 3 and Eu 2 o 3 , put it into a crucible after fully grinding and reduce the atmosphere H at 1100°C 2 / N 2 (10% / 90%) and sintered for 4 hours, took it out after cooling, and transferred it to a crucible after grinding, and reduced the atmosphere H at 1600 ° C. 2 / N 2 (10% / 90%) and sintering for 6 hours to obtain the final product.

[0024] figure 1 b is prepared by the present embodiment to obtain europium ion-doped La1-x Sr 2-y+x Al 1-x Si x o 5 :Eu y (x=0.90, y=0.02) XRD spectrum of the luminescent material; it shows that we have successfully prepared the material.

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Abstract

The invention relates to a yellow fluorescent powder for a blue-light-excited white LED and a preparation method of the yellow fluorescent powder, belongs to the field of luminescent materials, and aims at solving the technical problems of shortage of a red-light component, high color temperature, low color rendering index and poor thermal characteristics in an existing white LED preparation method in which YAG fluorescent powder is used. The chemical composition of the yellow fluorescent powder is M1-xN2-y+xAl1-xSixO5:Euy, wherein M is La or Gd; N is Sr or Ba; x=0.10-0.90; and y=0.01-0.07. The invention further provides a preparation method of the material. An emission peak of a sample is broadband transmission of which the main peak is at 569nm under the excitation of blue light at 450nm, is closer to a yellow light zone than YAG, and is combined with a blue LED chip, so that the color temperature of the product can be reduced and the color rendering index is improved; and the product has certain popularization value in preparation of efficient luminescent materials with potential applicability for the white LED.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a yellow fluorescent powder for white LEDs suitable for blue light excitation and a preparation method thereof. Background technique [0002] White light-emitting diode (LED), as a new solid-state lighting technology, due to its high luminous efficiency, long service life, and environmental friendliness, this technology will gradually replace energy-consuming incandescent lamps and mercury-polluted fluorescent lamps, so many Countries and regions have formulated corresponding measures and countermeasures to develop white LEDs. At present, there are three main ways to realize white LEDs. One is to combine red, green and blue LEDs, and the other is to use blue LEDs to combine yellow phosphors (Y 3 Al 5 o 12 , YAG), and the third is to use ultraviolet light LEDs to combine red, green and blue phosphors. However, there is only the second way to truly achieve commercialization...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80
Inventor 林君张洋
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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