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Yellow phosphor powder and preparation method thereof

A technology of yellow phosphor powder and flux, applied in the field of yellow phosphor powder and its preparation, can solve the problems of aging luminous intensity, luminous efficiency and color purity decline and decrease, etc.

Inactive Publication Date: 2013-06-12
西安创联电气科技(集团)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The molecular formula used by LED is Y 3 Al 5 o 12 : Ce 3+ The yellow phosphor (YAG) has technical problems such as aging and luminous intensity reduction during use, resulting in a decrease in luminous efficiency and color purity

Method used

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  • Yellow phosphor powder and preparation method thereof
  • Yellow phosphor powder and preparation method thereof
  • Yellow phosphor powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] To prepare with general formula Y 3-x-y-z Gd z Sb y Al 5 o 12 : Ce x The yellow fluorescent powder 10g shown is an example, where x is the number of moles of cerium atoms, y is the number of moles of antimony atoms, x is 0.05, y is 0.02, and z is 1.0. The raw materials used and their preparation methods are as follows:

[0029] 1. Raw material pretreatment

[0030] Pre-fire yttrium oxide, antimony oxide, gadolinium oxide and cerium oxide in a high-temperature furnace at 800°C for 2 hours to remove moisture and impurities.

[0031] 2. Ingredients

[0032] According to formula Y 1.93 Gd 1.0 Sb 0.02 Al 5 o 12 : Ce 0.05 Weigh 3.2759g yttrium oxide, 0.0438g antimony oxide, 5.8634g aluminum hydroxide, 0.1294g cerium oxide, 2.7248g gadolinium oxide, and then weigh 0.5g boric acid as a flux, grind in a mortar for 20 minutes, and prepare the raw material mixture.

[0033] 3. Sintering

[0034] The raw material mixture was put into a corundum crucible, placed in a ...

Embodiment 2

[0040] To prepare with general formula Y 3-x-y-z Gd z Sb y Al 5 o 12 : Ce x The yellow fluorescent powder 10g shown is an example, where x is the number of moles of cerium atoms, y is the number of moles of antimony atoms, z is the number of moles of gadolinium atoms, x is 0.05, y is 0.02, and z is 1.0. The raw materials used Its preparation method is as follows:

[0041] In batching step 2, according to the general formula Y 1.93 Gd 1.0 Sb 0.02 Al 5 o 12 : Ce 0.05 Weigh yttrium oxide, gadolinium oxide, antimony oxide, aluminum hydroxide, and cerium oxide in the same amount as in Example 1, and the flux is 0.1 g of boric acid. Other steps in this step are the same as in Example 1 to prepare a raw material mixture. Other steps are the same as in Example 1 to prepare yellow fluorescent powder.

Embodiment 3

[0043] To prepare with general formula Y 3-x-y-z Gd z Sb y Al 5 o 12 : Ce x The yellow fluorescent powder 10g shown is an example, where x is the number of moles of cerium atoms, y is the number of moles of antimony atoms, z is the number of moles of gadolinium atoms, x is 0.05, y is 0.02, and z is 1.0. The raw materials used Its preparation method is as follows:

[0044] In batching step 2, according to the general formula Y 1.93 Gd 1.0 Sb 0.02 Al 5 o 12 : Ce 0.05Weigh yttrium oxide, gadolinium oxide, antimony oxide, aluminum hydroxide, and cerium oxide in the same amount as in Example 1, and the flux is 0.7 g of boric acid. Other steps in this step are the same as in Example 1 to prepare a raw material mixture. Other steps are the same as in Example 1 to prepare yellow fluorescent powder.

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Abstract

The invention relates yellow phosphor powder prepared from materials shown in a general formula: Y3-x-y-zGdzSbyAl5O12:Cex, wherein x is the mole number of Ce atoms and is not less than 0.005 and not more than 0.15, y is the mole number of Sb atoms and is not less than 0.01 and not more than 0.15, and z is the mole number of Gd atoms and is not less than 0 and not more than 2.4. The preparation method comprises the following steps of: pretreating raw materials; proportioning; sintering; washing; and preparing the yellow phosphor powder. The excitation spectrum of the yellow phosphor powder prepared by the invention is a broadband spectrum of 250-500 nm and has the central wavelengths of 340 nm and 460 nm. Under the excitation of ultraviolet light of 340 nm and 460 nm, the emission spectrumof the yellow phosphor powder comprises band spectrum lines of 470-700 nm and has the central wavelength of 530-560 nm as well as the particle sizes of 2-4 mu m in accordance with a spectrum of conventional yellow phosphor powder. The yellow phosphor powder of the invention has the advantages of high luminous intensity, good stability and high color purity and can be used in the technical field of light-emitting devices.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to yellow fluorescent powder and a preparation method thereof. Background technique [0002] At present, rare earth luminescent materials have become supporting materials in the fields of information display, lighting sources, optoelectronic devices, etc. The high luminous intensity and good microscopic morphology of phosphors can effectively improve the performance of devices. Therefore, the research and development of new fluorescent materials and Applications have always been one of the important research areas in materials chemistry and materials physics. The advancement of modern science and technology has continuously put forward new requirements for luminescent materials. In recent years, light-emitting diodes (LEDs) have the advantages of power saving, small size, low-voltage or low-current start-up, long life, shock resistance, recyclability, pollution-free, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80
Inventor 贺立龙胡娟王飞武巧莉张翼韩领社吕俊峰焦桓马强
Owner 西安创联电气科技(集团)有限责任公司
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