Rare earth fluorescent powder and preparation method thereof

A rare earth phosphor and a manufacturing method technology, applied in chemical instruments and methods, luminescent materials, sustainable buildings and other directions, can solve problems such as insufficient light decay, and achieve the effects of improving light decay, increasing temperature quenching, and reducing synthesis temperature

Active Publication Date: 2010-09-22
JIANGSU BREE OPTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the deficiency in light attenuation has always been one of the important problems faced by researchers.

Method used

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  • Rare earth fluorescent powder and preparation method thereof
  • Rare earth fluorescent powder and preparation method thereof
  • Rare earth fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Firstly, 94.86 g of ammonium bicarbonate was weighed to prepare a 25% aqueous solution, and heated to 45° C. in a water bath. Then weigh Sr(NO 3 ) 2 207.39g, Ba(NO 3 ) 2 4.36g, La(NO 3 ) 3 0.27g, Eu(NO 3 ) 3 0.9g, SiO 2 15g was added to deionized water to prepare a suspension with a concentration of 0.5%. Add the suspension to the ammonium bicarbonate solution, keep it warm for 45 minutes while stirring, then separate the suspension from water and powder, wash the powder cake until neutral, and then use deionized Water redisperses the separated powder cake and prepares a suspension with a mass percentage of 35%. Add 0.022 g of LiF to the suspension, ultrasonically disperse for 3 minutes, and then stir for 20 minutes, then dry the suspension, and disperse the dried powder cake to obtain the reaction precursor of the fluorescent powder. The reaction precursor was placed in a furnace with a reducing atmosphere and heated to 1400°C. After a holding time of 4 hours,...

Embodiment 2

[0052] Firstly, 126 g of ammonium bicarbonate was weighed to prepare a concentration of 8% aqueous solution, and heated to 55° C. in a water bath. Then weigh Sr(NO 3 ) 2 202.1g, Ba(NO 3 ) 2 8.71g, La(NO 3 ) 3 1.08g, Eu(NO 3 ) 3 2.82g, SiO 2 19g was added to deionized water to prepare a suspension with a concentration of 1.15%, and the suspension was added to the ammonium bicarbonate solution, kept stirring for 60 minutes, and then the suspension was separated from water and powder, and the powder cake was washed until neutral, and then deionized Water redisperses the separated powder cake and prepares a suspension with a mass percentage of 45%. Add 0.05 g of NaF to the suspension, ultrasonically disperse for 5 minutes, and then stir for 30 minutes, then dry the suspension, and disperse the dried powder cake to obtain the reaction precursor of the fluorescent powder. The reaction precursor was placed in a reducing atmosphere furnace and heated to 1450°C. After a holdin...

Embodiment 3

[0054] Firstly, 158g of ammonium bicarbonate was weighed to prepare an 8% aqueous solution, and heated to 55°C in a water bath. Then weigh Sr(NO 3 ) 2 197.66g, Ba(NO 3 ) 2 10.45g, Gd(NO 3 ) 3 1.32g, Eu(NO 3 ) 3 6.2g, SiO 2 18g is added to deionized water and is mixed with concentration and is 10.5% suspension, wherein SiO The purity is 99.9%, and the powder particle diameter d50 is 2.5 microns, and d90 is less than 5 microns, and the suspension is added and added in the ammonium bicarbonate solution, while Stir and keep warm for 60 minutes, then separate the suspension from water and powder, wash the powder cake to neutrality, redisperse the separated powder cake with deionized water and prepare a suspension with a mass percentage of 38%. Add 0.28 g of NaF to the suspension, ultrasonically disperse for 7 minutes, and then stir for 28 minutes, then dry the suspension, and disperse the dried powder cake to obtain the reaction precursor of the fluorescent powder. The rea...

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Abstract

The invention provides rare earth fluorescent powder and a preparation method thereof. The chemical structural formula of the rare earth fluorescent powder is Sr(3-x-y-z)BaxMepSiqO(3+2q+p / 2):Euy, Rz, wherein Me is at least one of Li, Na and K; R is at least one of La, Gd and Lu; x is more than or equal to 0.001 and less than or equal to 0.2; y is more than or equal to 0.001 and less than 0.12; z is more than or equal to 0.0001 and less than 0.08; p is more than or equal to 0.001 and less than 0.05; q is more than or equal to 0.65 and less than 1. The method can effectively control the grain diameter of the calcined product; and the prepared fluorescent powder has the advantages of small grain diameter, narrow distribution, high lighting effect, capability of effectively enhancing the lighting effect and light color consistency of a white LED, and high luminous performance, chemical stability and temperature quenching characteristic.

Description

technical field [0001] The invention belongs to a method for manufacturing fluorescent materials, in particular to a silicate matrix and orange-red rare earth fluorescent powder with europium as an activator and a method for manufacturing the same. Background technique [0002] In recent years, white light LED technology has developed rapidly, with GaN blue light and Y 3 al 5 o 12 : Ce 3+ (YAG:Ce) or Tb 3 al 5 o 12 : Ce 3+ (TAG) yellow light-emitting phosphor as a white light LED technology scheme composed of light conversion materials has been applied in many lighting fields. Due to its significant advantages over traditional light sources in terms of size, lifespan, environmental protection, and energy saving, it is expected to become the fourth-generation green lighting source that replaces compact energy-saving lamps. US Patent No. 5,998,925 adjusted and optimized YAG:Ce in terms of Y / Gd ratio and Al / Ga ratio. According to the latest technical reports, the lumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79
CPCY02B20/181Y02B20/00
Inventor 梁超何锦华符义兵
Owner JIANGSU BREE OPTRONICS CO LTD
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