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Shell-grade green illuminating material for lamp and preparing method

A technology of light-emitting material and shell layer, applied in the field of green light-emitting material and its preparation, can solve the problems of large particle size of phosphor powder and mismatch of density and size, and achieve the effect of convenient operation and low cost of direct material

Inactive Publication Date: 2007-11-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have to undergo high-temperature burning [3], and the synthetic phosphors have a large particle size. When the phosphors are mixed, they show a mismatch in density.

Method used

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  • Shell-grade green illuminating material for lamp and preparing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Measure according to La: Ce: Tb=50:35:15 (molar ratio), weigh analytically pure LaCl 3 ·6H 2 O, CeCl 3 ·7H 2 O, TbCl 3 ·6H 2 O, take the stoichiometric 1.0 times (NH 4 ) 2 HPO 4 and an appropriate amount of surfactant polyvinyl alcohol are put into a ceramic ball mill jar, the mass ratio of the raw material to the ceramic ball is 1:1, and an appropriate amount of lubricant ethanol is added. Ball mill at room temperature for 2.0 hours; take out the product, wash it with distilled water several times, and then wash it with ethanol three times; dry it in an oven at 80°C; calcinate the dried product at 700°C for 2.0 hours to obtain white nano-LaPO 4 : Ce 3+ , Tb 3+ Powder. The central particle diameter is 110-130nm.

[0044] Measured according to La: Ce=60:40 (molar ratio), weigh La 2 o 3 , CeO 2 (≥99.99%), take 1.0 times of stoichiometric reaction (NH 4 ) 2 HPO 4 , into a ball mill tank and mixed evenly; calcined at 1200 ° C for 3.0 hours; cooled; crushed;...

Embodiment 2

[0046] Get the (LaCe) PO that embodiment 1 obtains 4 , use 0.15mol / L hydrochloric acid solution to treat the powder surface for 1.0h.; add a small amount of ammonia water to neutralize; filter; press (LaCe)PO 4 20% by weight take LaPO 4 : Ce 3+ , Tb 3+ Green powder, stir and disperse in appropriate amount of deionized water; add 5% (mol) H 3 BO 3 and 2% (mol) Li 2 CO 3 , then added the treated aqueous (LaCe)PO 4 Powder, stir and mix into a uniform slurry; dry in an oven at 75°C; dry powder into an atmosphere-controlled high-temperature furnace 2 Sintering at 950°C for 3.0 hours in a hydrogen-nitrogen mixed atmosphere; crushing and grading; the finished product is obtained;

[0047] The main emission peak of the product is 545nm; the color coordinates x=0.3510, y=0.5739; the relative intensity is 98.1%.

Embodiment 3

[0049] Get the (LaCe) PO that embodiment 1 obtains 4 , use 0.2mol / L hydrochloric acid solution to treat the powder surface for 1.5h.; add a small amount of ammonia water to neutralize; filter; press (LaCe)PO 4 30% by weight take LaPO 4 : Ce 3+ , Tb 3+ Green powder, stir and disperse in appropriate amount of deionized water; add 5% (mol) H 3 BO 3 and 2% (mol) Li 2 CO 3 , then added the treated aqueous (LaCe)PO 4 Powder, stir and mix into a uniform slurry; dry in an oven at 80°C; dry powder into an atmosphere-controlled high-temperature furnace, 2 Sintering in a hydrogen-nitrogen mixed atmosphere at 1200°C for 2.0 hours; crushing and grading; the finished product is obtained;

[0050] The main emission peak of the product is 545nm; the color coordinates x=0.3508, y=0.5745; the relative intensity is 102.3%.

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Abstract

This invention relates to the lamp encasement gradient green luminescent material and the preparation method. The method uses the solid powder technique, and the powder body is the nuclear shell structure, the powder body essence is (LaCe)PO4, outer shell LaPO4:Ce3+, the shell is Tb3+, the essence center particle size 5-8 mum. This invention uses the normal temperature solid phase synthesis to make the nanometer green powder forerunner body, the operation is easy; Carry on the size grading with the graduation equipment to the (LaCe)PO4 powder body, so it is easy for carrying on the adjustment operation on the powder body granularity; The nanometer green powder LaPO4:Ce3+, Tb3+ product granularity is small, is bigger than the surface area, and its activeness is high, so it is convenient to spread in the (LaCe)PO4 surface, easy to burn to the shell. The product powder body's interior is the (LaCe)PO4 nucleus, does not contain Tb, and the product manufacturing's direct materials cost is low; The LaPO4:Ce3+, Tb3+ used illumination encasement which the nanomaterials sintering process forms, the illumination is high. This invention will impel the formalization production and the application. Of the low terbium high performance green luminescent material LaPO4:Ce3+, Tb3+.

Description

technical field [0001] The invention relates to a green luminescent material for an energy-saving fluorescent lamp and a preparation method thereof. Background technique [0002] Rare earth orthophosphate LaPO co-activated with cerium and terbium 4 : Ce 3+ , Tb 3+ (LAP for short) crystal is a photoluminescent material that emits green light and is widely used in the production of energy-saving fluorescent lamps. [0003] in la x Ce y Tb 1-x-y PO 4 Among them, x is between 0.4-0.6, among which x+y>0.8, it has high luminous efficiency under the excitation of vacuum ultraviolet light[1], and it has low synthesis temperature, moderate particle size, yellowish luminous color, color The coordinate x value is high, and it is beneficial to save expensive rare earth red phosphors when mixing phosphors. It is widely used in lamps, cathode ray tubes (CRTs) and plasma flat panel displays (PDP). [0004] With the development of lighting and display technology, higher requireme...

Claims

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Application Information

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IPC IPC(8): C09K11/81C09K11/02H01J61/44
Inventor 胡启阳李新海王志兴郭华军
Owner CENT SOUTH UNIV