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Preparation method of tri-phosphor double-peak blue fluorescent powders for lamp

A technology of blue phosphor and three primary colors is applied in the field of preparation of bimodal blue phosphor to achieve the effects of good thermal stability, uniform powder particles and simple preparation process

Inactive Publication Date: 2013-04-03
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, adding too much flux will cause the powder to agglomerate severely, requiring longer ball milling, because ball milling will introduce new solid defects, resulting in a decrease in the brightness of BAM

Method used

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  • Preparation method of tri-phosphor double-peak blue fluorescent powders for lamp
  • Preparation method of tri-phosphor double-peak blue fluorescent powders for lamp
  • Preparation method of tri-phosphor double-peak blue fluorescent powders for lamp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to Ba 1-x MgAl 10 o 17 :(Eu 2+ , Mn 2+ ) Stoichiometric ratio Weigh 3.735g α-Al raw materials respectively 2 o 3 , 0.275gMgO, 0.855gBaCO 3 , 0.12gEu 2 o 3 , 0.015gMnCO 3 , 0.025gCaF 2 , 0.300gBaF 2 (All the above raw materials are analytically pure), put all the raw materials into a ball mill and add an appropriate amount of alcohol to ball mill for 1 hour; put the mixed raw materials into a corundum crucible under H 2 / N 2 (5 / 95%) atmosphere at 1350-1500°C for 4 hours, cooled to room temperature to obtain the final calcined product; the final calcined product was ground, washed, filtered, dried and sieved to obtain BAM blue phosphor. After calcining at 550° C. and 600° C. for half an hour in an air atmosphere, heat-treated BAM blue phosphor powder was obtained.

Embodiment 2

[0026] According to Ba 1-x MgAl 10 o 17 :(Eu 2+ , Mn 2+ ) stoichiometric ratio weighed 3.735gα-Al respectively 2 o 3 , 0.275gMgO, 0.855gBaCO 3 , 0.12gEu 2 o 3 , 0.015gMnCO 3 , 0.05gCaF 2 , 0.300gBaF 2 (All the above raw materials are analytically pure), put all the raw materials into a ball mill and add an appropriate amount of alcohol to ball mill for 1 hour; put the mixed raw materials into a corundum crucible for H 2 / N 2(5 / 95%) atmosphere at 1350-1500°C for 4 hours, cooled to room temperature to obtain the final calcined product; the final calcined product was ground, washed, filtered, dried, and sieved to obtain BAM blue phosphor. After calcining at 550° C. and 600° C. for half an hour in an air atmosphere, heat-treated BAM blue phosphor powder was obtained.

Embodiment 3

[0028] According to Ba 1-x MgAl 10 o 17 :(Eu 2+ , Mn 2+ ) stoichiometric ratio weighed 3.735gα-Al respectively 2 o 3 , 0.275gMgO, 0.855gBaCO 3 , 0.12gEu 2 o 3 , 0.015gMnCO 3 , 0.025gCaF 2 , 0.200gBaF 2 (All the above raw materials are analytically pure), put all the raw materials into a ball mill and add an appropriate amount of alcohol to ball mill for 1 hour; put the mixed raw materials into a corundum crucible for H 2 / N 2 (5 / 95%) atmosphere at 1350-1500°C for 4 hours, cooled to room temperature to obtain the final calcined product; the final calcined product was ground, washed, filtered, dried and sieved to obtain BAM blue phosphor. After calcining at 550° C. and 600° C. for half an hour in an air atmosphere, heat-treated BAM blue phosphor powder was obtained.

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Abstract

The invention discloses a preparation method of tri-phosphor double-peak fluorescent powders used for an energy-saving lamp, which has high heat stability and high brightness. The preparation method of the tri-phosphor double-peak blue fluorescent powders for the lamp comprises the steps of firstly weighing each chemical component according to a chemical expression of fluorescent material, then adding BaF2 being 0.1wt%-10.0wt% of the total weight of all chemical components, and CaF2 being 0.01wt%-4.0wt% of the total weight of the all chemical components, sufficiently and uniformly mixing the raw materials, and then burning and reacting sufficiently at 1350-1500 DEG C under the atmosphere of reduction gas and inert gas to obtain a final burning product, then grinding, washing, filtering, drying and screening the burned product to obtain the tri-phosphor double-peak blue fluorescent powders for the lamp. Due to the adoption of the method, the blue fluorescent powders with regular particle morphology, uniform particle size, relatively high brightness and high heat stability, and according to the preparation method, the preparation process is simple, a one-step reduction method is adopted, and the industrial large-scale production is facilitated.

Description

technical field [0001] The invention relates to a preparation method of a luminescent material, in particular to a preparation method of a bimodal blue fluorescent powder used in an energy-saving lamp with high thermal stability and high luminous brightness. Background technique [0002] Rare earth aluminate Ba activated by europium and manganese 1-x MgAl 10 o 17 :(Eu 2+ , Mn 2+ ) where 0.01≤X≤0.45 (referred to as BAM blue phosphor) can be effectively excited under the irradiation of 147nm, 172nm vacuum ultraviolet rays and 254nm ultraviolet rays, and emit blue fluorescence with a main peak wavelength of about 455nm, which has good luminescence Efficiency and color purity, it is the rare earth three-primary-color double-peak blue phosphor used in high-brightness energy-saving lamps. [0003] At present, the methods for preparing rare-earth trichromatic bimodal blue phosphors for lamps include: high-temperature solid-phase method, sol-gel method, hydrothermal method, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
Inventor 王育华张水合冶林琴朋兴平张尚虎于化琴李树胜方中心徐玉君马彩红董小芳
Owner LANZHOU UNIVERSITY
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