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Calcium-titanium pyrophosphate fluorescent powder for LED and preparation method for calcium-titanium pyrophosphate fluorescent powder

A technology of calcium pyrophosphate and fluorescent powder, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of high price and achieve high stability and high luminous intensity

Inactive Publication Date: 2016-09-07
DONGTAI TIANYUAN FLUORESCENT MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rare earth element three-color phosphor also has its disadvantages, and its biggest disadvantage is that it is expensive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: Preparation of calcium titanium pyrophosphate phosphor

[0030] Chemical composition is Ca 2-x Ti(P 2 o 7 ) 2 :xEu 2+ ; Wherein, x takes a value of 0.10 and is prepared through the following steps:

[0031] Step S1, according to chemical composition Ca 2-x Ti(P 2 o 7 ) 2 :xEu 2+ The stoichiometric ratio of raw materials is weighed, and the raw materials are a mixture of calcium carbonate, titanium dioxide, sodium pyrophosphate and europium oxide, wherein x takes a value of 0.10;

[0032] Step S2, adding flux for grinding, grinding and mixing to obtain a mixture;

[0033] Step S3, filling the mixture obtained in step S2 into a crucible, sintering in a high-temperature furnace under a reducing atmosphere at 1500° C. for 5 hours, and cooling to obtain the calcium titanium pyrophosphate phosphor;

[0034] Wherein, the addition amount of fluxing agent is 0.8% of raw material weight, and described fluxing agent is the mixture of ammonium hydrogen phos...

Embodiment 2

[0035] Embodiment 2: Preparation of calcium titanium pyrophosphate phosphor

[0036] Chemical composition is Ca 2-x Ti(P 2 o 7 ) 2 :xEu 2+ ; Wherein, x takes a value of 0.04 and is prepared through the following steps:

[0037] Step S1, according to chemical composition Ca 2-x Ti(P 2 o 7 ) 2 :xEu 2+ The stoichiometric ratio of the raw material is weighed, and the raw material is a mixture of calcium carbonate, titanium dioxide, sodium pyrophosphate and europium oxide, wherein x takes a value of 0.04;

[0038] Step S2, adding flux for grinding, grinding and mixing to obtain a mixture;

[0039] Step S3, filling the mixture obtained in step S2 into a crucible, sintering in a high-temperature furnace under a reducing atmosphere at 1400° C. for 6 hours, and cooling to obtain the calcium titanium pyrophosphate phosphor;

[0040] Wherein, the addition amount of fluxing agent is 0.7% of raw material weight, and described fluxing agent is the mixture of ammonium hydrogen pho...

Embodiment 3

[0041] Embodiment 3: Preparation of calcium titanium pyrophosphate phosphor

[0042] Chemical composition is Ca 2-x Ti(P 2 o 7 ) 2 :xEu 2+ ; Wherein, x takes a value of 0.20 and is prepared through the following steps:

[0043] Step S1, according to chemical composition Ca 2-x Ti(P 2 o 7 ) 2 :xEu 2+The stoichiometric ratio of raw materials is weighed, and the raw materials are a mixture of calcium carbonate, titanium dioxide, sodium pyrophosphate and europium oxide, wherein x takes a value of 0.20;

[0044] Step S2, adding flux for grinding, grinding and mixing to obtain a mixture;

[0045] Step S3, filling the mixture obtained in step S2 into a crucible, sintering in a high-temperature furnace under a reducing atmosphere at 1600° C. for 4 hours, and cooling to obtain the calcium titanium pyrophosphate phosphor;

[0046] Wherein, the addition amount of fluxing agent is 0.9% of raw material weight, and described fluxing agent is the mixture of ammonium hydrogen phosp...

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PUM

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Abstract

The invention discloses calcium-titanium pyrophosphate fluorescent powder for an LED (Light-Emitting Diode) and a preparation method for the calcium-titanium pyrophosphate fluorescent powder. The composition of the calcium-titanium pyrophosphate fluorescent powder is Ca2-xTi(P2O7)2:xEu<2+>, wherein the value of the x is between 0.04 and 0.20; the calcium-titanium pyrophosphate fluorescent powder is prepared by the following steps: S1, weighing raw materials, namely, calcium carbonate, titanium dioxide and a mixture of sodium pyrophosphate and europium oxide according to the stoichiometric ratio of the Ca2-xTi(P2O7)2:xEu<2+>, wherein the value of the x is between 0.04 and 0.20; S2, adding a fluxing agent for grinding, and grinding uniformly to obtain a mixture; S3, putting the mixture obtained in the S2 into a crucible, sintering for 4 to 6 hours in a high-temperature furnace under the conditions of reducing atmosphere and 1,400 to 1,600 DEG C, and cooling to obtain the calcium-titanium pyrophosphate fluorescent powder, wherein the adding amount of the fluxing agent is 0.7 to 0.9 percent of the weight of the raw materials; the fluxing agent is a mixture of ammonium hydrogen phosphate and sodium nitrite; the ammonium hydrogen phosphate and the sodium nitrite are in the weight ratio of (6 to 8):1. The calcium-titanium pyrophosphate fluorescent powder provided by the invention has the advantages of high light intensity and high stability which are related to the weight ratio of the ammonium hydrogen phosphate to the sodium nitrite in the fluxing agent; the light intensity is highest when the ammonium hydrogen phosphate and the sodium nitrite are in the weight ratio of (6 to 8):1.

Description

technical field [0001] The invention belongs to the field of luminescent materials, and in particular relates to calcium titanium pyrophosphate fluorescent powder for LEDs and a preparation method thereof. Background technique [0002] In 1974, Philips of the Netherlands first successfully developed phosphor powders yttrium oxide (red light, peak wavelength 611nm) and magnesium polyaluminate (green light, peak wavelength 541nm) and barium polyaluminate (blue light, peak wavelength 450nm) are mixed in a certain proportion to form a three-color phosphor (the full name is a rare earth element three-color phosphor), and its luminous efficiency is high (average luminous efficiency is 80lm / W or more, about 5 times that of incandescent lamps), the color temperature is 2500K-6500K, and the color rendering index is around 85. Using it as a raw material for fluorescent lamps can greatly save energy, which is the origin of high-efficiency energy-saving fluorescent lamps. It can be sa...

Claims

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Application Information

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IPC IPC(8): C09K11/71
CPCC09K11/7738
Inventor 胡程王晶尹向南徐达
Owner DONGTAI TIANYUAN FLUORESCENT MATERIALS CO LTD