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Preparation method of Eu<3+> doped molybdate red fluorescent powder used for white light LED (Light Emitting Diode)

A molybdate, white light technology, applied in the field of physics, can solve problems such as poor performance of phosphors, and achieve the effects of improving luminous intensity and thermal stability, reducing synthesis temperature and loosening powder.

Inactive Publication Date: 2016-12-07
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a kind of Eu 3+ The preparation method of doping molybdate red powder, described this white light LED uses Eu 3+ The preparation method of doped molybdate red powder needs to solve the technical problem of poor performance of phosphor powder in the prior art

Method used

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  • Preparation method of Eu&lt;3+&gt; doped molybdate red fluorescent powder used for white light LED (Light Emitting Diode)
  • Preparation method of Eu&lt;3+&gt; doped molybdate red fluorescent powder used for white light LED (Light Emitting Diode)
  • Preparation method of Eu&lt;3+&gt; doped molybdate red fluorescent powder used for white light LED (Light Emitting Diode)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1Sr 2 CaO 6 :0.03Eu 3+ The synthesis method is as follows:

[0027] With the chemical formula Sr 2 CaO 6 :0.03Eu 3+ The stoichiometric ratio in weighs an appropriate amount of SrCO 3 、Eu 2 o 3 , CaCO 3 and MoO 3 As a raw material, take Li by weighing 3% of the total reactant mass. 2 CO 3 , and use it as a flux, then put the raw material and flux in an agate mortar, mix and grind; put the ground raw material into a corundum crucible, put the crucible into Al 2 o 3 Sagger, while placing SiC auxiliary heat material on the outer wall of the sagger; Al 2 o 3Put the sagger in the heat preservation bucket, and fill the insulation cotton between the sagger and the heat preservation bucket, and then put the heat preservation bucket into the microwave oven; by adjusting the power, heat it to 600°C under normal pressure at a heating rate of 50°C / min. Keep warm for 3 hours, then heat to 900°C at the same heating rate, and keep warm for 3 hours; after the reac...

Embodiment 2

[0029] Example 2Sr 2 CaO 6 :0.05Eu 3+ The synthesis method is as follows:

[0030] With the chemical formula Sr 2 CaO 6 :0.05Eu 3+ The stoichiometric ratio in weighs an appropriate amount of SrCO 3 、Eu 2 o 3 , CaCO 3 and MoO 3 As a raw material, weigh LiF according to 1% of the total reactant mass, and use it as a flux, then put the raw material and flux in an agate mortar, mix and grind; put the ground raw material into a corundum crucible , put the crucible into Al 2 o 3 Sagger, while placing SiC auxiliary heat material on the outer wall of the sagger; Al 2 o 3 Put the sagger in the heat preservation bucket, and fill the insulation cotton between the sagger and the heat preservation bucket, and then put the heat preservation bucket into the microwave oven; by adjusting the power, heat it to 600°C under normal pressure at a heating rate of 50°C / min. Keep warm for 3 hours, then heat to 950°C at the same heating rate, keep warm for 3 hours, turn off the microwave ...

Embodiment 3

[0031] Example 3Sr 2 CaO 6 :0.15Eu 3+ The synthesis method is as follows:

[0032] With the chemical formula Sr 2 CaO 6 :0.15Eu 3+ The stoichiometric ratio in weighs an appropriate amount of SrCO 3 、Eu 2 o 3 , CaCO 3 and MoO 3 As a raw material, weigh NaF according to 10% of the total reactant mass, and use it as a flux, then put the raw material and flux in an agate mortar, mix and grind; put the ground raw material into a corundum crucible , put the crucible into Al 2 o 3 Sagger, while placing SiC auxiliary heat material on the outer wall of the sagger; Al 2 o 3 Put the sagger in the heat preservation bucket, and fill the insulation cotton between the sagger and the heat preservation bucket, and then put the heat preservation bucket into the microwave oven; by adjusting the power, heat it to 600°C under normal pressure at a heating rate of 50°C / min. Keep it warm for 3 hours, then heat it to 750°C at the same heating rate, keep it warm for 3 hours, turn off the ...

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Abstract

The invention discloses a preparation method of Eu<3+> doped molybdate red fluorescent powder used for a white light LED (Light Emitting Diode). A chemical formula of the red fluorescent powder is Sr2CaMoO6:xEu<3+>, wherein x is greater than or equal to 0.01 and less than or equal to 0.15. Raw materials are weighed according to a stoichiometric ratio, the raw materials and a fluxing agent are fully and evenly mixed, and a mixture is added into double crucibles made of corundum, wave absorbent is arranged between the double crucibles, the double crucibles are loaded into a microvan, temperature is quickly raised to 750 to 950DEG C, the mixture is sintered in an oxidation environment, and heat preservation time is 0.5 to 4h; finally, cooling, grinding, washing and drying are carried out to obtain the red fluorescent powder used for the white light LED. During microvan sintering, the fluxing agent is added to accelerate the formation and growth of molybdate polycrystal, the sintering degree of the fluorescent powder is obviously lowered, sintering time is obviously shortened, a powder body is loose and does not need to be mechanically smashed, in addition, the shapes of aluminate fluorescent powder particles are effectively controlled, and the particles with a small particle diameter and even distribution are obtained, wherein the appearance of the particles is similar to a sphere.

Description

technical field [0001] The invention belongs to the field of physics, and relates to a fluorescent powder used in displays, fluorescent lamps, LEDs, light storage materials, etc., specifically a Eu 3+ The preparation method of doped molybdate red powder. Background technique [0002] Semiconductor white light-emitting diode (white LED) is a new type of solid-state lighting source, which has the advantages of high luminous efficiency, long life, small size, low working voltage, no pollution, energy saving and environmental protection, etc. In recent years, blue, purple and near ultraviolet LEDs have become more popular The rapid development has made it possible for LEDs to replace incandescent and fluorescent lamps in the field of general lighting as a new generation of green light sources. [0003] Sr 2 CaO 6 :Eu 3+ Belonging to the double perovskite molybdate oxide, the compound belongs to the cubic crystal system, the space group is Fm3m, the lattice constant is α=8.28...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68H01L33/50
CPCC09K11/7736H01L33/502Y02B20/00
Inventor 张彦李雨萌王洪超徐家跃李杰夏土良
Owner SHANGHAI INST OF TECH
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