Molybdate base samarium doped red fluorescent powder applicable to white light LED and preparing method thereof

A technology of red fluorescent powder and molybdate, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of easy deliquescence, poor luminous performance and instability of red fluorescent powder, and achieve short production cycle and high experimental conditions. , good reproducibility

Inactive Publication Date: 2017-11-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a molybdate-based samarium-doped red phosphor suitable for white LEDs, which solves the problems of existing red phosphors with poor luminous performance, serious light attenuation, instability and easy deliquescence

Method used

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  • Molybdate base samarium doped red fluorescent powder applicable to white light LED and preparing method thereof
  • Molybdate base samarium doped red fluorescent powder applicable to white light LED and preparing method thereof
  • Molybdate base samarium doped red fluorescent powder applicable to white light LED and preparing method thereof

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Embodiment 1

[0034] Take x=0.01, according to the chemical formula Li 3 Sr 2 Gd 2.99 (MoO 4 ) 8 :0.01Sm 3+ The stoichiometric ratio, weigh Li respectively with electronic balance 2 CO 3 、Sr 2 CO 3 、Gd 2 o 3 、MoO 3 and Sm 2 o 3 As raw materials, the purity of rare earth oxides is 99.99%, and the rest are analytically pure; mix all the above-mentioned raw materials and grind them for 30 minutes to mix the raw materials evenly to obtain a mixture; put the obtained mixture into corundum Put the corundum crucible in a rapid heating resistance furnace, calcined in the air atmosphere, during this period, the temperature was raised to 700 °C at a rate of 3 °C / min, and kept for 8 hours. After the calcination was completed, it was cooled with the furnace until it was cooled to At room temperature, the calcined product was obtained; the calcined product was taken out and ground again for 10 min, and the chemical formula was Li 3 Sr 2 Gd 2.99 (MoO 4 ) 8 :0.01Sm 3+ Molybdate-based sa...

Embodiment 2

[0036] Take x=0.03, according to chemical formula Li 3 Sr 2 Gd 2.97 (MoO 4 ) 8 :0.03Sm 3+ The stoichiometric ratio, weigh Li respectively with electronic balance 2 CO 3 、Sr 2 CO 3 、Gd 2 o 3 、MoO 3 and Sm 2 o 3 As raw materials, the purity of rare earth oxides is 99.99%, and the rest are analytically pure; mix all the above-mentioned raw materials and grind them for 40 minutes to mix the raw materials evenly to obtain a mixture; put the obtained mixture into corundum Put the corundum crucible in a rapid heating resistance furnace, and calcined it in an air atmosphere. During this period, the temperature was raised to 800°C at a rate of 6°C / min, and kept for 10h. After the calcination was completed, it was cooled with the furnace until it was cooled to At room temperature, the calcined product was obtained; the calcined product was taken out and grinded again for 20 minutes to obtain the chemical formula Li 3 Sr 2 Gd 2.97 (MoO 4 ) 8 :0.03Sm 3+ Molybdate-based ...

Embodiment 3

[0039] Take x=0.05, according to the chemical formula Li 3 Sr 2 Gd 2.95 (MoO 4 ) 8 :0.05Sm 3+ The stoichiometric ratio, weigh Li respectively with electronic balance 2 CO 3 、Sr 2 CO 3 、Gd 2 o 3 、MoO 3 and Sm 2 o 3 As raw materials, the purity of rare earth oxides is 99.99%, and the rest are analytically pure; mix all the above-mentioned raw materials and grind them for 60 minutes to mix the raw materials evenly to obtain a mixture; put the obtained mixture into corundum Put the corundum crucible in a rapid heating resistance furnace, calcined in the air atmosphere, during this period, the temperature was raised to 1000 ° C at a rate of 8 ° C / min, and kept for 12 hours. After the calcination was completed, it was cooled with the furnace until it was cooled to At room temperature, the calcined product was obtained; the calcined product was taken out and ground again for 30 minutes, and the chemical formula was Li 3 Sr 2 Gd 2.95 (MoO 4 ) 8 :0.05Sm 3+ Molybdat...

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Abstract

The invention discloses molybdate base samarium doped red fluorescent powder applicable to a white light LED. Molybdate serves as a substrate, the general chemical formula is Li3Sr2Gd(3-x)(MoO4)8: xSm3+, wherein x is bigger than or equal to 0.01 and smaller than or equal to 0.2, the molybdate base samarium doped red fluorescent powder applicable to the white light LED is prepared by doping an active ion Sm3+, the problems are solved that existing commercialized red fluorescent powder is poor in luminescence property and has serious light decay and instability and slaking does not occur easily, and the molybdate base samarium doped red fluorescent powder is stable in chemical property and good in color rendering; the invention further discloses a preparing method of the molybdate base samarium doped red fluorescent powder. The method comprises the steps of mixing and grinding Li2CO3, Sr2CO3, Gd2O3, MoO3 and Sm2O3, performing calcination under air atmosphere, conducting heat preservation, then conducting grinding after furnace cooling, and finally obtaining the molybdate base samarium doped red fluorescent powder applicable to the white light LED. The fluorescent powder is prepared based on solid-phase synthesis, the reproducibility is good, and the preparing period is short.

Description

technical field [0001] The invention belongs to the technical field of phosphor preparation for LEDs, and in particular relates to a molybdate-based samarium-doped red phosphor suitable for white LEDs, and also relates to a preparation method of the molybdate-based samarium-doped red phosphor. Background technique [0002] LED light-emitting diodes are semiconductor components that can perform photoelectric conversion with high efficiency. White LEDs that use LEDs as excitation light sources have attracted widespread attention due to their low energy consumption, long life, high stability, light weight and no pollution. [0003] At present, white light LEDs are mainly fluorescent conversion type. This type mainly includes blue LEDs and yellow phosphors to achieve white light. However, due to the lack of red components, the color rendering index of this method is too low, and the cold color light is not conducive to indoor lighting. Another method is to excite red, green, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 任强林飞武秀兰海鸥焦叶辉白文妮李欢欢
Owner SHAANXI UNIV OF SCI & TECH
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