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Molybdate-based europium-doped red phosphor suitable for white light LED, and preparation method thereof

A technology of red phosphor and molybdate, applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve problems such as instability, easy deliquescence, and weak luminescent performance of red phosphor, and achieve short production cycle , good reproducibility and good luminous performance

Inactive Publication Date: 2017-11-21
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a molybdate-based europium-doped red fluorescent powder suitable for white light LEDs, which solves the problems of the existing red fluorescent powder with weak luminous performance, serious light attenuation, instability and easy deliquescence

Method used

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  • Molybdate-based europium-doped red phosphor suitable for white light LED, and preparation method thereof
  • Molybdate-based europium-doped red phosphor suitable for white light LED, and preparation method thereof
  • Molybdate-based europium-doped red phosphor suitable for white light LED, and preparation method thereof

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Embodiment 1

[0033] Take x=0.02, according to the chemical formula Li 3 Sr 2 Gd 2.98 (MoO 4 ) 8 :0.02Eu 3+ The stoichiometric ratio, weigh Li respectively with electronic balance 2 CO 3 、Sr 2 CO 3 、Gd 2 o 3 、MoO 3 and Eu 2 o 3As 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, a calcined product was obtained; the calcined product was taken out and ground again for 10 minutes, and a molybdate-based europium-doped red phosphor suitable for white LEDs was obtained.

[...

Embodiment 2

[0036] Take x=0.04, according to chemical formula Li 3 Sr 2 Gd 2.96 (MoO 4 ) 8 :0.04Eu 3+ The stoichiometric ratio, weigh Li respectively with electronic balance 2 CO 3 、Sr 2 CO 3 、Gd 2 o 3 、MoO 3 and Eu 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, a calcined product was obtained; the calcined product was taken out and ground again for 20 minutes to obtain a molybdate-based europium-doped red phosphor suitable for white LEDs.

Embodiment 3

[0038] Take x=0.06, according to chemical formula Li 3 Sr 2 Gd 2.94 (MoO 4 ) 8 :0.06Eu 3+ The stoichiometric ratio, weigh Li respectively with electronic balance 2 CO 3 、Sr 2 CO 3 、Gd 2 o 3 、MoO 3 and Eu 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 900 ° C at a rate of 5 ° 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, a calcined product was obtained; the calcined product was taken out and ground again for 20 minutes to obtain a molybdate-based europium-doped red phosphor suitable for white LEDs.

[0039] ...

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Abstract

The invention discloses a molybdate-based europium-doped red phosphor suitable for white light LED, wherein molybdate is used as a matrix, the chemical general formula is Li3Sr2Gd3-x(MoO4)8:xEu<3+>, x is more than or equal to 0.02 and is less than or equal to 0.30, the molybdate-based europium-doped red phosphor suitable for white light LED is prepared by doping activated ions Eu<3+>, the red light having characteristics of strong light emitting intensity and high color purity and having a main peak positioned at near 619 nm under the excitation of ultraviolet and blue light, the chemical properties are stable, and the color rendering property is good. The invention further discloses a preparation method of the molybdate-based europium-doped red phosphor, wherein the preparation method comprises: carrying out mixing grinding on Li2CO3, Sr2CO3, Gd2O3, MoO3 and Eu2O3, calcining in an air atmosphere, carrying out thermal insulation, cooling along with the furnace, and grinding to obtain the molybdate-based europium-doped red phosphor suitable for white light LED, and the method has advantages of strong operability, good reproducibility, short preparation period.

Description

technical field [0001] The invention belongs to the technical field of fluorescent powder preparation for LEDs, and specifically relates to a molybdate-based europium-doped red phosphor suitable for white LEDs, and also relates to a preparation method of the molybdate-based europium-doped red phosphor. Background technique [0002] In recent years, white LEDs have been hailed as a new generation of lighting sources due to their small size, low energy consumption, long life, high stability and environmental friendliness. After years of development, LED diodes have been commercialized and low-cost. cost-proven manufacturing process. [0003] White light LEDs can generally be divided into the following three categories: fluorescent conversion type, multi-chip combination type, and single-chip multi-quantum well type. However, based on the consideration of process, technology and cost, the current research focus is still on the fluorescent conversion type white light LED. , tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
CPCC09K11/7794Y02B20/00
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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