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Europium-doped yttrium strontium triborate-based red fluorescent powder and preparation method thereof

A technology of fluorescent powder and triboric acid, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of high color temperature and low color rendering index of red fluorescent powder, and achieve high luminous intensity, good luminous performance, and strong operability Effect

Inactive Publication Date: 2018-12-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a europium-doped yttrium-strontium triborate-based red phosphor and its preparation method to solve the problems of low color rendering index and high color temperature of red phosphor existing in traditional white LEDs

Method used

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  • Europium-doped yttrium strontium triborate-based red fluorescent powder and preparation method thereof
  • Europium-doped yttrium strontium triborate-based red fluorescent powder and preparation method thereof
  • Europium-doped yttrium strontium triborate-based red fluorescent powder and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] According to chemical formula Sr 3 Y 0.99 (BO 3 ) 3 : Stoichiometric ratio of 0.01Eu, accurately weigh SrCO with electronic balance 3 , Y 2 o 3 、H 3 BO 3 、Eu 2 o 3 , wherein the purity of rare earth oxides is 99.99%, and the rest are analytically pure. After grinding and mixing the above raw materials evenly, put them into a corundum crucible, place them in a rapid heating resistance furnace, raise the temperature to 1200°C in an air atmosphere at a rate of 5°C / min, keep it warm for 5 hours, and then cool with the furnace, and wait for the sample to cool to room temperature. Take out the sample and grind it again to get Eu 3+ Doped yttrium strontium triborate red phosphor.

Embodiment 2

[0031] According to chemical formula Sr 3 Y 0.98 (BO 3 ) 3 : Stoichiometric ratio of 0.02Eu, accurately weigh SrCO with electronic balance 3 , Y 2 o 3 、H 3 BO 3 、Eu 2 o 3 , wherein the purity of rare earth oxides is 99.99%, and the rest are analytically pure. After grinding and mixing the above raw materials evenly, put them into a corundum crucible, place them in a rapid heating resistance furnace, raise the temperature up to 1200°C in an air atmosphere at a rate of 8°C / min, keep it warm for 5 hours, then cool with the furnace, and wait for the sample to cool to room temperature. Take out the sample and grind it again to get Eu 3+ Doped yttrium strontium triborate red phosphor.

Embodiment 3

[0033] According to chemical formula Sr 3 Y 0.96 (BO 3 ) 3: Stoichiometric ratio of 0.04Eu, accurately weigh SrCO with electronic balance 3 , Y 2 o 3 、H 3 BO 3 、Eu 2 o 3 , wherein the purity of rare earth oxides is 99.99%, and the rest are analytically pure. Grind and mix the above raw materials evenly, put them into a corundum crucible, place them in a rapid heating resistance furnace, raise the temperature to 1250°C in an air atmosphere at a rate of 10°C / min, keep it warm for 5 hours, then cool with the furnace, and wait for the sample to cool to room temperature. Take out the sample and grind it again to get Eu 3+ Doped yttrium strontium triborate red phosphor.

[0034] figure 1 Is the Sr prepared in Example 3 3 Y 0.96 (BO 3 ) 3 : 0.04Eu phosphor and Sr 3 Y(BO 3 ) 3 The X-ray diffraction pattern of the matrix and the Ba 3 Dy(BO 3 ) 3 Standard card (PDF#50-0098) comparison chart. Sr is currently not found in the PDF card library 3 Y(BO 3 ) 3 standa...

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Abstract

The invention discloses a europium-doped yttrium strontium triborate-based red fluorescent powder and a preparation method thereof. The general chemical formula of europium-doped yttrium strontium triborate-based red fluorescent powder is Sr3Y1-x(BO3)3:xEu, wherein x is greater than or equal to 0.01 and less than or equal to 0.15. The europium-doped yttrium strontium triborate-based red fluorescent powder can be effectively excited by near ultraviolet or blue light to emit red light with high color purity. According to tThe invention, prepares the red fluorescent powder is prepared on the basis of a solid-phase synthesis method, preparation is carried out under air atmosphere, the process is simple, the repeatability is good, the preparation period is short, no pollutants are discharged, the red fluorescent powder the invention is environmentally -friendly, and operation and industrial production are easy.

Description

technical field [0001] The invention belongs to the technical field of fluorescent powder for LEDs, and relates to a europium-doped yttrium strontium triborate-based red fluorescent powder and a preparation method thereof. Background technique [0002] Light Emitting Diode (LED) is recognized as a new light source in the 21st century. It has many advantages such as energy saving, fast response, green environmental protection, long life, small size, and high luminous efficiency. Application prospect. [0003] At present, commercial white LEDs produce white light mainly through the blue light generated by GaIn-based chips to excite YAG:Ce 3+ Phosphor, but the white light produced lacks red components, resulting in a low color rendering index (Ra<80) and a high correlated color temperature (CCT>7000K), which can only meet the requirements of ordinary lighting. Red, green, and blue phosphors are coated on the near-ultraviolet LED chip, and the blue, green, and red phosph...

Claims

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Application Information

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IPC IPC(8): C09K11/78
CPCC09K11/7797
Inventor 武秀兰郑金乐任强海鸥白文妮任宇涵
Owner SHAANXI UNIV OF SCI & TECH
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