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Preparation method of YAG (yttrium aluminum garnet): Ce rare earth fluorescent powder

A rare earth phosphor and phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of high cost and low performance, and achieve the effects of low production cost, lower activation energy, and production cost saving

Inactive Publication Date: 2012-03-28
宁波浩威尔新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its cost is high and its performance is far lower than that of products prepared by solid phase method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of preparation YAG: the method for Ce rare earth fluorescent powder, its target fluorescent powder is that molecular formula is Y 2.95 Al 5 o 12 : Ce 0.05 Rare earth-doped yttrium aluminum garnet phosphor; using the following steps:

[0017] 1) According to the target phosphor formula Y 2.95 Al 5 o 12 : Ce 0.05 The molar ratio shown weighs 3.331gY of metal oxide 2 o 3 (4N), 2.549g Al 2 o 3 (4N) and 0.086gCeO 2 (4N); then take by weighing 0.030gYAG (D 50 =300nm) crystal seed; Then take by weighing 0.300g flux by 5% of reactant gross mass, flux is made up of sodium fluoride and boric acid, wherein sodium fluoride 0.15g, boric acid 0.15g; Above-mentioned metal oxide, YAG The seed crystal and the flux are mixed to obtain a mixture;

[0018] 2) adjust the above mixture to the rheological phase with ethanol, stir for 6 hours,

[0019] 3) Then heat-preserve and dry in an oven at 80°C for 24 hours;

[0020] 4) The product obtained in step 3) is placed in a...

Embodiment example 2

[0043] A kind of preparation YAG: the method for Ce rare earth fluorescent powder, its target fluorescent powder is that molecular formula is Y 2.45 Gd 0.5 al 5 o 12 : Ce 0.05 Rare earth-doped yttrium aluminum garnet phosphor; using the following steps:

[0044] 1) According to the target phosphor formula Y 2.45 Gd 0.5 al 5 o 12 : Ce 0.05 The molar ratio shown weighs 2.766gY of metal oxide 2 o 3 (4N), 2.549g Al 2 o 3 (4N), 0.906g Gd 2 o 3 (4N) and 0.086gCeO 2 (4N); then take by weighing 0.006gYAG (D 50 =300nm) crystal seed; then take by weighing 0.032g flux by 0.5% of reactant gross mass, flux is made up of barium fluoride and boric acid, wherein barium fluoride 0.015g, boric acid 0.015g; Above-mentioned metal oxide, YAG The seed crystal and the flux are mixed to obtain a mixture;

[0045] 2) adjust the above mixture to rheological phase with ethanol, stir for 24 hours,

[0046] 3) Then heat-preserve and dry in an oven at 120° C. for 6 hours;

[0047] 4) The...

Embodiment example 3

[0050] A kind of preparation YAG: the method for Ce rare earth fluorescent powder, its target fluorescent powder is that molecular formula is Y 2.95 al 4.0 Ga 1.0 o 12 : Ce 0.05 Rare earth-doped yttrium aluminum garnet phosphor; using the following steps:

[0051] 1) According to the target phosphor formula Y 2.95 al 4.0 Ga 1.0 o 12 : Ce 0.05 The molar ratio shown weighs 3.331gY of metal oxide 2 o 3 (4N), 2.039g Al 2 o 3 (4N), 0.937gGa 2 o 3 (4N) and 0.086gCeO 2 ; Then take by weighing 0.1279gYAG (D 50 =300nm) crystal seed; Then take by weighing 0.3260g flux by 5% of reactant gross mass, flux is made up of sodium fluoride and boric acid, wherein sodium fluoride 0.165g, boric acid 0.165g; Above-mentioned metal oxide, YAG The seed crystal and the flux are mixed to obtain a mixture;

[0052] 2) adjust the above mixture to rheological phase with ethanol, stir for 24 hours,

[0053] 3) Then heat-preserve and dry in an oven at 120° C. for 6 hours;

[0054] 4) The ...

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Abstract

The invention relates to a preparation method of a YAG (yttrium aluminum garnet): Ce rare earth fluorescent powder, comprising the following steps of: weighing Y2O3 or Gd2O3 or mixture of the Y2O3 and the Gd2O3, Al2O3 or Ga2O3 or mixture of the Al2O3 and the Ga2O3, and CeO3 according to molar ratio as shown in the chemical formula of a target fluorescent powder; weighing a YAG seed crystal and a fluxing agent according to a certain proportion, and mixing the materials; adjusting the mixture into a flowing deformation phase by taking proper amount of water or alcohol or acetic acid, and stirring for 6-24 hours; putting the flowing deformation phase mixture into an oven with the temperature of 80-120 DEG C and insulating for 6-24 hours; putting an obtained product into a high temperature furnace with the temperature of 900-1600 DEG C, and roasting under reducing atmosphere for 2-6 hours; and performing the washing and the impurity removing to a roasted product so as to obtain the YAG: Ce rare earth fluorescent powder. The preparation method has the beneficial effects that the preparation method is low in energy consumption and low in production cost, and the fluorescent powder is even in particle size and regular in shape.

Description

technical field [0001] The invention relates to a phosphor preparation technology, in particular to a method for preparing a YAG:Ce rare earth phosphor. Background technique [0002] Phosphors have important applications in display and lighting fields. YAG:Ce rare earth phosphor is currently the main phosphor for industrial production of white LEDs. YAG is the abbreviation of yttrium aluminum garnet, the chemical formula is Y 3 Al 5 o 12 , by Y 2 o 3 and Al 2 o 3 A composite oxide formed by the reaction, which belongs to the cubic crystal system and has a garnet structure. The production method of white light LEDs is usually to use high-efficiency InGaN / GaN-based blue LEDs to emit blue light to excite YAG:Ce rare earth phosphors, and YAG is excited to emit yellow light and mix with the remaining blue light to form white light. White LED technology is of great significance for rational utilization of energy, alleviation of energy crisis and green lighting. The exist...

Claims

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Application Information

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IPC IPC(8): C09K11/80
Inventor 宋浩亮杨秀芳罗颂科杨力勋秦翰王俊伟
Owner 宁波浩威尔新材料科技有限公司
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