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Alkaline earth halogen silicate phosphor powder and preparation method thereof

A technology of halosilicate and phosphor, which is applied in the field of alkaline earth halosilicate phosphor and its preparation, can solve the problems of poor optical performance consistency of white light LED devices, increase the powder mixing process, etc., and achieve easy operation and simple preparation method Effect

Inactive Publication Date: 2008-01-09
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the LED packaging process, it is necessary to mix red, blue and green phosphors in a certain proportion first, and then mix them with the encapsulant. This process not only increases the powder mixing process, but also leads to poor optical performance consistency of white LED devices.

Method used

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  • Alkaline earth halogen silicate phosphor powder and preparation method thereof
  • Alkaline earth halogen silicate phosphor powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: 2 (Ca 0.51 Sr 0.4 )O·0.8Ca(F 0.07 Cl 0.93 ) 2 ·SiO2 2 : Preparation of 0.03Eu·0.15Mn Phosphor Powder

[0024] Weigh calcium carbonate (CaCO 3 ) 2.0418g, silicon dioxide (SiO 2 ) 1.2017g, europium trioxide (Eu 2 o 3 ) 0.1056g, anhydrous calcium chloride (CaCl 2 ) 1.6514g, manganese carbonate (MnCO 3 ) 0.3448g, strontium oxalate (Sr(CH 3 COO) 2 0.5H 2 O) 3.4355g, calcium fluoride (CaF 2 ) 0.0874g, flux lithium carbonate (Li 2 CO 3 ) 0.7981g, after grinding and mixing the above raw materials in an agate mortar, put them into a corundum crucible, first burn them at 600°C for 2 hours, then take them out and grind them, then put them into a corundum crucible, and pass through the corundum crucible before heating Inject high-purity nitrogen to drive out the air in the quartz tube, and then burn it at 800°C for 6 hours under a carbon monoxide atmosphere. After cooling, grind it evenly, then crush it and sieve it, and wash it with water and ethanol ...

Embodiment 2

[0025] Embodiment 2: 2 (Ca 0.8945 Sr 0.1 )O·CaCl 2 ·SiO2 2 : Preparation of 0.01Eu·0.001Mn Phosphor Powder

[0026] Weigh calcium carbonate (CaCO 3 ) 3.5811g, silicon dioxide (SiO 2 ) 1.2017g, europium trioxide (Eu 2 o 3 ) 0.0352g, anhydrous calcium chloride (CaCl 2 ) 2.2197g, manganese carbonate (MnCO 3 ) 0.0023g, strontium oxalate (Sr(CH 3 COO) 2 0.5H 2 (2) 0.8589g, fluxing agent ammonium chloride 0.3160g, after the above-mentioned raw materials are ground and mixed in the agate mortar, put into the corundum crucible, first burn in advance at 600 ℃ in air for 2 hours, then after grinding, repack Put it into a corundum crucible. Before heating, inject high-purity nitrogen to drive out the air in the quartz tube, and then burn it in an ammonia atmosphere at 800°C for 3 hours. Wash and finally get the sample. The sample is excited under 400nm ultraviolet light or 460nm blue light, which mainly emits yellow-green light. The room temperature excitation and emission ...

Embodiment 3

[0027] Embodiment 3: 2 (Ca 0.625 Sr 0.3 )O·1.2Ca(F 0.05 Cl 0.95 ) 2 ·SiO2 2 : Preparation of 0.05Eu·0.1Mn Phosphor Powder

[0028] Weigh calcium carbonate (CaCO 3 ) 2 .5022g, silicon dioxide (SiO 2 ) 1.2017g, europium trioxide (Eu 2 o 3 ) 0.1760g, anhydrous calcium chloride (CaCl 2 ) 2.5304g, manganese carbonate (MnCO 3 )0.2299g, strontium oxalate (Sr(CH 3 COO) 2 0.5H 2 O) 2.5766g, calcium fluoride (CaF 2) 0.0937g, flux ammonium fluoride 0.0047g, after grinding and mixing the above raw materials in an agate mortar, put them into a corundum crucible, pre-fire in the air at 500°C for 4 hours, then grind them, and then put them into In the corundum crucible, before heating, inject high-purity nitrogen gas to drive out the air in the quartz tube, and then burn it in a carbon monoxide atmosphere at 700°C for 7 hours. After cooling, grind it evenly, then crush it and sieve it, and wash it with water and ethanol respectively. Finally got the sample. The sample is exc...

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Abstract

An alkaline halogen silicate fluorescent powder and its production are disclosed. The general formula is 2(Ca1-x-0.5z-0.5nSrx)0.mCa(FyCl1-y)2.SiO2:zEu.nMn; n=0, x is not greater than 0.45 or not less than 0; y is not greater than 0.1 or not less than 0.001, m is not greater than 1.7 or not less than 0.8, z is not greater than 0.18 or not less than 0.003; when n is not greater than 0.30 or greater than 0, x is not greater than 0.45 or not less than 0, y is not greater than 0.1 or not less than 0, m is not greater than 1.7 or not less than 0.8, z is not greater than 0.18 or not less than 0.003. The process is carried out by weighing materials proportionally, mixing and grinding for oxides and salts in elements, sintering at 500-700 deg. C for 1-4 hrs under air atmosphere, sintering at 700-1000 deg. C for 1-7 hrs under reducing atmosphere, cooling, crushing, screening, washing by alcohol and water and drying. It has strong absorbing performance between 250-470 nm wavelength, transmitting main peak is located between 505-605 nm. It has adjusting wavelength and can be excited effectively by violet light and blue light LED chip.

Description

technical field [0001] The invention relates to the field of luminescent materials for purple and blue LEDs, in particular to an alkaline earth halosilicate fluorescent powder that can be excited by purple and blue LEDs and a preparation method thereof. Background technique [0002] Light Emitting Diode (LED) is also known as solid light source. Compared with traditional lighting sources (incandescent lamps and fluorescent lamps), it has unique advantages such as energy saving, long life, and no mercury pollution. It is considered to be the mainstream of new light sources in the 21st century. . Phosphor conversion white light diode (W-LED) semiconductor lighting technology is one of the important lighting technologies at present. According to the chip type, there are two main white light technology solutions: blue LED + yellow phosphor (or + green / red phosphor) and purple light LED + red / green / blue three-primary color phosphor. Violet LED + red / green / blue tricolor phosphor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79H01L33/00H01L33/50
Inventor 王静刘宗淼丁唯嘉苏锵
Owner SUN YAT SEN UNIV
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