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Single-matrix white fluorescent powder for warm white LED (Light Emitting Diode) and preparation method thereof

A fluorescent powder and warm white light technology, applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of low luminous efficiency and achieve the effect of simple operation, low cost and low equipment requirements

Inactive Publication Date: 2015-06-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, materials synthesized by wet chemical methods such as sol-gel method, spray pyrolysis method, and hydrothermal synthesis method have more heterogeneous phases and lower luminous efficiency.

Method used

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  • Single-matrix white fluorescent powder for warm white LED (Light Emitting Diode) and preparation method thereof
  • Single-matrix white fluorescent powder for warm white LED (Light Emitting Diode) and preparation method thereof
  • Single-matrix white fluorescent powder for warm white LED (Light Emitting Diode) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method for warm white fluorescent powder for LED, comprising the following steps:

[0030] 1) According to the molar ratio of 0.5:0.5:1:1:x / 2:y / 4:z / 2 (x=0.15, y=0.05, z=0.0025), respectively weigh Na 2 CO 3 , La 2 o 3 , Mg(NO 3 ) 2 ·6H 2 O. WO 3 、Tm 2 o 3 , Tb 4 o 7 and Sm 2 o 3 , and the above raw materials are mixed and ground to obtain a mixed powder;

[0031] 2) Put the mixed powder in an alumina crucible and sinter in a resistance furnace. The sintering system in the resistance furnace is to heat up to 200°C at a rate of 1°C / min, then to 500°C at a rate of 3°C / min, then to 1100°C at a rate of 5°C / min, hold for 3 hours, and finally cool with the furnace , to get NaLaMgWO 6 :xTm 3+ , yTb 3+ , zSm 3+ White light phosphor, where x=0.15, y=0.05, z=0.0025.

[0032] see figure 1 ,From figure 1 It can be seen that NaLaMgWO 6 :xTm 3+ , yTb 3+ , zSm 3+ Powder and NaLaMgWO 6 The standard card JCPDS#37-0243 is completely consistent, and th...

Embodiment 2

[0034] A preparation method of white phosphor powder for LED, comprising the following steps:

[0035] 1) Weigh Na 2 CO 3 , La 2 o 3 , Mg(NO 3 ) 2 ·6H 2 O. WO 3 、Tm 2 o 3 , Tb 4 o 7 and Sm 2 o 3 , and the above raw materials are mixed and ground to obtain a mixed powder;

[0036] 2) Put the mixed powder in an alumina crucible and sinter in a resistance furnace. The sintering system in the resistance furnace is to heat up to 100°C at a rate of 1°C / min, then to 300°C at a rate of 2°C / min, and then to 1000°C at a rate of 7°C / min, hold for 5 hours, and finally cool with the furnace , to get NaLaMgWO 6 :xTm 3+ , yTb 3+ , zSm 3+ White light phosphor, where x=0.25, y=0.01, z=0.01.

[0037] see figure 2 ,From figure 2 It can be seen that the emission band of the phosphor is distributed in the range of 450nm to 670nm, and the emission spectrum is mainly composed of four strong emission peaks, which are at 480nm, 545nm, 600nm, and 645nm respectively. Among them, 4...

Embodiment 3

[0039] A preparation method of white phosphor powder for LED, comprising the following steps:

[0040] 1) Weigh Na 2 CO 3 , La 2 o 3 , Mg(NO 3 ) 2 ·6H 2 O. WO 3 、Tm 2 o 3 , Tb 4 o 7 and Sm 2 o 3 , and the above raw materials are mixed and ground to obtain a mixed powder;

[0041] 2) Put the mixed powder in an alumina crucible and sinter in a resistance furnace. The sintering system in the resistance furnace is to heat up to 300°C at a rate of 3°C / min, then to 600°C at a rate of 4°C / min, then to 1200°C at a rate of 5°C / min, hold for 3 hours, and finally cool with the furnace , to get NaLaMgWO 6 :xTm 3+ , yTb 3+ , zSm 3+ White light phosphor, where x=0.05, y=0.01, z=0.0025.

[0042] see image 3 ,From image 3 It can be seen that the emission band of the phosphor is distributed in the range of 450nm to 670nm, and the emission spectrum is mainly composed of four strong emission peaks, which are at 480nm, 545nm, 600nm, and 645nm respectively. Among them, 480nm...

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Abstract

The invention discloses a single-matrix white fluorescent powder for a warm white LED (Light Emitting Diode) and a preparation method thereof and belongs to the technical field of preparation of LED fluorescent powder. A composition expression formula of the white fluorescent powder is NaLaMgWO6:xTm<3+>, yTb<3+>, zSm<3+>, wherein x is equal to 0.05-0.25, y is equal to 0.01-0.1 and z is equal to 0.0025-0.05. The preparation method comprises the following steps: (1) respectively weighing Na2CO3, La2O3, Mg(NO3)2*6H2O, WO3, Tm2O3, Tb4O7 and Sm2O3 according to ratios; mixing and uniformly grinding to obtain mixed powder; and (2) carrying out solid-phase sintering on the mixed powder to obtain the single-matrix white fluorescent powder NaLaMgWO6:xTm<3+>, yTb<3+>, zSm<3+> for the warm white LED. The method is simple to operate, low in equipment requirements and environmental friendly, and is suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of LED phosphor preparation, and relates to a single-matrix white phosphor for warm white LEDs and a preparation method thereof. Background technique [0002] White LED (Light Emitting Diode) has many characteristics such as non-toxic, high efficiency and energy saving, long life, all solid state, low working voltage, shock resistance and good safety. It has replaced the existing incandescent and fluorescent lamps and become a new generation of lighting sources. It is widely used in lighting and display fields. [0003] At present, there are mainly two schemes for the realization of commercial white light LEDs. One is that the blue chip excites the yellow phosphor, and the remaining blue light and yellow light combine to emit white light. However, the luminous color of the device varies with the driving voltage and the phosphor coating thickness. It changes from time to time, poor color reproduction, low co...

Claims

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Application Information

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IPC IPC(8): C09K11/78
CPCY02B20/00
Inventor 宁青菊李向龙代旭飞胡昌志刘斐董成思常方
Owner SHAANXI UNIV OF SCI & TECH
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