Single-substrate white-light fluorescent powder for white-light LEDs (light-emitting diodes) and preparation method thereof

A fluorescent powder and white light technology, which is applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of low luminous efficiency and achieve the effects of uniform powder particle size, good crystallization performance, 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-substrate white-light fluorescent powder for white-light LEDs (light-emitting diodes) and preparation method thereof
  • Single-substrate white-light fluorescent powder for white-light LEDs (light-emitting diodes) and preparation method thereof
  • Single-substrate white-light fluorescent powder for white-light LEDs (light-emitting diodes) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A single-matrix white light phosphor for white light LEDs and a preparation method thereof, comprising the following steps:

[0029] 1) Weigh Na 2 CO 3 , La 2 o 3 , Mg(NO 3 ) 2 ·6H2 O. WO 3 、Tm 2 o 3 、Dy 2 o 3 and Eu 2 o 3 , and the above raw materials are mixed and ground to obtain a mixed powder;

[0030] 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 1000°C at a rate of 5°C / min, hold for 3 hours, and finally cool with the furnace , to get NaLaMgWO 6 :xTm 3+ ,yDy 3+ , zEu 3+ White light phosphor, where x=0.07, y=0.01, z=0.01.

[0031] see figure 1 ,From figure 1 It can be seen that NaLaMgWO 6 :xTm 3+ ,yDy 3+ , zEu 3+ Powder and NaLaMgWO 6 The standard card JCPDS#37-0243 is completely consistent, and the peak shape is sharp, and the synthesized sample belongs to AA'BB'X 6 Ty...

Embodiment 2

[0033] A single-matrix white light phosphor for white light LEDs and a preparation method thereof, comprising the following steps:

[0034] 1) According to the molar ratio of 0.5:0.5:2:1:x / 2:y / 2:z / 2 (x=0.15, y=0.03, z=0.03), respectively weigh Na 2 CO 3 , La 2 o 3 , Mg(NO 3 ) 2 ·6H 2 O. WO 3 、Tm 2 o 3 、Dy 2 o 3 and Eu 2 o 3 , and the above raw materials are mixed and ground to obtain a mixed powder;

[0035] 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, then to 1100°C at a rate of 7°C / min, hold for 3 hours, and finally cool with the furnace , to get NaLaMgWO 6 :xTm 3+ ,yDy 3+ , zEu 3+ White light phosphor, where x=0.15, y=0.03, z=0.03.

[0036] see figure 2 ,From figure 2 It can be seen that the emission bands of phosphor powder are distributed in the range of 450nm to 650nm, and the emission...

Embodiment 3

[0038] A single-matrix white light phosphor for white light LEDs and a preparation method thereof, comprising the following steps:

[0039] 1) According to the molar ratio of 1:2:0.5:1:x / 2:y / 2:z / 2 (x=0.2, y=0.05, z=0.05), respectively weigh Na 2 CO 3 , La 2 o 3 , Mg(NO 3 ) 2 ·6H 2 O. WO 3 、Tm 2 o 3 、Dy 2 o 3 and Eu 2 o 3 , and the above raw materials are mixed and ground to obtain a mixed powder;

[0040] 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, and then to 1100°C at a rate of 5°C / min, hold for 5 hours, and finally cool with the furnace , to get NaLaMgWO 6 :xTm 3+ ,yDy 3+ , zEu 3+ White light phosphor, where x=0.2, y=0.05, z=0.05.

[0041] see image 3 ,From image 3 It can be seen that NaLaMgWO 6 :xTm 3+ ,yDy 3+ , zEu 3+ The phosphor powder emits white light under the excitation of ne...

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Abstract

The invention discloses a single-substrate white-light fluorescent powder for white-light LEDs (light-emitting diodes) and a preparation method thereof, belonging to the technical field of preparation of LED fluorescent powder. The composition expression of the white-light fluorescent powder is NaLaMgWO6:xTm<3+>,yDy<3+>,zEu<3+>, wherein x=0.07-0.2, y=0.01-0.07, and z=0.01-0.07. The preparation method comprises the following steps: 1) mixing Na2CO3, La2O3, Mg(NO3)2.6H2O, WO3, Tm2O3, Dy2O3 and Eu2O3 in a mole ratio of (0.5-2):(0.5-2):(0.5-2):1:x / 2:y / 2:z / 2, and grinding uniformly to obtain a powder mixture; and 2) carrying out solid-phase sintering on the powder mixture in a weakly reducing atmosphere to obtain the white-light fluorescent powder. The method is simple to operate, has the advantages of low facility request and environment friendliness, and is suitable for industrialized large-scale production.

Description

technical field [0001] The invention belongs to the technical field of LED phosphor preparation, and in particular relates to a single-matrix white phosphor used for 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 reprod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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