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
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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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