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 the field of single-matrix white light fluorescent powder and its preparation, can solve the problem of low luminous efficiency, and achieve the effects of uniform particle size, environmental friendliness, and simple operation
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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 raise the temperature to 200°C at a rate of 1°C / min, then raise the temperature to 500°C at a rate of 3°C / min, then raise the temperature to 1000°C at a rate of 5°C / min, keep the temperature 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 th...
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, and 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 the phosphor are distributed in the range of 450nm to 650nm, and the emissio...
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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