Garnet monocrystal fluorescent material for white light LEDs (light emitting diodes) and preparation method thereof
A fluorescent material and single crystal technology, applied in the field of LED fluorescent materials, to achieve the effects of high excitation and emission efficiency, high thermal conductivity and cost reduction
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[0020] The preparation method of the foregoing oxide single crystal products is a melt single crystal growth method, which mainly includes the following methods: pulling method, descending method, crucible moving method, zone melting method, gradient method, heat exchange method.... The main preparation process is as follows:
[0021] 1. Raw material synthesis
[0022] According to the ratio of oxide single crystal products, use one or more of solid phase reaction, liquid phase reaction, co-precipitation method, semi-dry and semi-wet method, sol combustion method, and citric acid gel method to synthesize oxide single-phase raw materials . Then the powder raw material is pressed into a shape and sintered into a block.
[0023] 2. Crystal growth
[0024] The oxide single crystal is grown by the melt method commonly used in this field. In the special crystal growth program, the crystal growth process is as follows:
[0025] Furnace installation---vacuum---(heating)---filling with prote...
Embodiment 1
[0029] Synthesize oxide crystal growth raw materials by solid-phase reaction method, and use high-purity raw material Al 2 O 3 (99.995%), Y 2 O 3 (99.999%) and CeO 2 (99.99%) Sintering in a muffle furnace air atmosphere for 8-20 hours to remove adsorbed water and other impurities. The sintering temperature is 600-800°C. Then the pre-burned raw materials are accurately weighed according to the equation, a total of 600 grams.
[0030] 5Al 2 O 3 +3(1-x)Y 2 O 3 +6xCeO 2 →2(Y 1-x Ce x ) 3 Al 5 O 12 +6xO 2
[0031] Where x is the mole percentage of Ce atoms in the melt, we take x = 0.3%. The weighed raw materials are ground and mixed in a mortar and blender for more than 10 hours. The uniformly mixed raw materials are pressed into a shape, and then the pressed cake is placed in a corundum crucible in a muffle furnace air atmosphere, sintered at a temperature of 1200-1500°C for about 10-20 hours, and the oxide raw material is synthesized through solid-phase reaction.
[0032] The crystal ...
Embodiment 2
[0035] Synthesize oxide crystal growth raw materials by solid-phase reaction method, and use high-purity raw material Al 2 O 3 (99.99%), Gd 2 O 3 (99.99%), Y 2 O 3 (99.99%) and CeO 2 (99.99%) Sintering in a muffle furnace air atmosphere for 8-20 hours to remove adsorbed water and other impurities. The sintering temperature is 600-800°C. Then the pre-burned raw materials are accurately weighed according to the equation, a total of 600 grams.
[0036] 5Al 2 O 3 +3yGd 2 O 3 +3(1-x-y)Y 2 O 3 +6xCeO 2 →2(Y 1-x-y Gd y Ce x ) 3 Al 5 O 12 +2 / 3xO 2
[0037] Where x is the mole percentage of Ce and y is the mole percentage of Gd, we take x = 0.2% and y = 0.3. The weighed raw materials are ground and mixed in a mortar and blender for more than 10 hours. The uniformly mixed raw materials are pressed into a shape, and then the pressed cake is placed in a corundum crucible in a muffle furnace air atmosphere, sintered at a temperature of 1200-1500°C for about 10-20 hours, and the oxide raw mater...
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