Gallium aluminate fluorescent powder and preparation method thereof
A phosphor and aluminate technology, applied in chemical instruments and methods, luminescent materials, gallium/indium/thallium compounds, etc., can solve the problems of unsuitability for industrial production, poor high temperature stability, complicated operation, etc., and it is easy to achieve process conditions. Control, good thermal stability, simple operation effect
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Embodiment 1
[0021] According to the general chemical formula Y 1.38 Ce 0.12 Lu 1.5 al 2.7 Ga 1.7 Si 0.3 Ba 0.3 o 12 The stoichiometric ratio of each element in the formula weighs the oxides of each element respectively, puts the weighed raw materials into a three-dimensional mixer and mixes them for 1 hour. After mixing evenly, add 6% of the total mass of raw materials into the three-dimensional mixer 2 and 2% NaCl, and then mixed again for 2h; put the uniformly mixed mixture into a corundum crucible, raise the temperature to 1400°C under reducing atmosphere (mixed gas of nitrogen and hydrogen) and keep it warm for 1.5h, then lower to room temperature to obtain Sintered product; the sintered product is taken out, after ball milling, pickling with 5% dilute hydrochloric acid, and drying, the general formula is Y 1.38 Ce 0.12 Lu 1.5 al 2.7 Ga 1.7 Si 0.3 Ba 0.3 o 12 galloaluminate phosphors. Characterize the obtained product, the results are as follows: figure 1 shown.
[00...
Embodiment 2-7
[0026] The sintering temperature and holding time during the phosphor powder preparation process were changed (see Table 1 for details), and other raw materials and processes were the same as in Example 1. The relative brightness of the prepared phosphor powder was tested, and the results are shown in Table 1.
[0027] Table 1:
[0028]
[0029]
[0030]It can be seen from Table 1 that as the sintering temperature increases, the relative brightness of the phosphor increases. After 1400 ° C, the relative brightness does not change significantly with the sintering temperature; The relative brightness increases gradually. When the holding time is 1.5h, the relative brightness of the fluorescent powder is the highest. Within the value range, the relative brightness of the fluorescent powder is generally better than that of reference example 1, and the operation steps and the holding time of the present invention are compared with the reference example 1. Proportion 1 has the...
Embodiment 8-11
[0032] Change the add-on of fluxing agent in phosphor powder preparation process (specifically see table 2), BaCl in fluxing agent 2 The ratio to NaCl, other raw materials and processes are the same as in Example 1, and the relative brightness of the prepared phosphor is tested, and the results are shown in Table 2.
[0033] Table 2:
[0034] Example Flux amount / total mass of raw materials relative brightness Reference example 1 -- 100 Example 1 8％ 110.3 Example 8 1％ 100.5 Example 9 4％ 103.6 Example 10 12％ 107.9 Example 11 15％ 107.1
[0035] It can be seen from Table 2 that with the increase of the amount of flux, the relative brightness of the phosphor increases first and then decreases. 2 : NaCl=6%: when 2%, the relative brightness reaches the highest, and within the value range, the relative brightness of phosphor powder is generally better than that of reference example 1. Examples 12-15
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