Phosphor powder, its preparation method and light-emitting device comprising it
A fluorescent powder and element technology, applied in the field of fluorescent powder, its preparation, and light-emitting devices, can solve the problems of affecting device performance and low relative brightness, and achieve the effects of improving luminous efficiency, low cost, and simple and easy preparation methods
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[0033] Preferably, the above-mentioned preparation method includes the following steps: firstly, the nitrides of alkaline earth metals, Si and Eu are used as raw materials for primary mixing, and the primary mixture is heated at 1500-1800°C, preferably 1600-1700°C, under nitrogen and / or hydrogen atmosphere Medium roasting for 5-20h, preferably 15-20h, to obtain a roasted product; then use Si oxides and / or Al oxides as raw materials for secondary mixing with the roasted product, and heat the secondary mixture at 1500-1700°C, preferably Heat treatment at 1600°C in nitrogen and / or hydrogen atmosphere for 0.5-2h, preferably 1-2h, to obtain the required fluorescent powder; wherein the amount of the above-mentioned raw materials is calculated according to the weight percentage of each element in the fluorescent powder of the present invention Amount, where the amount of nitride of Si matches the amount of oxide of Si so that in the prepared phosphor particles, it is within the range ...
Embodiment 1
[0052] Preparation:
[0053] Weigh 41.67g Sr 3 N 2 , 61.39g Si 3 N 4 and 0.61g of EuN, mixed evenly, and roasted at 1700°C for 15 hours in a mixed atmosphere of nitrogen and hydrogen to obtain a roasted product, lower the temperature below 100°C, take it out, and crush it to obtain roasted particles with an average particle size of 10 μm; The calcined particles were mixed with 0.1 g of SiO 2 Mix, keep warm at 1600°C for 1 hour under a nitrogen atmosphere, lower the temperature below 100°C, take it out, crush it to obtain an average particle size of 10 μm, wash with water, dry and pass through a 450-mesh sieve to obtain the desired fluorescence powder, the mass ratios of Sr element, Si element, N element, O element and Eu element in the phosphor powder to the phosphor powder mass ratio are respectively: 37.7%, 36.8%, 25.1%, 0.1% and 0.4%.
[0054] X-ray diffraction: eg figure 1 As shown, the phosphor is Sr when tested by X-ray diffraction instrument 2 Si 5 N 8 structur...
Embodiment 2-11
[0058] The phosphor powder preparation process in Examples 2-11 is basically the same as in Example 1, except that the alkaline earth metal nitrides, Si 3 N 4 , the amount of EuN is different, and the added SiO 2 and Al 2 o 3 The amount is different, and the amount of each raw material added is shown in Table 1. Through X-ray diffraction, the fluorescent powders prepared in Examples 2-11 in Table 1 are all Sr 2 Si 5 N 8 structure, and detected by the EDS device, the mass ratio and m value of each element in the phosphor powder prepared in Example 2-11 are shown in Table 2.
[0059] The quality of the raw material that adds in the embodiment 2-11 of table 1
[0060] Example Sr 3 N 2
Ca 3 N 2
Ba 3 N 2
Si 3 N 4
EuN SiO 2
2 41.54 0 0 61.40 0.66 0.40 3 41.45 0 0 61.43 0.66 0.60 4 41.29 0 0 61.50 0.66 1.00 5 42.95 0 0 54.02 4.68 0.20 6 49.72 0 0 49.73 0.59 0.70 7 41.35 0....
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