A mn4+-activated heptafluorohafnate red luminescent material and its preparation method
A technology of heptafluorohafnate and red light emission, which is applied in the direction of light-emitting materials, chemical instruments and methods, and can solve the problems of lack of red components, low color rendering index, and high color temperature of white LEDs
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Embodiment 1
[0013] Weigh 0.202 g and HfO 2 Dissolve in 10ml hydrofluoric acid (40wt%), stir at room temperature for 30 minutes until completely dissolved, add 0.062g potassium hexafluoromanganate to this solution and react for 30 minutes; then add 0.406g potassium fluoride solid and continue stirring for 60 minutes. The resulting precipitate was washed 3 times with anhydrous acetic acid and anhydrous methanol, and finally dried in a vacuum oven for 24 hours. The orange-red powder obtained was the final product K 3 Hf 7 :Mn 4+ .
[0014] The XRD diffraction pattern of this fluorescent powder is attached figure 1 As shown, the diffraction peak of the sample is consistent with the standard card JCPDS 78-1827 (K 3 Hf 7 ) are completely consistent, and no diffraction peaks of any heterogeneous phases are observed, which indicates that our synthesized samples have a single crystal phase.
[0015] attached figure 2 Shown are the room temperature excitation spectrum (monitored at 628 nm) ...
Embodiment 2
[0017] Weigh 0.202 g and HfO 2 Dissolve in 5ml of hydrofluoric acid (40wt%), stir in a water bath at 60°C for 20 minutes until completely dissolved, add 0.062g of potassium hexafluoromanganate to the solution and react for 30 minutes; then add 0.174g of potassium fluoride solid to continue Stir for 30 min. The resulting precipitate was washed 3 times with anhydrous acetic acid and anhydrous methanol, and finally dried in a vacuum oven for 24 hours. The orange-red powder obtained was the final product K 3 Hf 7 :Mn 4+ .
Embodiment 3
[0019] Weigh 0.202 g and HfO 2 Dissolve in 20ml of hydrofluoric acid (40wt%), stir in a water bath at 40°C for 20 minutes until completely dissolved, add 0.062g of potassium hexafluoromanganate to the solution and react for 30 minutes; then add 0.590g of potassium carbonate solid and continue stirring 60 min. The resulting precipitate was washed 3 times with anhydrous acetic acid and anhydrous methanol, and finally dried in a vacuum oven for 24 hours. The orange-red powder obtained was the final product K 3 Hf 7 :Mn 4+ .
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