Europium-activated silicate blue-light fluorescent powder and preparation method thereof
A phosphor and silicate technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of poor color reproduction of white light LEDs and low white light color rendering index, and achieve high color rendering index, high luminous efficiency, and brightness. small change effect
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Embodiment 1
[0019] According to the chemical formula Na 2 wxya 2 o 7 :0.03Eu 2+ The stoichiometric ratio weighs Na 2 CO 3 , HfO 2 , SiO 2 and Eu 2 o 3 , fully mixed and ground to obtain the mixture; put the mixture in an alumina crucible, put it in a tube furnace, under a protective atmosphere, keep it at 1350°C for 4 hours, cool to room temperature with the furnace, grind, and sieve to obtain Europium activated silicate blue phosphor. The protective atmosphere consists of 10% H by volume 2 and 90% N 2 composition.
[0020] figure 1 It is the X-ray diffraction spectrum figure of the blue fluorescent powder that embodiment 1 makes, as can be seen from the figure from figure 1 It can be seen that the X-ray diffraction peaks of the obtained product match well with the standard card. It shows that the sample has a good crystal structure.
[0021] The excitation and emission spectrograms of the blue fluorescent powder that embodiment 1 makes, as figure 2 . from figure 2 It ...
Embodiment 2
[0024] According to the chemical formula Na 2 f 0.8 Zr 0.2 Si 2 o 7 :0.01Eu 2+ The stoichiometric ratio weighs Na 2 CO 3 , HfO 2 , SiO 2 and Eu 2 o 3 , fully mixed and ground to obtain the mixture; put the mixture in an alumina crucible, put it in a tube furnace, under a protective atmosphere, keep it at 1300 ° C for 8 hours, cool to room temperature with the furnace, grind, and sieve to obtain Europium activated silicate blue phosphor. The protective atmosphere consists of 5% H by volume 2 And 95% He composition.
[0025] The excitation and emission spectrograms of the fluorescent powder that embodiment 2 makes, as Figure 4 . from Figure 4 It can be seen that the wavelength of the excitation light of the phosphor is between 250nm and 450nm, and the main wavelength of the emission light is at 460nm. Figure 4 It shows that the phosphor has a wide excitation band, which can fit well with the near-ultraviolet chip.
[0026] from figure 2 with Figure 4 It c...
Embodiment 3
[0028] According to the chemical formula Na 2 f 0.9 Zr 0.1 Si 2 o 7 :0.01Eu 2+ The stoichiometric ratio weighs Na 2 CO 3 , HfO 2 , SiO 2 and Eu 2 o 3 , fully mixed and ground to obtain the mixture; put the mixture in an alumina crucible, put it in a tube furnace, and under a protective atmosphere, keep it at 1400°C for 6 hours, cool to room temperature with the furnace, grind, and sieve to obtain Europium activated silicate blue phosphor. The protective atmosphere consists of 7.5% H by volume 2And 92.5% He composition.
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