Single-host white-light emitting fluorophosphate fluorescent powder for white-light LED and preparation method of fluorophosphate fluorescent powder
A fluorophosphate, single-matrix technology, applied in the field of rare earth luminescent materials, can solve the problem of lack of single-matrix white light phosphors, and achieve the effects of good chemical stability and thermal stability, low sintering temperature, and cheap raw materials
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Embodiment 1
[0023] According to the chemical formula Ba 2.999 GdNa(PO 4 ) 3 F: 0.001Eu 2+ Weigh the raw material BaCO 3 , NH 4 h 2 PO 4 、Gd 2 o 3 , NaF and Eu 2 o 3 , the molar ratio between them corresponds to 2.999:3:0.5:1:0.0005. After the raw materials are fully ground and mixed evenly, they are placed in a corundum crucible, and then placed in a high-temperature furnace and roasted at 1250°C for 7 hours under a CO atmosphere. , and then cooled to room temperature to obtain a fluorophosphate single-matrix white light phosphor.
[0024] From figure 1 It can be seen from the figure that the excitation spectrum of the phosphor powder in this embodiment is a broad spectrum, covering the ultraviolet, purple and blue light regions, the excitation peak is located near 400nm, and the spectral peak is high, indicating that the phosphor powder of this embodiment can be effectively excited by the purple light chip . When the excitation wavelength of the emission spectrum is 400nm, f...
Embodiment 2
[0026] According to Ba 2.995 GdNa(PO 4 ) 3 F: 0.005Eu 2+ Weigh BaCO 3 , NH 4 h 2 PO 4 、Gd 2 o 3 , NaF and Eu 2 o 3 The molar ratio between them is 2.995:3:0.5:1:0.0025. After fully grinding and mixing, place it in a corundum crucible, then put it into a high-temperature furnace and bake it at 1280°C for 5 hours in a CO atmosphere, and then cool it to room temperature. , to obtain fluorophosphate single-matrix white light phosphor.
[0027] The excitation spectrum of the phosphor in this embodiment is a broad spectrum, covering the ultraviolet, violet and blue light regions, the excitation peak is located near 400nm, and the spectral peak is high, indicating that the phosphor in this embodiment can be effectively excited by the violet chip. When the excitation wavelength of the emission spectrum is 400nm, the emission of the phosphor powder in this embodiment is the broadband emission of divalent europium, and there are two emission peaks, which are respectively loca...
Embodiment 3
[0029] According to Ba 2.99 GdNa(PO 4 ) 3 F: 0.01Eu 2+ Weigh BaCO 3 , NH 4 h 2 PO 4 、Gd 2 o 3 , NaF and Eu 2 o 3 , the molar ratio between them is 2.99:3:0.5:1:0.005. After fully grinding and mixing evenly, place it in a corundum crucible, then put it into a high-temperature furnace and bake it at 1300°C for 4 hours under a nitrogen-hydrogen mixture atmosphere. Cool to room temperature to obtain fluorophosphate single-matrix white light phosphor.
[0030] The excitation spectrum of the phosphor in this embodiment is a broad spectrum, covering the ultraviolet, violet and blue light regions, the excitation peak is located near 400nm, and the spectral peak is high, indicating that the phosphor in this embodiment can be effectively excited by the violet chip. When the excitation wavelength of the emission spectrum is 400nm, the emission of the phosphor powder in this embodiment is the broadband emission of divalent europium, and there are two emission peaks, which are r...
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