Red fluorescent powder used for LED (light-emitting diode) and preparation method thereof
A red phosphor, phosphor technology, applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of poor color rendering, low efficiency, unstable performance, etc., and achieve stable physical and chemical properties , the effect of high energy conversion efficiency and simple synthesis method
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Embodiment 1
[0021] Embodiment 1: Weighing SrCO 3 9.9905g, GeO 2 2.5278g, Li 2 CO 3 0.0893g, Eu 2 o 3 0.4252g, the above raw materials are all analytically pure. After the weighed raw materials are mixed and ground evenly, they are put into an alumina crucible and roasted in the air, and kept at 1100°C for 3 hours. After cooling, take it out and crush it, grind it, wash it with water to remove impurities, and dry it to get the chemical composition of Sr 2.8 Li 0.1 GeO 5 : 0.1Eu 3+ The sample, its emission spectrum see Figure 1~Figure 4 . The main emission peak is 616 nm. Its excitation spectrum see Figure 5 . It can be seen from the figure that the phosphor can be effectively excited by ultraviolet, purple or blue light in the range of 300 nm to 480 nm, and has a wide range of uses.
Embodiment 2
[0022] Embodiment 2: Weigh Sr(NO 3 ) 2 11.6303g, GeO 2 3.3811g, Li 2 C 2 o 4 0.247g, Eu 2 o 3 0.8531g, and NH 4 Cl 0.1g, the above raw materials are all analytically pure. After the weighed raw materials are mixed and ground evenly, they are put into an alumina crucible and roasted in the air, and kept at 1100°C for 3 hours. After cooling, take it out and crush it, grind it, wash it with water to remove impurities, and dry it to get the chemical composition of Sr 1.7 Li 0.15 GeO 4 : 0.15Eu 3+ sample.
Embodiment 3
[0023] Embodiment 3: Weighing SrC 2 o 4 7.6229g, Ge(CO 3 ) 2 9.2859g, Li 2 CO 3 0.0891g, Eu(NO 3 ) 3 0.8148g, the above raw materials are all analytically pure. After mixing and grinding the weighed raw materials evenly, put them into an alumina crucible and roast them twice in the air. Secondary roasting, heat preservation at 1050°C for 3 hours. After cooling, take it out and crush it, grind it, wash it with water to remove impurities, and dry it to get the chemical composition of Sr 0.9 Li 0.05 GeO 3 : 0.05Eu 3+ sample.
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