Fluorophosphate-base red fluorescent powder, and preparation method and application thereof
A technology of red fluorescent powder and fluorophosphate, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of inability to realize color reproduction, low luminous efficiency of sulfide, serious environmental pollution, etc., and meet the requirements of low equipment, The effect of low price and simple preparation process
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Embodiment 1
[0033] Preparation of Ca 3 La 0.999 Eu 0.001 f 6 PO 4
[0034] According to the chemical formula Ca 3 La 0.999 Eu 0.001 f 6 PO 4 , respectively weighed lanthanum oxide La 2 o 3 : 1.6275 g, europium oxide Eu 2 o 3 : 0.0018 g, ammonium dihydrogen phosphate NH 4 h 2 PO 4 : 1.1503 grams, ground in an agate mortar and mixed evenly, select the air atmosphere for pre-sintering, the pre-sintering temperature is 400 ° C, the sintering time is 7 hours, then cool to room temperature, take out the sample; Thoroughly mix and grind evenly, carry out the second sintering in the air atmosphere, the sintering temperature is 850°C, the calcination time is 12 hours, then cool to room temperature, take out the sample; finally add excess calcium fluoride CaF to the obtained mixture 2 : After 3.1228 g, it is fully ground again and placed in a muffle furnace, and calcined in an air atmosphere. The calcining temperature is 1100° C., and the calcining time is 14 hours, and the powdery ...
Embodiment 2
[0039] Preparation of Ca 3 La 0.9 Eu 0.1 f 6 PO 4
[0040] According to the chemical formula Ca 3 La 0.9 Eu 0.1 f 6 PO 4 , respectively weighed lanthanum oxide La 2 o 3 : 1.4662 grams, europium nitrate Eu (NO 3 ) 3 -6H 2 O: 0.446 g, ammonium dihydrogen phosphate NH 4 h 2 PO 4 : 1.1503 grams, after grinding and mixing in an agate mortar, select the air atmosphere for pre-sintering, the pre-sintering temperature is 600 ° C, the sintering time is 9 hours, then cool to room temperature, take out the sample; add excess fluorine to the obtained mixture CaF 2 : After 3.1228 g, it is fully ground again and placed in a muffle furnace, and calcined in an air atmosphere at a calcining temperature of 1000° C. and a calcining time of 9 hours to obtain a powdery fluorophosphate red luminescent material. Its main structural properties, excitation spectrum, luminescence spectrum and decay curve are similar to those of Example 1.
Embodiment 3
[0042] Preparation of Ca 3 La 0.8 Eu 0.2 f 6 PO 4
[0043] According to the chemical formula Ca 3 La 0.8 Eu 0.2 f 6 PO 4 , respectively weighed lanthanum oxide La 2 o 3 : 1.30332 grams, europium oxide Eu 2 o 3 : 0.352 g, ammonium dihydrogen phosphate NH 4 h 2 PO 4 : 1.1503 grams, after grinding and mixing in an agate mortar, select the air atmosphere for pre-sintering, the pre-sintering temperature is 600 ° C, the sintering time is 10 hours, then cool to room temperature, take out the sample; add excess fluorine to the obtained mixture CaF 2 : After 3.1228 grams, it is fully ground again and placed in a muffle furnace, and calcined in an air atmosphere at a calcining temperature of 1000° C. and a calcining time of 12 hours to obtain a powdery fluorophosphate red luminescent material. Its main structural properties, excitation spectrum, luminescence spectrum and decay curve are similar to those of Example 1.
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