Defect-based up-conversion fluorescent lead-free ferroelectric material and its preparation method and application
A ferroelectric material and fluorescence technology, applied in the field of ferroelectric materials to achieve the effect of reducing production costs
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Embodiment 1
[0041] Embodiment 1, adopts the Na of purity 99.8% 2 CO 3 , 99.9% Bi 2 o 3 ,99.8% TiO 2 and 99.9% Yb 2 o 3 As raw material, according to the chemical formula Bi 0.47 Na 0.5 Yb 0.03 TiO 3 (BNT:0.03Yb) was weighed separately, put into a ball mill tank and mixed ball mill, ball mill conditions: the volume ratio of raw material, agate ball volume, and ball mill medium anhydrous ethanol is approximately equal to 1:1:1.5. Ball milled for 12 hours, and the raw materials after ball milling were put into an oven and baked at 80° C. for 4 hours.
[0042] The raw material after drying is pressed into a raw material body with a diameter of 40mm by a tablet press at 20Mpa, and then the pressed body is put into a KBF1400 box furnace (produced by Nanjing Nanda Instrument Co., Ltd.) for pre-burning. Conditions were 850°C for 2 hours.
[0043] Afterwards, the pre-fired block sample was crushed, ground into powder, sieved, ball milled for 12 hours, and then put into an oven at 80° C....
Embodiment 2
[0049] Embodiment 2, adopt the Ca of purity 99.95% 2 CO 3 ,99.95% BaCO 3 ,99.8% TiO 2 , and 99.9% of Yb 2 o 3 As the raw material according to the chemical formula Ca 0.77 Ba 0.23 Ti 0.97 Yb 0.03 o 3 (CBT:0.03Yb) were weighed separately. Similar to the steps in Example 1, the pre-firing condition is 1100° C. for 3 hours, and the sintering condition is 1350° C. for 3 hours to prepare CBT:0.03Yb lead-free ferroelectric upconversion fluorescent ceramics.
[0050] figure 1 shows the upconversion luminescence map of CBT:0.03Yb, from figure 1 It can be seen that the up-conversion luminescence peaks are mainly blue light at 479nm, green light at 545nm, red light at 651nm and infrared light at 796nm. In addition, apply an electric field of 4-5kV / mm to the ceramic for polarization, and test the upconversion fluorescence after polarization, such as image 3 As shown, the up-conversion fluorescence spectrum changes, and after polarization, a strong 576nm green light appears....
Embodiment 3
[0051] Embodiment 3, adopt the BaCO of purity 99.95% 3 ,99.8% TiO 2 , and 99.9% of Yb 2 o 3 As the raw material according to the chemical formula BaTi 1-x Yb x o 3The metering ratio of (BT:xYb) is weighed separately. Similar to the steps in Example 1, the pre-firing condition is 1200° C. for 5 hours, and the sintering condition is 1450° C. for 6 hours to prepare BT:xYb lead-free ferroelectric upconversion fluorescent ceramics. attached figure 1 And attached Figure 4 shows the upconversion luminescence map of BT:xYb, from figure 1 It can be seen that the up-conversion luminescence peaks are mainly blue light at 480nm, green light at 548nm, red light at 653nm, and infrared light at 776nm and 800nm. from Figure 4 It can be seen that when x is set to be 0.02, 0.03, 0.04 and 0.05 respectively, the content of Yb has no particularly obvious effect on the up-conversion luminescence of defects.
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