Method for preparing high-stability CsPbBr3 quantum dots by solvent-free and ligand-free ball milling method
A high-stability, ligand-free technology, applied in chemical instruments and methods, luminescent materials, nanotechnology, etc., can solve the problems of difficult product separation, cumbersome preparation process, poor product stability, etc., and achieve simple process and environmental stability. Strong, no attenuation effect of emission intensity
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Embodiment 1
[0030] In this embodiment, cesium bromide, lead bromide, and potassium bromide are used as the perovskite source, and the molar ratio is 1:1:3. The perovskite source is mixed with the PMMA polymer material. 1.5% of the total mass of polymer materials. Put the mixture into a 100mL ball mill jar, add 2mm, 4mm and 8mm combined zirconia balls, and mill them in a planetary ball mill at the speeds of 360r / min, 500r / min, and 630r / min, respectively. After 1 hour of ball milling, you get CbBr 3 PQDs / PMMA luminescent material.
[0031] Separate and sieve the luminescent material from the grinding ball, and measure the fluorescence spectrum, such as figure 1 shown. From figure 1 It can be seen that the fluorescence intensity is the highest when the milling speed is 500r / min.
Embodiment 2
[0033] In this embodiment, "cesium bromide+lead bromide+potassium bromide", "cesium stearate+lead bromide+potassium bromide", "cesium stearate+lead stearate+potassium bromide", Several combinations of "cesium carbonate + lead bromide + potassium bromide" are used as perovskite sources. Wherein the molar ratio of Cs source, Pb source, Br source and the quality of perovskite source are the same as that of Example 1, that is, the molar ratio of Cs source, Pb source and Br source is 1:1:3, and the quality of perovskite source accounts for 1.5% of the total mass ; The ball milling speed of the present embodiment is 500r / min, and the ball milling time is 1 hour. Finally get CsPbBr 3 PQDs / PMMA luminescent material.
[0034] Separate and sieve the luminescent material from the grinding ball, measure the fluorescence spectrum, see figure 2 . Such as figure 2 As shown, CsPbBr with the combination of "cesium stearate + lead bromide + potassium bromide" as the source of perovskite...
Embodiment 3
[0036] In this embodiment, cesium stearate, lead bromide, and potassium bromide are used as perovskite sources, and the molar ratio of cesium stearate, lead bromide, and potassium bromide is 1:1:3. The molecular materials are mixed, and the mass of the perovskite source is controlled to account for 0.5%, 0.75%, 1.0%, and 1.25% of the total mass. Put the mixture into a 100mL ball mill jar, add 2mm, 4mm and 8mm combined zirconia balls, and mill in a planetary ball mill with a milling speed of 500r / min. After milling for 1 hour, CsPbBr was obtained. 3 PQDs / PMMA luminescent material.
[0037] Separate and sieve the luminescent material from the grinding ball, measure the fluorescence spectrum image 3 shown. From image 3 It can be seen that with the increase of the mass of the perovskite source, the intensity of the fluorescence spectrum increases first, then decreases, and reaches the maximum when the mass of the perovskite source is 0.75%.
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