How to Synthesize CsPbBr3/Cs4PbBr6 Nanocrystals

First, we need the following chemicals:

Hydro Bromic Acid (HBr, 48wt% in H2O)

Lead Bromide (PbBr2, 98%)

Oleic Acid (OA, 89-95%)

Dimethylformamide (DMF, 99.9%)

Toluene (99.9%)

Oleylamine (OLA, 98%)

Cesium Carbonate (Cs2CO3, 99%)

n-hexane (C6H14, 98%)

Second, use the following instructions to synthesize the NCs:

In the first step, 10.75 ml OA and 1.125 g Cs2CO3 should be mixed at 130℃ under a vacuum in a glove box for approximately 1 hour until the mixture turns into a clear yellowish stock of Cs-Oleate precursor. Secondly, 5.5 mg PbBr2 should be dissolved in 500 µl DMF and stirred for 5 minutes at 50 ℃. Then, 8 µl HBr, 50 µl OA, and 25 µl OLA should be added to the PbBr2 and DMF solution. The final step should be performed while nitrogen gas is purging into the glove box in which 2.5 ml OA, 5 ml n-hexane, and 100 µl Cs-Oleate precursor should be added to a beaker at 125 ℃. afterward, the prepared solution in the previous step (DMF + PbBr2 + HBr + OA + OLA) should be swiftly injected into the beaker and vigorously stir for about 15 minutes until the color change from pale white to yellow observed, which indicates the formation of CsPbBr3/Cs4PbBr6 Perovskite Nanocrystals. Then, the resulting solution should be centrifuged for 3 minutes at 7000 rpm to separate NCs. The separated NCs can be poured into 1 ml of Toluene for further characterizations.

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