Synthesis of MLA•Cs•QD4 (2). To 15 mg of PbBr2, 8.7 mg of CsBr and DMF (1 mL) were added to form a 40 µmol/mL solution (Cs:Pb = 1:1). 1 equiv of MLA (5.4 mg) was added to the solution and the mixture was stirred for 45 minutes at rt to give a clear solution. OAM (30 µL, 2.3 equiv) was added to the clear solution and a thick white precipitate formed. Then, the solution was sonicated until it became a homogenously white suspension (15~20 minutes). The resulting white precursor solution was slowly (one droplet every 6 seconds, 250 µL in total) added to 8 mL of toluene under vigorous stirring. The solution was then let to stir for 50 minutes at rt under ambient (20 °C / 30% humidity) and the solution gradually changed color, from clear to a cloudy pale green~yellow solution. The resulting crude was centrifugated at 12,000 rpm for 15 minutes and the precipitate was discarded. Isolated QDs (solid) could be obtained after precipitation by using 0.5 volume equivalents of DMC as a washing solvent immediately followed by centrifugation at 7,000rpm for 15 minutes. These QDs were dispersed in toluene for further analysis, or in heptane (3.0 mg/mL) for device fabrication. Control experiments with distilled OAM were carried out with no differences noted when compared to as received.