Synthesis of OA•MA•QD4 (3). To 29.4 mg of PbBr2, 9.0 mg of MABr and DMF (2 mL) were then added to form a 40 µmol/mL solution (MA:Pb = 1:1). OA (379 µL, 15 equiv) and OAM (53 µL, 2 equiv) were added. The resulting clear precursor solution (100 µL) was added to 5 mL of toluene under vigorous stirring. The solution was then let to be stirred for 3 h at rt under ambient (20 °C / 30% humidity) and the solution gradually changed color, from clear to orange. The resulting crude was centrifugated at 10,000 rpm for 10 minutes and the precipitate was discarded. Isolated QDs (solid) were obtained after precipitation by using 0.5 volume equivalents of DMC as a washing solvent immediately followed by centrifugation at 15,000rpm for 20 minutes.