The photoluminescence spectra of the colloid solution of 1 are shown as a function of added OAM in Fig. (the reaction terminated after 3 h at 25 °C). When we increased the amount of OAM from 0.1 to 1.0 equiv, emission at 517 nm blue-shifted via bimodal emission at 0.4 equiv to exclusive emission at 453 nm with 1.0 equiv. Interestingly, we found little sign of QD5 and QD6 emitting at <500 nm, and instead found exclusively QD4 emitting at 453 nm. Strong preference for the formation of QD4 lends some credence to a growth mechanism including the tetranuclear intermediate in Fig. . Fig. (MLA•MA, blue line) illustrates a sudden blue shift of the emission between 0.25 and 0.5 equiv of OAM. The PLQY of emission at 453 nm reaches >95% with 1-3 equiv OAM (Fig. ), and FWHM remains narrow for 0.75-3 equiv of OAM (Fig. ). In contrast, the synthesis of OA•MA•QD4 (3) made from OA instead of MLA produced much more defective QDs. As shown in Fig. and 3e (black line), upon addition of 0.1 to 1.5 equiv of OAM, the emission shifted gradually from the green to the blue, since no complex is formed, and the PLQY steadily decreased after peaking at »0.7 equiv. The FWHM (Fig. ) first increases because of sizeshifting (Fig. ) but then drops to below 16 nm. The OAmediated growth went through QD6, QD5, and QD4, whereas smaller QDs were clearly not favored. We attribute the very sharp transition at ≈0.7 equiv OAM when MLA is used to the sudden precipitation of the Pb-MLA complex, which allows MLA to fully serve as a tridentate ligand.