Preparation of TEM grids for statistical analyses. The toluene solution of QDs (blue and green) at the 1 mg/mL concentration (10 μL) was drop casted onto a SHR-C075 microgrid placed on a paper that absorbed excess toluene. The resulting TEM grid was placed in vacuo (60 Pa) at 298 K for 1 hour. Statistical analyses were performed immediately after preparation of TEM grids.