Table 1.

Size, luminescence quantum yield, and compositional analysis of as-purchased QDs

QD typea	Mean diameterb [nm]	Quantum yieldc QY [%]	Elemental mass fractiond				Mass ratioe
			Cd	Se	Zn	S	Zn/S	Zn/Cd	Cd/Se
QD617	8.5	58.1f	0.751	0.117	0.002	0.130	0.019	0.003	6.435
QD546	5.6	18.5f	0.734	0.040	0.053	0.174	0.304	0.072	18.297
QD609	5.5	1.2	0.201	0.106	0.439	0.255	1.724	2.187	1.900
QD539	4.3	6.0	0.211	0.029	0.455	0.305	1.494	2.161	7.269

^aThe numerical part of the QD designation reflects the emission maximum in nm recorded in dilute toluene solution; the luminescence spectral bandwidths (full-width-at-half-maximum) for QD539, QD546, QD609, and QD617 were determined to be (0.160, 0.144, 0.117 and 0.074) eV, respectively.

^bThe mean particle diameters were determined either by STEM or analysis of the optical properties; see the ESI for details.

^cThe errors of QY values measured in this fashion are typically assumed to be on the order of ±10%.⁴⁴

^dThis value reflects the mass of each element divided by the summed mass of all four analyzed elements in an analyzed quantity of material, as determined by ICP-AES analysis of QDs after microwave digestion. Compositional analysis data reported here represents the mean values (n = 3); standard deviations are provided in the ESI section.

^eThe ideal (1 : 1) stoichiometric Cd/Se and Zn/S mass ratios are 1.42 and 2.04, respectively.

^fThe QY values of QD617 and QD546 may have been higher at the time they were incorporated into QD/LDPE films, as the QY values for QD617 and QD546 were not measured until after QD609 and QD539 were purchased.