The absorption (solid line) and emission (dashed line) spectra of in-situ grown HgTe QDs + NPLs and mixed QDs + NPLs. Both samples are excited above and below the NPL bandgap (750 nm and 950 nm, respectively) to excite the donor + acceptor and acceptor only. The inset highlights the difference in PL intensity between the in-situ and mixed heterostructures. The (*) indicates regions of C-H stretch reabsorption from the hexanes solvent. All subsequent quantum efficiency values reported are collected in hexanes, but a comparison to TCE is given in the Supporting Information. (b) The quantum efficiency (QE) of energy transfer is calculated for both systems. The mixed system is evaluated at increasing concentrations, while the in-situ QE is calculated and the number of QD per NPL is estimated from the spectra. All data points are a result of the mean of multiple trials, and error is calculated through the standard error of the mean.