Overall, we observe that HgTe NPLs can act as highly efficient energy antennas to HgTe QDs with bandgaps in the shortwave infrared. The energy transfer is highest when the QDs are grown in-situ from the excess precursors in solution during cation exchange. We evaluate the energy transfer of this system to be near unity and determine that excitons within NPLs must diffuse a large area before reaching the QD, and the exciton diffusion constant is higher than reported for other nanocrystals. These results both highlight the similarities between NPLs and extended 2D semiconductors such as transition metal dichalcogenides and provide a promising platform for infrared energy collection and concentration.