where 𝑅 is the distance between QD and NPL and 𝑟 0 is the size of the NPL. The traditional 𝑅 distance dependence is recovered at the far-field limit, but in the case of near-field FRET, the rate equation has a different distance dependence and pre-factor. This behavior is also shown through numerical calculation, where a transition of 𝑅 -4 to 𝑅 -6 dependence can be clearly seen with increasing donor-acceptor distances (Figure ). Considering the high QD-to-NPL ratio and the relatively large size of the NPL, it is likely that the traditional (𝑅 -6 ) FRET rate equation fails to accurately describe the situation and it is necessary to use the near-field FRET rate equation. We then used the obtained near-field FRET rate equation in kinetic Monte Carlo simulations to calculate the FRET efficiencies for different QD concentrations (see Supporting Information Section S7 for details). Based on the simulations, we can confirm that the donor-acceptor distances are indeed in the near-field range where 𝑅 -4 dependence should be used. The average distance depends on the QD-NPL ratio, but we found these R/r0 distances to be between 0.0136 -0.0216 (shown on a log scale in Figure ). By comparing the simulations with experimental results (Figure ), we can conclude that the near-field FRET is indeed the energy transfer mechanism in the mixed case. Additional passivation through added ligand (1% w/v% oleylamine in hexanes solvent) before mixing improved the QE by ensuring that all nanocrystals remained suspended in solution during the measurements and passivate surface defects which might affect either nanocrystal (a comparison to no added ligand is given in Figure ). We also attempted to conduct the measurements in tetrachloroethylene (TCE) to avoid significant solvent reabsorption but found that this solvent reduced the QE (1-15% for mixed case and 36% for in-situ case, full results in Figure ) and dissolved the nanocrystals after a few hours, likely by the difference in solvent polarity compared to hexanes. Therefore, the values we report in Figure are all collected in hexanes. Overall, these results highlight the advantage of in-situ grown QDs as having near complete transfer from the large area NPLs, establishing an efficient energy harvesting system.