We also compare RET donor performance of the CNPs to lone plasmonic nanoparticles, which are modeled as 5 nm spherical silver and gold nanoparticles embedded in the same surrounding medium (n = 1.33). Hamiltonian and Lindbladian parameters for the plasmonic donors were obtained in a manner similar to that described above, except that analytical absorption spectra were obtained from Mie theory rather than FDTD simulations. We use the permittivity data of Palik for platinum in our electrodynamics simulations, and permittivity data of Johnson and Christy is used for gold and silver. Due to the small size of the plasmonic nanoparticles and the metal components of the CNPs, quantum size effects are expected to play a role in the spectral response. We account for these size effects by introducing a phenomenological correction to the intraband contribution to the permittivity; we do not consider size corrections to the interband contribution to the permittivity which have been theoretically shown to converge to the bulk limit for sizes smaller than the nanoparticles considered in this work . The details for the intraband correction, as well as tables of Hamiltonian and Lindbladian parameters, can be found in the SI (see Tables S1, S2, and S3).