Figure 4.

(a) UV-Visible absorbance of ZIF8-RF (blue), RF (green) and ZIF8 (red). (b) Room temperature photoluminescence spectra (excitation at 375 nm) of RF (green) and ZIF8-RF (blue). Inset shows steady state excitation spectra of RF (green) and ZIF8-RF (blue) at 450 nm. (c) Spectral overlap of ZIF8 (donor) and RF (acceptor). (d) The picosecond-resolved fluorescence transient of ZIF8-RF (blue), RF (green) and ZIF8 (red). The excitation wavelength was 375 nm and the collection wavelength was 450 nm.