Fluorescence resonance energy transfer of CaF: Eu, Tb applied to dye-sensitized solar cells.

CaF: Eu, Tb introduced into dye-sensitized solar cells (DSSCs) were studied to examine the influence of luminescent materials on photoanodes using a simple method. The emission spectra of CaF: Eu, Tb included the blue light of Eu (4f → 5d) at 430 nm and green emission of Tb (D → F) at 542 nm under the monitoring wavelengths at 398 nm, which matched well the absorption range of the N719 dye in DSSCs. Energy transfer (ET) was verified between Eu and Tb ions and the efficiency of ET found to increase with Tb concentration.