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Organic cells and dye-sensitized cells developed to-date have a narrow active absorption range, relative to the spectral range of the available solar resource. Their efficiency could be significantly enhanced through a process of down-shifting (DS) and up-conversion of non-absorbable photons converting them to photons better matching the spectral response of the particular solar cell. The DS molecules must exhibit a large Stokes shift and high luminescent quantum yield when incorporated in the downshifting polymer layer. In this paper, the QY of a downshifting Europium (III) complex in solution is determined using two distinct experimental techniques. The QY is measured for varying concentration and at varying excitation wavelength.
Kennedy, M., Aubouy, L., Gutiérrez-Tauste, D., Jorge, A., Faccini, M., Noriega, G., Di Lorenzo, M., Cocca, M., Avella, M., Errico, M., Gentile, G., Doran, J., Norton, B., Baluschev, S., Guardiola, J., Molina, A., Puigdollers, J., Voz, C., Daren, S., Tsvetkov, F., Pashov, A.: Solar Cell Efficiency Enhancement Through Down-Shifting and Up-Converting Layers: the Ephocell Project: Luminescent Downshifting Quantum Yield Measurements. 25th European Photovoltaic Solar Energy Conference and Exhibition, Valencia, Spain, Sept, 2010.