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2. ENGINEERING AND TECHNOLOGY
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. (2010). 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, 6-9 September. doi:10.4229/25THEUPVSEC2010-1DV.4.48