研究目的
To modify the photoluminescence (PL) spectra of a cerium (Ce3+) doped strontium fluoride (SrF2:Ce3+) phosphor for better sensitization for solar cell application.
研究成果
Modifications of the PL spectra of SrF2:Ce3+ were achieved by different cation ions’ substitutions. Small Red shift changes of the emission maximum were caused by a divalent substitution. The relative excitation band was also modified by the partial cation ions’ replacement. The maximum modification in the PL spectra was observed with the substitution of Ba ions. A modification of the excitation spectra was also achieved in Sr0.49Ba0.5Ce0.01F2, with a shift to shorter wavelengths which becomes far more suitable for solar cell applications.
研究不足
The conversion efficiency of photovoltaic cells is limited due to the mismatch between the solar cell efficient region with that of the solar excitation spectrum. The excitation spectrum of Sr0.49Ba0.5Ce0.01F2 shifted to shorter wavelengths (around 245 nm) that is far from the spectral distribution of sunlight at AM 1.5G. These results are therefore not suitable for solar cell applications.
1：Experimental Design and Method Selection:
The co-precipitation method was used to synthesise the phosphor samples. Analytical grade of chlorine sources of Ca, Ba, La(NO3)3 and Mg(NO3)
2：6H2O, Ce(NO3)5H2O, SrCl2 and NH4F were utilized without further purification. Sample Selection and Data Sources:
NH4F was added into the solution of SrCl2 and CaCl2 in 100 ml distilled water under vigorous magnetic stirring. The opaque white suspension of the mixture was obtained after thoroughly stirring for 1 hour. A centrifuge that was operated at 5000 rpm was used for 30 min to obtain a sediment from the mixture. The sediment was washed with ethanol and water in order to remove impurity ions. It was then heated at 80 0C for 48 hours.
3：List of Experimental Equipment and Materials:
X-ray diffraction (XRD) patterns of the product was obtained with a Bruker Advance D8 diffractometer ((Cu Kα x-rays (λ = 0.154 nm)). A PHI 5000 Versaprobe system was utilized to obtain the high resolution x-ray photoelectron spectroscopy (XPS) spectra. Charging was minimized using a low energy Ar+ ion gun in combination with a neutralizer electron gun. A 25 W, 15 kV electron beam was used to generate a 100 μm diameter monochromatic Al Kα x-ray beam (hν = 1486.6 eV) to analyse the samples. The PL and lifetime spectra were performed at room temperature by using a FS5 and FS980 Edinburg instrument. The luminescence spectra were corrected for the spectral response of the apparatus.
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