This is because Pr3+ has much larger dipole polarizability than Y3+ and Yb3+, leading to the transform of Raman scattering mode from β-NaYF4 crystal to β-NaPrF4 crystal with increasing doping concentration of Pr3+, which has been reported early. In a word, if there is no investigation on single MC, especially the anisotropy, it will be difficult to understand the difference among the Raman spectra of β-NaYF4:Yb3+,Pr3+ groups.
This is because Pr3+ has much larger dipole polarizability than Y3+ and Yb3+, leading to the transform of Raman scattering mode from β-NaYF4 crystal to β-NaPrF4 crystal with increasing doping concentration of Pr3+, which has been reported early. In a word, if there is no investigation on single MC, especially the anisotropy, it will be difficult to understand the difference among the Raman spectra of β-NaYF4:Yb3+,Pr3+ groups.
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