Glow in the dark: Nanocrystalline CaF2 and CaF2:Ce,Tb particles are produced via a polyol-mediated synthesis. The nanomaterials are 20 nm in size, monodispersed, nonagglomerated, and redispersible. Excitation and emission spectra of CaF2:Ce,Tb illustrate the luminescence of powder samples, and a suspension in diethylene glycol also shows intense green-light emission under UV excitation (see image).
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Feldmann et al. (2006) studied this question.
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