In addition, a variety of surface sites is observed, which could be converted completely into bulk sites by overgrowing the nanoparticles with a shell of pure LaPO 4. These sites correspond to those known from bulk LaPO 4. Depending on the concentration of the dopant, up to three different lattice sites could be identified in the interior of the LaPO 4 nanoparticles. In this spectroscopic method, Eu 3+ ions occupying different lattice sites are selectively excited with a tunable narrow-bandwidth laser system and distinguished by their luminescence spectra (“site-selective spectroscopy”). A variety of redispersible Eu 3+-doped LaPO 4 nanoparticles have been prepared in a high-boiling coordinating solvent mixture, and the Eu 3+ lattice sites of these materials have been investigated by luminescence line-narrowing measurements.
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