Photoluminescent Porous Alginate Hybrid Materials Containing Lanthanide Ions.

The photoluminescence features of Eu 3+-, Tb 3+-, Tb 3+/Eu 3+-alginate aerogel (hydrogel and alcogel) and Eu 3+-alginate xerogel hybrids were investigated. The Eu 3+-alginate aerogel and alcogel exhibit the highest 5D 0quantum efficiencies (9.9 and 8.2%, respectively), while the hydrogel and xerogel have lower values (5.2 and 5.6%, respectively). The Tb 3+/Eu 3+hybrids are multiwavelength emitters in which the emission color can be tuned across the chromaticity diagram from the red toward the yellowish-green spectral regions, crossing the white area by selecting the excitation wavelength. [ABSTRACT FROM AUTHOR]