Abstract
-ion-doped anatase nanocrystals were prepared by simple wet chemical synthesis. Very sharp and intense near-infrared luminescence at approximately was observed that originated from the lattice site of ions incorporated in nanocrystals. Based on the high-resolution emission and excitation spectra at , an efficient energy transfer from the host to ions was verified. The luminescence decay for the transition at showed nonexponential characteristics, indicating a nonradiative relaxation to the defects in the nanocrystals, and the intrinsic lifetime of the state was determined to be .
© 2008 Optical Society of America
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