Self-doped Ce3+ enhanced CeO2 host matrix for energy transfer from Ce3+ to Tb3+
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Ceria has been widely investigated due to its astonishing properties caused by oxygen vacancies and the facile conversion between Ce3+ and Ce4+. We synthesized luminescence tuneable ceria-based CeO2:Tb3+,Ce3+ nanoparticles, in which Ce3+ was self-doped. Excess Ce3+ ions give rise to energy transfer from Ce3+ to Tb3+ in CeO2:Tb3+,Ce3+ nanoparticles. These nanoparticles show intensity tuneable green luminescence, a long lifetime and low photobleaching in water. Reactive oxygen species (ROS) can be scavenged by these nanoparticles due to the high ratio of Ce3+/Ce4+ in ceria. The luminescence intensity of CeO2:Tb3+,Ce3+ nanoparticles is sensitive to H2O2 (a ROS) concentrations. With increased H2O2 concentration, the luminescence intensity of CeO2:Tb3+,Ce3+ nanoparticles is decreased gradually. The emission intensity can be recovered by treating with ascorbic acid, and this cycling can be repeated, which reveals good anti-fatigue properties of CeO2:Tb3+,Ce3+ nanoparticles. These attractive properties make CeO2:Tb3+,Ce3+ nanoparticles potential materials for ROS detection.
Macromolecular and Materials Chemistry not elsewhere classified