Abstract
The Y3(Al,Ga)5O12:Ce3+,Cr3+,Nd3+ (YAGG) nano-phosphors with homogeneous particle-size distribution, low aggregation and average crystalline size of about 65 nm were obtained using a modified Pechini method. Only slight aggregation of the crystallites occurs after post-annealing at 1100 °C. The intense Ce3+ bands in the excitation spectra of the Ce3+,Cr3+,Nd3+ co-doped materials monitoring the Cr3+ emission at 690 nm indicate energy transfer from Ce3+ to Cr3+. Weak Nd3+ lines are observed, as well. In addition, the emission of Nd3+ at 1060 nm with excitation of Ce3+ and Cr3+ confirms the Ce3+/Cr3+ to Nd3+ energy transfer. The short average luminescence decay times for the Ce3+ emission indicate the Ce3+/Cr3+ to Nd3+ energy transfer. Eventually, the Y3(Al,Ga)5O12:Ce3+,Cr3+,Nd3+ nano-phosphors exhibit persistent luminescence originating from the 4f3 → 4f3 transitions of Nd3+ which matches well to the first biological window to be used in bioimaging applications.
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