Abstract
A series of Dy3+ ions activated CaGd2ZnO5 (CGZO) nanophosphors were synthesized by a modified citrate sol–gel method. The X-ray diffraction pattern confirmed their orthorhombic structure. The field-emission scanning electron microscope images established that the CGZO particles acquired irregular shapes within the nanometer range. The photoluminescence (PL) excitation spectra of CGZO:Dy3+ showed a strong host absorption band along with low intense peaks corresponding to the f–f transitions of Dy3+ ions, indicating that efficient energy transfer occurred between the CGZO host lattice and Dy3+ ions. The PL emission spectra exhibited the characteristic emission bands of Dy3+ ions (4F9/2→6H15/2 at 486nm and 4F9/2→6H13/2 at 572nm) with high intense yellow emission and the optimized concentration was found to be 1mol% in this CGZO host lattice. The cathodoluminescence spectra also showed a similar behavior that observed in the PL spectra and the emission intensities of the CGZO:1Dy3+ nanophosphor increased continuously with increasing the accelerating voltage and filament current. These novel nanophosphors are expected to have potential applications in the fields of optical displays and field-emission display systems.
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