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 486 nm and 4F9/2→6H13/2 at 572 nm) with high intense yellow emission and the optimized concentration was found to be 1 mol% 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.
Original language | English |
---|---|
Pages (from-to) | 11228-11233 |
Number of pages | 6 |
Journal | Ceramics International |
Volume | 41 |
Issue number | 9 |
DOIs | |
State | Published - Nov 2015 |
Keywords
- A. Sol–gel process
- C. Optical properties
- X-ray diffraction