Photometric features and typical white light emanation via combustion derived trivalent dysprosium doped ternary aluminate oxide based nanophosphor for WLEDs

Trivalent dysprosium doped ternary aluminate oxide based SrGd2Al2O7 nanocrystalline phosphors were synthesized via an efficient single step solution combustion process. The estimated value of optical band gap energy for the optimized nanophosphor and host matrix were found to be 5.58 eV and 5.76 eV respectively. Diverse crystalline features were elucidated via analyzing PXRD patterns and Rietveld refined results of host matrix and optimal SrGd1.94Dy0.06Al2O7 nanophosphor. Diverse elements present in the optimized nanophosphor were found to be Sr, Gd, Dy, Al and O as revealed via energy diffraction X-ray analysis (EDAX). The surface morphological features and the particle size of the optimum nanosample were disclosed by scanning electron microscope (SEM) and transmission electron microscope (TEM) practices. The characteristic emission spectra recorded using excitation wavelength of 350 nm display two strong peaks at 484 nm and 578 nm that were allotted to F-4(9/2 )-> H-6(15/2) and F-4(9/2) -> H-6(13)/2 respective transitions. The evaluated critical distance value was ensured to be much higher than 5 angstrom indicating no chance of occurrence of concentration quenching (CQ) as a result of exchange interactions amongst dopant ions. Dipole-dipole interactions in the midst of adjoining Dy3+ ions were observed to be an appropriate cause for following CQ trend. Based on outcomes of Correlated Color Temperature (CCT) and International Commission on Illumination (CIE), it was quite obvious that the prepared nanomaterial will prove to be absolutely beneficial for applications related to lightning and display systems. Thus, it can be concluded that a new window opens for white light emitting diode (WLED) applications using the synthesized nanophosphors.