Abstract
Eu3+ doped Ba2YAlO5 nano-crystalline phosphor is synthesized for the first time using urea assisted solution combustion approach. X-ray diffraction analysis depicts that single phased Ba2Y(1-x)EuxAlO5 sample obtained by post heat treatment for 4 h at 1225 °C crystallize in monoclinic lattice with P21/ (11) space group. Transmission electron microscopy (TEM) studies reveal semi-spherical shaped particles in nano dimension ranging 40–90 nm. Photoluminescent studies elicits that this nanophosphor can be efficiently excited by NUV light generating emission in the red region. Ba2Y0.95Eu0.05AlO5 is found to be the optimal composition for achieving the maximum luminescence. Concentration controlled luminescent behavior can be utilized to obtain the chromatic color tuning from blue to red region. Luminescent centres shows cross relaxation via quadrupole-quadrupole interactions beyond 5 mol% concentration of Eu3+ ion leading to concentration quenching. Judd-Ofelt intensity parameters and refractive index of host are also determined. Chromatic color tuning proclaim the possible utilization of this nano-crystalline phosphor in NUV excited solid state lighting devices.