Crystallographic, morphological and photoluminescent investigations of Tb 3+ doped YAlO 3 perovskites for lighting applications.

Terbium (III) doped yttrium aluminate perovskite (YAP:xTb 3+ ) {x = 0.01 to 0.08 mol} were prepared using simplistic gel-combustion method. Structural elucidations were analyzed by X-ray diffraction (XRD) and Rietveld analysis. Fourier transform infrared (FTIR) spectral studies validate the efficient synthesis of designed doped samples. TEM micrograph displayed the agglomerated irregular dimensions of prepared nanocrystalline materials. When excited by 251 nm, a strong emissive line accredited to 5 D 4 → 7 F 5 electronic transition was observed at 545 nm (green emission). The maximum luminescence was found at optimized concentration (0.05 mol) of Tb 3+ ions, over this emission was quenched by dipolar-dipolar (d-d) interactions. Chromaticity (x and y) and correlated color temperature (CCT) parameters were obtained by analysing emission profiles. Lastly, the color coordinates of nanophosphors were closer to the National Television Standards Committee (NTSC) green coordinates which replicates their potency in the design and architecture of R-G-B based white LEDs.