Orange-red luminescence in KAl1-xPO4F: Eux 3+ (0.1 ≤ x ≤ 1.0) halophosphate phosphor by a novel facile combustion method

Red-emitting phosphor KAl1-xPO4F: Eu-x (3+) (0.1 <= x <= 1.0) were fabricated by combustion process at temperature 750 degrees C. The XRD patterns did not indicate presence of the starting constituents and other likely phases which are an indirect evidence for the formation of the desired compound. The photoluminescence study shows that the intensity of electric dipole transition (D-5(0) -> F-7(2)) at 613 nm dominates over that of magnetic dipole transition (D-5(0) -> F-7(1)) at 595 nm. The FTIR also shows peaks appearing at 585.41-827.92 cm(-1) and 912.99-1074.12 cm(-1) correspond to the bending vibrations (v(4) region) and stretching vibrations (v3 region) of PO4(3) group, respectively. The chromaticity coordinate of KAlPO4F: Eu3+ phosphor (x = 0.674, y = 0.325) is much closer to National Television Standard Committee (NTSC) standard value for red phosphor (x = 0.670, y = 0.330). All the spectrum features indicate that KAlPO4F: Eu3+ might be a promising phosphor for lighting or w-LEDs. (C) 2017 The Author(s). Published by Elsevier B. V. This is an open access article under the CC BY-NC-ND license.