Luminescence investigation of Sm 3+ ,Eu 2+ -activated/co-activated Ba 2 AlB 4 O 7 Cl phosphors: novel red to blue colour tuning in chloroborates.

Borochlorate phosphors have shown their worth in modern day lighting over the last few years. Colour tunability of the phosphor is a modern techniques used to obtain white-light-emitting diodes (WLEDs). In the proposed work, Sm 3+ ,Eu 2+ -activated/co-activated Ba 2 AlB 4 O 7 Cl phosphors were investigated for WLED applications as well as display devices. A convectional solid-state diffusion method was used to synthesize the proposed phosphors. X-ray diffraction (XRD) of the proposed phosphors confirmed the crystalline nature of the sample. Morphological studies on the samples were carried out using scanning electron microscopy analysis. A photoluminescence study of the colour tunable phosphor showed the characteristic peak of Sm 3+ together with one broad peak for Eu 2+ ions. Red to blue colour tunability was observed in the proposed phosphor with enhancement of Eu 2+ ions. All these results showed the worth of this sample in WLED applications as well as in display devices.