Structural, Morphological and Photoluminescence properties of RE (RE= Dy 3+ , Eu 3+ , Sm 3+ ) doped CaAlBO 4 phosphor synthesized by combustion method.

The CaAlBO4 : RE (RE= Dy3+ , Eu3+ , Sm3+ ) phosphor were prepared via combustion synthesis and studied by X-Ray diffraction, FTIR analysis, scanning electron microscope, EDS, photoluminescence spectra and CIE Coordinates. The phase formation of obtained phosphor was analyzed by XRD and its result confirmed by standard PDF card No. 1539083. XRD data successfully indicated pure phase of CaAlBO4 phosphor. The crystal structure of CaAlBO4 phosphor is orthorhombic with space group Ccc2 (37). The scanning electron microscope image of CaAlBO4 phosphor reveals an agglomerated morphology and non-uniform particle size. The EDS image provides evidence of the elements presence and the chemical makeup of the materials. Under the 350 nm excitation, the emission spectrum of Dy3+ ions activated CaAlBO4 phosphor consist of two main groups of characteristics peaks located at 484 nm & 577 nm which are ascribed to 4 F9/2 → 6 H15/2 & 4 F9/2 → 6 H13/2 transition of Dy3+ ions respectively. The PL emission spectra of CaAlBO4 : Eu3+ phosphor shows characteristics bands observed around at 591 nm and 613 nm, which corresponds to 5 D0 → 7 F1 and 5 D0 → 7 F2 transition of Eu3+ ions respectively, upon 395 nm excitation wavelength. The emission spectra of Sm3+ activated CaAlBO4 phosphor shows three characteristics bands observed at 565 nm, 601 nm and 648 nm which emits yellow, orange and red color. The prominent emission peak at 601 nm wavelength, which is attributed to 4 G5/2 → 6 H7/2 transition which display orange emission. The CIE color coordinates of CaAlBO4 :RE (RE= Dy3+ , Eu3+ , Sm3+ ) phosphor are calculated to be (0.631,0.368), (0674,0325) and (0.073, 0.185). As per the obtained results, CaAlBO4 : RE (RE = Dy3+, Eu3+, Sm3+ ) phosphor may be applicable in eco-friendly lightning technology.