Structural, morphological, and photoluminescence properties of RE (RE = Dy , Eu , Sm )-doped CaAlBO phosphor synthesized by combustion method.

The CaAlBO :RE (RE = Dy , Eu , Sm ) phosphor were prepared via combustion synthesis and studied by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) analysis, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), photoluminescence (PL) spectra and CIE coordinates. The phase formation of the obtained phosphor was analyzed by XRD and the result was confirmed by standard PDF Card No. 1539083. XRD data successfully indicated pure phase of CaAlBO phosphor. The crystal structure of CaAlBO phosphor is orthorhombic with space group Ccc2 (37). The SEM image of CaAlBO phosphor reveals an agglomerated morphology and non-uniform particle size. The EDS image provides evidence of the elements present and the chemical makeup of the materials. Under the 350 nm excitation, the emission spectrum of Dy activated CaAlBO phosphor consists of two main groups of characteristic peaks located at 484 and 577 nm which are ascribed to F  →  H and F  →  H transition of Dy respectively. The PL emission spectra of CaAlBO :Eu phosphor shows characteristics bands observed around 591 and 613 nm, which corresponds to D  →  F and D  →  F transition of Eu respectively, upon 395 nm excitation wavelength. The emission spectra of Sm activated CaAlBO phosphor shows three characteristic bands observed at 565, 601 and 648 nm which emits yellow, orange and red color. The prominent emission peak at the wavelength 601 nm, which is attributed to G  →  H transition, displays an orange emission. The CIE color coordinates of CaAlBO :RE (RE = Dy , Eu , Sm ) phosphor are calculated to be (0.631, 0.368), (0.674, 0.325) and (0.073, 0.185). As per the obtained results, CaAlBO :RE (RE = Dy , Eu , Sm ) phosphor may be applicable in eco-friendly lightning technology.