Structure and Luminescence Properties of Novel Dyand Tb Activated Ca(PO)Cl Phosphors for Solid-State Lighting Devices.

The novel Dy-and Tb-doped Ca(PO)Cl phosphor is synthesized by the conventional wet chemical technique. The XRD pattern of prepared Dy and Tb doped in host material is in well agreement with the PDF card no. 7032212. The SEM image shows that the size of the particle is non-uniform in size and shape; it ranges in submicrometers. FTIR analysis confirms phosphate (PO) and Ca-O group bonding present in Ca(PO)Cl phosphor. The photoluminescence spectra of the prepared Ca(PO)Cl:Dy phosphor, under the excitation at 350 nm, it exhibit two emission peaks located at 474 nm (F → H) and 572 nm (F → H), emitting blue and orange color respectively. The high-intensity peak is located at 474 nm. The PLE spectra of Ca(PO)Cl:Tb phosphor contain two strong emission peaks centered at 470 (blue) nm and 543 (green) nm, these ascribed due to D → F & D → F transition of Tb ions monitored at 354 and 379 nm excitation. The concentration quenching mechanism between the Dy-Dy ions and Tb-Tb ions is primarily attributed to dipole-dipole (d-d) interactions. The results suggest that Ca(PO)Cl:RE (RE = Dy, Tb) phosphor shows promise for use as a near-UV phosphor in solid-state lighting applications.