Photoluminescence properties of Ca4La6(SiO4)4(PO4)2O2-based phosphors for wLEDs

Abstract

The apatite compound Ca 4 La 6 (SiO 4 ) 4 (PO 4 ) 2 O 2 (CLSPO) was explored as the host material for phosphors used in white light-emitting diodes (wLEDs). The crystal structure of the CLSPO host prepared by the solid-state reaction method was investigated with Rietveld refinement. The rare earth ions (Eu 3+ / Tb 3+ /Ce 3+ , Tb 3+ /Tb 3+ , Mn 2+ ) activated CLSPO phosphors were synthesized, and their photoluminescence properties, quantum yields, as well as thermal stabilities, were studied. Under near-ultraviolet excitations, the Eu 3+ and Tb 3+ -doped CLSPO compounds exhibited red and green emissions with high luminescence efficiencies. Besides, tunable emissions from green to orange were obtained by introducing Mn 2+ ions into the Tb 3+ -doped CLSPO samples. The results showed that the phosphors studied may have potential applications for wLEDs.