Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5398882 | Journal of Luminescence | 2015 | 6 Pages |
â¢The exceptionally broad emission and the thermal quenching of Ca4(PO4)2O:Eu2+.â¢The precise crystal structure refinement by neutron diffraction.â¢The relationship between the optical properties and the crystal structure.
The unique emission characteristics and the crystal structure of Ca4(PO4)2O:Eu2+ were studied. Considerably broad emission from 500Â nm to 800Â nm was measured at 77Â K when the material was excited at 365Â nm. Its crystal structure was refined using neutron diffraction, allowing precise and accurate oxygen positions to be determined. This enabled a relationship between the optical properties and the crystal structure crucial for achieving a large redshift of the 5d level of Eu2+ to be established, which is important to match the excitation energy band with near-ultraviolet or blue light-emitting-diodes used for solid-state lighting. The importance of the anion polarizability and the distortion of the coordination polyhedron were also discussed.