Eu(III)-doped barium tellurooxyphosphate phosphor with orange-red emission

Eu 3 + photoluminescence (PL) is studied in the tellurooxyphosphate, Ba2TeO(PO4)2, host. A series of phosphor compositions with varying concentrations of Eu 3 + dopant in Ba2TeO(PO4)2 are synthesized by high temperature solid-state reaction and the PL spectra are recorded. Under 395 nm wavelength excitation, the emission spectrum shows a single peak corresponding to the non-degenerate transition, 5D → 7F indicating that Eu 3 + preferentially occupies a single crystallographic site. The peak due to the degenerate hypersensitive 5D → 7F 2 electric dipole transition of Eu 3 + in the emission spectrum indicates that the site occupied by Eu 3 + in the tellurooxyphosphate host lattice is non-centrosymmetric. The CIE coordinate values are x= 0.61 and y= 0.34 and are found to be close to the values of the reference phosphor Y 2O 3: Eu 3 +.