Solid state synthesis and luminescence of NaBPO_4:Eu~(2+) (B = Ca, Sr, Ba) phosphors

摘要

A series of Eu~(2+) doped NaBPO_4 (B = Ca, Sr, Ba) phosphors were synthesized by a solid state reaction. The XRD patterns of the obtained phosphors indicate that the Eu~(2+) doping does not change the phase of the host. The obtained Eu~(2+) doped NaBPO_4 (B = Ca, Sr, Ba) phosphors exhibit emission bands originating from the 4f-5d transitions of Eu~(2+) ions. The emission spectra of Eu~(2+) doped NaBPO_4 (B = Ca, Sr, Ba) phosphors also show that the optimum concentrations of Eu~(2+) in these three hosts all are 5 mol%. The blue shifts can be observed when we compare the emission wavelength of Eu~(2+) doped NaBPO_4 (B = Ca, Sr, Ba) phosphors. The blue shifts of emission wavelength are induced by the decreasing crystal field splitting of Eu~(2+) in NaBPO_4 (B = Ca, Sr, Ba) hosts.