Novel Dy^3＋-doped Gd（PO3）3 white light phosphors each with an orthorhombic system are successfully synthesized by solid-state reaction.The luminescence properties of white-light Gd1-x（PO3）3：xDy^3＋（0 〈 x ≤ 0.25） under vacuum ultraviolet（VUV） excitation are investigated.The strong absorption at around 147 nm in excitation spectrum energy can be transferred to the energy levels of Dy^3＋ ion from the host absorption.Additionally,the white light phosphor is activated by a single Dy^3＋ ion.Therefore,the luminescence of Gd1-x（PO3）3：xDy（0 〈 x ≤ 0.25） under VUV excitation is effective,and it has the promise of being applied to mercury-free lamps.
Mg2Sn04 exhibits green photoluminescence and persistent luminescence, which originate from oxygen vacancies. When Ti4＋ ions were doped, an interesting Mg2SnO4：Ti4＋ phosphor with bluish white photoluminescence under ultraviolet irradiation and with green persistent luminescence was first obtained. Our investigation reveals that two emission centres exist in Mg2SnO4：Ti4＋. The centres responsible for the green emission are considered to be the F centres （oxygen vacancies） and the blue centres are the TiO6 complex. Trap clusters in the band gap with different [Snmg-oi],[snmg-VO], [SnMg-VO ] and mgsn,correspond to the components at 85 °C, 146 213 °C of the thermoluminescence curve.
