A new single-host white-light-emitting BaSrMg(PO4)2: Eu2+ phosphor for white-light-emitting diodes

A single-host white-light-emitting phosphor, Eu2+ doped BaSrMg(PO4)2 (BSMP: Eu2+), was prepared by solid-state reaction. BSMP: Eu2+ shows two main emission bands peaking at 447 and 536 nm, respectively. The emission band peaking at 447 nm is attributed to the 4f65d1-4f7 transition of Eu2+ substituting Sr2+, while the emission band peaking at 536 nm originates from the 4f65d1-4f7 transition of Eu2+ replacing Ba2+ in host lattice. A white light-emitting diode (WLED) was fabricated by combination of a 380 nm emitting InGaN chip and the prepared white phosphor BSMP: Eu2+. In comparison with commercial GaN-pumped YAG: Ce3+ phosphor, BSMP: Eu2+ shows higher color stability against input forward-bias current and excellent color rendering index.