Wet-chemical preparation of barium magnesium orthophosphate, Ba₂Mg(PO₄)₂:Eu²⁺, nanorod phosphor with enhanced optical and photoluminescence properties

Abstract

We report a wet-chemical synthesis of yellow-emitting nanorod phosphors based on a Eu 2+doped Ba 2 Mg(PO 4 ) 2 (BMP:Eu) orthophosphate compound, and its enhanced optical and photoluminescence properties. A phase-pure BMP:Eu nanorod phosphor was prepared, for the first time, by using a two-step procedure: preparation of an amorphous nanorod precursor by a solution method (pH and reaction-temperature control) and a subsequent post-annealing process. The BMP:Eu phosphor prepared under optimal conditions (5.0 mol.% of Eu 2+ , reacted at a pH 9, and annealed at 800 °C in a reducing atmosphere) consisted of ~350 nm (length) × ~60 nm (diameter) nanorods. This phosphor exhibited superior photoluminescence and optical properties compared to a micro-sized bulk BMP:Eu phosphor that was prepared by using a conventional solid-state reaction method: the nanophosphor, exhibited a higher light absorption in the n-UV region and higher transmittance of longer-wavelength light (yellow, ~ 600 nm), owing to its smaller/uniform size, nanorod morphology, and high dispersivity in epoxy. The nanophosphor is therefore well-suited for white-LED applications.

Luminescence and energy transfer of single-phase white-emitting phosphor Ba2Mg(PO4)2:Ce3+, Eu2+ for white LEDs

“…Its physical and chemical properties are stable. Although the luminescence performance of Ba 2 -Mg(PO 4 ) 2 :Eu 2+ has been widely investigated, [30][31][32][33][34][35][36] however, a systematic study on the energy transfer between Eu 2+ and Ce 3+ in Ba 2 Mg(PO 4 ) 2 was not reported. In this work, the crystal structure of Ba 2 Mg(PO 4 ) 2 and preferred crystallographic sites for activators were reported.…”