Emitting-Color Tunable Phosphors Sr3GaO4F:Ce3+ at Ultraviolet Light and Low-Voltage Electron Beam Excitation

Sr 3−2 x Ce x Na x GaO 4 F phosphors were prepared through a high-temperature solid-state reaction method. Their photoluminescence and cathodoluminescence properties were investigated. Under ultraviolet light and low-voltage electron beam excitation, the phosphors show a typical broad emission of Ce 3+ and the luminescence color can be tuned in a large gamut from greenish-blue to yellowish-green by changing Ce 3+ concentration in the range of 0.01−0.30 ( x value). Their luminescence behaviors are discussed in terms of Ce 3+ in two distinct sites. The lowest 5d absorption bands are respectively at ∼405 and ∼430 nm for Ce(1) 3+ [i.e., Ce 3+ in Sr(1) 2+ site] and Ce(2) 3+ [i.e., Ce 3+ in Sr(2) 2+ site] centers, while the emissions from relaxed 5d state to 2 F 5/2 ground state are respectively at ∼456 nm for Ce(1) 3+ and ∼567 nm for Ce(2) 3+ .