Abstract
Vacuum ultraviolet (VUV) excitation and emission properties of a new Tb 3+-activated green-emitting phosphor with huntite-type gallium borate, LnGa 3(BO 3) 4:Tb 3+ ( Ln = Y, Gd), are investigated. Overall absorption bands are in the range of 120–250 nm and can be tentatively interpreted in terms of the charge transfer transition from host to rare earth ions and the Tb 3+ activator. Additionally, an appropriate atomic ratio of Y 3+/Gd 3+ in the host compound enhances both the excitation and emission efficiency under VUV excitation. Enhanced absorption efficiency for the VUV light makes these novel phosphors the prominent luminescent materials with plasma-discharge conditions, by converting the VUV radiation to the visible light.
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