The optical properties of Tb 3+ /Ce 3+ doped zeolites are elucidated with emphasis on ultraviolet (UV) and vacuum ultraviolet (VUV) excitation and luminescence. Ce 3+ sensitized Tb 3+ emission with quantum yields of 85 % may be obtained at 330 nm excitation. Low absorptivity at 254 nm due to low Ce 3+ concentrations or low Ce 3+ /Tb 3+ ratios, which are required for the suppression of UV components, restricts their applicability as phosphors for Hg-based discharges, e.g., in conventional fluorescent lamps. Near band edge excitation at 172 nm revealed an immediate quantum yield of 50 % enabled by a zeolite ® Ce 3+ (5d 1 ) ® Tb 3+ (4f 7 5d 1 ) energy transfer channel, which may be exploited for the down-conversion of the Xe 2 excimer emission.
The optical properties of Tb 3+ /Ce 3+ doped zeolites are elucidated with emphasis on ultraviolet (UV) and vacuum ultraviolet (VUV) excitation and luminescence. Ce 3+ sensitized Tb 3+ emission with quantum yields of 85 % may be obtained at 330 nm excitation. Low absorptivity at 254 nm due to low Ce 3+ concentrations or low Ce 3+ /Tb 3+ ratios, which are required for the suppression of UV components, restricts their applicability as phosphors for Hg-based discharges, e.g., in conventional fluorescent lamps. Near band edge excitation at 172 nm revealed an immediate quantum yield of 50 % enabled by a zeolite ® Ce 3+ (5d 1 ) ® Tb 3+ (4f 7 5d 1 ) energy transfer channel, which may be exploited for the down-conversion of the Xe 2 excimer emission.
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