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Optically Functional Zeolites: Evaluation of UV and VUV Stimulated Photoluminescence Properties of Ce3+- and Tb3+-doped Zeolite X

DOI

75

Citations

0

References

2001

Year

T. Jüstel, Detlef Wiechert, Francis C. M. Lau, Dorota Sendor, Ulrich Kynast
Advanced Functional Materials

Abstract

The optical properties of Tb3+/Ce3+ doped zeolites are elucidated with emphasis on ultraviolet (UV) and vacuum ultraviolet (VUV) excitation and luminescence. Ce3+ sensitized Tb3+ emission with quantum yields of 85 % may be obtained at 330 nm excitation. Low absorptivity at 254 nm due to low Ce3+ concentrations or low Ce3+/Tb3+ 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 → Ce3+ (5d1) → Tb3+ (4f75d1) energy transfer channel, which may be exploited for the down-conversion of the Xe2 excimer emission.