Multi-color luminescence in Eu³⁺/Tb³⁺ co-doped ZnAl amorphous materials and their annealed samples

Yufeng Chen¹，Jiwan Zhang¹，Yanmei Hu¹，Xiaoqing Wang¹，Li Wang²

1. College of Chemistry, Nanchang University2. College of Materials Science and Engineering, Nanchang University

摘 要：Multi-color luminescence basing on amorphous Eu³⁺/Tb³⁺ co-doped Zn-Al hydroxides and their annealed samples were studied in detail. Results suggest that excellent red emissions due to Eu³⁺ and green emissions attributed to Tb³⁺ appear under the excitation of favorable wavelength for all the asprepared amorphous samples. Moreover, the emission intensity depends on the Eu³⁺/Tb³⁺ molar ratio. The samples annealed at 300, 500, and 700 ℃ still exhibit amorphous state,and multi-color luminescence kept in the samples annealed at 300 ℃, while luminescence quenched for the samples annealed at 500 and 700 ℃. However, a broad emission ranging from 450 to 650 nm occurs in some samples annealed at 900 ℃. Further, the fluorescence decay and lifetimes for the as-prepared samples and the samples annealed at 300 ℃ were investigated. It is found that all the decay curves of emissions due to Tb³⁺ and Eu³⁺ present characteristic double exponential function despite their different lifetimes.The present work may be a good example for developing new multi-color even white light emitting materials.

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