Dramatically Enhanced Luminescence of Layered Terbium Hydroxides as Induced by the Synergistic Effect of Gd3+ and Organic Sensitizers

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• 作者：Liangliang Liu ; Qin Wang ; Cunji Gao ; Hao Chen ; Weisheng Liu ; Yu Tang
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 3, 2014
• 年：2014
• 卷：118
• 期：26
• 页码：14511-14520
• 全文大小：500K
• ISSN：1932-7455

文摘

Host鈥揼uest chemistry allows the engineering of new functional materials with tunable properties. This study focuses on layered terbium hydroxides (NO₃-LTbH) codoped with Gd³⁺ (NO₃-LTbH:Gd), which were prepared using the hydrothermal method and successfully modified using sensitizers (L). Luminescence studies showed that compared with the NO₃-LTbH precursor the sensitizer-modified NO₃-LTbH:Gd exhibited high luminescence intensity and high luminescence quantum efficiency (桅 = 33%). This performance results from the synergistic effect of codoped Gd³⁺ and intercalated sensitizers in the organic鈥搃norganic hybrid materials, which led to stronger luminescence properties, and synergistic effect on the enhancement of Tb³⁺ luminescence was investigated by the spectroscopic characteristics, UV鈥搗is absorption spectrum, low-temperature phosphorescence, and crystal structures of the layered rare-earth hydroxides. Studies demonstrate that the mechanism for synergistic effect of significant enhancement of Tb³⁺ luminescence is mainly caused by Gd³⁺ inducing a cascaded energy transfer from the host to Tb³⁺ via organic sensitizers. The very interesting thing is that LTbH:Gd has multiple roles, including energy-transfer bridges that connect the sensitizers and Tb³⁺ (in host) to enhance the characteristic emission of Tb³⁺, significantly enhancing phosphorescence of sensitizers, and acting as host matrices for sensitizers. Second, the effects of intercalation conditions on luminescence were also investigated. Furthermore, a novel transparency luminescent composite film device [PMMA/L-LTbH:Gd] that exhibits strong luminescence property was also fabricated using the solvent-casting method.