Highly Enhanced and Switchable Photoluminescence Properties in Pillared Layered Hydroxides Stabilizing Ce3+

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• 作者：Jinghua Wu ; Jianbo Liang ; Renzhi Ma ; Takayoshi Sasaki
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：November 19, 2015
• 年：2015
• 卷：119
• 期：46
• 页码：26229-26236
• 全文大小：502K
• ISSN：1932-7455

文摘

We have developed pillared layered rare earth hydroxides showing the reversible photoluminescence switching via reducing鈥搊xidizing processes. An air-stable Ce³⁺-based host, Ce₂(OH)₄SO₄路2H₂O, was successfully synthesized via a homogeneous alkalization protocol to precipitate Ce³⁺ ions from a solution of the relevant salt. Structural analysis revealed that the compound consists of cationic layers of {[Ce(OH)₂(H₂O)]⁺}_{鈭?/sub>, linked by sulfate bidentate ligands to construct a layered framework architecture. Tb³⁺ ion was incorporated into this host lattice to form a solid solution across the full compositional range. At an optimized doping of 鈭?0%, the characteristic green emission was enhanced by 鈭?0 times, being promoted by the efficient energy transfer from Ce³⁺ to Tb³⁺. The emission could be drastically diminished upon the action of the KMnO4 oxidizing reagent, which induced the transformation of Ce³⁺ to Ce⁴⁺. Characterizations by X-ray diffraction and X-ray photoelectron spectroscopy showed that the oxidation of Ce³⁺ occurs without degradation of the crystalline framework. The emission could be recovered to its original intensity by the reduction treatment with ascorbic acid. This photoluminescence switching behavior was detectable by the eye and exhibited high reversibility.}