Citric Acid-Assisted Hydrothermal Synthesis of Luminescent TbPO4:Eu Nanocrystals: Controlled Morphology and Tunable Emission

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• 作者：Weihua Di ; Marc-Georg Willinger ; Rute A. S. Ferreira ; Xinguang Ren ; Shaozhe Lu ; Nicola Pinna
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：December 4, 2008
• 年：2008
• 卷：112
• 期：48
• 页码：18815-18820
• 全文大小：288K
• 年卷期：v.112,no.48(December 4, 2008)
• ISSN：1932-7455

文摘

This work reports a simple hydrothermal route using citric acid as a “shape modifier” for the controlled synthesis of luminescent TbPO₄:Eu nanocrystals. The size and morphology of products change remarkably when the proportion of citric acid involved in the reaction increases. The multiple roles that citric acid plays during the controlled synthesis are discussed to try to understand the crystallization and growth dynamics of TbPO₄ crystals. The photoluminescence properties of TbPO₄:Eu are investigated. The excitation spectra and the variation of the ⁵D₄ lifetime values as a function of the Eu³⁺ concentration points out the occurrence of Tb³⁺-to-Eu³⁺ energy transfer, resulting in a maximum absolute emission quantum yield of 0.14. The possibility to tune the size, the shape, and the optical properties of the nanocrystals reported in this work might be useful for applications in optoelectronics or biolabeling. Moreover, this simple approach might also be applied for the synthesis of other luminescent phosphates.