Highly Enhanced Cooperative Upconversion Luminescence through Energy Transfer Optimization and Quenching Protection

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• 作者：Meng Xue ; Xingjun Zhu ; Xiaochen Qiu ; Yuyang Gu ; Wei Feng ; Fuyou Li
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 20, 2016
• 年：2016
• 卷：8
• 期：28
• 页码：17894-17901
• 全文大小：606K
• 年卷期：0
• ISSN：1944-8252

文摘

Upconversion luminescence nanomaterials have shown great potential in biological and physical applications because of their unique properties. However, limited research exists on the cooperative sensitization upconversion emission in Tb³⁺ ions over Er³⁺ ions and Tm³⁺ ions because of its low efficiency. Herein, by optimizing the doping ratio of sensitizer and activator to maximize the utilization of the photon energy and introducing the CaF₂ inert shell to shield sensitizer from quenchers, we synthesize ultrasmall NaYbF₄:Tb@CaF₂ nanoparticles with a significant enhancement (690-fold) in cooperative sensitization upconversion emission intensity, compared with the parent NaYbF₄:Tb. The lifetime of Tb³⁺ emission in NaYbF₄:Tb@CaF₂ nanoparticles is prolonged extensively to ∼3.5 ms. Furthermore, NaYbF₄:Tb@CaF₂ was applied in in vitro and in vivo bioimaging. The presented luminescence enhancement strategy provides cooperative sensitization upconversion with new opportunities for bioapplication.