Nd3+-Sensitized Ho3+ Single-Band Red Upconversion Luminescence in Core鈥揝hell Nanoarchitecture

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• 作者：Daqin Chen ; Lu Liu ; Ping Huang ; Mingye Ding ; Jiasong Zhong ; Zhenguo Ji
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：July 16, 2015
• 年：2015
• 卷：6
• 期：14
• 页码：2833-2840
• 全文大小：522K
• ISSN：1948-7185

文摘

A strategy to achieve 808 nm excited single-band red upconversion luminescence of Ho³⁺ via the core鈥搒hell nanoarchitecture design was provided. Specifically, the synthesized Yb/Ho/Ce: NaGdF₄@Yb/Nd: NaYF₄ active-core@active-shell nanoparticles were evidenced to enable high-content doping of Nd³⁺ (鈭?0 mol %) in the shell layer and, thus, markedly enhance red upconversion emission from Ho³⁺ activators in the core with the assistance of spatially confined doping of Nd³⁺ ions and efficient energy transfer of Nd³⁺ 鈫?Yb³⁺(shell) 鈫?Yb³⁺(core) 鈫?Ho³⁺. Importantly, introducing Ce³⁺ into the core was beneficial to the competition of radiation transitions from the two intermediate excited states of Ho³⁺: ⁵S₂,⁵F₄ (green-emitting) and Ho³⁺: ⁵F₅ (red-emitting), which induced great enhancement in the red to green intensity ratio and ultimately intense single-band red upconversion emission. We believe that this preliminary study will provide an important advance in developing luminescent markers suitable for biolabeling applications.