Highly Enhanced Cooperative Upconversion Luminescence through Energy Transfer Optimization and Quenching Protection
Highly Enhanced Cooperative Upconversion Luminescence through Energy Transfer Optimization and Quenching Protection
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通过能量传输优化和淬灭保护高度增强协同上转换发光
DOI：
10.1021/acsami.6b05609
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发表时间：
2016
影响因子：
9.5
通讯作者：
Li Fuyou
中科院分区：
文献类型：
--
作者：
Xue Meng;Zhu Xingjun;Qiu Xiaochen;Gu Yuyang;Feng Wei;Li Fuyou
上转换发光纳米材料以其独特的性能在生物和物理领域显示出巨大的应用潜力。然而，由于Tb3+离子对Er3+离子和Tm3+离子的协同敏化上转换发射效率较低，研究较少。本文通过优化敏化剂和激活剂的掺杂比例，最大限度地利用光子能量，并引入caf2惰性壳层来保护敏化剂不受猝灭剂的影响，合成了超小的NaYbF4:Tb@CaF2nanoparticles，与母材NaYbF4:Tb相比，协同敏化上转换发射强度显著增强（690倍）。NaYbF4:Tb@CaF2nanoparticles中Tb3+的发射寿命大大延长至~ 3.5 ms。此外，NaYbF4:Tb@CaF2was应用于体外生物成像。所提出的发光增强策略为协同增敏上转换提供了新的生物应用机会。
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 CaF2inert shell to shield sensitizer from quenchers, we synthesize ultrasmall NaYbF4:Tb@CaF2nanoparticles 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@CaF2nanoparticles is prolonged extensively to ∼3.5 ms. Furthermore, NaYbF4:Tb@CaF2was applied inin vitroandin vivobioimaging. The presented luminescence enhancement strategy provides cooperative sensitization upconversion with new opportunities for bioapplication.