An Excitation Navigating Energy Migration of Lanthanide Ions in Upconversion Nanoparticles.,Advanced Materials

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An Excitation Navigating Energy Migration of Lanthanide Ions in Upconversion Nanoparticles.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-01-21 , DOI: 10.1002/adma.201906225
Zhendong Lei _{1,

2} , Xiao Ling ₃ , Qingsong Mei ₃ , Shuai Fu ₄ , Jing Zhang ₄ , Yong Zhang _{1,

2,

4}

Affiliation

Upconversion nanoparticles (UCNPs) doped with lanthanide ions that possess ladder-like energy levels can give out multiple emissions at specific ultra-violet or visible wavelengths irrespective of excitation light. However, precisely controlling energy migration processes between different energy levels of the same lanthanide ion to generate switchable emissions remains elusive. Herein, a novel dumbbell-shaped UCNP is reported with upconverted red emission switched to green emission when excitation wavelength changed from 980 to 808 nm. The sensitizer Yb ions are doped with activator Er ions and energy modulator Mn ions in NaYF4 core nanocrystal coated with an inner NaYF4 :Yb shell to generate red emission after harvesting 980 nm excitation light, while an outer NaNdF4 :Yb shell is coated to form a dumbbell shape to generate green emission upon 808 nm excitation. Such specially designed UCNPs with switchable green and red emissions are further explored for imaging of latent fingerprint and detection of explosive residues in the fingerprint simultaneously. This work suggests a novel research interest in fine-tuning of upconversion emissions through precisely controlling energy migration processes of the same lanthanide activator ion. Furthermore, use of these nanoparticles in other applications such as simultaneous dual-color imaging or orthogonal bidirectional photoactivation can be explored.

中文翻译：

在上转换纳米粒子中激发镧系元素离子的能量迁移的激发。

掺杂有梯形能级的镧系离子的上转换纳米粒子（UCNP）可以在特定的紫外线或可见光波长下发出多种发射，而与激发光无关。然而，精确地控制相同镧系元素离子的不同能级之间的能量迁移过程以产生可转换的排放仍然是遥不可及的。在本文中，报道了一种新颖的哑铃形UCNP，当激发波长从980 nm更改为808 nm时，其上转换的红色发射转换为绿色发射。敏化剂Yb离子在涂有内部NaYF4：Yb壳的NaYF4核纳米晶体中掺杂有活化剂Er离子和能量调节剂Mn离子，在收获980 nm激发光后产生红色发射，而外部NaNdF4：b壳被涂覆以形成哑铃形状，以在808nm激发时产生绿色发射。进一步探索了具有可切换的绿色和红色发射的这种特殊设计的UCNP，以对潜在指纹成像并同时检测指纹中的爆炸性残留物。这项工作表明了一种新的研究兴趣，即通过精确控制同一镧系元素活化剂离子的能量迁移过程来微调上转换发射。此外，可以探索这些纳米颗粒在其他应用中的应用，例如同时双色成像或正交双向光活化。这项工作表明了一种新的研究兴趣，即通过精确控制同一镧系元素活化剂离子的能量迁移过程来微调上转换发射。此外，可以探索这些纳米颗粒在其他应用中的应用，例如同时双色成像或正交双向光活化。这项工作表明了一种新的研究兴趣，即通过精确控制同一镧系元素活化剂离子的能量迁移过程来微调上转换发射。此外，可以探索这些纳米颗粒在其他应用中的应用，例如同时双色成像或正交双向光活化。

更新日期：2020-03-03

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