Dual-Mode Long-Lived Luminescence of Mn2+-Doped Nanoparticles for Multilevel Anticounterfeiting
Dual-Mode Long-Lived Luminescence of Mn2+-Doped Nanoparticles for Multilevel Anticounterfeiting
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用于多级防伪的Mn2掺杂纳米颗粒双模长寿命发光
DOI：
10.1021/acsami.9b09612
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发表时间：
2019-08-21
影响因子：
9.5
通讯作者：
Geng, Baoyou
中科院分区：
文献类型：
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作者：
Liu, Xiaowang;Ji, Qiang;Geng, Baoyou
具有双模式长寿命发光特性的发光纳米粒子在生物传感、生物成像和数据编码等领域具有重要的应用价值。在此，我们报告的实现上转换和下转换发射的Mn 2+掺杂剂在多层纳米NaGdF 4：Yb/Tm@NaGdF4：Ce/Mn@NaYF4在980和254 nm激发时，分别。由于Mn 2+在3d（5）组态内的自旋禁戒光学跃迁，Mn 2+掺杂剂在531 nm处的双模发射具有高达近似30 ms的长寿命。在两个波长处停止稳定激发之后，Mn 2+发光的长寿命特征允许比镧系元素发射更长的持续时间，从而使得能够在突发模式下通过手机相机容易地进行数据解码。长寿命的绿色上转换发射还允许在980 nm处动态激发时产生长的绿色尾发射。这些属性使得所制备的Mn 2+掺杂的多层纳米颗粒对于多层防伪特别有吸引力。
Luminescent nanoparticles with dual-mode long-lived luminescence are of great importance for their attractive applications in biosensing, bioimaging, and data encoding. Herein, we report the realization of up- and downconversion emission of Mn2+ dopants in multilayer nanoparticles of NaGdF4:Yb/Tm@NaGdF4:Ce/Mn@NaYF4 upon excitation at 980 and 254 nm, respectively. The dual-mode emission of the Mn2+ dopants at 531 nm have a long-lived lifetime up to similar to 30 ms as a result of the spin-forbidden optical transition of Mn2+ within the 3d(5) configuration. After ceasing steady excitation at the two wavelengths, the long-lived feature of Mn2+ luminescence allows a longer persistent time than lanthanide emissions, thereby enabling the ease of data decoding by a cell phone camera under a burst mode. The long-lived green upconversion emission also permits the generation of a long green tail emission upon dynamic excitation at 980 nm. These attributes make the as-prepared Mn2+-doped multilayer nanoparticles particularly attractive for multilevel anticounterfeiting.