The College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , PR China.
The Key Laboratory of Rare Earth Functional Materials and Applications; Henan Key Laboratory of Rare Earth Functional Materials , Zhoukou Normal University , Zhoukou 466001 , PR China.
Inorg Chem. 2018 Jul 16;57(14):8662-8672. doi: 10.1021/acs.inorgchem.8b01592. Epub 2018 Jun 25.
Highly fluorescent nanomaterials have shown great potential application in optics area. However, further improving their fluorescence properties especially for nanomaterials still remains a challenge. Specifically, luminescence of lanthanide (Ln) ions doped two-dimensional (2D) nanosheets is seldom studied. Herein, MgWO:Ln (Ln = Eu, Tb) nanosheets were successfully synthesized via a simple hydrothermal method, and the luminescence properties of these nanosheets are obviously improved through incorporation of fluorescent carbon dots (CDs) onto the surface of MgWO:Ln (CDs@MgWO:Ln) nanosheets. The obtained MgWO:Ln samples have a 2D nanosheet morphology with triclinic phase, and the morphology and phase structure can be maintained after incorporating CDs onto the nanosheets' surface. Under the excitation of UV light, the obtained MgWO:Ln nanosheets exhibit the characteristic emission of the doping ions, and the emission intensity of CDs@MgWO:Eu and CDs@MgWO:Tb nanosheets increases 2- and 7-fold compared to the corresponding samples without incorporation of CDs, respectively. This luminescent enhancement mechanism might be due to the capturing electrons by CDs and energy transfer from CDs to luminescent Ln. The fluorescence enhancement through incorporation of CDs provides a simple and environment-friendly strategy for further improving luminescence property of other lanthanide ions doped nanomaterials.
高荧光纳米材料在光学领域显示出巨大的潜在应用。然而，进一步提高其荧光性能，特别是对纳米材料，仍然是一个挑战。具体来说，镧系（Ln）离子掺杂二维（2D）纳米片的发光很少被研究。在此，通过简单的水热法成功合成了 MgWO：Ln（Ln=Eu、Tb）纳米片，并通过将荧光碳点（CDs）掺入 MgWO：Ln（CDs@MgWO：Ln）纳米片的表面，明显改善了这些纳米片的发光性能。所得 MgWO：Ln 样品具有具有三斜相的 2D 纳米片形貌，并且在将 CDs 掺入纳米片表面后可以保持形貌和相结构。在紫外光激发下，所得 MgWO：Ln 纳米片表现出掺杂离子的特征发射，并且与未掺入 CDs 的相应样品相比，CDs@MgWO：Eu 和 CDs@MgWO：Tb 纳米片的发射强度分别增加了 2 倍和 7 倍。这种发光增强机制可能是由于 CDs 捕获电子和从 CDs 到发光 Ln 的能量转移。通过掺入 CDs 进行荧光增强为进一步提高其他镧系离子掺杂纳米材料的发光性能提供了一种简单且环保的策略。
