کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5458630 | 1516173 | 2017 | 7 صفحه PDF | دانلود رایگان |
- A strategy to achieve 808Â nm excited single-band red UC emission has been provided.
- Nd3+/Yb3+/Er3+ tri-doped KMnF3 nanocrystals are synthesized by solvothermal method.
- The corresponding energy transfer mechanism have been discussed in detail.
- A new type of UCNPs is developed as attractive alternative for deep-tissue imaging.
A new type of upconversion nanoparticles (UCNPs) whose excitation and emission peaks are both located in the biological window has been developed based on the combination of Nd3+ sensitization and efficient energy transfer between Mn2+ and Er3+ ions. In our design, Nd3+ ions act as sensitizers for efficient absorption of 808Â nm NIR photons, while the usage of Yb3+ ions as energy migrators facilitates the efficient energy transfer from Nd3+ to Er3+ ions. More importantly, the introduction of Mn2+ ions plays a key role in the realization of single-band red UC emission of Er3+ ions via the efficient energy transfer process between Mn2+ and Er3+. Consequently, upon 808Â nm laser excitation, single-band red UC emission can be obtained in the as-synthesized Nd3+/Yb3+/Er3+ tri-doped KMnF3 nanocrystals, which could be considered as attractive alternative to conventionally used UCNPs for deep-tissue imaging with mitigation of the attenuation effect associated with the emission peaks outside biological window and the overheating constraints imposed by the conventional 980Â nm laser excitation.
Journal: Journal of Alloys and Compounds - Volume 721, 15 October 2017, Pages 531-537