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Core‐Shell Upconverting Nanocrystals
This cover shows that critical information regarding the interface of core‐shell upconverting nanocrystals can be revealed (cracked sphere in the foreground) by implementing complementary STEM‐based methods with atomic‐scale resolution (inclined plane in the background). Depending on the shell growth conditions, core‐shell upconverting nanocrystals are characterized...
Advances in controlling energy migration pathways in core‐shell lanthanide (Ln)‐based hetero‐nanocrystals (HNCs) have relied heavily on assumptions about how optically active centers are distributed within individual HNCs. In this article, it is demonstrated that different types of interface patterns can be formed depending on shell growth conditions. Such interface patterns are not only identified...
In the past few decades, significant progress of the conventional upconversion nanoparticles (UCNPs) based nanoplatform has been achieved in many fields, and with the development of nanoscience and nanotechnology, more and more complex situations need a UCNPs based nanoplatform having multifunctions for specific multimodal or multiplexed applications. Through self‐assembly, different UCNPs or UCNPs...
Luminescent Janus nanoparticles refer to a special category of Janus‐based nanomaterials that not only exhibit dual‐asymmetric surface nature but also attractive optical properties. The introduction of luminescence has endowed conventional Janus nanoparticles with many alluring light‐responsive functionalities and broadens their applications in imaging, sensing, nanomotors, photo‐based therapy, etc...
The spatial distribution and concentration of lanthanide activator and sensitizer dopant ions are of key importance for the luminescence color and efficiency of upconverting nanoparticles (UCNPs). Quantifying dopant ion distributions and intermixing, and correlating them with synthesis methods require suitable analytical techniques. Here, X‐ray photoelectron spectroscopy depth‐profiling with tender...
Near‐infrared (NIR) light is highly suitable for studying biological systems due to its minimal scattering and lack of background fluorescence excitation, resulting in high signal‐to‐noise ratios. By combining NIR light with lanthanide‐based upconversion nanoparticles (UCNPs), upconversion is used to generate UV or visible light within tissue. This remarkable property has gained significant research...