期刊
ADVANCED MATERIALS
卷 33, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202008722
关键词
bismuth doping; calcium stannate; energy traps; nanoparticles; persistent luminescence; phosphors
类别
资金
- National Natural Science Foundation of China [51602063, 81771891, 51972065]
- Guangdong Natural Science Foundation [2017B030306003, 2019A030310444]
- Science and Technology Program of Guangzhou [201804010257]
- Guangdong High-level personnel of special support program
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology)
- University of Massachusetts
A new type of persistent luminescence phosphors and nanoparticles that can be charged via deep-tissue penetrable near-infrared (NIR) light for regenerating light emission signals have been reported. These materials enable the reverse transition of carriers, allowing for circular charging using low-energy NIR photons and emitting afterglow signals, setting the stage for new biological applications.
Persistent-luminescence phosphors (PLPs) have a wide variety of applications in the fields of photonics and biophotonics due to their ultralong afterglow lifetime. However, the existing PLPs are charged and recharged with short-wavelength high-energy photons or inconvenient and potentially risky X-ray beams. To date, deep tissue penetrable NIR light has mainly been used for photostimulated afterglow emission, which continues to decay and weaken after each cycle, Herein, a new paradigm of trap energy upconversion-like near-infrared (NIR) to near-infrared light rejuvenateable persistent luminescence in bismuth-doped calcium stannate phosphors and nanoparticles is reported. In contrast to the existing PLPs and persistent-luminescence nanoparticles, the materials enable the occurrence of a reversed transition of the carriers from a deep-level energy trap to a shallow-level trap upon excitation by low-energy NIR photons. Thus these new materials can be charged circularly via deep-tissue penetrable NIR photons, which is unable to be done for existing PLPs, and emit afterglow signals. This conceptual work will lay the foundation to design new categories of NIR-absorptive-NIR-emissive PLPs and nanoparticles featuring physically harmless and deep tissue penetrable NIR light renewability and sets the stage for numerous biological applications, which have been limited by current materials.
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