Towards highly efficient NIR II response up-conversion phosphor enabled by long lifetimes of Er<sup>3</sup>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36319657.
- Also identified by DOI 10.1038/s41467-022-34350-1 and PMC identifier 9626601.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The second near-infrared (NIR II) response photon up-conversion (UC) materials show great application prospects in the fields of biology and optical communication. However, it is still an enormous challenge to obtain efficient NIR II response materials. Herein, we develop a series of Er<sup>3+</sup> doped ternary sulfides phosphors with highly efficient UC emissions under 1532 nm irradiation. β-NaYS<sub>2</sub>:Er<sup>3+</sup> achieves a visible UC efficiency as high as 2.6%, along with high brightness, spectral stability of lights illumination and temperature. Such efficient UC is dominated by excited state absorption, accompanied by the advantage of long lifetimes (<sup>4</sup>I<sub>9/2</sub>, 9.24 ms; <sup>4</sup>I<sub>13/2</sub>, 30.27 ms) of excited state levels of Er<sup>3+</sup>, instead of the well-recognized energy transfer UC between sensitizer and activator. NaYS<sub>2</sub>:Er<sup>3+</sup> phosphors are further developed for high-performance underwater communication and narrowband NIR photodetectors. Our findings suggest a novel approach for developing NIR II response UC materials, and simulate new applications, eg., simultaneous NIR and visible optical communication.
Medical subject headings
- Energy Transfer