Authors
Yi Wei, Yuxin Yang, Wei Wang, Hang Yang, Fuyan Su, Jinxuan Sun, Guogang Li
Published in
Inorganic chemistry. Volume 65. Issue 43. Pages 25546-25556. Nov 02, 2026.
Abstract
Near-infrared II light (NIR-II, 1000-1700 nm) is highly desirable for deep-tissue bioimaging, nondestructive testing, and night vision, but it remains challenging to realize simultaneously tunable emission peak and bandwidth within a single-activator system. Ni2+ with a 3d8 configuration is a promising broadband NIR-II activator ion whose emission originates from crystal-field-dependent d-d electron transitions. Nevertheless, the currently reported Ni2+-activated phosphors are largely limited with spectral tunability (full width at half-maximum, fwhm <200 nm). Herein, a series of SrGa12O19:Ni2+ phosphors with NIR-II emission are prepared that exhibit an emission peak at 1180 nm originating from the 3T2g → 3A2g electron transition. Through designing Al3+-Ga3+ cation substitution strategy, the local coordination environment and crystal-field strength around Ni2+ are controllably modulated, driving a progressive redshift of the emission peak from 1180 to 1350 nm and a pronounced fwhm broadening from 222 to 566 nm, ultimately affording an ultrabroadband NIR-II emission. Furthermore, a prototype phosphor-converted light-emitting diode (LED) is fabricated, demonstrating promising applications in night vision. This crystal-field engineering strategy substantially extends the tunable range of the emission peak and fwhm for Ni2+-activated phosphors and provides guidelines for optimizing transition-metal-activated NIR luminescent materials.
PMID:
42969536
Bibliographic data and abstract were imported from PubMed on 02 Nov 2026.
Read full publication at:
Please sign in
to see all details.
Advertisement
Stats
- Recommendations n/a n/a positive of 0 vote(s)
- Views 2
- Comments 0