Laser-driven luminescent ceramic-converted near-infrared II light source for advanced imaging and detection...

Area of Science:

• Materials Science
• Optoelectronics
• Ceramics

Background:

• Laser-driven near-infrared II (NIR-II) light sources are crucial for advanced imaging.
• Current luminescent materials face limitations in external quantum efficiency (EQE) and thermal stability.

Purpose of the Study:

• To develop high-efficiency and thermally stable NIR-II luminescent ceramics.
• To overcome the bottlenecks hindering the performance of current NIR-II light sources.

Main Methods:

• Fabrication of translucent MgO:Ni²⁺, Cr³⁺ ceramics using a non-equivalent cation substitution strategy.
• Co-doping with Cr³⁺ to induce structural distortion and enable efficient energy transfer to Ni²⁺.

Main Results:

• Achieved remarkable internal and external quantum efficiencies of 61.06% and 39.69%, respectively.
• Demonstrated excellent thermal conductivity (31.28 W·m^-1·K^-1) and emission retention (92.11% at 478 K).
• Developed NIR-II light sources with record output power (214 mW) and superior imaging capabilities (5.29 lp/mm spatial resolution).

Conclusions:

• The developed MgO:Ni²⁺, Cr³⁺ ceramics represent a significant advancement for high-performance NIR-II light sources.
• This work establishes a new paradigm for high-efficiency luminescent materials in advanced imaging and detection.