Gu Simin, Lian Huiwang, Kuang Rongyi, Lou Bibo, Ma Chonggeng, Liu Gaochao, Wang Jing
Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry, Sun Yat-sen University, Guangzhou, 510006, China.
School of Optoelectronic Engineering & CQUPT-BUL Innovation Institute, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China.
Light Sci Appl. 2025 Sep 11;14(1):317. doi: 10.1038/s41377-025-01953-4.
Laser-driven near-infrared II (NIR-II) light sources comprising luminescent ceramics represent a promising research frontier, yet their development remains constrained by the external quantum efficiency (EQE) and thermal stability bottleneck of current luminescent materials. Herein, we present a non-equivalent cation substitution strategy to fabricate high-efficiency translucent MgO:Ni, Cr NIR-II luminescent ceramics. The co-doping of Cr induces structural distortion at Ni-occupied octahedral sites, effectively breaking the parity-forbidden d-d transition constraint while enabling efficient energy transfer from Cr to Ni. These synergistic effects yield remarkable internal and external quantum efficiencies of 61.06% and 39.69%, respectively. The developed ceramic demonstrates exceptional thermal management capabilities with 31.28 W·m·K thermal conductivity and 92.11% emission retention at 478 K. When integrated into laser-driven NIR-II light sources, the system achieves record-breaking performance of 214 mW output power under 21.43 W/mm blue laser excitation. Practical demonstrations showcase superior non-destructive imaging capabilities with 5.29 lp/mm spatial resolution and 0.97 contrast ratio. This work establishes a new paradigm for developing high-performance NIR-II light sources in advanced imaging and detection technologies.
由发光陶瓷构成的激光驱动近红外二区（NIR-II）光源代表了一个充满前景的研究前沿领域，然而其发展仍受到当前发光材料的外量子效率（EQE）和热稳定性瓶颈的限制。在此，我们提出一种非等效阳离子取代策略来制备高效半透明MgO:Ni, Cr NIR-II发光陶瓷。Cr的共掺杂在Ni占据的八面体位置诱导结构畸变，有效打破宇称禁戒d-d跃迁限制，同时实现从Cr到Ni的高效能量转移。这些协同效应分别产生了显著的内量子效率和外量子效率，分别为61.06%和39.69%。所制备的陶瓷表现出卓越的热管理能力，热导率为31.28 W·m·K，在478 K时发射保留率为92.11%。当集成到激光驱动的NIR-II光源中时，该系统在21.43 W/mm蓝色激光激发下实现了破纪录的214 mW输出功率性能。实际演示展示了具有5.29 lp/mm空间分辨率和0.97对比度的卓越无损成像能力。这项工作为在先进成像和检测技术中开发高性能NIR-II光源建立了新的范例。
