Laser-driven near-infraredⅡ(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 st...Laser-driven near-infraredⅡ(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^(2+),Cr^(3+)NIR-Ⅱluminescent ceramics.The co-doping of Cr^(3+)induces structural distortion at Ni^(2+)-occupied octahedral sites,effectively breaking the parity-forbidden d-d transition constraint while enabling efficient energy transfer from Cr^(3+)to Ni^(2+).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^(−1)·K^(−1)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^(2)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.展开更多
基金financially supported by the Joint Funds of the National Natural Science Foundation of China and Chongqing(U24A2056)the National Key R&D Program of China(2023YFB3506600 and 2023YFB3506602)the University Key Laboratory of Guangdong(2024KSYS021).
文摘Laser-driven near-infraredⅡ(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^(2+),Cr^(3+)NIR-Ⅱluminescent ceramics.The co-doping of Cr^(3+)induces structural distortion at Ni^(2+)-occupied octahedral sites,effectively breaking the parity-forbidden d-d transition constraint while enabling efficient energy transfer from Cr^(3+)to Ni^(2+).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^(−1)·K^(−1)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^(2)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.
