Mn<sup>4+</sup>-Activated Double-Perovskite-Type Sr<sub>2</sub>LuNbO<sub>6</sub> Multifunctional Phosphor for Optical Probing and Lighting
Zhanglin Chen, Songmo Du, Kaiming Zhu, Zhaobo Tian, Jie Zhang, Fei Li, Shijia Zhang, Shuo Zhao, Wei Cui, Xuanyi Yuan, Kexin Chen, Guoliang Yuan, Guanghua Liu
Abstract
Multifunctional phosphors have significant application and scientific value and are becoming a research hotspot in the field of luminescent materials. Herein, we report Mn 4+ -activated double-perovskite-type Sr 2 LuNbO 6 multifunctional phosphors with excellent comprehensive properties in the fields of optical temperature/pressure sensing and w-LED lighting. The crystalline structure, elemental composition, optimal doping concentration, crystal-field strength, and optical bandgap of the phosphors are investigated in detail, and the mechanisms of concentration and thermal quenching are discussed. From the optimal Sr 2 LuNb 0.998 O 6:0.2%Mn 4+ phosphor, a LED lamp for indoor warm-white lighting is successfully fabricated. Further, the thermometric properties of the phosphors are explored for applications as FIR- and lifetime-based thermometers, showing a maximum relative sensitivity of 1.55% K –1 at 519 K. Upon pressure loading, a significant red-shift of the peak centroid is observed, and the pressure sensitivity is determined to be 0.82 nm/GPa. These results suggest that the Mn 4+ -activated Sr 2 LuNbO 6 multifunctional phosphors have great potential to be utilized in the fields of optical thermometry, manometry, and lighting.