School of Physics and Materials Engineering, Dalian Minzu University, 18 Liaohe West Road, Dalian, 116600, China.
School of Chemistry and Environment, Beijing University of Aeronautics & Astronautics, 37 Xueyuan Road, Beijing, 100191, China.
Nat Commun. 2022 Nov 1;13(1):6549. doi: 10.1038/s41467-022-34350-1.
The second near-infrared (NIR II) response photon up-conversion (UC) materials show great application prospects in the fields of biology and optical communication. However, it is still an enormous challenge to obtain efficient NIR II response materials. Herein, we develop a series of Er doped ternary sulfides phosphors with highly efficient UC emissions under 1532 nm irradiation. β-NaYS:Er achieves a visible UC efficiency as high as 2.6%, along with high brightness, spectral stability of lights illumination and temperature. Such efficient UC is dominated by excited state absorption, accompanied by the advantage of long lifetimes (I, 9.24 ms; I, 30.27 ms) of excited state levels of Er, instead of the well-recognized energy transfer UC between sensitizer and activator. NaYS:Er phosphors are further developed for high-performance underwater communication and narrowband NIR photodetectors. Our findings suggest a novel approach for developing NIR II response UC materials, and simulate new applications, eg., simultaneous NIR and visible optical communication.
近红外二区（NIR II）响应的上转换（UC）材料在生物学和光通信领域具有广阔的应用前景。然而，获得高效的 NIR II 响应材料仍然是一个巨大的挑战。在此，我们开发了一系列高效的 NIR II 响应的 Er 掺杂三元硫化物荧光粉，在 1532nm 辐照下具有高效的 UC 发射。β-NaYS:Er 实现了高达 2.6%的可见 UC 效率，同时具有高光亮度、光照明和温度稳定性。这种高效的 UC 主要由激发态吸收主导，同时具有 Er 激发态能级长寿命（I，9.24ms；I，30.27ms）的优势，而不是公认的敏化剂和激活剂之间的能量转移 UC。NaYS:Er 荧光粉进一步开发用于高性能水下通信和窄带近红外光电探测器。我们的研究结果为开发 NIR II 响应 UC 材料提供了一种新方法，并模拟了新的应用，例如同时进行近红外和可见光光通信。
