Abstract Fe:Co:ZnSe nanocrystals with different co-doping ratios of Fe2+/Co2+ ions were fabricated by hydrothermal synthesis. The facile method used in the present work avoids the mid-infrared quench effect induced by the organic molecular introduced in the past preparation process. These nanocrystals are spherical in shape and exhibit a cubic sphalerite structure with an average grain size of about 15 nm. Through the energy conversion between Co2+ and Fe2+ ions, mid-infrared fluorescences at 3.3 μm and 4.4 μm were detected under 1550 nm laser excitation at room temperature. The fluorescence band of 4.4 μm in the Fe:Co:ZnSe nanocrystals is thought to be an overlapping emission involving the peak centered at 4648 nm corresponding to the Co2+:4T1 (F) → 4T2 (F) energy transition and the peak centered at 4273 nm corresponding to Fe2+:5T2 (D) → 5E (D) energy transition. These high-quality optically active nanomaterials show potential applications in mid-infrared devices such as composite fiber-amplifiers and lasers materials.

中文翻译：

---

钴铁共掺杂 ZnSe 纳米晶：室温下的中红外发光

摘要 采用水热合成法制备了不同Fe2+/Co2+离子共掺杂比的Fe:Co:ZnSe纳米晶。本工作中使用的简便方法避免了过去制备过程中引入的有机分子引起的中红外猝灭效应。这些纳米晶体呈球形，呈立方闪锌矿结构，平均晶粒尺寸约为 15 nm。通过 Co2+ 和 Fe2+ 离子之间的能量转换，在室温下 1550 nm 激光激发下检测到 3.3 μm 和 4.4 μm 的中红外荧光。Fe:Co:ZnSe 纳米晶体中 4.4 μm 的荧光带被认为是重叠发射，涉及以 4648 nm 为中心的峰值对应于 Co2+:4T1 (F) → 4T2 (F) 能量跃迁和以 4273 为中心的峰值nm 对应于 Fe2+：5T2 (D) → 5E (D) 能量转换。这些高质量的光学活性纳米材料在复合光纤放大器和激光材料等中红外器件中显示出潜在的应用。