Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou, 215009, China.
Key Laboratory of Advanced Functional Materials of Nanjing, Nanjing Xiaozhuang University, Nanjing 211171, China.
Phys Chem Chem Phys. 2021 Oct 13;23(39):22476-22482. doi: 10.1039/d1cp03155d.
Biological probes with integrated photoluminescence and magnetism characteristics play a critical role in modern clinical diagnosis and surgical protocols combining fluorescence optical imaging (FOI) with magnetic resonance imaging (MRI) technology. However, traditional magnetic semiconductors can easily generate a spin splitting at the Fermi level and half-metallic electronic occupation, which will sharply reduce the radiation recombination efficiency of photogenerated carriers. To overcome this intrinsic contradiction, we propose a controllable oxidation strategy to introduce some particular PO bonds into black phosphorus nanosheets, in which the p orbital hybridization between P and O atoms not only provides some carrier recombination centers but also leads to a room-temperature spin polarization. As a result, the coexistence of photoluminescence and magnetism is realized in multifunctional black phosphorus probes with excellent biocompatibility. This work provides a new insight into integrating photoluminescence and magnetism together by intriguing atomic orbital hybridization.
具有集成光致发光和磁学特性的生物探针在现代临床诊断中起着关键作用，它结合了荧光光学成像（FOI）和磁共振成像（MRI）技术。然而，传统的磁性半导体很容易在费米能级处产生自旋劈裂和半金属电子占据，这将急剧降低光生载流子的辐射复合效率。为了克服这一内在矛盾，我们提出了一种可控氧化策略，将一些特殊的 P—O 键引入黑磷纳米片中，其中 P 和 O 原子之间的 p 轨道杂化不仅提供了一些载流子复合中心，而且导致室温自旋极化。因此，多功能黑磷探针中同时实现了光致发光和磁性，且具有优异的生物相容性。这项工作通过激发原子轨道杂化，为集成光致发光和磁性提供了新的思路。
