Quantum light sources, especially single-photon emitters, are crucial for advancing quantum technologies. Despite extensive research, the behavior of defect-localized excitons in monolayer WSe₂ under external perturbations, such as magnetic fields, remain underexplored. This study investigates the nature and dynamics of defect-localized excitons under in-plane magnetic fields using steady-state and time-resolved photoluminescence (PL) spectroscopy. Observations reveal a sharp PL peak, indicative of single-photon emission, with doublet peaks from hybridized spin-state excitons. Notably, magnetic brightening of the PL peak was detected at a low magnetic field (<1 tesla), and the dynamics of hybridized-state excitons under magnetic fields indicated field-induced state mixing, explaining the magnetic brightening. These findings advance tunable single-photon emitters controlled by magnetic fields, with implications for quantum optics applications.

量子光源，特别是单光子发射器，对于推进量子技术至关重要。尽管进行了广泛的研究，但单层WSe₂中缺陷局域激子在外加扰动（如磁场）下的行为仍然研究不足。本研究利用稳态和时间分辨光致发光（PL）光谱学，在面内磁场的作用下探讨了缺陷局域激子的性质和动力学。观察发现，存在一个尖锐的PL峰，表明单光子发射，并且双峰来自于自旋态杂化的激子。值得注意的是，在低磁场（<1特斯拉）时检测到PL峰增强，而磁场所引起的杂化态激子的动力学表明了场诱导的状态混合，解释了PL峰增强的现象。这些发现推动了由磁场控制的可调单光子发射器的发展，并对量子光学应用具有重要意义。