Fundamental theoretical aspects of luminescence

M. N. Sapozhnikov, Vladimir I. Alekseev

V. Hizhnyakov, Karl K. Rebane, Imbi Tehver

U. Kh. Kopvillem, V. R. Nagibarov

V. V. Antonov‐Romanovskii

Shuwu Xu, Huajie Chen, Lingxiao Wang +1 more

Magnetic field-modulated luminescence in lanthanide-doped nanomaterials offers crucial insights for advancing magneto-optical technologies, yet the fundamental mechanisms governing luminescence are still not fully understood. Here, we report Zeeman-effect-induced luminescence suppression in Er3+-doped GdF3 nanoparticles under dual-wavelength excitation (808 nm broadband and 527 nm narrowband) at moderate magnetic fields (up to 1.3 T). Under 808 nm excitation, upconversion emissions (528, 546, and 656 nm) dominated by two-photon absorption exhibit >79% intensity suppression (0.89 T), attributed to energy mismatch caused by Zeeman splitting of sublevels. In contrast, under 527 nm excitation, downconversion emissions (656, 842, and 983 nm) show uniform suppression (∼66% at 1.3 T) due to magnetic field-induced splitting of the 2H11/2 energy level. A simplified model elucidates how Zeeman splitting alters absorption resonance, with theoretical calculations aligning closely with experimental trends. This study reveals the physical mechanisms of magnetic field modulation using dual-wavelength excitation, providing a foundation for expanding magneto-optical technologies in imaging and sensing applications.

Masaaki Ashida, Koichi Okamoto, Takuya Matsuda +1 more

Ultrafast luminescence represents a frontier in optical materials science, bridging fundamental investigations of light–matter interaction and the development of next‐generation photonic devices. Enhancing the speed of luminescence has long been a central objective, with continued relevance in both fundamental and applied contexts. In advanced photonic systems, rapid light emission enables the realization of extremely bright and temporally precise optical signals. This capability is crucial for quantum information technologies, where single‐photon sources with short radiative lifetimes are essential, as well as for classical high‐speed optical communication and sensing platforms. This review highlights recent progress in accelerating the emission process by leveraging cooperative emission effects, resonator‐enhanced coupling, and nonlocal or multipolar interactions, incorporating the authors’ original contributions and perspectives. These advances have led to the realization of novel coherent and incoherent bright light sources, high‐efficiency single‐photon emitters, radiative processes robust against thermal dephasing, and photon generation from materials typically regarded as nonluminescent due to thermal relaxation or self‐trapping. These mechanisms from both theoretical and experimental perspectives are explored, and insights into their integration for future photonic architectures are offered.