Light–matter interaction in hybrid systems made of fluorophores embedded into a microcavity (MC) attracts much attention. Depending on the coupling strength between the components, either photoluminescence (PL) enhancement or hybridization of the luminophore energy levels with the MC eigenmode resulting in two hybrid energy states occurs in these systems. This effect can be used in various practical applications: enhancing Raman scattering, increasing conductivity, obtaining Bose–Einstein condensates at room temperature, etc. Hybrid structures emitting in the near-infrared (NIR) range can be used in biomedical applications for exciting and detecting radiation within the transparency window of biological tissues. Here, we have developed hybrid photoluminescent structures based on porous silicon photonic crystals (PhCs) and PbS quantum dots (QDs) emitting in the NIR range. The freestanding PhC-based MCs were obtained by electrochemical etching of monocrystalline Si. Comparison of the PhC reflectance spectra before and after exfoliation from the substrate, as well as after thermal oxidation, showed a 100-nm blue shift, other parameters being almost unchanged. After embedding QDs, we observed narrowing of their PL spectrum compared to the QD solution. We attribute this to the Purcell effect and weak coupling between the QD exciton and MC eigenmode. Thus, our hybrid structures exhibit weak light–matter coupling in the NIR range, which provides the basis for new nanophotonic biosensor systems. In addition, they are freestanding, thus offering prospects for designing sensors with the option of pumping analytes through the porous structure.

由嵌入微腔 (MC) 中的荧光团制成的混合系统中的光-物质相互作用引起了很多关注。根据组件之间的耦合强度，这些系统中会发生光致发光 (PL) 增强或发光团能级与 MC 本征模式的混合，从而产生两种混合能态。这种效应可用于各种实际应用：增强拉曼散射、增加电导率、在室温下获得玻色-爱因斯坦凝聚等。 在近红外 (NIR) 范围内发射的混合结构可用于生物医学应用中的激发和检测生物组织透明窗内的辐射。这里，我们开发了基于在 NIR 范围内发射的多孔硅光子晶体 (PhC) 和 PbS 量子点 (QD) 的混合光致发光结构。独立式 PhC 基 MCs 是通过电化学蚀刻单晶 Si 获得的。从基材剥离前后以及热氧化后的 PhC 反射光谱的比较显示 100 nm 蓝移，其他参数几乎不变。嵌入 QD 后，我们观察到与 QD 解决方案相比，它们的 PL 光谱变窄。我们将此归因于珀塞尔效应以及 QD 激子和 MC 本征模式之间的弱耦合。因此，我们的混合结构在 NIR 范围内表现出弱光-物质耦合，这为新的纳米光子生物传感器系统提供了基础。此外，它们是独立的，