Light management is of paramount importance to improve the performance of optoelectronic devices including photodetectors, optical sensors, solar cells, and light‐emitting diodes. Photonic crystals are shown as an effective metamaterial for trapping light among their various photon management functions. Herewith, it is demonstrated that spherical photonic crystals, or in other words, photonic beads, possess a stronger light‐trapping effect compared to the planar counterpart. The photonic beads are fabricated by colloidal self‐assembly under microdroplet confinement employing microfluidic devices. The light–matter interactions are illustrated by the emission intensity and lifetime of the embedded emitters, namely carbon dots and upconversion nanoparticles (UCNPs). The bandgaps of the photonic beads are selected according to the emission and excitation peaks of the light emitters, whereby the emission or excitation peak overlaps the blue edge or red edge of the photonic bands, respectively. Significantly stronger emission and extended luminescence lifetime are observed in photonic beads ensemble in comparison to the planar photonic crystals, demonstrating enhanced light trapping owing to the spherical geometry, which introduces additional microcavity effect. Photonic beads represent a perfect hierarchical light manipulation system. Combining both photonic and microcavity resonator effects, photonic beads potentially find applications in light harvesting, sensing, lighting devices, and light‐triggered manipulations.

中文翻译：

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光子珠的集合：光学特性和增强的光-物质相互作用

光线管理对于提高光电设备（包括光电探测器，光学传感器，太阳能电池和发光二极管）的性能至关重要。光子晶体被显示为一种有效的超材料，用于在其各种光子管理功能之间捕获光。据此证明，与平面对应物相比，球形光子晶体（即光子珠）具有更强的陷光效果。光子珠是通过使用微流控设备在微滴限制下通过胶体自组装来制造的。嵌入式发射器（即碳点和上转换纳米粒子（UCNPs））的发射强度和寿命说明了光与物质的相互作用。根据光发射器的发射和激发峰来选择光子珠的带隙，由此，发射或激发峰分别与光子带的蓝色边缘或红色边缘重叠。与平面光子晶体相比，在光子珠子集合体中观察到明显更强的发射和更长的发光寿命，这表明由于球形几何形状而增强了光捕获，这引入了附加的微腔效应。光子珠代表了一种完美的分层光操纵系统。结合光子和微腔谐振器的影响，光子珠可能会在光收集，传感，照明设备和光触发操作中找到应用。由此，发射或激发峰分别与光子带的蓝色边缘或红色边缘重叠。与平面光子晶体相比，在光子珠子集合体中观察到明显更强的发射和更长的发光寿命，这表明由于球形几何形状而增强了光捕获，这引入了附加的微腔效应。光子珠代表了一种完美的分层光操纵系统。结合光子和微腔谐振器的影响，光子珠可能会在光收集，传感，照明设备和光触发操作中找到应用。由此，发射或激发峰分别与光子带的蓝色边缘或红色边缘重叠。与平面光子晶体相比，在光子珠子集合体中观察到明显更强的发射和更长的发光寿命，这表明由于球形几何形状而增强了光捕获，这引入了附加的微腔效应。光子珠代表了一种完美的分层光操纵系统。结合光子和微腔谐振器的影响，光子珠可能会在光收集，传感，照明设备和光触发操作中找到应用。展示了由于球形几何形状而增强的光陷阱，从而引入了额外的微腔效应。光子珠代表了一种完美的分层光操纵系统。结合光子和微腔谐振器的影响，光子珠可能会在光收集，传感，照明设备和光触发操作中找到应用。展示了由于球形几何形状而增强的光陷阱，从而引入了额外的微腔效应。光子珠代表了一种完美的分层光操纵系统。结合光子和微腔谐振器的影响，光子珠可能会在光收集，传感，照明设备和光触发操作中找到应用。