Outside Front Cover: Tailoring Photonic Transport in Cluster‐Assembled Crystals via Atomic‐Level Coordination Engineering

In the Research Article e8418370, Yan Kuai, Xi Kang, Manzhou Zhu, and co-workers demonstrate that four key parameters—enhanced photoluminescence intensity, extended photoluminescence lifetime, optimized refractive index, and increased polarization degree—significantly contribute to the development of cluster-based optical waveguide materials with low optical loss coefficients and high transmission efficiency.