Introduction Hybrids with Emission Properties Solid-State Dye-Laser Hybrid Materials Electroluminescent Hybrid Materials Optical Properties of Lanthanide Doped Hybrid Materials Encapsulation of Nano-Phosphors inside Hybrid Matrices One-pot Synthesis of Rare-Earth Doped Hybrid Matrices Rare-earth Doped Hybrids made via Non-hydrolytic Processes Energy Transfer Processes between Lanthanides and Organic Dyes Hybrid with Absorption Properties: Photochromic Hybrid Materials Photochromic Hybrids for Optical Data Storage Photochromic Hybrids for Fast Optical Switches Non-Siloxane-Based Hosts for the Design of New Photochromic Hybrid Materials Nonlinear Optics Second-Order Nonlinear Optics in Hybrid Materials Hybrid Photorefractive Materials Photochemical Hole Burning in Hybrid Materials Optical Limiters Hybrid Optical Sensors Integrated Optics Based on Hybrid Material Hierarchically Organized Hybrid Materials for Optical Applications Conclusions and Perspectives