In recent decades, luminescent nanomaterials have generated interests in the scientific community due to their unique properties, which are different from those of their bulk counterparts, and their use in a wide variety of applications. Today, luminescent nanomaterials are used in various applications such as displays, solid state lighting, solar cells, long afterglow, dosimetry, theft prevention, medical imaging, phototherapy, and quantum/gas sensing. This book presents cutting-edge research topics from experts in the field of synthesis and characterization of luminescent nanomaterials and their potential applications. It covers interesting topics in semiconductor physics, photochemistry, physical chemistry, materials science, and luminescence. The book will appeal to beginners and advanced researchers interested in this field.