Modern Luminescence: From Fundamental Concepts to Materials and Applications, Volume One, Concepts and Luminescence is a multivolume work that reviews the fundamental principles, properties and applications of luminescent materials. Topics addressed include key concepts of luminescence, with a focus on important characterization techniques to understand a wide category of luminescent materials. The most relevant luminescent materials, such as transition metals, rare-earth materials, actinide-based materials, and organic materials are discussed, along with emerging applications of luminescent materials in biomedicine, solid state devices, and the development of hybrid materials. This book is an important introduction to the underlying scientific concepts needed to understand luminescence, such as atomic and molecular physics and chemistry. Other topics explored cover the latest advances in materials characterization methods, such as Raman spectroscopy, ultrafast spectroscopy, nonlinear spectroscopy, and more. Finally, there is a focus on the materials physics of nanophotonics.