serves as a powerful instrument that explores cutting-edge research knowledge on the topic of upconverting nanosystems, while simultaneously providing the necessary fundamental background for nonspecialist readers. The various aspects of upconverting materials are approached both from a theoretical point of view, particularly upconverting phenomenon, and a practical one. By presenting synthetic strategies, functionalization, production of core shell structures and nanocomposites, this book supplies PhD students, researchers, and scientists with a wealth of ideas they can apply to different fields of research. Thirty-five renowned scientists from around the world have collaborated to produce 11 chapters that help to "make a voyage" through the most important aspects of UPNPs, including syntheses, mechanism, functionalization, and applications.