This book is a reference for researchers working in the field of phosphors. The central focus of this book is the luminescence studies of strontium sulphide based powder, thin film and nano phosphors for display applications. The first part of the book is a review of literature covering the basics of electroluminescent phosphors, ac thin film electroluminescent (ACTFEL) device operation, and experimental techniques for preparation and characterization of the samples discussed in this work. The second part covers the synthesis of some strontium sulphide based phosphors and their structural, optical and electrical characterization. Fabrication of an SrS:Cu,F ACTFEL device is also discussed.