Kinetics of the Destriau Effect.- I. Theory of the Kinetics of the Destriau Effect.- § 1. General Theory.- § 2. Derivation of Formulas for Electroluminescence Efficiency from the Transport Equations.- II. Experimental Investigation of the Kinetics of the Destriau Effect.- § 1. Investigation of the Dependence of the Electroluminescence Efficiency on the Voltage.- § 2. Influence of the Activator Concentration and of a Second “Phase” on the Energy Absorption and the Electroluminescence Brightness.- Conclusions.- Literature Cited.- Electroluminescence and Other Optical and Electrical Characteristics of p-n Junctions in Zinc Sulfide.- I. Some Properties of p-n Junctions.- § 1. Current-Voltage Characteristics in Darkness.- § 2. Electroluminescence.- § 3. Photo-emf.- § 4. Fabrication of p-n Junctions.- II. Electrical and Optical Properties of Zinc Sulfide.- § 1. Electrical Properties.- § 2. Photoconductivity and Luminescence.- III. Fabrication and Investigation of p-n Junctions.- § 1. Fabrication of p-n Junctions.- § 2. Methods Used in Investigations of p-n Junctions in ZnS.- IV. Optical and Electrical Properties of p-n Junctions in ZnS.- § 1. Current-Voltage Characteristics and Photo-emf.- § 2. Electroluminescence of p-n Junctions in ZnS.- § 3. Comparison of Some Characteristics of p-n Junctions in ZnS with the Characteristics of ZnS:Cu2S Heterojunctions.- Conclusions.- Literature Cited.- Electroluminescence and Some Electrical Properties of Homogeneous Zinc Sulfide Single Crystals.- I. Review of Published Literature.- § 1. Optical and Electrical Properties of Zinc Sulfide.- § 2. Electroluminescence of Zinc Sulfide.- II. Experimental Method.- § 1. Preparation of Samples.- § 2. Apparatus.- III. Results of Measurements and Discussion.- § 1. Electrical Conductivity.- § 2. Visible Electroluminescence.- § 3. Ultraviolet Electroluminescence.- Conclusions.- Literature Cited.- Temperature Dependence of the Brightness of the Radiation Emitted by Electroluminescent Capacitors.- Method.- Experimental Results.- Literature Cited.- Principles of Conversion of Electrical Energy into Light.- § 1. Thermal Light Sources.- § 2. Luminescent Light Sources..- Conclusions.- Literature Cited.