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Electroluminescence (EL) is an optical phenomenon and electrical phenomenon in which a material emits light in response to the passage of an electric current or to a strong electric field. This is distinct from black body light emission resulting from heat (incandescence), from a chemical reaction (chemiluminescence), sound (sonoluminescence), or other mechanical action (mechanoluminescence). This […]

The costs of solar energy are plummeting, and now are about on par with the electricity generated at big power plants. This new reality intensifies a long-running business and regulatory battle, between the mainline electric utility companies and newer firms that provide solar systems for homeowners’ rooftops. Sometimes rivalry looks more like hardball politics than […]