Green phosphors are materials that emit green light when excited by energy sources like ultraviolet light or electron beams. They are commonly used in various applications, including LEDs, fluorescent lamps, and television screens, to enhance brightness and color quality. These phosphors typically contain compounds such as zinc sulfide or yttrium aluminum garnet doped with elements like terbium or europium. Their ability to convert energy into visible light makes them essential in modern display technologies and lighting solutions, contributing to energy efficiency and improved visual experiences.