Simplify the following text for a Grade 12 native English-speaking person.
Original: 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 .
Simplified: Electroluminescence ( EL ) is an optical and electrical event in which a material emits light in response to an electric current passed through it , or to a strong electric field .