Which of the following statements about LED is INCORRECT?

Light Emitting Diode (LED):

• A Light Emitting Diode (LED) is a semiconductor unit that emits light when an electrical current flows through it.
• Light is produced when the particles that carry the charge (known as electrons and holes) combine together within the semiconductor material. 
• It uses materials like gallium and arsenide.
• Since light is generated within the solid semiconductor material, LEDs are described as solid-state devices.
• LEDs are utilized in applications as diverse as aviation lighting, automotive headlamps, advertising, general lighting, traffic signals, camera flashes, lighted wallpaper, horticultural grow lights, and medical devices.​
• It needs small power for operation.