The LED Age On the fifty years of development of light-emitting diodes up to the current lighting-technology revolution

Abstract

Light emitting diodes (LED) form the basis of the current fundamental changes of the lighting technology and usage. The paper summarizes technical principles and the historical evolution of lighting devices based on electroluminescence and photoluminescence.

Keywords

• light-emitting diode
• electroluminescence
• photoluminescence
• phosphor
• lighting technique