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Article | REF: E6501 V1

Lighting Systems based on LEDs LED components

Authors: Georges ZISSIS, Laurent CANALE

Publication date: November 10, 2019, Review date: April 12, 2021

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4. LED features

This section describes some of the characteristics of LEDs: conversion efficiency, color and lifetime.

4.1 Component efficiency

The energy efficiency η e of an LED is a complex quantity and the result of several factors:

  • η f , the internal efficiency, which is the ratio of the average energy of the photon produced (equal to hν) to the total energy that the electron-hole pair acquires from the external energy source (equal to eV) ;

  • η ext , the external quantum efficiency, which is the ratio of the number of photons emitted to the number of electrons...

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