4. LED features
This section describes some of the characteristics of LEDs: conversion efficiency, color and lifetime.
4.1 Component efficiency
The energy efficiency ηe of an LED is a complex quantity and the result of several factors:
ηf, 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) ;
ηext, the external quantum efficiency, which is the ratio of the number of photons emitted to the number of electrons transiting the diode.
Thus, we can express the energy efficiency ηe as follows:
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LED features
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