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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LED features
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