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//Example 7.1
//Program to determine the total carrier recombination lifetime and
//the power internally generated within the device
clear;
clc ;
close ;
//Given data
Tau_r=60; //ns - RADIATIVE RECOMBINATION LIFETIME
Tau_nr=100; //ns - NON RADIATIVE RECOMBINATION LIFETIME
Lambda=0.87*10^-6; //metres - PEAK EMISSION WAVELENGTH
c= 2.998*10^8; //m/s - SPEED OF LIGHT
h= 6.626*10^(-34); //J/K - PLANK's CONSTANT
e=1.602*10^(-19); //Coulumbs - CHARGE OF AN ELECTRON
i=40*10^(-3); //A - DRIVE CURRENT
//Total carrier recombination lifetime
Tau=Tau_r*Tau_nr/(Tau_r+Tau_nr);
//Internal quantum efficiency
eeta_int=Tau/Tau_r;
//Power internally generated within the device
P_int=eeta_int*h*c*i/(Lambda*e);
//Displaying the Results in Command Window
printf("\n\n\t Total carrier recombination lifetime is %0.1f ns.",Tau);
printf("\n\n\t Power internally generated within the device is %0.1f mW .",P_int/10^(-3));
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