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+// Example 6.2//internal power level
+clc;
+clear;
+close;
+e=1.6*10^-19;//Electronic charge
+ht=6.62*10^-34;//Constt
+C=3*10^8;//speed light in m/s
+h=0.87*10^-6;//wavelength in meter
+tr=80;//radiative recombination time in nano second
+tnr=120;//non radiative recombination time in nano second
+t=(tr*tnr)/(tr+tnr);//Bulk recombination life time in nano second
+nint= (t/tr)
+i=40;//injected current in milli ampere
+Pint= (nint*((ht*C*i*10^-3)/(e*h)))*10^3;//internal power level in milli Watt
+disp(Pint,"internal power level in milli Watt")