The contribution of 3D nanoscale indium fluctuations into the efficiency droop in the green and blue InGaN/GaN LEDs

Abstract

It was shown that the contribution of 3D nanoscale indium fluctuations into the efficiency droop at j < 50 A/cm2 can be very high and results in different shapes of the efficiency dependency on current η(j) in blue and green LEDs. Reducing 3D nanoscale indium fluctuations can decrease the efficiency droop in these LEDs. The contribution of delocalized carriers is predominant at j > 50 A/cm2 and the current dependences of efficiency, approximated by as η (j) α j-b where 0.2 < b < 0.3, are alike in both green and blue LEDs.