Figure 2
From: Physics of Efficiency Droop in GaN:Eu Light-Emitting Diodes

Effect of Shockley-Hall-Read constant A on the (a) current injection efficiency (ηinjection) and (b) excited Eu+3 ion concentration of the GaN:Eu active region.
From: Physics of Efficiency Droop in GaN:Eu Light-Emitting Diodes

Effect of Shockley-Hall-Read constant A on the (a) current injection efficiency (ηinjection) and (b) excited Eu+3 ion concentration of the GaN:Eu active region.