| Abstract: | Electroluminescence(EL) and temperature-dependent photoluminescence measurements are performed to study the internal quantum efficiency droop phenomenon of blue laser diodes(LDs) before lasing. Based on the ABC mode, the EL result demonstrates that non-radiative recombination rates of LDs with threshold current densities of 4 and 6 kA/cm~2 are similar, while LD with threshold current density of 4 kA/cm~2 exhibits a smaller augerlike recombination rate compared with the one of 6 kA/cm~2. The internal quantum efficiency droop is more serious for LD with higher threshold current density. The internal quantum efficiency value estimated from temperature-dependent photoluminescence is consistent with EL measurements. |
