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Electroluminescence (EL) and temperature-dependent photoluminescence measurements are performed to study the inteal 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 6kA/cm2 are similar,while LD with threshold current density of 4kA/cm2 exhibits a smaller augerlike recombination rate compared with the one of 6kA/cm2.The inteal quantum efficiency droop is more serious for LD with higher threshold current density.The inteal quantum efficiency value estimated from temperature-dependent photoluminescence is consistent with EL measurements.