Failure analysis on reflector blackening between lead frame electrodes in LEDs under WHTOL test
We report a new blackening failure mode of commercial LEDs. Delamination and corrosive de-flash agent are the root causes of the failure. Reflector cup corrosion and Ag migration are the features of the failure. The effect of the blackening failure to LED performance is estimated.
failure analysis blackening delamination electromigration led reliability reflector corrosion