Full text loading...
(a) and (b) characteristics of a blue LED at different dc-stressing stages. The inset of (a) is a top-view image of the measured LED chip.
External quantum efficiency of the aged LED as a function of forward current after different stressing time.
EL spectra of the LED measured at 20 mA after different stressing time.
Peak-efficiency-current and amount of decrease in luminescence efficiency as a function of stressing time.
Article metrics loading...