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Optical micrograph of the LED die. The central circular contact is the -metal while the surrounding area is the -metal.
Variation of forward turn-on voltage in LEDs as a function of measurement time after various -ray doses. Turn-on voltage is defined as the voltage at which the forward current is . The data for the unirradiated diodes are from a total of 15 die whose data are overlapped, for the samples there were 6 die and for the samples there were 18 die.
Emission spectra from LEDs as a function of -ray doses. The forward voltage was held constant at during the measurement.
Variation of reverse breakdown voltage in 410, 440, 465, and LEDs as a function of -ray dose.
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