Effects of Neutron Radiation on Resonant Cavity Light-Emitting Diodes.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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Resonant Cavity Light Emitting Diodes RCLEDs were irradiated in Ohio State Universitys nuclear reactor to determine the effects of Neutron displacement damage. The RCLEDs were characterized both before and after irradiation by their current versus voltage curves I-V curves and external light power versus current curves L-I curves. The I-V curves showed an increase in the knee voltage at a neutron fluence of l.45xl0exp 17 neutronscm2. Logarithmic decreases in external light power and differential quantum efficiency were observed. Significant decreases in external light power were observed at neutron fluences greater than 5.1xl0exp 13 neutronscm2. Equations were developed to predict the changes in external light power at a given bias current and the differential quantum efficiency for neutron fluences between 10exp 10 neutronscm2 to 10exp 18 neutronscm2. The damage constants for these equations were derived from the irradiation data. Finally, there was no significant changes in the RCLED output spectral distribution at neutron fluences up to 3xl0exp 15 neutronscm2.
- Radioactivity, Radioactive Wastes and Fission Products