Accession Number : ADA303220

Title :   Effects of Neutron Radiation on Resonant Cavity Light-Emitting Diodes.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Hinkel, Daniel S.

PDF Url : ADA303220

Report Date : DEC 1995

Pagination or Media Count : 72

Abstract : Resonant Cavity Light Emitting Diodes (RCLEDs) were irradiated in Ohio State University's 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.45xl0(exp 17) neutrons/cm2. 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 5.1xl0(exp 13) neutrons/cm2. 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 10(exp 10) neutrons/cm2 to 10(exp 18) neutrons/cm2. 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 3xl0(exp 15) neutrons/cm2.

Descriptors :   *QUANTUM EFFICIENCY, *LIGHT EMITTING DIODES, *RADIATION DAMAGE, DISPLACEMENT, THESES, VOLTAGE, CAVITIES, RESONANCE, SPECTRAL ENERGY DISTRIBUTION, BIAS, NEUTRON IRRADIATION, NEUTRON BEAMS.

Subject Categories : Radioactiv, Radioactive Wastes & Fission Prod

Distribution Statement : APPROVED FOR PUBLIC RELEASE