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Radiation sensitivity of light emitting diodes (LED), laser diodes (LD) and photodiodes (PD)

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4 Author(s)
Lischka, H. ; Fraunhofer-INT, Euskirchen, Germany ; Henschel, H. ; Lennartz, W. ; Schmidt, H.U.

Commercially available diodes were irradiated at a flash X-ray source, a 60Co gamma ray source, and a 14-MeV neutron generator. During irradiation at the 60Co source, the light output of the LEDs and LDs was measured continuously. From time to time their emission spectrum was also observed. With the PDs the authors measured the preamplifier output during 60Co irradiation as well as dark current noise before and after irradiation. Determination of the sensitivity against neutrons was made offline. After pulsed irradiation of PDs the authors measured how long a certain type of preamplifier was overdriven by the induced photocurrent. LEDs and LDs showed a maximum decrease of output power of only 0.5 dB up to a total gamma dose of 106 Gy or neutron fluences of 4×1013 cm-2 (1 MeV), respectively. Irradiations of PDs with 60Co gammas up to a total dose of 106 Gy as well as irradiations with neutrons up to fluences of ⩽4×1013 cm-2 (1 MeV) lead to significant changes of the device parameters. The main effect is a strong increase of the dark current by factors of two up to 5000

Published in:

Nuclear Science, IEEE Transactions on  (Volume:39 ,  Issue: 3 )

Date of Publication:

Jun 1992

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