Photodiodes vs LEDs: Gallium Arsenide Sensitivity

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jamesjd
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Would a gallium arsenide photodiode be sensitive to light from a gallium phopsphide LED?
 
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Probably :
You can make GaP LEDs in green->red
GaAs photodiodes certainly work in the visible (used as solar cells) don't know their response curve and it's probably sensitive to the thickness and structure of the diode.
 

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