In the visible, essentially all silicon photodiodes have quantum efficiencies of either 90% (coated) or 60% (uncoated). The exceptions are mainly diodes in coloured packages, e.g. with blue filters for light meters or 800-nm longpass filters for IR remote controls. You're basically comparing areas here.
Cheers,
Phil Hobbs
I have data sheets for two PIN photodiodes. I would like to compare their sensitivities. One of them is specified in mw/cm^2 and the other is in lux.
I have tried to find a way to convert one to another, but it seems that the mw/cm^2 is radiometry terms and lux is a photometry term involving weighting due to the response of the human eye. I'm at a loss.
Here are the relevant data points (I think):
Diode 1 Vishay BPV22NF
Diode 2 Sharp PD481PI
Any help comparing the relative sensitivities will be greatly appreciated.
Thanks, John
My comment is that it is pretty piss poor that a data sheet for a photo diode does not provide the active area. I bought some of these a while back and noticed this lapse. Someday, I will dissolve the plastic off and measure one.
Hi, Phil -
Both are in plastic IR filter packages. The BPV22NF area is given as 7.5 mm^2 but the PD481PI is not given.
Thanks for your comments.
John
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