Screen producing potentials when light falls on it

[Wrichik Basu]

Suppose there is a screen. This screen has been divided into a very large number of pixels. Each pixel has a material, that has the capability of producing a potential difference when light falls on it. The potential difference for different wavelengths should be different. Say, over a range of 5nm, the potential may be the same, but different for another range. For example, for light of λ = 400nm to 405nm, a certain potential is produced, but for 406nm to 410nm, a different potential is produced (the range may actually be larger, it doesn't matter till the colours can be differentiated by recording the potentials). Each pixel will get excited for any light of wavelength in the visible region, and then automatically restore back to the original condition.

Has such a material been invented? I have an idea, and for that, I need something like this. I need to know if this has already been invented.

 

[Borek]

This is more of a physics question than chemistry.

I can be missing something here but light/electricity conversion works through the https://en.wikipedia.org/wiki/Photoelectric_effect and it doesn't behave the way you ask for.

 

[Wrichik Basu]

This is more of a physics question than chemistry.

True, but since I'm asking for some material, I decided to put it in chemistry forum.

I can be missing something here but light/electricity conversion works through the https://en.wikipedia.org/wiki/Photoelectric_effect and it doesn't behave the way you ask for.

I know about photoelectric effect, but the way I'm trying to use it, it's difficult to use any metal. I'm doing something related to biological application, and I can't use a metal there.

 

[Borek]

While photoelectric effect was first described for metals, same principles hold for other materials as well.