The researchers are working on all these possibilities. Also some windows turning a dimming color woulc cut air coditioning costs--mostly southward facing windows. But ohers, like northly facng window would benefit from just haresting UV. I think all these are possible with different sized quantum dots,
I wonder about the user experience with a quantum dot charger window. What color would the window appear to be? [What wavelengths of light would be reduced and what wavelengths of light would be enhanced?] Could the system be engineered to work with UV light which we wouldn't miss?
@Ogemaniac: Thank you for raising those points. I agree with what you have said. But my thought came while I was driving to office...for outdoor application. It takes about one hour for travelling to office and mostly in India, we get abundant sunlight in almost all seasons. I did not think about indoor application and I agree that display will have to be brighter, which would consume more power...but there could be a solution thought out. I like your idea of putting it on the back side!
There are two big problems with combing a phone display with a solar cell.
1: Standard office light is ~1000 times weaker than full sunshine. Our eyes are actually amazing in that they can handle nearly 10 orders of magnitudes of photon intensity.
2: The solar cell will block outgoing light as well, implying that you'd have to crank up the power on the display in order to achieve the same brightness.
These two issues combined make it almost impossible to make an energy profit with a display-side solar cell. The back side is feasible, but you'd have to leave the phone face down. I do that anyway for privacy reasons.
the novely of the idea is to engineer the quantum dots so that they remit absorbed solar light for PV panels. If the costs can be brought down and such panels can be installed in the window pans then it will bring down the electricity costs and scarcity by some level.
While visiting one of the North Eastern states of India where Buddhism is prominant, I bought a toy that has a wheel similar to the one you find in Budhist monastries , which are turned by hand by the devotees.
The toy wheel I bought has a small array of solar panels . I have kept it on the dashboard of my car . whenever sunlight falls on it while driving, the wheel starts rotating by the energy harvested by the solar panels.
I think this idea can be expanded to develop a solar energy harvestor for in car mobile charging.