Let us know if this works for you. I fiddled with the idea myself almost ten years ago. Before any of the commercialized stuff became readily available and you had to build your own transformers.
If I recall, the AT&T technology was really interesting but the sheets were pretty brittle. They behaved more like thin sheets of metal. You can bend and cut them so much before they crack and break.
The material from AGFA was far more interesting. It was immune to infinite bending (as long as the plastic did not break). You could either cut it to shape or "etch" patterns onto the material with a chemical solution or household bleach. But the resistence for the AGFA material was into the MegaOhms. I couldn't get any of the sheets to light up no matter what I did to it.
I even handed samples of both the AT&T and AGFA sheets along with the datasheets to a resident electrical engineeer who tried without success. The problem at the time was that the datasheets were loaded with obscure information making it difficult to interpret exactly what kind of circuit was needed to power the sheets.
Whatever the power requirements was, the examples cited included wrist watches, cell phones and HUD's.
I gave up eventually and put the sheet samples I had left away.

I think a third capacitor type was developed but it was after I stopped researching.