Are safety and environmental factors being consideration here? Putting thin films of some mercury compound into consumer electronics doesn't sound great, and is probably already banned by regulations like RoHS.
This is, morbidly, from crematorium emissions. Now imagine if that was the output of every electronics section of the local recycling centre/dumps.
The problem is if a particular material becomes the golden goose and companies won't avoid it if there is a perceived/real advantage.