Updated: Feb 5
Perovsktie QDs are excellent. They are intrinsically tolerant of defects meaning that one can grow them at relatively low temperature and still the resultant defects and disorders do not strong affect the optical bandgap and, as such, the emission FWHM remains very narrow. In fact the emission full width half maximum is generally narrower than leading the lead Cd based QDs.
In general, green PeQDs are more common now. They offer excellent absorption, meaning that they can even be used in color filters. Most, however, are using them in enhacement mode films. The set up, as described by Nanolumi, is shown below.
Note that enhacement mode is already commercially common and Nanosys is the leading material supplier.
The purpose, as also shown below, is to improve the color gamut by having a narrow FWHM and lower amount of color mixing
The reason for this short blog entry however was not to highligh the progress with green perovskites. There are multiple firms reporting the same and now the key efforts are in improving light flux and thermal stability, driving down barrier requirements, and also setting up a large-scale production chain including film coating.
The reason was however to show the below chart. It is showing a red perovskite QDs within black matrix sample. This is interesting because red is famously unstable to the point that few even dare publish results.
Now, Nanolumi showed the results below in May 2020 but as far as I know they did not publish the stability data which is king. However, they must have felt confident enough to showcase it? well, they will be speaking at our event on 14-15 April so you can grill them (www.TechBlick.com)