Good question, but I'm 99.9999% sure no. They may us Circularly Polarized light (I actually don't know), but if they do it's made by filtration of unpolarized light rather than polarized electroluminescence. When I was researching the topic (~2008-ish), Spin-LEDs were largely still in the lab - a lot of work at Stanford spintronics lab as I recall. At that time, they were able to achieve a strong bias of circularly polarized light. I just googled it and apparently there's beed good progress in 'purifying' the polarization handedness [1]. If you can harness CP emission, it opens the door for many very interesting applications. CP light is fascinating.

1. https://www.spiedigitallibrary.org/conference-proceedings-of...