Your correct that the QD Vision IP wasn't cadmium free, but Samsung has been cadmium free since 2015 when they showed their first model at CES. They continue to be cadmium free.

2015
http://mashable.com/2015/01/05/samsung-suhd-t...RUlQm5.aqA

Recent monitor release
http://www.highdefdigest.com/news/show/Samsun...itor/37599