Temperature Dependent Optical Properties of PbS/Cd
Post# of 22456
....appears to have been published/studied a bit
https://www.google.com/?gws_rd=ssl#q=Temperat...Phys.+Chem.
Tuning light emission of PbS nanocrystals from infrared to visible range by cation exchange
http://iopscience.iop.org/article/10.1088/146...055007/pdf